refactor: reorganized exports and removed obsolete helper branches

- Removed export leakage by demoting many helper and const symbols to module-local scope.
- Renamed underscore-prefixed internals and cache fields, then updated related references and `satisfies never` checks.
- Deleted obsolete logic branches and helpers, including harmony-stream interruption flow and unused benchmark runtime helpers.
- Updated Biome config and manifests by broadening lint coverage and removing an unused `@napi-rs/cli` dev dependency.
- Adjusted tests and utilities to use renamed test helpers and remove redundant private test-only helpers/locals.

.fallowrc.jsonc

@@ -0,0 +1,29 @@
+{
+	// Fallow configuration — see `bunx fallow config-schema` for the full schema.
+	//
+	// `entry` is critical: fallow's dead-code analyzer treats unlisted test files
+	// as unreachable, which means any helper imported only from other tests looks
+	// orphaned. Without this, `fallow fix` strips real `export` keywords from
+	// shared test utilities (e.g. `e2eApiKey`, `withEnv`, `waitForDelayOrAbort`),
+	// breaking the test build with `noUnusedVariables` lint errors.
+	"entry": [
+		"packages/*/test/**/*.{ts,tsx}",
+		"packages/*/test/**/*.test.{ts,tsx}",
+		"packages/*/bench/**/*.{ts,tsx}",
+		"packages/*/scripts/**/*.ts"
+	],
+	"duplicates": {
+		"ignore": [
+			// Generated from `packages/natives/scripts/native-index.template.js` via gen-enums.ts.
+			"packages/natives/native/index.js",
+			// Generated by `packages/coding-agent/scripts/generate-docs-index.ts`.
+			"packages/coding-agent/src/internal-urls/docs-index.generated.ts",
+			// Embedded HTML asset shipped as a static template, not a code module.
+			"packages/coding-agent/src/export/html/template.js",
+			// Generated/owned upstream — see packages/ai/scripts/generate-models.ts.
+			"packages/ai/src/models.json"
+		],
+		"ignoreImports": true
+	},
+	"rules": {}
+}

biome.json

@@ -7,10 +7,16 @@
 	},
 	"linter": {
 		"enabled": true,
+		"includes": ["**"],
 		"rules": {
 			"recommended": true,
+			"a11y": "off",
 			"correctness": {
 				"noUnusedImports": "error",
+				"noUnusedVariables": {
+					"level": "warn",
+					"fix": "none"
+				},
 				"noVoidTypeReturn": "off"
 			},
 			"style": {

package.json

@@ -131,12 +131,11 @@
   },
   "devDependencies": {
     "@biomejs/biome": "catalog:",
-		"@bufbuild/protoc-gen-es": "catalog:",
+    "prettier": "catalog:",
     "@types/bun": "catalog:",
     "@typescript/native-preview": "catalog:",
     "typescript": "catalog:",
-		"lint-staged": "catalog:",
-		"prettier": "catalog:"
+    "lint-staged": "catalog:"
   },
   "lint-staged": {
     "*.{js,ts,jsx,tsx,json,jsonc,css}": "biome check --write --no-errors-on-unmatched"

packages/agent/src/agent-loop.ts

@@ -14,11 +14,9 @@ import {
 import { sanitizeText } from "@oh-my-pi/pi-natives";
 import {
 	createHarmonyAuditEvent,
-	extractHarmonyRemoved,
 	type HarmonyDetection,
 	type HarmonyRecoveredToolCall,
 	isHarmonyLeakMitigationTarget,
-	recoverHarmonyToolCall,
 	signalListLabel,
 } from "./harmony-leak";
 import type {
@@ -502,26 +500,6 @@ async function streamAssistantResponse(
 
 	const responseIterator = response[Symbol.asyncIterator]();
 
-	const _interruptForHarmonyLeak = (message: AssistantMessage, detection: HarmonyDetection): never => {
-		const recovered = recoverHarmonyToolCall(message, detection);
-		const removed = recovered?.removed ?? extractHarmonyRemoved(message, detection);
-		harmonyAbortController?.abort();
-		responseIterator.return?.()?.catch(() => {});
-		if (recovered) {
-			if (addedPartial) {
-				context.messages[context.messages.length - 1] = recovered.message;
-			} else {
-				context.messages.push(recovered.message);
-				stream.push({ type: "message_start", message: { ...recovered.message } });
-			}
-			stream.push({ type: "message_end", message: recovered.message });
-			throw new HarmonyLeakInterruption(detection, removed, recovered);
-		}
-		if (addedPartial) {
-			context.messages.pop();
-		}
-		throw new HarmonyLeakInterruption(detection, removed);
-	};
 	// Set up a single abort race: register the abort listener once for the whole
 	// stream and reuse the same race promise for every iterator.next() instead of
 	// allocating Promise.withResolvers and add/removeEventListener per event.

packages/agent/src/harmony-leak.ts

@@ -36,7 +36,6 @@ const FENCE_RE = /^\s*(?:```+|~~~+)/;
 const SCRIPT_CLASS =
 	"\u3400-\u4DBF\u4E00-\u9FFF\uF900-\uFAFF\u0400-\u04FF\u0E00-\u0E7F\u10A0-\u10FF\u0530-\u058F\u0C80-\u0CFF\u0C00-\u0C7F\u0900-\u097F\u0600-\u06FF\u0D00-\u0D7F";
 const SCRIPT_RUN_RE = new RegExp(`[${SCRIPT_CLASS}]{2,}`, "u");
-const _SCRIPT_CHAR_RE = new RegExp(`[${SCRIPT_CLASS}]`, "u");
 
 // Recovery registry. Each entry's parser must recognize the configured
 // sentinel (per-tool, see eval/parse.ts and hashline/parser.ts) and surface

packages/agent/test/agent-loop.test.ts

@@ -779,7 +779,7 @@ it("refreshes tools and system prompt between same-turn model calls", async () =
 	};
 
 	const stream = agentLoop([userPrompt], context, config, undefined, streamFn);
-	for await (const _event of stream) {
+	for await (const _ of stream) {
 		// consume
 	}
 

packages/agent/test/helpers.ts

@@ -27,7 +27,7 @@ export function pushAlphaThenDoneEvent(
 	}
 }
 
-export function createUsage(): Usage {
+function createUsage(): Usage {
 	return {
 		input: 0,
 		output: 0,

packages/ai/src/providers/azure-openai-responses.ts

@@ -6,17 +6,15 @@ import type {
 	ResponseInput,
 } from "openai/resources/responses/responses";
 import { getEnvApiKey } from "../stream";
-import {
-	type Api,
-	type AssistantMessage,
-	type Context,
-	type Model,
-	type ServiceTier,
-	type StreamFunction,
-	type StreamOptions,
-	shouldSendServiceTier,
-	type Tool,
-	type ToolChoice,
+import type {
+	AssistantMessage,
+	Context,
+	Model,
+	ServiceTier,
+	StreamFunction,
+	StreamOptions,
+	Tool,
+	ToolChoice,
 } from "../types";
 import { normalizeSystemPrompts } from "../utils";
 import { createAbortSourceTracker } from "../utils/abort";
@@ -33,8 +31,11 @@ import { mapToOpenAIResponsesToolChoice } from "../utils/tool-choice";
 import { normalizeOpenAIResponsesPromptCacheKey, supportsDeveloperRole } from "./openai-responses";
 import {
 	appendResponsesToolResultMessages,
+	applyCommonResponsesSamplingParams,
+	applyResponsesReasoningParams,
 	convertResponsesAssistantMessage,
 	convertResponsesInputContent,
+	createInitialResponsesAssistantMessage,
 	normalizeResponsesToolCallIdForTransform,
 	processResponsesStream,
 } from "./openai-responses-shared";
@@ -101,23 +102,11 @@ export const streamAzureOpenAIResponses: StreamFunction<"azure-openai-responses"
 		let firstTokenTime: number | undefined;
 		const deploymentName = resolveDeploymentName(model, options);
 
-		const output: AssistantMessage = {
-			role: "assistant",
-			content: [],
-			api: "azure-openai-responses" as Api,
-			provider: model.provider,
-			model: model.id,
-			usage: {
-				input: 0,
-				output: 0,
-				cacheRead: 0,
-				cacheWrite: 0,
-				totalTokens: 0,
-				cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
-			},
-			stopReason: "stop",
-			timestamp: Date.now(),
-		};
+		const output: AssistantMessage = createInitialResponsesAssistantMessage(
+			"azure-openai-responses",
+			model.provider,
+			model.id,
+		);
 		let rawRequestDump: RawHttpRequestDump | undefined;
 		const abortTracker = createAbortSourceTracker(options?.signal);
 		const firstEventTimeoutAbortError = new Error(AZURE_OPENAI_RESPONSES_FIRST_EVENT_TIMEOUT_MESSAGE);
@@ -279,31 +268,7 @@ function buildParams(
 		prompt_cache_key: normalizeOpenAIResponsesPromptCacheKey(options?.sessionId),
 	};
 
-	if (options?.maxTokens) {
-		params.max_output_tokens = options?.maxTokens;
-	}
-
-	if (options?.temperature !== undefined) {
-		params.temperature = options?.temperature;
-	}
-	if (options?.topP !== undefined) {
-		params.top_p = options.topP;
-	}
-	if (options?.topK !== undefined) {
-		params.top_k = options.topK;
-	}
-	if (options?.minP !== undefined) {
-		params.min_p = options.minP;
-	}
-	if (options?.presencePenalty !== undefined) {
-		params.presence_penalty = options.presencePenalty;
-	}
-	if (options?.repetitionPenalty !== undefined) {
-		params.repetition_penalty = options.repetitionPenalty;
-	}
-	if (shouldSendServiceTier(options?.serviceTier, model.provider)) {
-		params.service_tier = options.serviceTier;
-	}
+	applyCommonResponsesSamplingParams(params, options, model.provider);
 
 	if (context.tools) {
 		params.tools = convertTools(context.tools);
@@ -312,36 +277,7 @@ function buildParams(
 		}
 	}
 
-	if (model.reasoning) {
-		// Always request encrypted reasoning content so reasoning items can be
-		// replayed in multi-turn conversations when store is false (items aren't
-		// persisted server-side, so we must include the full content).
-		// See: https://github.com/can1357/oh-my-pi/issues/41
-		params.include = ["reasoning.encrypted_content"];
-
-		if (options?.reasoning || options?.reasoningSummary !== undefined) {
-			const reasoningParams: NonNullable<typeof params.reasoning> = {
-				effort: options?.reasoning || "medium",
-			};
-			if (options?.reasoningSummary !== null) {
-				reasoningParams.summary = options?.reasoningSummary || "auto";
-			}
-			params.reasoning = reasoningParams;
-		} else {
-			if (model.name.toLowerCase().startsWith("gpt-5")) {
-				// Jesus Christ, see https://community.openai.com/t/need-reasoning-false-option-for-gpt-5/1351588/7
-				messages.push({
-					role: "developer",
-					content: [
-						{
-							type: "input_text",
-							text: "# Juice: 0 !important",
-						},
-					],
-				});
-			}
-		}
-	}
+	applyResponsesReasoningParams(params, model, options, messages);
 
 	return params;
 }

packages/ai/src/providers/google-gemini-cli.ts

@@ -29,17 +29,22 @@ import { ANTIGRAVITY_SYSTEM_INSTRUCTION, getAntigravityUserAgent, getGeminiCliHe
 import {
 	convertMessages,
 	convertTools,
+	type GoogleThinkingLevel,
 	isThinkingPart,
 	mapStopReasonString,
 	mapToolChoice,
+	nextToolCallId,
+	pushBlockEndEvent,
+	pushToolCallEvents,
 	retainThoughtSignature,
+	startTextOrThinkingBlock,
 } from "./google-shared";
 
 /**
- * Thinking level for Gemini 3 models.
- * Mirrors Google's ThinkingLevel enum values.
+ * Thinking level for Gemini 3 models. Re-exported from `google-shared` so existing
+ * `import { GoogleThinkingLevel } from "./google-gemini-cli"` callers keep working.
  */
-export type GoogleThinkingLevel = "THINKING_LEVEL_UNSPECIFIED" | "MINIMAL" | "LOW" | "MEDIUM" | "HIGH";
+export type { GoogleThinkingLevel };
 
 export interface GoogleGeminiCliOptions extends StreamOptions {
 	toolChoice?: "auto" | "none" | "any";
@@ -72,9 +77,6 @@ export {
 	getGeminiCliUserAgent,
 } from "./google-gemini-headers";
 
-// Counter for generating unique tool call IDs
-let toolCallCounter = 0;
-
 // Retry configuration
 const MAX_RETRIES = 3;
 const BASE_DELAY_MS = 1000;
@@ -426,37 +428,9 @@ export const streamGoogleGeminiCli: StreamFunction<"google-gemini-cli"> = (
 									(!isThinking && currentBlock.type !== "text")
 								) {
 									if (currentBlock) {
-										if (currentBlock.type === "text") {
-											stream.push({
-												type: "text_end",
-												contentIndex: blocks.length - 1,
-												content: currentBlock.text,
-												partial: output,
-											});
-										} else {
-											stream.push({
-												type: "thinking_end",
-												contentIndex: blockIndex(),
-												content: currentBlock.thinking,
-												partial: output,
-											});
-										}
-									}
-									if (isThinking) {
-										currentBlock = { type: "thinking", thinking: "", thinkingSignature: undefined };
-										output.content.push(currentBlock);
-										ensureStarted();
-										stream.push({
-											type: "thinking_start",
-											contentIndex: blockIndex(),
-											partial: output,
-										});
-									} else {
-										currentBlock = { type: "text", text: "" };
-										output.content.push(currentBlock);
-										ensureStarted();
-										stream.push({ type: "text_start", contentIndex: blockIndex(), partial: output });
+										pushBlockEndEvent(currentBlock, blockIndex(), output, stream);
 									}
+									currentBlock = startTextOrThinkingBlock(isThinking, output, stream, ensureStarted);
 								}
 								if (currentBlock.type === "thinking") {
 									currentBlock.thinking += part.text;
@@ -488,30 +462,14 @@ export const streamGoogleGeminiCli: StreamFunction<"google-gemini-cli"> = (
 							if (part.functionCall) {
 								hasContent = true;
 								if (currentBlock) {
-									if (currentBlock.type === "text") {
-										stream.push({
-											type: "text_end",
-											contentIndex: blockIndex(),
-											content: currentBlock.text,
-											partial: output,
-										});
-									} else {
-										stream.push({
-											type: "thinking_end",
-											contentIndex: blockIndex(),
-											content: currentBlock.thinking,
-											partial: output,
-										});
-									}
+									pushBlockEndEvent(currentBlock, blockIndex(), output, stream);
 									currentBlock = null;
 								}
 
 								const providedId = part.functionCall.id;
 								const needsNewId =
 									!providedId || output.content.some(b => b.type === "toolCall" && b.id === providedId);
-								const toolCallId = needsNewId
-									? `${part.functionCall.name}_${Date.now()}_${++toolCallCounter}`
-									: providedId;
+								const toolCallId = needsNewId ? nextToolCallId(part.functionCall.name || "tool") : providedId;
 
 								const toolCall: ToolCall = {
 									type: "toolCall",
@@ -523,19 +481,7 @@ export const streamGoogleGeminiCli: StreamFunction<"google-gemini-cli"> = (
 
 								output.content.push(toolCall);
 								ensureStarted();
-								stream.push({ type: "toolcall_start", contentIndex: blockIndex(), partial: output });
-								stream.push({
-									type: "toolcall_delta",
-									contentIndex: blockIndex(),
-									delta: JSON.stringify(toolCall.arguments),
-									partial: output,
-								});
-								stream.push({
-									type: "toolcall_end",
-									contentIndex: blockIndex(),
-									toolCall,
-									partial: output,
-								});
+								pushToolCallEvents(toolCall, blockIndex(), output, stream);
 							}
 						}
 					}
@@ -572,21 +518,7 @@ export const streamGoogleGeminiCli: StreamFunction<"google-gemini-cli"> = (
 				}
 
 				if (currentBlock) {
-					if (currentBlock.type === "text") {
-						stream.push({
-							type: "text_end",
-							contentIndex: blockIndex(),
-							content: currentBlock.text,
-							partial: output,
-						});
-					} else {
-						stream.push({
-							type: "thinking_end",
-							contentIndex: blockIndex(),
-							content: currentBlock.thinking,
-							partial: output,
-						});
-					}
+					pushBlockEndEvent(currentBlock, blockIndex(), output, stream);
 				}
 
 				return hasContent;

packages/ai/src/providers/google-shared.ts

@@ -1,8 +1,35 @@
 /**
  * Shared utilities for Google Generative AI and Google Cloud Code Assist providers.
  */
-import { type Content, FinishReason, FunctionCallingConfigMode, type Part } from "@google/genai";
-import type { Context, ImageContent, Model, StopReason, TextContent, Tool } from "../types";
+import {
+	type Content,
+	FinishReason,
+	FunctionCallingConfigMode,
+	type GenerateContentConfig,
+	type GenerateContentParameters,
+	type GenerateContentResponse,
+	type GoogleGenAI,
+	type Part,
+	type ThinkingConfig,
+	type ThinkingLevel,
+} from "@google/genai";
+import { calculateCost } from "../models";
+import type {
+	Api,
+	AssistantMessage,
+	Context,
+	ImageContent,
+	Model,
+	StopReason,
+	StreamOptions,
+	TextContent,
+	ThinkingContent,
+	Tool,
+	ToolCall,
+} from "../types";
+import { normalizeSystemPrompts } from "../utils";
+import { AssistantMessageEventStream } from "../utils/event-stream";
+import { finalizeErrorMessage, type RawHttpRequestDump } from "../utils/http-inspector";
 import { prepareSchemaForCCA, sanitizeSchemaForGoogle } from "../utils/schema";
 import { transformMessages } from "./transform-messages";
 import { NON_VISION_IMAGE_PLACEHOLDER } from "./vision-guard";
@@ -11,6 +38,26 @@ export { sanitizeSchemaForGoogle };
 
 type GoogleApiType = "google-generative-ai" | "google-gemini-cli" | "google-vertex";
 
+/**
+ * Thinking level for Gemini 3 models. Mirrors Google's `ThinkingLevel` enum values.
+ * Defined here (not in any specific provider) so all Google providers can reference it
+ * without inducing a circular dependency.
+ */
+export type GoogleThinkingLevel = "THINKING_LEVEL_UNSPECIFIED" | "MINIMAL" | "LOW" | "MEDIUM" | "HIGH";
+
+/**
+ * Sampling/thinking options shared by `streamGoogle` and `streamGoogleVertex`.
+ * `google-gemini-cli` uses a different transport and request shape — do not extend this for it.
+ */
+export interface GoogleSharedStreamOptions extends StreamOptions {
+	toolChoice?: "auto" | "none" | "any";
+	thinking?: {
+		enabled: boolean;
+		budgetTokens?: number;
+		level?: GoogleThinkingLevel;
+	};
+}
+
 /**
  * Determines whether a streamed Gemini `Part` should be treated as "thinking".
  *
@@ -342,8 +389,7 @@ export function mapStopReason(reason: FinishReason): StopReason {
 		case FinishReason.NO_IMAGE:
 			return "error";
 		default: {
-			const _exhaustive: never = reason;
-			throw new Error(`Unhandled stop reason: ${_exhaustive}`);
+			throw new Error(`Unhandled stop reason: ${reason satisfies never}`);
 		}
 	}
 }
@@ -361,3 +407,399 @@ export function mapStopReasonString(reason: string): StopReason {
 			return "error";
 	}
 }
+
+/**
+ * Module-local counter for generating unique tool call IDs across Google providers.
+ * Shared so that a single monotonically-increasing sequence is used regardless of which
+ * Google API surface produced the stream — purely for uniqueness, not ordering semantics.
+ */
+let toolCallCounter = 0;
+
+export function nextToolCallId(name: string): string {
+	return `${name}_${Date.now()}_${++toolCallCounter}`;
+}
+
+/**
+ * Push the appropriate `text_end` / `thinking_end` event for the given block.
+ * Shared between the SDK-backed stream consumer and the gemini-cli SSE consumer so
+ * the end-of-block event shape stays in lockstep.
+ */
+export function pushBlockEndEvent(
+	block: TextContent | ThinkingContent,
+	contentIndex: number,
+	output: AssistantMessage,
+	stream: AssistantMessageEventStream,
+): void {
+	if (block.type === "text") {
+		stream.push({ type: "text_end", contentIndex, content: block.text, partial: output });
+	} else {
+		stream.push({ type: "thinking_end", contentIndex, content: block.thinking, partial: output });
+	}
+}
+
+/**
+ * Push the three lifecycle events (`toolcall_start` / `toolcall_delta` / `toolcall_end`) for a
+ * fully-assembled `ToolCall`. Caller is responsible for appending the toolCall to `output.content`
+ * before invoking — this helper does not mutate `output.content`.
+ */
+export function pushToolCallEvents(
+	toolCall: ToolCall,
+	contentIndex: number,
+	output: AssistantMessage,
+	stream: AssistantMessageEventStream,
+): void {
+	stream.push({ type: "toolcall_start", contentIndex, partial: output });
+	stream.push({
+		type: "toolcall_delta",
+		contentIndex,
+		delta: JSON.stringify(toolCall.arguments),
+		partial: output,
+	});
+	stream.push({ type: "toolcall_end", contentIndex, toolCall, partial: output });
+}
+
+/**
+ * Append a new text- or thinking-block to `output.content` and push the matching
+ * `text_start` / `thinking_start` event. `onBeforeStartEvent` lets the SSE consumer
+ * inject its `ensureStarted()` first-token side effect into the canonical event order.
+ */
+export function startTextOrThinkingBlock(
+	isThinking: boolean,
+	output: AssistantMessage,
+	stream: AssistantMessageEventStream,
+	onBeforeStartEvent?: () => void,
+): TextContent | ThinkingContent {
+	const block: TextContent | ThinkingContent = isThinking
+		? { type: "thinking", thinking: "", thinkingSignature: undefined }
+		: { type: "text", text: "" };
+	output.content.push(block);
+	onBeforeStartEvent?.();
+	const contentIndex = output.content.length - 1;
+	if (isThinking) {
+		stream.push({ type: "thinking_start", contentIndex, partial: output });
+	} else {
+		stream.push({ type: "text_start", contentIndex, partial: output });
+	}
+	return block;
+}
+
+/**
+ * Drives the chunked `generateContentStream` iterator into an `AssistantMessage` and
+ * the corresponding `AssistantMessageEventStream`. Shared between `streamGoogle` and
+ * `streamGoogleVertex` — every observable event order and stop-reason rule is preserved.
+ *
+ * The caller still owns: `output` construction, timing fields (`duration`/`ttft`),
+ * `rawRequestDump`, the `client.models.generateContentStream(params)` call itself,
+ * pushing `start`/`done`/`error` events, and the surrounding try/catch that translates
+ * thrown errors into `output.stopReason`/`errorMessage`.
+ *
+ * This helper handles: the chunk loop, currentBlock flush transitions, usage metadata
+ * decoding (`calculateCost` included), tool-call id collision avoidance, finish-reason
+ * mapping, and the abort/stop-reason post-checks that re-throw to bubble into the
+ * caller's catch.
+ */
+export async function consumeGoogleStream<T extends GoogleApiType>(args: {
+	googleStream: AsyncIterable<GenerateContentResponse>;
+	output: AssistantMessage;
+	stream: AssistantMessageEventStream;
+	model: Model<T>;
+	options: { signal?: AbortSignal } | undefined;
+	/** Vertex preserves `textSignature` on streamed text deltas; google-generative-ai does not. */
+	retainTextSignature?: boolean;
+	onFirstToken?: () => void;
+}): Promise<void> {
+	const { googleStream, output, stream, model, options, retainTextSignature, onFirstToken } = args;
+	const blocks = output.content;
+	const blockIndex = () => blocks.length - 1;
+	let currentBlock: TextContent | ThinkingContent | null = null;
+	let firstTokenSeen = false;
+
+	const flushCurrent = () => {
+		if (!currentBlock) return;
+		pushBlockEndEvent(currentBlock, blockIndex(), output, stream);
+	};
+
+	for await (const chunk of googleStream) {
+		const candidate = chunk.candidates?.[0];
+		if (candidate?.content?.parts) {
+			for (const part of candidate.content.parts) {
+				if (part.text !== undefined) {
+					if (!firstTokenSeen) {
+						firstTokenSeen = true;
+						onFirstToken?.();
+					}
+					const isThinking = isThinkingPart(part);
+					if (
+						!currentBlock ||
+						(isThinking && currentBlock.type !== "thinking") ||
+						(!isThinking && currentBlock.type !== "text")
+					) {
+						flushCurrent();
+						currentBlock = startTextOrThinkingBlock(isThinking, output, stream);
+					}
+					if (currentBlock.type === "thinking") {
+						currentBlock.thinking += part.text;
+						currentBlock.thinkingSignature = retainThoughtSignature(
+							currentBlock.thinkingSignature,
+							part.thoughtSignature,
+						);
+						stream.push({
+							type: "thinking_delta",
+							contentIndex: blockIndex(),
+							delta: part.text,
+							partial: output,
+						});
+					} else {
+						currentBlock.text += part.text;
+						if (retainTextSignature) {
+							currentBlock.textSignature = retainThoughtSignature(
+								currentBlock.textSignature,
+								part.thoughtSignature,
+							);
+						}
+						stream.push({
+							type: "text_delta",
+							contentIndex: blockIndex(),
+							delta: part.text,
+							partial: output,
+						});
+					}
+				}
+
+				if (part.functionCall) {
+					if (currentBlock) {
+						flushCurrent();
+						currentBlock = null;
+					}
+
+					// Generate unique ID if not provided or if it's a duplicate
+					const providedId = part.functionCall.id;
+					const needsNewId = !providedId || output.content.some(b => b.type === "toolCall" && b.id === providedId);
+					const toolCallId = needsNewId ? nextToolCallId(part.functionCall.name || "tool") : providedId;
+
+					const toolCall: ToolCall = {
+						type: "toolCall",
+						id: toolCallId,
+						name: part.functionCall.name || "",
+						arguments: (part.functionCall.args ?? {}) as Record<string, any>,
+						...(part.thoughtSignature && { thoughtSignature: part.thoughtSignature }),
+					};
+
+					output.content.push(toolCall);
+					pushToolCallEvents(toolCall, blockIndex(), output, stream);
+				}
+			}
+		}
+
+		if (candidate?.finishReason) {
+			output.stopReason = mapStopReason(candidate.finishReason);
+			if (output.content.some(b => b.type === "toolCall")) {
+				output.stopReason = "toolUse";
+			}
+		}
+
+		if (chunk.usageMetadata) {
+			// promptTokenCount includes cachedContentTokenCount when cached content is used.
+			// Subtract to get non-cached input, matching the OpenAI convention where
+			// input = uncached prompt tokens and cacheRead = cached tokens so that
+			// input + cacheRead = total prompt tokens (no double-counting).
+			// Ref: https://ai.google.dev/api/generate-content#v1beta.GenerateContentResponse.UsageMetadata
+			const cachedTokens = chunk.usageMetadata.cachedContentTokenCount || 0;
+			const thinkingTokens = chunk.usageMetadata.thoughtsTokenCount || 0;
+			output.usage = {
+				input: (chunk.usageMetadata.promptTokenCount || 0) - cachedTokens,
+				output: (chunk.usageMetadata.candidatesTokenCount || 0) + thinkingTokens,
+				cacheRead: cachedTokens,
+				cacheWrite: 0,
+				totalTokens: chunk.usageMetadata.totalTokenCount || 0,
+				...(thinkingTokens > 0 ? { reasoningTokens: thinkingTokens } : {}),
+				cost: {
+					input: 0,
+					output: 0,
+					cacheRead: 0,
+					cacheWrite: 0,
+					total: 0,
+				},
+			};
+			calculateCost(model, output.usage);
+		}
+	}
+
+	flushCurrent();
+
+	if (options?.signal?.aborted) {
+		throw new Error("Request was aborted");
+	}
+
+	if (output.stopReason === "aborted" || output.stopReason === "error") {
+		throw new Error(output.errorMessage ?? "An unknown error occurred");
+	}
+}
+
+/**
+ * Generation/sampling fields that map directly onto Gemini's `GenerateContentConfig`.
+ * Excludes any provider-specific extensions (`topP`/`topK`/etc are all forwarded as-is).
+ */
+interface GoogleGenerationConfig extends GenerateContentConfig {
+	topP?: number;
+	topK?: number;
+	minP?: number;
+	presencePenalty?: number;
+	repetitionPenalty?: number;
+}
+
+/**
+ * Build the `GenerateContentParameters` payload for the public Gemini API and Vertex AI.
+ * Both surfaces accept the same `GenerateContentConfig` shape — every numeric/string knob,
+ * tool-config, thinking-config, and system-instruction conversion is identical.
+ *
+ * `google-gemini-cli` is NOT routed through here: its `CloudCodeAssistRequest` body has a
+ * distinct top-level shape (project/request/requestType) and a different thinking-config
+ * placement on `generationConfig`.
+ */
+export function buildGoogleGenerateContentParams<T extends "google-generative-ai" | "google-vertex">(
+	model: Model<T>,
+	context: Context,
+	options: GoogleSharedStreamOptions,
+): GenerateContentParameters {
+	const systemPrompts = normalizeSystemPrompts(context.systemPrompt);
+	const contents = convertMessages(model, context);
+
+	const generationConfig: GoogleGenerationConfig = {};
+	if (options.temperature !== undefined) generationConfig.temperature = options.temperature;
+	if (options.maxTokens !== undefined) generationConfig.maxOutputTokens = options.maxTokens;
+	if (options.topP !== undefined) generationConfig.topP = options.topP;
+	if (options.topK !== undefined) generationConfig.topK = options.topK;
+	if (options.minP !== undefined) generationConfig.minP = options.minP;
+	if (options.presencePenalty !== undefined) generationConfig.presencePenalty = options.presencePenalty;
+	if (options.repetitionPenalty !== undefined) generationConfig.repetitionPenalty = options.repetitionPenalty;
+
+	const config: GenerateContentConfig = {
+		...(Object.keys(generationConfig).length > 0 && generationConfig),
+		...(systemPrompts.length > 0 && { systemInstruction: { parts: systemPrompts.map(text => ({ text })) } }),
+		...(context.tools && context.tools.length > 0 && { tools: convertTools(context.tools, model) }),
+	};
+
+	if (context.tools && context.tools.length > 0 && options.toolChoice) {
+		config.toolConfig = {
+			functionCallingConfig: {
+				mode: mapToolChoice(options.toolChoice),
+			},
+		};
+	} else {
+		config.toolConfig = undefined;
+	}
+
+	if (options.thinking?.enabled && model.reasoning) {
+		const cfg: ThinkingConfig = { includeThoughts: true };
+		if (options.thinking.level !== undefined) {
+			// GoogleThinkingLevel mirrors the SDK's `ThinkingLevel` string enum values 1:1.
+			cfg.thinkingLevel = options.thinking.level as ThinkingLevel;
+		} else if (options.thinking.budgetTokens !== undefined) {
+			cfg.thinkingBudget = options.thinking.budgetTokens;
+		}
+		config.thinkingConfig = cfg;
+	}
+
+	if (options.signal) {
+		if (options.signal.aborted) {
+			throw new Error("Request aborted");
+		}
+		config.abortSignal = options.signal;
+	}
+
+	return {
+		model: model.id,
+		contents,
+		config,
+	};
+}
+
+/**
+ * Drive the `streamGoogle` / `streamGoogleVertex` event flow: build the assistant message,
+ * push start/done/error events, run `consumeGoogleStream`, and translate thrown errors into
+ * the canonical `error` event shape.
+ *
+ * Caller-supplied `prepare()` runs inside the try-block so any failure (missing project,
+ * bad auth, etc.) is funneled through the same error path as a streaming failure.
+ */
+export function streamGoogleGenAI<T extends "google-generative-ai" | "google-vertex">(args: {
+	model: Model<T>;
+	options: GoogleSharedStreamOptions | undefined;
+	api: T;
+	retainTextSignature?: boolean;
+	prepare: () => { client: GoogleGenAI; params: GenerateContentParameters; url: string | undefined };
+}): AssistantMessageEventStream {
+	const { model, options, api, retainTextSignature, prepare } = args;
+	const stream = new AssistantMessageEventStream();
+
+	(async () => {
+		const startTime = Date.now();
+		let firstTokenTime: number | undefined;
+
+		const output: AssistantMessage = {
+			role: "assistant",
+			content: [],
+			api: api as Api,
+			provider: model.provider,
+			model: model.id,
+			usage: {
+				input: 0,
+				output: 0,
+				cacheRead: 0,
+				cacheWrite: 0,
+				totalTokens: 0,
+				cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+			},
+			stopReason: "stop",
+			timestamp: Date.now(),
+		};
+		let rawRequestDump: RawHttpRequestDump | undefined;
+
+		try {
+			const { client, params, url } = prepare();
+			options?.onPayload?.(params);
+			rawRequestDump = {
+				provider: model.provider,
+				api: output.api,
+				model: model.id,
+				method: "POST",
+				url,
+				body: params,
+			};
+			const googleStream = await client.models.generateContentStream(params);
+
+			stream.push({ type: "start", partial: output });
+			await consumeGoogleStream({
+				googleStream,
+				output,
+				stream,
+				model,
+				options,
+				retainTextSignature,
+				onFirstToken: () => {
+					firstTokenTime = Date.now();
+				},
+			});
+
+			output.duration = Date.now() - startTime;
+			if (firstTokenTime) output.ttft = firstTokenTime - startTime;
+			stream.push({ type: "done", reason: output.stopReason as "length" | "stop" | "toolUse", message: output });
+			stream.end();
+		} catch (error) {
+			for (const block of output.content) {
+				if ("index" in block) {
+					delete (block as { index?: number }).index;
+				}
+			}
+			output.stopReason = options?.signal?.aborted ? "aborted" : "error";
+			output.errorMessage = await finalizeErrorMessage(error, rawRequestDump);
+			output.duration = Date.now() - startTime;
+			if (firstTokenTime) output.ttft = firstTokenTime - startTime;
+			stream.push({ type: "error", reason: output.stopReason, error: output });
+			stream.end();
+		}
+	})();
+
+	return stream;
+}

packages/ai/src/providers/google-vertex.ts

@@ -1,317 +1,38 @@
-import {
-	type GenerateContentConfig,
-	type GenerateContentParameters,
-	GoogleGenAI,
-	type ThinkingConfig,
-	ThinkingLevel,
-} from "@google/genai";
+import { GoogleGenAI } from "@google/genai";
 import { $env } from "@oh-my-pi/pi-utils";
-import { calculateCost } from "../models";
-import type {
-	Api,
-	AssistantMessage,
-	Context,
-	Model,
-	StreamFunction,
-	StreamOptions,
-	TextContent,
-	ThinkingContent,
-	ToolCall,
-} from "../types";
-import { normalizeSystemPrompts } from "../utils";
-import { AssistantMessageEventStream } from "../utils/event-stream";
-import { finalizeErrorMessage, type RawHttpRequestDump } from "../utils/http-inspector";
-import type { GoogleThinkingLevel } from "./google-gemini-cli";
-import {
-	convertMessages,
-	convertTools,
-	isThinkingPart,
-	mapStopReason,
-	mapToolChoice,
-	retainThoughtSignature,
-} from "./google-shared";
+import type { Context, Model, StreamFunction } from "../types";
+import type { AssistantMessageEventStream } from "../utils/event-stream";
+import { buildGoogleGenerateContentParams, type GoogleSharedStreamOptions, streamGoogleGenAI } from "./google-shared";
 
-export interface GoogleVertexOptions extends StreamOptions {
-	toolChoice?: "auto" | "none" | "any";
-	thinking?: {
-		enabled: boolean;
-		budgetTokens?: number; // -1 for dynamic, 0 to disable
-		level?: GoogleThinkingLevel;
-	};
+export interface GoogleVertexOptions extends GoogleSharedStreamOptions {
 	project?: string;
 	location?: string;
 }
 
-interface GoogleVertexSamplingConfig extends GenerateContentConfig {
-	topP?: number;
-	topK?: number;
-	minP?: number;
-	presencePenalty?: number;
-	repetitionPenalty?: number;
-}
-
 const API_VERSION = "v1";
 
-const THINKING_LEVEL_MAP: Record<GoogleThinkingLevel, ThinkingLevel> = {
-	THINKING_LEVEL_UNSPECIFIED: ThinkingLevel.THINKING_LEVEL_UNSPECIFIED,
-	MINIMAL: ThinkingLevel.MINIMAL,
-	LOW: ThinkingLevel.LOW,
-	MEDIUM: ThinkingLevel.MEDIUM,
-	HIGH: ThinkingLevel.HIGH,
-};
-
-// Counter for generating unique tool call IDs
-let toolCallCounter = 0;
-
 export const streamGoogleVertex: StreamFunction<"google-vertex"> = (
 	model: Model<"google-vertex">,
 	context: Context,
 	options?: GoogleVertexOptions,
-): AssistantMessageEventStream => {
-	const stream = new AssistantMessageEventStream();
-
-	(async () => {
-		const startTime = Date.now();
-		let firstTokenTime: number | undefined;
-
-		const output: AssistantMessage = {
-			role: "assistant",
-			content: [],
-			api: "google-vertex" as Api,
-			provider: model.provider,
-			model: model.id,
-			usage: {
-				input: 0,
-				output: 0,
-				cacheRead: 0,
-				cacheWrite: 0,
-				totalTokens: 0,
-				cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
-			},
-			stopReason: "stop",
-			timestamp: Date.now(),
-		};
-		let rawRequestDump: RawHttpRequestDump | undefined;
-
-		try {
+): AssistantMessageEventStream =>
+	streamGoogleGenAI({
+		model,
+		options,
+		api: "google-vertex",
+		retainTextSignature: true,
+		prepare: () => {
 			const apiKey = resolveApiKey(options);
 			const project = apiKey ? undefined : resolveProject(options);
 			const location = apiKey ? undefined : resolveLocation(options);
 			const client = apiKey ? createClientWithApiKey(model, apiKey) : createClient(model, project!, location!);
-			const params = buildParams(model, context, options);
-			options?.onPayload?.(params);
-			rawRequestDump = {
-				provider: model.provider,
-				api: output.api,
-				model: model.id,
-				method: "POST",
-				url: apiKey
+			const params = buildGoogleGenerateContentParams(model, context, options ?? {});
+			const url = apiKey
 				? `https://aiplatform.googleapis.com/${API_VERSION}/publishers/google/models/${model.id}:streamGenerateContent`
-					: `https://${location}-aiplatform.googleapis.com/${API_VERSION}/projects/${project}/locations/${location}/publishers/google/models/${model.id}:streamGenerateContent`,
-				body: params,
-			};
-			const googleStream = await client.models.generateContentStream(params);
-
-			stream.push({ type: "start", partial: output });
-			let currentBlock: TextContent | ThinkingContent | null = null;
-			const blocks = output.content;
-			const blockIndex = () => blocks.length - 1;
-			for await (const chunk of googleStream) {
-				const candidate = chunk.candidates?.[0];
-				if (candidate?.content?.parts) {
-					for (const part of candidate.content.parts) {
-						if (part.text !== undefined) {
-							if (!firstTokenTime) firstTokenTime = Date.now();
-							const isThinking = isThinkingPart(part);
-							if (
-								!currentBlock ||
-								(isThinking && currentBlock.type !== "thinking") ||
-								(!isThinking && currentBlock.type !== "text")
-							) {
-								if (currentBlock) {
-									if (currentBlock.type === "text") {
-										stream.push({
-											type: "text_end",
-											contentIndex: blocks.length - 1,
-											content: currentBlock.text,
-											partial: output,
-										});
-									} else {
-										stream.push({
-											type: "thinking_end",
-											contentIndex: blockIndex(),
-											content: currentBlock.thinking,
-											partial: output,
-										});
-									}
-								}
-								if (isThinking) {
-									currentBlock = { type: "thinking", thinking: "", thinkingSignature: undefined };
-									output.content.push(currentBlock);
-									stream.push({ type: "thinking_start", contentIndex: blockIndex(), partial: output });
-								} else {
-									currentBlock = { type: "text", text: "" };
-									output.content.push(currentBlock);
-									stream.push({ type: "text_start", contentIndex: blockIndex(), partial: output });
-								}
-							}
-							if (currentBlock.type === "thinking") {
-								currentBlock.thinking += part.text;
-								currentBlock.thinkingSignature = retainThoughtSignature(
-									currentBlock.thinkingSignature,
-									part.thoughtSignature,
-								);
-								stream.push({
-									type: "thinking_delta",
-									contentIndex: blockIndex(),
-									delta: part.text,
-									partial: output,
-								});
-							} else {
-								currentBlock.text += part.text;
-								currentBlock.textSignature = retainThoughtSignature(
-									currentBlock.textSignature,
-									part.thoughtSignature,
-								);
-								stream.push({
-									type: "text_delta",
-									contentIndex: blockIndex(),
-									delta: part.text,
-									partial: output,
-								});
-							}
-						}
-
-						if (part.functionCall) {
-							if (currentBlock) {
-								if (currentBlock.type === "text") {
-									stream.push({
-										type: "text_end",
-										contentIndex: blockIndex(),
-										content: currentBlock.text,
-										partial: output,
-									});
-								} else {
-									stream.push({
-										type: "thinking_end",
-										contentIndex: blockIndex(),
-										content: currentBlock.thinking,
-										partial: output,
-									});
-								}
-								currentBlock = null;
-							}
-
-							const providedId = part.functionCall.id;
-							const needsNewId =
-								!providedId || output.content.some(b => b.type === "toolCall" && b.id === providedId);
-							const toolCallId = needsNewId
-								? `${part.functionCall.name}_${Date.now()}_${++toolCallCounter}`
-								: providedId;
-
-							const toolCall: ToolCall = {
-								type: "toolCall",
-								id: toolCallId,
-								name: part.functionCall.name || "",
-								arguments: part.functionCall.args as Record<string, any>,
-								...(part.thoughtSignature && { thoughtSignature: part.thoughtSignature }),
-							};
-
-							output.content.push(toolCall);
-							stream.push({ type: "toolcall_start", contentIndex: blockIndex(), partial: output });
-							stream.push({
-								type: "toolcall_delta",
-								contentIndex: blockIndex(),
-								delta: JSON.stringify(toolCall.arguments),
-								partial: output,
-							});
-							stream.push({ type: "toolcall_end", contentIndex: blockIndex(), toolCall, partial: output });
-						}
-					}
-				}
-
-				if (candidate?.finishReason) {
-					output.stopReason = mapStopReason(candidate.finishReason);
-					if (output.content.some(b => b.type === "toolCall")) {
-						output.stopReason = "toolUse";
-					}
-				}
-
-				if (chunk.usageMetadata) {
-					// promptTokenCount includes cachedContentTokenCount when cached content is used.
-					// Subtract to get non-cached input, matching the OpenAI convention where
-					// input = uncached prompt tokens and cacheRead = cached tokens so that
-					// input + cacheRead = total prompt tokens (no double-counting).
-					// Ref: https://ai.google.dev/api/generate-content#v1beta.GenerateContentResponse.UsageMetadata
-					const cachedTokens = chunk.usageMetadata.cachedContentTokenCount || 0;
-					const thinkingTokens = chunk.usageMetadata.thoughtsTokenCount || 0;
-					output.usage = {
-						input: (chunk.usageMetadata.promptTokenCount || 0) - cachedTokens,
-						output: (chunk.usageMetadata.candidatesTokenCount || 0) + thinkingTokens,
-						cacheRead: cachedTokens,
-						cacheWrite: 0,
-						totalTokens: chunk.usageMetadata.totalTokenCount || 0,
-						...(thinkingTokens > 0 ? { reasoningTokens: thinkingTokens } : {}),
-						cost: {
-							input: 0,
-							output: 0,
-							cacheRead: 0,
-							cacheWrite: 0,
-							total: 0,
+				: `https://${location}-aiplatform.googleapis.com/${API_VERSION}/projects/${project}/locations/${location}/publishers/google/models/${model.id}:streamGenerateContent`;
+			return { client, params, url };
 		},
-					};
-					calculateCost(model, output.usage);
-				}
-			}
-
-			if (currentBlock) {
-				if (currentBlock.type === "text") {
-					stream.push({
-						type: "text_end",
-						contentIndex: blockIndex(),
-						content: currentBlock.text,
-						partial: output,
 	});
-				} else {
-					stream.push({
-						type: "thinking_end",
-						contentIndex: blockIndex(),
-						content: currentBlock.thinking,
-						partial: output,
-					});
-				}
-			}
-
-			if (options?.signal?.aborted) {
-				throw new Error("Request was aborted");
-			}
-
-			if (output.stopReason === "aborted" || output.stopReason === "error") {
-				throw new Error(output.errorMessage ?? "An unknown error occurred");
-			}
-
-			output.duration = Date.now() - startTime;
-			if (firstTokenTime) output.ttft = firstTokenTime - startTime;
-			stream.push({ type: "done", reason: output.stopReason, message: output });
-			stream.end();
-		} catch (error) {
-			// Remove internal index property used during streaming
-			for (const block of output.content) {
-				if ("index" in block) {
-					delete (block as { index?: number }).index;
-				}
-			}
-			output.stopReason = options?.signal?.aborted ? "aborted" : "error";
-			output.errorMessage = await finalizeErrorMessage(error, rawRequestDump);
-			output.duration = Date.now() - startTime;
-			if (firstTokenTime) output.ttft = firstTokenTime - startTime;
-			stream.push({ type: "error", reason: output.stopReason, error: output });
-			stream.end();
-		}
-	})();
-
-	return stream;
-};
 
 function buildHttpOptions(model: Model<"google-vertex">): { headers?: Record<string, string> } | undefined {
 	if (!model.headers) {
@@ -364,76 +85,3 @@ function resolveLocation(options?: GoogleVertexOptions): string {
 	}
 	return location;
 }
-
-function buildParams(
-	model: Model<"google-vertex">,
-	context: Context,
-	options: GoogleVertexOptions = {},
-): GenerateContentParameters {
-	const systemPrompts = normalizeSystemPrompts(context.systemPrompt);
-	const contents = convertMessages(model, context);
-
-	const generationConfig: GoogleVertexSamplingConfig = {};
-	if (options.temperature !== undefined) {
-		generationConfig.temperature = options.temperature;
-	}
-	if (options.maxTokens !== undefined) {
-		generationConfig.maxOutputTokens = options.maxTokens;
-	}
-	if (options.topP !== undefined) {
-		generationConfig.topP = options.topP;
-	}
-	if (options.topK !== undefined) {
-		generationConfig.topK = options.topK;
-	}
-	if (options.minP !== undefined) {
-		generationConfig.minP = options.minP;
-	}
-	if (options.presencePenalty !== undefined) {
-		generationConfig.presencePenalty = options.presencePenalty;
-	}
-	if (options.repetitionPenalty !== undefined) {
-		generationConfig.repetitionPenalty = options.repetitionPenalty;
-	}
-
-	const config: GenerateContentConfig = {
-		...(Object.keys(generationConfig).length > 0 && generationConfig),
-		...(systemPrompts.length > 0 && { systemInstruction: { parts: systemPrompts.map(text => ({ text })) } }),
-		...(context.tools && context.tools.length > 0 && { tools: convertTools(context.tools, model) }),
-	};
-
-	if (context.tools && context.tools.length > 0 && options.toolChoice) {
-		config.toolConfig = {
-			functionCallingConfig: {
-				mode: mapToolChoice(options.toolChoice),
-			},
-		};
-	} else {
-		config.toolConfig = undefined;
-	}
-
-	if (options.thinking?.enabled && model.reasoning) {
-		const cfg: ThinkingConfig = { includeThoughts: true };
-		if (options.thinking.level !== undefined) {
-			cfg.thinkingLevel = THINKING_LEVEL_MAP[options.thinking.level];
-		} else if (options.thinking.budgetTokens !== undefined) {
-			cfg.thinkingBudget = options.thinking.budgetTokens;
-		}
-		config.thinkingConfig = cfg;
-	}
-
-	if (options.signal) {
-		if (options.signal.aborted) {
-			throw new Error("Request aborted");
-		}
-		config.abortSignal = options.signal;
-	}
-
-	const params: GenerateContentParameters = {
-		model: model.id,
-		contents,
-		config,
-	};
-
-	return params;
-}

packages/ai/src/providers/google.ts

@@ -1,297 +1,28 @@
-import {
-	type GenerateContentConfig,
-	type GenerateContentParameters,
-	GoogleGenAI,
-	type ThinkingConfig,
-} from "@google/genai";
-import { calculateCost } from "../models";
+import { GoogleGenAI } from "@google/genai";
 import { getEnvApiKey } from "../stream";
-import type {
-	Api,
-	AssistantMessage,
-	Context,
-	Model,
-	StreamFunction,
-	StreamOptions,
-	TextContent,
-	ThinkingContent,
-	ToolCall,
-} from "../types";
-import { normalizeSystemPrompts } from "../utils";
-import { AssistantMessageEventStream } from "../utils/event-stream";
-import { finalizeErrorMessage, type RawHttpRequestDump } from "../utils/http-inspector";
-import type { GoogleThinkingLevel } from "./google-gemini-cli";
-import {
-	convertMessages,
-	convertTools,
-	isThinkingPart,
-	mapStopReason,
-	mapToolChoice,
-	retainThoughtSignature,
-} from "./google-shared";
+import type { Context, Model, StreamFunction } from "../types";
+import type { AssistantMessageEventStream } from "../utils/event-stream";
+import { buildGoogleGenerateContentParams, type GoogleSharedStreamOptions, streamGoogleGenAI } from "./google-shared";
 
-export interface GoogleOptions extends StreamOptions {
-	toolChoice?: "auto" | "none" | "any";
-	thinking?: {
-		enabled: boolean;
-		budgetTokens?: number; // -1 for dynamic, 0 to disable
-		level?: GoogleThinkingLevel;
-	};
-}
-
-interface GoogleSamplingConfig extends GenerateContentConfig {
-	topP?: number;
-	topK?: number;
-	minP?: number;
-	presencePenalty?: number;
-	repetitionPenalty?: number;
-}
-
-// Counter for generating unique tool call IDs
-let toolCallCounter = 0;
+export type GoogleOptions = GoogleSharedStreamOptions;
 
 export const streamGoogle: StreamFunction<"google-generative-ai"> = (
 	model: Model<"google-generative-ai">,
 	context: Context,
 	options?: GoogleOptions,
-): AssistantMessageEventStream => {
-	const stream = new AssistantMessageEventStream();
-
-	(async () => {
-		const startTime = Date.now();
-		let firstTokenTime: number | undefined;
-
-		const output: AssistantMessage = {
-			role: "assistant",
-			content: [],
-			api: "google-generative-ai" as Api,
-			provider: model.provider,
-			model: model.id,
-			usage: {
-				input: 0,
-				output: 0,
-				cacheRead: 0,
-				cacheWrite: 0,
-				totalTokens: 0,
-				cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
-			},
-			stopReason: "stop",
-			timestamp: Date.now(),
-		};
-		let rawRequestDump: RawHttpRequestDump | undefined;
-
-		try {
+): AssistantMessageEventStream =>
+	streamGoogleGenAI({
+		model,
+		options,
+		api: "google-generative-ai",
+		prepare: () => {
 			const apiKey = options?.apiKey || getEnvApiKey(model.provider);
 			const client = createClient(model, apiKey);
-			const params = buildParams(model, context, options);
-			options?.onPayload?.(params);
-			rawRequestDump = {
-				provider: model.provider,
-				api: output.api,
-				model: model.id,
-				method: "POST",
-				url: model.baseUrl ? `${model.baseUrl}/models/${model.id}:streamGenerateContent` : undefined,
-				body: params,
-			};
-			const googleStream = await client.models.generateContentStream(params);
-
-			stream.push({ type: "start", partial: output });
-			let currentBlock: TextContent | ThinkingContent | null = null;
-			const blocks = output.content;
-			const blockIndex = () => blocks.length - 1;
-			for await (const chunk of googleStream) {
-				const candidate = chunk.candidates?.[0];
-				if (candidate?.content?.parts) {
-					for (const part of candidate.content.parts) {
-						if (part.text !== undefined) {
-							const isThinking = isThinkingPart(part);
-							if (!firstTokenTime) firstTokenTime = Date.now();
-							if (
-								!currentBlock ||
-								(isThinking && currentBlock.type !== "thinking") ||
-								(!isThinking && currentBlock.type !== "text")
-							) {
-								if (currentBlock) {
-									if (currentBlock.type === "text") {
-										stream.push({
-											type: "text_end",
-											contentIndex: blocks.length - 1,
-											content: currentBlock.text,
-											partial: output,
-										});
-									} else {
-										stream.push({
-											type: "thinking_end",
-											contentIndex: blockIndex(),
-											content: currentBlock.thinking,
-											partial: output,
-										});
-									}
-								}
-								if (isThinking) {
-									currentBlock = { type: "thinking", thinking: "", thinkingSignature: undefined };
-									output.content.push(currentBlock);
-									stream.push({ type: "thinking_start", contentIndex: blockIndex(), partial: output });
-								} else {
-									currentBlock = { type: "text", text: "" };
-									output.content.push(currentBlock);
-									stream.push({ type: "text_start", contentIndex: blockIndex(), partial: output });
-								}
-							}
-							if (currentBlock.type === "thinking") {
-								currentBlock.thinking += part.text;
-								currentBlock.thinkingSignature = retainThoughtSignature(
-									currentBlock.thinkingSignature,
-									part.thoughtSignature,
-								);
-								stream.push({
-									type: "thinking_delta",
-									contentIndex: blockIndex(),
-									delta: part.text,
-									partial: output,
-								});
-							} else {
-								currentBlock.text += part.text;
-								stream.push({
-									type: "text_delta",
-									contentIndex: blockIndex(),
-									delta: part.text,
-									partial: output,
-								});
-							}
-						}
-
-						if (part.functionCall) {
-							if (currentBlock) {
-								if (currentBlock.type === "text") {
-									stream.push({
-										type: "text_end",
-										contentIndex: blockIndex(),
-										content: currentBlock.text,
-										partial: output,
-									});
-								} else {
-									stream.push({
-										type: "thinking_end",
-										contentIndex: blockIndex(),
-										content: currentBlock.thinking,
-										partial: output,
-									});
-								}
-								currentBlock = null;
-							}
-
-							// Generate unique ID if not provided or if it's a duplicate
-							const providedId = part.functionCall.id;
-							const needsNewId =
-								!providedId || output.content.some(b => b.type === "toolCall" && b.id === providedId);
-							const toolCallId = needsNewId
-								? `${part.functionCall.name}_${Date.now()}_${++toolCallCounter}`
-								: providedId;
-
-							const toolCall: ToolCall = {
-								type: "toolCall",
-								id: toolCallId,
-								name: part.functionCall.name || "",
-								arguments: (part.functionCall.args ?? {}) as Record<string, any>,
-								...(part.thoughtSignature && { thoughtSignature: part.thoughtSignature }),
-							};
-
-							output.content.push(toolCall);
-							stream.push({ type: "toolcall_start", contentIndex: blockIndex(), partial: output });
-							stream.push({
-								type: "toolcall_delta",
-								contentIndex: blockIndex(),
-								delta: JSON.stringify(toolCall.arguments),
-								partial: output,
-							});
-							stream.push({ type: "toolcall_end", contentIndex: blockIndex(), toolCall, partial: output });
-						}
-					}
-				}
-
-				if (candidate?.finishReason) {
-					output.stopReason = mapStopReason(candidate.finishReason);
-					if (output.content.some(b => b.type === "toolCall")) {
-						output.stopReason = "toolUse";
-					}
-				}
-
-				if (chunk.usageMetadata) {
-					// promptTokenCount includes cachedContentTokenCount when cached content is used.
-					// Subtract to get non-cached input, matching the OpenAI convention where
-					// input = uncached prompt tokens and cacheRead = cached tokens so that
-					// input + cacheRead = total prompt tokens (no double-counting).
-					// Ref: https://ai.google.dev/api/generate-content#v1beta.GenerateContentResponse.UsageMetadata
-					const cachedTokens = chunk.usageMetadata.cachedContentTokenCount || 0;
-					const thinkingTokens = chunk.usageMetadata.thoughtsTokenCount || 0;
-					output.usage = {
-						input: (chunk.usageMetadata.promptTokenCount || 0) - cachedTokens,
-						output: (chunk.usageMetadata.candidatesTokenCount || 0) + thinkingTokens,
-						cacheRead: cachedTokens,
-						cacheWrite: 0,
-						totalTokens: chunk.usageMetadata.totalTokenCount || 0,
-						...(thinkingTokens > 0 ? { reasoningTokens: thinkingTokens } : {}),
-						cost: {
-							input: 0,
-							output: 0,
-							cacheRead: 0,
-							cacheWrite: 0,
-							total: 0,
+			const params = buildGoogleGenerateContentParams(model, context, options ?? {});
+			const url = model.baseUrl ? `${model.baseUrl}/models/${model.id}:streamGenerateContent` : undefined;
+			return { client, params, url };
 		},
-					};
-					calculateCost(model, output.usage);
-				}
-			}
-
-			if (currentBlock) {
-				if (currentBlock.type === "text") {
-					stream.push({
-						type: "text_end",
-						contentIndex: blockIndex(),
-						content: currentBlock.text,
-						partial: output,
 	});
-				} else {
-					stream.push({
-						type: "thinking_end",
-						contentIndex: blockIndex(),
-						content: currentBlock.thinking,
-						partial: output,
-					});
-				}
-			}
-
-			if (options?.signal?.aborted) {
-				throw new Error("Request was aborted");
-			}
-
-			if (output.stopReason === "aborted" || output.stopReason === "error") {
-				throw new Error(output.errorMessage ?? "An unknown error occurred");
-			}
-
-			output.duration = Date.now() - startTime;
-			if (firstTokenTime) output.ttft = firstTokenTime - startTime;
-			stream.push({ type: "done", reason: output.stopReason, message: output });
-			stream.end();
-		} catch (error) {
-			// Remove internal index property used during streaming
-			for (const block of output.content) {
-				if ("index" in block) {
-					delete (block as { index?: number }).index;
-				}
-			}
-			output.stopReason = options?.signal?.aborted ? "aborted" : "error";
-			output.errorMessage = await finalizeErrorMessage(error, rawRequestDump);
-			output.duration = Date.now() - startTime;
-			if (firstTokenTime) output.ttft = firstTokenTime - startTime;
-			stream.push({ type: "error", reason: output.stopReason, error: output });
-			stream.end();
-		}
-	})();
-
-	return stream;
-};
 
 function createClient(model: Model<"google-generative-ai">, apiKey?: string): GoogleGenAI {
 	const httpOptions: { baseUrl?: string; apiVersion?: string; headers?: Record<string, string> } = {};
@@ -308,77 +39,3 @@ function createClient(model: Model<"google-generative-ai">, apiKey?: string): Go
 		httpOptions: Object.keys(httpOptions).length > 0 ? httpOptions : undefined,
 	});
 }
-
-function buildParams(
-	model: Model<"google-generative-ai">,
-	context: Context,
-	options: GoogleOptions = {},
-): GenerateContentParameters {
-	const systemPrompts = normalizeSystemPrompts(context.systemPrompt);
-	const contents = convertMessages(model, context);
-
-	const generationConfig: GoogleSamplingConfig = {};
-	if (options.temperature !== undefined) {
-		generationConfig.temperature = options.temperature;
-	}
-	if (options.maxTokens !== undefined) {
-		generationConfig.maxOutputTokens = options.maxTokens;
-	}
-	if (options.topP !== undefined) {
-		generationConfig.topP = options.topP;
-	}
-	if (options.topK !== undefined) {
-		generationConfig.topK = options.topK;
-	}
-	if (options.minP !== undefined) {
-		generationConfig.minP = options.minP;
-	}
-	if (options.presencePenalty !== undefined) {
-		generationConfig.presencePenalty = options.presencePenalty;
-	}
-	if (options.repetitionPenalty !== undefined) {
-		generationConfig.repetitionPenalty = options.repetitionPenalty;
-	}
-
-	const config: GenerateContentConfig = {
-		...(Object.keys(generationConfig).length > 0 && generationConfig),
-		...(systemPrompts.length > 0 && { systemInstruction: { parts: systemPrompts.map(text => ({ text })) } }),
-		...(context.tools && context.tools.length > 0 && { tools: convertTools(context.tools, model) }),
-	};
-
-	if (context.tools && context.tools.length > 0 && options.toolChoice) {
-		config.toolConfig = {
-			functionCallingConfig: {
-				mode: mapToolChoice(options.toolChoice),
-			},
-		};
-	} else {
-		config.toolConfig = undefined;
-	}
-
-	if (options.thinking?.enabled && model.reasoning) {
-		const cfg: ThinkingConfig = { includeThoughts: true };
-		if (options.thinking.level !== undefined) {
-			// Cast to any since our GoogleThinkingLevel mirrors Google's ThinkingLevel enum values
-			cfg.thinkingLevel = options.thinking.level as any;
-		} else if (options.thinking.budgetTokens !== undefined) {
-			cfg.thinkingBudget = options.thinking.budgetTokens;
-		}
-		config.thinkingConfig = cfg;
-	}
-
-	if (options.signal) {
-		if (options.signal.aborted) {
-			throw new Error("Request aborted");
-		}
-		config.abortSignal = options.signal;
-	}
-
-	const params: GenerateContentParameters = {
-		model: model.id,
-		contents,
-		config,
-	};
-
-	return params;
-}

packages/ai/src/providers/kimi.ts

@@ -9,19 +9,21 @@
  * Note: Kimi calculates TPM rate limits based on max_tokens, not actual output.
  */
 
-import { ANTHROPIC_THINKING } from "../stream";
-import type { Api, Context, Model, SimpleStreamOptions } from "../types";
-import { AssistantMessageEventStream } from "../utils/event-stream";
+import type { Api, Context, Model } from "../types";
+import type { AssistantMessageEventStream } from "../utils/event-stream";
 import { getKimiCommonHeaders } from "../utils/oauth/kimi";
-import { streamAnthropic, streamOpenAICompletions } from "./register-builtins";
-import { createProviderErrorMessage } from "./shared/error-message";
+import {
+	type OpenAIAnthropicApiFormat,
+	type OpenAIAnthropicShimOptions,
+	streamOpenAIAnthropicShim,
+} from "./openai-anthropic-shim";
 
-export type KimiApiFormat = "openai" | "anthropic";
+export type KimiApiFormat = OpenAIAnthropicApiFormat;
 
 // Note: Anthropic SDK appends /v1/messages, so base URL should not include /v1
 const KIMI_ANTHROPIC_BASE_URL = "https://api.kimi.com/coding";
 
-export interface KimiOptions extends SimpleStreamOptions {
+export interface KimiOptions extends OpenAIAnthropicShimOptions {
 	/** API format: "openai" or "anthropic". Default: "anthropic" */
 	format?: KimiApiFormat;
 }
@@ -35,96 +37,13 @@ export function streamKimi(
 	context: Context,
 	options?: KimiOptions,
 ): AssistantMessageEventStream {
-	const stream = new AssistantMessageEventStream();
-	const format = options?.format ?? "anthropic";
-
-	// Async IIFE to handle header fetching and stream piping
-	(async () => {
-		try {
-			const mergedHeaders = { ...getKimiCommonHeaders(), ...options?.headers };
-
-			if (format === "anthropic") {
-				// Create a synthetic Anthropic model pointing to Kimi's endpoint
-				const anthropicModel: Model<"anthropic-messages"> = {
-					id: model.id,
-					name: model.name,
-					api: "anthropic-messages",
-					provider: model.provider,
-					baseUrl: KIMI_ANTHROPIC_BASE_URL,
-					headers: mergedHeaders,
-					contextWindow: model.contextWindow,
-					maxTokens: model.maxTokens,
-					reasoning: model.reasoning,
-					input: model.input,
-					cost: model.cost,
-				};
-
-				// Calculate thinking budget from reasoning level
-				const reasoning = options?.reasoning;
-				const reasoningEffort = reasoning;
-				const thinkingEnabled = !!reasoningEffort && model.reasoning;
-				const thinkingBudget = reasoningEffort
-					? (options?.thinkingBudgets?.[reasoningEffort] ?? ANTHROPIC_THINKING[reasoningEffort])
-					: undefined;
-
-				const innerStream = streamAnthropic(anthropicModel, context, {
-					apiKey: options?.apiKey,
-					temperature: options?.temperature,
-					topP: options?.topP,
-					topK: options?.topK,
-					minP: options?.minP,
-					presencePenalty: options?.presencePenalty,
-					repetitionPenalty: options?.repetitionPenalty,
-					maxTokens: options?.maxTokens ?? Math.min(model.maxTokens, 32000),
-					signal: options?.signal,
-					headers: mergedHeaders,
-					sessionId: options?.sessionId,
-					onPayload: options?.onPayload,
-					onResponse: options?.onResponse,
-					onSseEvent: options?.onSseEvent,
-					thinkingEnabled,
-					thinkingBudgetTokens: thinkingBudget,
+	return streamOpenAIAnthropicShim(model, context, options, {
+		anthropicBaseUrl: KIMI_ANTHROPIC_BASE_URL,
+		defaultFormat: "anthropic",
+		extraHeaders: getKimiCommonHeaders,
 	});
-
-				for await (const event of innerStream) {
-					stream.push(event);
-				}
-			} else {
-				// OpenAI format - use original model with Kimi headers
-				const reasoningEffort = options?.reasoning;
-				const innerStream = streamOpenAICompletions(model, context, {
-					apiKey: options?.apiKey,
-					temperature: options?.temperature,
-					topP: options?.topP,
-					topK: options?.topK,
-					minP: options?.minP,
-					presencePenalty: options?.presencePenalty,
-					repetitionPenalty: options?.repetitionPenalty,
-					maxTokens: options?.maxTokens ?? model.maxTokens,
-					signal: options?.signal,
-					headers: mergedHeaders,
-					sessionId: options?.sessionId,
-					onPayload: options?.onPayload,
-					onResponse: options?.onResponse,
-					onSseEvent: options?.onSseEvent,
-					reasoning: reasoningEffort,
-				});
-
-				for await (const event of innerStream) {
-					stream.push(event);
-				}
-			}
-		} catch (err) {
-			stream.push({
-				type: "error",
-				reason: "error",
-				error: createProviderErrorMessage(model, err),
-			});
-		}
-	})();
-
-	return stream;
 }
+
 /**
  * Check if a model is a Kimi Code model.
  */

packages/ai/src/providers/openai-anthropic-shim.ts

@@ -0,0 +1,136 @@
+/**
+ * Shared implementation for providers that expose BOTH an OpenAI-compatible
+ * and an Anthropic-compatible API surface against the same model catalog
+ * (currently Kimi Code and Synthetic).
+ *
+ * Each call site supplies the provider-specific bits (base URLs, default
+ * format, optional extra headers); the streaming/forwarding plumbing lives
+ * here once.
+ */
+
+import { ANTHROPIC_THINKING } from "../stream";
+import type { Context, Model, SimpleStreamOptions } from "../types";
+import { AssistantMessageEventStream } from "../utils/event-stream";
+import { streamAnthropic, streamOpenAICompletions } from "./register-builtins";
+import { createProviderErrorMessage } from "./shared/error-message";
+
+export type OpenAIAnthropicApiFormat = "openai" | "anthropic";
+
+export interface OpenAIAnthropicShimOptions extends SimpleStreamOptions {
+	/** API format: "openai" or "anthropic". */
+	format?: OpenAIAnthropicApiFormat;
+}
+
+export interface OpenAIAnthropicShimConfig {
+	/** Base URL for the Anthropic-compatible endpoint (without trailing /v1/messages). */
+	anthropicBaseUrl: string;
+	/** Optional override for the OpenAI-compatible base URL. If omitted, `model.baseUrl` is used as-is. */
+	openaiBaseUrl?: string;
+	/** Default API format when caller does not specify one. */
+	defaultFormat: OpenAIAnthropicApiFormat;
+	/** Provider-specific headers (e.g. auth/session) merged ahead of user-supplied headers. */
+	extraHeaders?: () => Record<string, string>;
+}
+
+/**
+ * Stream from an OpenAI-or-Anthropic compatible provider. Returns synchronously;
+ * async header fetching and stream piping happen internally.
+ */
+export function streamOpenAIAnthropicShim(
+	model: Model<"openai-completions">,
+	context: Context,
+	options: OpenAIAnthropicShimOptions | undefined,
+	config: OpenAIAnthropicShimConfig,
+): AssistantMessageEventStream {
+	const stream = new AssistantMessageEventStream();
+	const format = options?.format ?? config.defaultFormat;
+
+	(async () => {
+		try {
+			const mergedHeaders = {
+				...(config.extraHeaders?.() ?? {}),
+				...options?.headers,
+			};
+
+			if (format === "anthropic") {
+				const anthropicModel: Model<"anthropic-messages"> = {
+					id: model.id,
+					name: model.name,
+					api: "anthropic-messages",
+					provider: model.provider,
+					baseUrl: config.anthropicBaseUrl,
+					headers: mergedHeaders,
+					contextWindow: model.contextWindow,
+					maxTokens: model.maxTokens,
+					reasoning: model.reasoning,
+					input: model.input,
+					cost: model.cost,
+				};
+
+				const reasoningEffort = options?.reasoning;
+				const thinkingEnabled = !!reasoningEffort && model.reasoning;
+				const thinkingBudget = reasoningEffort
+					? (options?.thinkingBudgets?.[reasoningEffort] ?? ANTHROPIC_THINKING[reasoningEffort])
+					: undefined;
+
+				const innerStream = streamAnthropic(anthropicModel, context, {
+					apiKey: options?.apiKey,
+					temperature: options?.temperature,
+					topP: options?.topP,
+					topK: options?.topK,
+					minP: options?.minP,
+					presencePenalty: options?.presencePenalty,
+					repetitionPenalty: options?.repetitionPenalty,
+					maxTokens: options?.maxTokens ?? Math.min(model.maxTokens, 32000),
+					signal: options?.signal,
+					headers: mergedHeaders,
+					sessionId: options?.sessionId,
+					onPayload: options?.onPayload,
+					onResponse: options?.onResponse,
+					onSseEvent: options?.onSseEvent,
+					thinkingEnabled,
+					thinkingBudgetTokens: thinkingBudget,
+				});
+
+				for await (const event of innerStream) {
+					stream.push(event);
+				}
+			} else {
+				const openaiModel: Model<"openai-completions"> = config.openaiBaseUrl
+					? { ...model, baseUrl: config.openaiBaseUrl, headers: mergedHeaders }
+					: model;
+
+				const reasoningEffort = options?.reasoning;
+				const innerStream = streamOpenAICompletions(openaiModel, context, {
+					apiKey: options?.apiKey,
+					temperature: options?.temperature,
+					topP: options?.topP,
+					topK: options?.topK,
+					minP: options?.minP,
+					presencePenalty: options?.presencePenalty,
+					repetitionPenalty: options?.repetitionPenalty,
+					maxTokens: options?.maxTokens ?? model.maxTokens,
+					signal: options?.signal,
+					headers: mergedHeaders,
+					sessionId: options?.sessionId,
+					onPayload: options?.onPayload,
+					onResponse: options?.onResponse,
+					onSseEvent: options?.onSseEvent,
+					reasoning: reasoningEffort,
+				});
+
+				for await (const event of innerStream) {
+					stream.push(event);
+				}
+			}
+		} catch (err) {
+			stream.push({
+				type: "error",
+				reason: "error",
+				error: createProviderErrorMessage(model, err),
+			});
+		}
+	})();
+
+	return stream;
+}

packages/ai/src/providers/openai-codex-responses.ts

@@ -7,8 +7,6 @@ import type {
 	ResponseFunctionToolCall,
 	ResponseInput,
 	ResponseInputContent,
-	ResponseInputImage,
-	ResponseInputText,
 	ResponseOutputMessage,
 	ResponseReasoningItem,
 } from "openai/resources/responses/responses";
@@ -35,7 +33,6 @@ import {
 	createOpenAIResponsesHistoryPayload,
 	getOpenAIResponsesHistoryItems,
 	getOpenAIResponsesHistoryPayload,
-	normalizeResponsesToolCallId,
 	normalizeSystemPrompts,
 } from "../utils";
 import { AssistantMessageEventStream } from "../utils/event-stream";
@@ -54,14 +51,15 @@ import {
 import { parseCodexError } from "./openai-codex/response-handler";
 import { normalizeOpenAIResponsesPromptCacheKey } from "./openai-responses";
 import {
+	appendResponsesToolResultMessages,
+	convertResponsesAssistantMessage,
 	convertResponsesInputContent,
 	encodeResponsesToolCallId,
 	encodeTextSignatureV1,
 	mapOpenAIResponsesStopReason,
-	parseTextSignature,
+	populateResponsesUsageFromResponse,
 } from "./openai-responses-shared";
 import { transformMessages } from "./transform-messages";
-import { joinTextWithImagePlaceholder } from "./vision-guard";
 
 export interface OpenAICodexResponsesOptions extends StreamOptions {
 	reasoning?: "none" | "minimal" | "low" | "medium" | "high" | "xhigh";
@@ -1233,19 +1231,7 @@ function handleResponseCompleted(
 		}
 	).response;
 
-	if (response?.usage) {
-		const cachedTokens = response.usage.input_tokens_details?.cached_tokens || 0;
-		const reasoningTokens = response.usage.output_tokens_details?.reasoning_tokens || 0;
-		output.usage = {
-			input: (response.usage.input_tokens || 0) - cachedTokens,
-			output: response.usage.output_tokens || 0,
-			cacheRead: cachedTokens,
-			cacheWrite: 0,
-			totalTokens: response.usage.total_tokens || 0,
-			...(reasoningTokens > 0 ? { reasoningTokens } : {}),
-			cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
-		};
-	}
+	populateResponsesUsageFromResponse(output, response?.usage);
 	if (typeof response?.id === "string" && response.id.length > 0) {
 		output.responseId = response.id;
 	}
@@ -2356,6 +2342,7 @@ function convertMessages(model: Model<"openai-codex-responses">, context: Contex
 	// messages can be replayed as `custom_tool_call_output` rather than
 	// `function_call_output` (OpenAI rejects mismatched pairs).
 	const customCallIds = new Set<string>();
+	const knownCallIds = new Set<string>();
 
 	for (const msg of transformedMessages) {
 		if (msg.role === "user" || msg.role === "developer") {
@@ -2407,57 +2394,14 @@ function convertMessages(model: Model<"openai-codex-responses">, context: Contex
 				continue;
 			}
 
-			const outputItems: ResponseInput = [];
-			for (const block of msg.content) {
-				if (block.type === "thinking" && msg.stopReason !== "error") {
-					if (block.thinkingSignature) {
-						outputItems.push(JSON.parse(block.thinkingSignature) as ResponseReasoningItem);
-					}
-					continue;
-				}
-				if (block.type === "text") {
-					const textBlock = block as TextContent;
-					const parsedSignature = parseTextSignature(textBlock.textSignature);
-					let msgId = parsedSignature?.id;
-					if (!msgId) {
-						msgId = `msg_${msgIndex}`;
-					} else if (msgId.length > 64) {
-						msgId = `msg_${Bun.hash(msgId).toString(36)}`;
-					}
-					outputItems.push({
-						type: "message",
-						role: "assistant",
-						content: [{ type: "output_text", text: textBlock.text.toWellFormed(), annotations: [] }],
-						status: "completed",
-						id: msgId,
-						phase: parsedSignature?.phase,
-					} satisfies ResponseOutputMessage);
-					continue;
-				}
-				if (block.type === "toolCall") {
-					const toolCall = block as ToolCall;
-					const normalized = normalizeResponsesToolCallId(toolCall.id, toolCall.customWireName ? "ctc" : "fc");
-					if (toolCall.customWireName) {
-						const rawInput = typeof toolCall.arguments?.input === "string" ? toolCall.arguments.input : "";
-						customCallIds.add(normalized.callId);
-						outputItems.push({
-							type: "custom_tool_call",
-							id: normalized.itemId,
-							call_id: normalized.callId,
-							name: toolCall.customWireName,
-							input: rawInput,
-						} as ResponseInput[number]);
-						continue;
-					}
-					outputItems.push({
-						type: "function_call",
-						id: normalized.itemId,
-						call_id: normalized.callId,
-						name: toolCall.name,
-						arguments: JSON.stringify(toolCall.arguments),
-					});
-				}
-			}
+			const outputItems = convertResponsesAssistantMessage(
+				msg as AssistantMessage,
+				model,
+				msgIndex,
+				knownCallIds,
+				true,
+				customCallIds,
+			);
 			if (outputItems.length > 0) {
 				messages.push(...outputItems);
 			}
@@ -2466,49 +2410,7 @@ function convertMessages(model: Model<"openai-codex-responses">, context: Contex
 		}
 
 		if (msg.role === "toolResult") {
-			const supportsImages = model.input.includes("image");
-			const textResult = msg.content
-				.filter(content => content.type === "text")
-				.map(content => content.text)
-				.join("\n");
-			const hasImages = msg.content.some(content => content.type === "image");
-			const omittedImages = hasImages && !supportsImages;
-			const normalized = normalizeResponsesToolCallId(msg.toolCallId);
-			const output = (
-				omittedImages
-					? joinTextWithImagePlaceholder(textResult, true)
-					: textResult.length > 0
-						? textResult
-						: "(see attached image)"
-			).toWellFormed();
-			if (customCallIds.has(normalized.callId)) {
-				messages.push({
-					type: "custom_tool_call_output",
-					call_id: normalized.callId,
-					output,
-				} as ResponseInput[number]);
-			} else {
-				messages.push({
-					type: "function_call_output",
-					call_id: normalized.callId,
-					output,
-				});
-			}
-			if (hasImages && supportsImages) {
-				const contentParts: ResponseInputContent[] = [
-					{ type: "input_text", text: "Attached image(s) from tool result:" } satisfies ResponseInputText,
-				];
-				for (const block of msg.content) {
-					if (block.type === "image") {
-						contentParts.push({
-							type: "input_image",
-							detail: "auto",
-							image_url: `data:${block.mimeType};base64,${block.data}`,
-						} satisfies ResponseInputImage);
-					}
-				}
-				messages.push({ role: "user", content: contentParts });
-			}
+			appendResponsesToolResultMessages(messages, msg, model, false, knownCallIds, customCallIds);
 		}
 
 		msgIndex += 1;

packages/ai/src/providers/openai-completions.ts

@@ -64,6 +64,7 @@ import {
 	resolveGitHubCopilotBaseUrl,
 } from "./github-copilot-headers";
 import { detectOpenAICompat, type ResolvedOpenAICompat, resolveOpenAICompat } from "./openai-completions-compat";
+import { createInitialResponsesAssistantMessage } from "./openai-responses-shared";
 import { transformMessages } from "./transform-messages";
 import { joinTextWithImagePlaceholder, NON_VISION_IMAGE_PLACEHOLDER } from "./vision-guard";
 
@@ -338,23 +339,7 @@ export const streamOpenAICompletions: StreamFunction<"openai-completions"> = (
 		let firstTokenTime: number | undefined;
 		let getCapturedErrorResponse: (() => CapturedHttpErrorResponse | undefined) | undefined;
 
-		const output: AssistantMessage = {
-			role: "assistant",
-			content: [],
-			api: model.api,
-			provider: model.provider,
-			model: model.id,
-			usage: {
-				input: 0,
-				output: 0,
-				cacheRead: 0,
-				cacheWrite: 0,
-				totalTokens: 0,
-				cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
-			},
-			stopReason: "stop",
-			timestamp: Date.now(),
-		};
+		const output: AssistantMessage = createInitialResponsesAssistantMessage(model.api, model.provider, model.id);
 		let rawRequestDump: RawHttpRequestDump | undefined;
 		const abortTracker = createAbortSourceTracker(options?.signal);
 		const firstEventTimeoutAbortError = new Error(OPENAI_COMPLETIONS_FIRST_EVENT_TIMEOUT_MESSAGE);

packages/ai/src/providers/openai-responses-shared.ts

@@ -12,17 +12,20 @@ import type {
 	ResponseReasoningItem,
 } from "openai/resources/responses/responses";
 import { calculateCost } from "../models";
-import type {
-	Api,
-	AssistantMessage,
-	ImageContent,
-	Model,
-	StopReason,
-	TextContent,
-	TextSignatureV1,
-	ThinkingContent,
-	ToolCall,
-	ToolResultMessage,
+import {
+	type Api,
+	type AssistantMessage,
+	type ImageContent,
+	type Model,
+	type ServiceTier,
+	type StopReason,
+	type StreamOptions,
+	shouldSendServiceTier,
+	type TextContent,
+	type TextSignatureV1,
+	type ThinkingContent,
+	type ToolCall,
+	type ToolResultMessage,
 } from "../types";
 import { normalizeResponsesToolCallId } from "../utils";
 import type { AssistantMessageEventStream } from "../utils/event-stream";
@@ -540,19 +543,7 @@ export async function processResponsesStream<TApi extends Api>(
 			if (response?.id) {
 				output.responseId = response.id;
 			}
-			if (response?.usage) {
-				const cachedTokens = response.usage.input_tokens_details?.cached_tokens || 0;
-				const reasoningTokens = response.usage.output_tokens_details?.reasoning_tokens || 0;
-				output.usage = {
-					input: (response.usage.input_tokens || 0) - cachedTokens,
-					output: response.usage.output_tokens || 0,
-					cacheRead: cachedTokens,
-					cacheWrite: 0,
-					totalTokens: response.usage.total_tokens || 0,
-					...(reasoningTokens > 0 ? { reasoningTokens } : {}),
-					cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
-				};
-			}
+			populateResponsesUsageFromResponse(output, response?.usage);
 			calculateCost(model, output.usage);
 			output.stopReason = mapOpenAIResponsesStopReason(response?.status);
 			if (response?.status === "failed" || response?.status === "cancelled") {
@@ -605,3 +596,131 @@ export function mapOpenAIResponsesStopReason(status: OpenAI.Responses.ResponseSt
 		}
 	}
 }
+
+/** Initial empty `AssistantMessage` that streaming providers accumulate into. */
+export function createInitialResponsesAssistantMessage(api: Api, provider: string, modelId: string): AssistantMessage {
+	return {
+		role: "assistant",
+		content: [],
+		api,
+		provider,
+		model: modelId,
+		usage: {
+			input: 0,
+			output: 0,
+			cacheRead: 0,
+			cacheWrite: 0,
+			totalTokens: 0,
+			cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+		},
+		stopReason: "stop",
+		timestamp: Date.now(),
+	};
+}
+
+/** Extension fields we add on top of `ResponseCreateParamsStreaming` across the Responses-family providers. */
+export type ResponsesSamplingParamsExtras = {
+	top_p?: number;
+	top_k?: number;
+	min_p?: number;
+	presence_penalty?: number;
+	repetition_penalty?: number;
+};
+
+type CommonResponsesParams = OpenAI.Responses.ResponseCreateParamsStreaming & ResponsesSamplingParamsExtras;
+
+type CommonSamplingOptions = Pick<
+	StreamOptions,
+	"temperature" | "topP" | "topK" | "minP" | "presencePenalty" | "repetitionPenalty" | "maxTokens"
+> & { serviceTier?: ServiceTier };
+
+/**
+ * Apply the common `StreamOptions` → Responses sampling-parameter mapping (max output tokens,
+ * temperature, top-p/k, min-p, presence/repetition penalties, service tier). Mutates `params`.
+ */
+export function applyCommonResponsesSamplingParams<P extends CommonResponsesParams>(
+	params: P,
+	options: CommonSamplingOptions | undefined,
+	provider: string,
+): void {
+	if (options?.maxTokens) params.max_output_tokens = options.maxTokens;
+	if (options?.temperature !== undefined) params.temperature = options.temperature;
+	if (options?.topP !== undefined) params.top_p = options.topP;
+	if (options?.topK !== undefined) params.top_k = options.topK;
+	if (options?.minP !== undefined) params.min_p = options.minP;
+	if (options?.presencePenalty !== undefined) params.presence_penalty = options.presencePenalty;
+	if (options?.repetitionPenalty !== undefined) params.repetition_penalty = options.repetitionPenalty;
+	if (shouldSendServiceTier(options?.serviceTier, provider)) {
+		params.service_tier = options.serviceTier;
+	}
+}
+
+type ReasoningOptions = {
+	reasoning?: string;
+	reasoningSummary?: "auto" | "detailed" | "concise" | null;
+};
+
+/**
+ * Apply reasoning-related Responses parameters: enable encrypted reasoning content for replay,
+ * set effort/summary when requested, and otherwise inject the GPT-5 "Juice: 0" no-reasoning hack.
+ * Mutates `params` and may push a developer message into `messages`.
+ */
+export function applyResponsesReasoningParams<P extends OpenAI.Responses.ResponseCreateParamsStreaming>(
+	params: P,
+	model: Model<Api>,
+	options: ReasoningOptions | undefined,
+	messages: ResponseInput,
+	mapEffort?: (effort: string) => string,
+): void {
+	if (!model.reasoning) return;
+	// Always request encrypted reasoning content so reasoning items can be replayed in
+	// multi-turn conversations when store is false (items aren't persisted server-side, so
+	// we must include the full content). See: https://github.com/can1357/oh-my-pi/issues/41
+	params.include = ["reasoning.encrypted_content"];
+
+	if (options?.reasoning || options?.reasoningSummary !== undefined) {
+		const requested = options?.reasoning || "medium";
+		type ReasoningParam = NonNullable<OpenAI.Responses.ResponseCreateParamsStreaming["reasoning"]>;
+		const reasoningParams: ReasoningParam = {
+			effort: (mapEffort ? mapEffort(requested) : requested) as ReasoningParam["effort"],
+		};
+		if (options?.reasoningSummary !== null) {
+			reasoningParams.summary = options?.reasoningSummary || "auto";
+		}
+		params.reasoning = reasoningParams as P["reasoning"];
+	} else if (model.name.toLowerCase().startsWith("gpt-5")) {
+		// Jesus Christ, see https://community.openai.com/t/need-reasoning-false-option-for-gpt-5/1351588/7
+		messages.push({
+			role: "developer",
+			content: [{ type: "input_text", text: "# Juice: 0 !important" }],
+		});
+	}
+}
+
+/** Populate `output.usage` from a Responses-API `response.usage` payload. Does not invoke `calculateCost`. */
+export function populateResponsesUsageFromResponse(
+	output: AssistantMessage,
+	usage:
+		| {
+				input_tokens?: number | null;
+				output_tokens?: number | null;
+				total_tokens?: number | null;
+				input_tokens_details?: { cached_tokens?: number | null } | null;
+				output_tokens_details?: { reasoning_tokens?: number | null } | null;
+		  }
+		| null
+		| undefined,
+): void {
+	if (!usage) return;
+	const cachedTokens = usage.input_tokens_details?.cached_tokens || 0;
+	const reasoningTokens = usage.output_tokens_details?.reasoning_tokens || 0;
+	output.usage = {
+		input: (usage.input_tokens || 0) - cachedTokens,
+		output: usage.output_tokens || 0,
+		cacheRead: cachedTokens,
+		cacheWrite: 0,
+		totalTokens: usage.total_tokens || 0,
+		...(reasoningTokens > 0 ? { reasoningTokens } : {}),
+		cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+	};
+}

packages/ai/src/providers/openai-responses.ts

@@ -7,7 +7,6 @@ import type {
 } from "openai/resources/responses/responses";
 import { getEnvApiKey } from "../stream";
 import {
-	type Api,
 	type AssistantMessage,
 	type CacheRetention,
 	type Context,
@@ -19,7 +18,6 @@ import {
 	type ServiceTier,
 	type StreamFunction,
 	type StreamOptions,
-	shouldSendServiceTier,
 	type Tool,
 	type ToolChoice,
 } from "../types";
@@ -54,10 +52,13 @@ import {
 import { compactGrammarDefinition } from "./grammar";
 import {
 	appendResponsesToolResultMessages,
+	applyCommonResponsesSamplingParams,
+	applyResponsesReasoningParams,
 	collectCustomCallIds,
 	collectKnownCallIds,
 	convertResponsesAssistantMessage,
 	convertResponsesInputContent,
+	createInitialResponsesAssistantMessage,
 	normalizeResponsesToolCallIdForTransform,
 	processResponsesStream,
 } from "./openai-responses-shared";
@@ -187,23 +188,11 @@ export const streamOpenAIResponses: StreamFunction<"openai-responses"> = (
 		const startTime = Date.now();
 		let firstTokenTime: number | undefined;
 
-		const output: AssistantMessage = {
-			role: "assistant",
-			content: [],
-			api: "openai-responses" as Api,
-			provider: model.provider,
-			model: model.id,
-			usage: {
-				input: 0,
-				output: 0,
-				cacheRead: 0,
-				cacheWrite: 0,
-				totalTokens: 0,
-				cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
-			},
-			stopReason: "stop",
-			timestamp: Date.now(),
-		};
+		const output: AssistantMessage = createInitialResponsesAssistantMessage(
+			"openai-responses",
+			model.provider,
+			model.id,
+		);
 		let rawRequestDump: RawHttpRequestDump | undefined;
 		const abortTracker = createAbortSourceTracker(options?.signal);
 		const firstEventTimeoutAbortError = new Error(OPENAI_RESPONSES_FIRST_EVENT_TIMEOUT_MESSAGE);
@@ -418,31 +407,7 @@ function buildParams(
 		store: false,
 	};
 
-	if (options?.maxTokens) {
-		params.max_output_tokens = options?.maxTokens;
-	}
-
-	if (options?.temperature !== undefined) {
-		params.temperature = options?.temperature;
-	}
-	if (options?.topP !== undefined) {
-		params.top_p = options.topP;
-	}
-	if (options?.topK !== undefined) {
-		params.top_k = options.topK;
-	}
-	if (options?.minP !== undefined) {
-		params.min_p = options.minP;
-	}
-	if (options?.presencePenalty !== undefined) {
-		params.presence_penalty = options.presencePenalty;
-	}
-	if (options?.repetitionPenalty !== undefined) {
-		params.repetition_penalty = options.repetitionPenalty;
-	}
-	if (shouldSendServiceTier(options?.serviceTier, model.provider)) {
-		params.service_tier = options.serviceTier;
-	}
+	applyCommonResponsesSamplingParams(params, options, model.provider);
 
 	if (context.tools) {
 		params.tools = convertTools(context.tools, supportsStrictMode(model), model);
@@ -460,36 +425,9 @@ function buildParams(
 		}
 	}
 
-	if (model.reasoning) {
-		// Always request encrypted reasoning content so reasoning items can be
-		// replayed in multi-turn conversations when store is false (items aren't
-		// persisted server-side, so we must include the full content).
-		// See: https://github.com/can1357/oh-my-pi/issues/41
-		params.include = ["reasoning.encrypted_content"];
-
-		if (options?.reasoning || options?.reasoningSummary !== undefined) {
-			const reasoningParams: NonNullable<typeof params.reasoning> = {
-				effort: mapReasoningEffort(options?.reasoning || "medium", model.compat?.reasoningEffortMap) as NonNullable<
-					OpenAIResponsesSamplingParams["reasoning"]
-				>["effort"],
-			};
-			if (options?.reasoningSummary !== null) {
-				reasoningParams.summary = options?.reasoningSummary || "auto";
-			}
-			params.reasoning = reasoningParams;
-		} else if (model.name.startsWith("gpt-5")) {
-			// Jesus Christ, see https://community.openai.com/t/need-reasoning-false-option-for-gpt-5/1351588/7
-			messages.push({
-				role: "developer",
-				content: [
-					{
-						type: "input_text",
-						text: "# Juice: 0 !important",
-					},
-				],
-			});
-		}
-	}
+	applyResponsesReasoningParams(params, model, options, messages, effort =>
+		mapReasoningEffort(effort as NonNullable<OpenAIResponsesOptions["reasoning"]>, model.compat?.reasoningEffortMap),
+	);
 
 	return { conversationMessages, params };
 }

packages/ai/src/providers/synthetic.ts

@@ -8,18 +8,20 @@
  * @see https://dev.synthetic.new/docs/api/overview
  */
 
-import { ANTHROPIC_THINKING } from "../stream";
-import type { Api, Context, Model, SimpleStreamOptions } from "../types";
-import { AssistantMessageEventStream } from "../utils/event-stream";
-import { streamAnthropic, streamOpenAICompletions } from "./register-builtins";
-import { createProviderErrorMessage } from "./shared/error-message";
+import type { Api, Context, Model } from "../types";
+import type { AssistantMessageEventStream } from "../utils/event-stream";
+import {
+	type OpenAIAnthropicApiFormat,
+	type OpenAIAnthropicShimOptions,
+	streamOpenAIAnthropicShim,
+} from "./openai-anthropic-shim";
 
-export type SyntheticApiFormat = "openai" | "anthropic";
+export type SyntheticApiFormat = OpenAIAnthropicApiFormat;
 
 const SYNTHETIC_NEW_BASE_URL = "https://api.synthetic.new/openai/v1";
 const SYNTHETIC_NEW_ANTHROPIC_BASE_URL = "https://api.synthetic.new/anthropic";
 
-export interface SyntheticOptions extends SimpleStreamOptions {
+export interface SyntheticOptions extends OpenAIAnthropicShimOptions {
 	/** API format: "openai" or "anthropic". Default: "openai" */
 	format?: SyntheticApiFormat;
 }
@@ -33,102 +35,13 @@ export function streamSynthetic(
 	context: Context,
 	options?: SyntheticOptions,
 ): AssistantMessageEventStream {
-	const stream = new AssistantMessageEventStream();
-	const format = options?.format ?? "openai";
-
-	// Async IIFE to handle stream piping
-	(async () => {
-		try {
-			const mergedHeaders = options?.headers ?? {};
-
-			if (format === "anthropic") {
-				// Create a synthetic Anthropic model pointing to Synthetic's endpoint
-				const anthropicModel: Model<"anthropic-messages"> = {
-					id: model.id,
-					name: model.name,
-					api: "anthropic-messages",
-					provider: model.provider,
-					baseUrl: SYNTHETIC_NEW_ANTHROPIC_BASE_URL,
-					headers: mergedHeaders,
-					contextWindow: model.contextWindow,
-					maxTokens: model.maxTokens,
-					reasoning: model.reasoning,
-					input: model.input,
-					cost: model.cost,
-				};
-
-				// Calculate thinking budget from reasoning level
-				const reasoning = options?.reasoning;
-				const reasoningEffort = reasoning;
-				const thinkingEnabled = !!reasoningEffort && model.reasoning;
-				const thinkingBudget = reasoningEffort
-					? (options?.thinkingBudgets?.[reasoningEffort] ?? ANTHROPIC_THINKING[reasoningEffort])
-					: undefined;
-
-				const innerStream = streamAnthropic(anthropicModel, context, {
-					apiKey: options?.apiKey,
-					temperature: options?.temperature,
-					topP: options?.topP,
-					topK: options?.topK,
-					minP: options?.minP,
-					presencePenalty: options?.presencePenalty,
-					repetitionPenalty: options?.repetitionPenalty,
-					maxTokens: options?.maxTokens ?? Math.min(model.maxTokens, 32000),
-					signal: options?.signal,
-					headers: mergedHeaders,
-					sessionId: options?.sessionId,
-					onPayload: options?.onPayload,
-					onResponse: options?.onResponse,
-					onSseEvent: options?.onSseEvent,
-					thinkingEnabled,
-					thinkingBudgetTokens: thinkingBudget,
+	return streamOpenAIAnthropicShim(model, context, options, {
+		anthropicBaseUrl: SYNTHETIC_NEW_ANTHROPIC_BASE_URL,
+		openaiBaseUrl: SYNTHETIC_NEW_BASE_URL,
+		defaultFormat: "openai",
 	});
-
-				for await (const event of innerStream) {
-					stream.push(event);
-				}
-			} else {
-				// OpenAI format - use original model with Synthetic headers
-				const syntheticModel: Model<"openai-completions"> = {
-					...model,
-					baseUrl: SYNTHETIC_NEW_BASE_URL,
-					headers: mergedHeaders,
-				};
-
-				const reasoningEffort = options?.reasoning;
-				const innerStream = streamOpenAICompletions(syntheticModel, context, {
-					apiKey: options?.apiKey,
-					temperature: options?.temperature,
-					topP: options?.topP,
-					topK: options?.topK,
-					minP: options?.minP,
-					presencePenalty: options?.presencePenalty,
-					repetitionPenalty: options?.repetitionPenalty,
-					maxTokens: options?.maxTokens ?? model.maxTokens,
-					signal: options?.signal,
-					headers: mergedHeaders,
-					sessionId: options?.sessionId,
-					onPayload: options?.onPayload,
-					onResponse: options?.onResponse,
-					onSseEvent: options?.onSseEvent,
-					reasoning: reasoningEffort,
-				});
-
-				for await (const event of innerStream) {
-					stream.push(event);
-				}
-			}
-		} catch (err) {
-			stream.push({
-				type: "error",
-				reason: "error",
-				error: createProviderErrorMessage(model, err),
-			});
-		}
-	})();
-
-	return stream;
 }
+
 /**
  * Check if a model is a Synthetic model.
  */

packages/ai/src/types.ts

@@ -64,7 +64,7 @@ type _CheckExhaustive =
 			? true
 			: ["ApiOptionsMap is missing some KnownApi values", Exclude<KnownApi, keyof ApiOptionsMap>]
 		: ["ApiOptionsMap doesn't extend Record<KnownApi, StreamOptions>"];
-const _exhaustive: _CheckExhaustive = true;
+true satisfies _CheckExhaustive;
 export type OptionsForApi<TApi extends Api> =
 	| StreamOptions
 	| (TApi extends keyof ApiOptionsMap ? ApiOptionsMap[TApi] : never);

packages/ai/src/utils/oauth/lm-studio.ts

@@ -10,8 +10,6 @@
 import type { OAuthController, OAuthProvider } from "./types";
 
 const PROVIDER_ID: OAuthProvider = "lm-studio";
-const _AUTH_URL = "https://lmstudio.ai/docs/api";
-const _DEFAULT_LOCAL_BASE_URL = "http://127.0.0.1:1234/v1";
 export const DEFAULT_LOCAL_TOKEN = "lm-studio-local";
 
 /**

packages/ai/test/anthropic-stream-envelope.test.ts

@@ -470,7 +470,7 @@ describe("anthropic stream envelope handling", () => {
 		vi.spyOn(Messages.prototype, "create").mockImplementation(() => createRawSseRequest(frames) as never);
 
 		const stream = streamAnthropic(model, context, { apiKey: "sk-ant-test" });
-		for await (const _event of stream) {
+		for await (const _ of stream) {
 			// drain stream
 		}
 		const result = await stream.result();
@@ -497,7 +497,7 @@ describe("anthropic stream envelope handling", () => {
 		});
 
 		const eagerStream = streamAnthropic(model, toolContext, { apiKey: "sk-ant-test" });
-		for await (const _event of eagerStream) {
+		for await (const _ of eagerStream) {
 			// drain stream
 		}
 		await eagerStream.result();
@@ -507,7 +507,7 @@ describe("anthropic stream envelope handling", () => {
 			toolContext,
 			{ apiKey: "sk-ant-test" },
 		);
-		for await (const _event of disabledStream) {
+		for await (const _ of disabledStream) {
 			// drain stream
 		}
 		await disabledStream.result();
@@ -534,7 +534,7 @@ describe("anthropic stream envelope handling", () => {
 				apiKey: "sk-ant-test",
 				cacheRetention: "long",
 			});
-			for await (const _event of stream) {
+			for await (const _ of stream) {
 				// drain stream
 			}
 			await stream.result();

packages/ai/test/github-copilot-login.test.ts

@@ -227,7 +227,6 @@ describe("loginGitHubCopilot", () => {
 	});
 
 	it("device flow error", async () => {
-		let _pollCount = 0;
 		const fetchMock = vi.fn(async (input: string | URL) => {
 			const url = typeof input === "string" ? input : input.toString();
 			if (url === "https://github.com/login/device/code") {
@@ -237,7 +236,6 @@ describe("loginGitHubCopilot", () => {
 				});
 			}
 			if (url === "https://github.com/login/oauth/access_token") {
-				_pollCount++;
 				return new Response(JSON.stringify({ error: "access_denied", error_description: "User denied" }), {
 					status: 200,
 					headers: { "Content-Type": "application/json" },

packages/ai/test/oauth.ts

@@ -16,7 +16,7 @@ import { $flag, getAgentDir, isEnoent } from "@oh-my-pi/pi-utils";
  * E2E tests require explicit opt-in via E2E=1 environment variable.
  * This prevents accidental API calls when keys happen to be in the environment.
  */
-export const E2E_ENABLED = $flag("E2E");
+const E2E_ENABLED = $flag("E2E");
 
 /**
  * Get an API key from environment, but only if E2E tests are enabled.

packages/ai/test/stream.test.ts

@@ -501,7 +501,7 @@ describe("Generate E2E Tests", () => {
 			);
 
 			const drain = (async () => {
-				for await (const _event of events) {
+				for await (const _ of events) {
 				}
 			})();
 

packages/coding-agent/examples/extensions/plan-mode.ts

@@ -334,7 +334,6 @@ export default function planModeExtension(pi: ExtensionAPI) {
 		}
 
 		// Remove any previous plan-mode-context messages
-		const _beforeCount = event.messages.length;
 		const filtered = event.messages.filter(m => {
 			if (m.role === "user" && Array.isArray(m.content)) {
 				const hasOldContext = m.content.some(

packages/coding-agent/src/autoresearch/helpers.ts

@@ -1,3 +1,4 @@
+import * as git from "../utils/git";
 import type { ASIData, ASIValue, MetricDirection, NumericMetricMap } from "./types";
 
 export const METRIC_LINE_PREFIX = "METRIC";
@@ -199,3 +200,19 @@ function sanitizeAsiValue(value: unknown): ASIValue | undefined {
 	}
 	return undefined;
 }
+
+export async function tryGitStatus(cwd: string): Promise<string> {
+	try {
+		return await git.status(cwd, { porcelainV1: true, untrackedFiles: "all", z: true });
+	} catch {
+		return "";
+	}
+}
+
+export async function tryGitPrefix(cwd: string): Promise<string> {
+	try {
+		return await git.show.prefix(cwd);
+	} catch {
+		return "";
+	}
+}

packages/coding-agent/src/autoresearch/tools/log-experiment.ts

@@ -8,7 +8,15 @@ import type { Theme } from "../../modes/theme/theme";
 import { replaceTabs, truncateToWidth } from "../../tools/render-utils";
 import * as git from "../../utils/git";
 import { computeRunModifiedPaths, getCurrentAutoresearchBranch, parseWorkDirDirtyPaths } from "../git";
-import { ensureNumericMetricMap, formatNum, mergeAsi, pathMatchesSpec, sanitizeAsi } from "../helpers";
+import {
+	ensureNumericMetricMap,
+	formatNum,
+	mergeAsi,
+	pathMatchesSpec,
+	sanitizeAsi,
+	tryGitPrefix,
+	tryGitStatus,
+} from "../helpers";
 import {
 	buildExperimentState,
 	computeConfidence,
@@ -445,22 +453,6 @@ async function tryReadHeadSha(cwd: string): Promise<string | null> {
 	}
 }
 
-async function tryGitStatus(cwd: string): Promise<string> {
-	try {
-		return await git.status(cwd, { porcelainV1: true, untrackedFiles: "all", z: true });
-	} catch {
-		return "";
-	}
-}
-
-async function tryGitPrefix(cwd: string): Promise<string> {
-	try {
-		return await git.show.prefix(cwd);
-	} catch {
-		return "";
-	}
-}
-
 function buildLogText(
 	state: ExperimentState,
 	experiment: ExperimentResult,

packages/coding-agent/src/autoresearch/tools/run-experiment.ts

@@ -18,6 +18,8 @@ import {
 	killTree,
 	parseAsiLines,
 	parseMetricLines,
+	tryGitPrefix,
+	tryGitStatus,
 } from "../helpers";
 import { buildExperimentState } from "../state";
 import { openAutoresearchStorageIfExists } from "../storage";
@@ -265,23 +267,6 @@ export function createRunExperimentTool(
 		},
 	};
 }
-
-async function tryGitStatus(cwd: string): Promise<string> {
-	try {
-		return await git.status(cwd, { porcelainV1: true, untrackedFiles: "all", z: true });
-	} catch {
-		return "";
-	}
-}
-
-async function tryGitPrefix(cwd: string): Promise<string> {
-	try {
-		return await git.show.prefix(cwd);
-	} catch {
-		return "";
-	}
-}
-
 async function executeProcess(opts: {
 	command: string[];
 	cwd: string;

packages/coding-agent/src/cli/list-models.ts

@@ -2,11 +2,11 @@
  * List available models with optional fuzzy search
  */
 import { type Api, getSupportedEfforts, type Model } from "@oh-my-pi/pi-ai";
+import { fuzzyFilter } from "@oh-my-pi/pi-tui";
 import { formatNumber } from "@oh-my-pi/pi-utils";
 import type { ModelRegistry } from "../config/model-registry";
 import { discoverAndLoadExtensions, loadExtensions } from "../extensibility/extensions";
 import { EventBus } from "../utils/event-bus";
-import { fuzzyFilter } from "../utils/fuzzy";
 
 interface ProviderRow {
 	provider: string;

packages/coding-agent/src/cli/shell-cli.ts

@@ -5,10 +5,11 @@
  */
 import * as path from "node:path";
 import { createInterface } from "node:readline/promises";
-import { type MinimizerOptions, Shell } from "@oh-my-pi/pi-natives";
+import { Shell } from "@oh-my-pi/pi-natives";
 import { APP_NAME, getProjectDir } from "@oh-my-pi/pi-utils";
 import chalk from "chalk";
-import { Settings, type ShellMinimizerSettings } from "../config/settings";
+import { Settings } from "../config/settings";
+import { buildMinimizerOptions } from "../exec/bash-executor";
 import { getOrCreateSnapshot } from "../utils/shell-snapshot";
 
 export interface ShellCommandArgs {
@@ -41,17 +42,6 @@ export function parseShellArgs(args: string[]): ShellCommandArgs | undefined {
 	return result;
 }
 
-function buildMinimizerOptions(group: ShellMinimizerSettings): MinimizerOptions | undefined {
-	if (!group.enabled) return undefined;
-	return {
-		enabled: true,
-		settingsPath: group.settingsPath || undefined,
-		only: group.only.length > 0 ? group.only : undefined,
-		except: group.except.length > 0 ? group.except : undefined,
-		maxCaptureBytes: group.maxCaptureBytes,
-	};
-}
-
 export async function runShellCommand(cmd: ShellCommandArgs): Promise<void> {
 	if (!process.stdin.isTTY) {
 		process.stderr.write("Error: shell console requires an interactive TTY.\n");

packages/coding-agent/src/cli/update-cli.ts

@@ -91,7 +91,7 @@ function resolveUpdateMethod(ompPath: string, bunBinDir: string | undefined): "b
 	return isPathInDirectory(ompPath, bunBinDir) ? "bun" : "binary";
 }
 
-export function _resolveUpdateMethodForTest(ompPath: string, bunBinDir: string | undefined): "bun" | "binary" {
+export function resolveUpdateMethodForTest(ompPath: string, bunBinDir: string | undefined): "bun" | "binary" {
 	return resolveUpdateMethod(ompPath, bunBinDir);
 }
 async function resolveUpdateTarget(): Promise<UpdateTarget> {

packages/coding-agent/src/commit/analysis/conventional.ts

@@ -1,52 +1,16 @@
 import type { ThinkingLevel } from "@oh-my-pi/pi-agent-core";
-import type { Api, AssistantMessage, Model } from "@oh-my-pi/pi-ai";
-import { completeSimple, validateToolCall } from "@oh-my-pi/pi-ai";
+import type { Api, Model } from "@oh-my-pi/pi-ai";
+import { completeSimple } from "@oh-my-pi/pi-ai";
 import { prompt } from "@oh-my-pi/pi-utils";
-import { Type } from "@sinclair/typebox";
 import analysisSystemPrompt from "../../commit/prompts/analysis-system.md" with { type: "text" };
 import analysisUserPrompt from "../../commit/prompts/analysis-user.md" with { type: "text" };
-import type { ChangelogCategory, ConventionalAnalysis } from "../../commit/types";
+import type { ConventionalAnalysis } from "../../commit/types";
 import { toReasoningEffort } from "../../thinking";
-import { extractTextContent, extractToolCall, normalizeAnalysis, parseJsonPayload } from "../utils";
+import { createConventionalAnalysisTool, parseConventionalAnalysisResponse } from "../shared-llm";
 
-const ConventionalAnalysisTool = {
-	name: "create_conventional_analysis",
-	description: "Analyze a diff and return conventional commit classification.",
-	parameters: Type.Object({
-		type: Type.Union([
-			Type.Literal("feat"),
-			Type.Literal("fix"),
-			Type.Literal("refactor"),
-			Type.Literal("docs"),
-			Type.Literal("test"),
-			Type.Literal("chore"),
-			Type.Literal("style"),
-			Type.Literal("perf"),
-			Type.Literal("build"),
-			Type.Literal("ci"),
-			Type.Literal("revert"),
-		]),
-		scope: Type.Union([Type.String(), Type.Null()]),
-		details: Type.Array(
-			Type.Object({
-				text: Type.String(),
-				changelog_category: Type.Optional(
-					Type.Union([
-						Type.Literal("Added"),
-						Type.Literal("Changed"),
-						Type.Literal("Fixed"),
-						Type.Literal("Deprecated"),
-						Type.Literal("Removed"),
-						Type.Literal("Security"),
-						Type.Literal("Breaking Changes"),
-					]),
-				),
-				user_visible: Type.Optional(Type.Boolean()),
-			}),
-		),
-		issue_refs: Type.Array(Type.String()),
-	}),
-};
+const ConventionalAnalysisTool = createConventionalAnalysisTool(
+	"Analyze a diff and return conventional commit classification.",
+);
 
 export interface ConventionalAnalysisInput {
 	model: Model<Api>;
@@ -96,27 +60,5 @@ export async function generateConventionalAnalysis({
 		{ apiKey, maxTokens: 2400, reasoning: toReasoningEffort(thinkingLevel) },
 	);
 
-	return parseAnalysisFromResponse(response);
-}
-
-function parseAnalysisFromResponse(message: AssistantMessage): ConventionalAnalysis {
-	const toolCall = extractToolCall(message, "create_conventional_analysis");
-	if (toolCall) {
-		const parsed = validateToolCall([ConventionalAnalysisTool], toolCall) as {
-			type: ConventionalAnalysis["type"];
-			scope: string | null;
-			details: Array<{ text: string; changelog_category?: ChangelogCategory; user_visible?: boolean }>;
-			issue_refs: string[];
-		};
-		return normalizeAnalysis(parsed);
-	}
-
-	const text = extractTextContent(message);
-	const parsed = parseJsonPayload(text) as {
-		type: ConventionalAnalysis["type"];
-		scope: string | null;
-		details: Array<{ text: string; changelog_category?: ChangelogCategory; user_visible?: boolean }>;
-		issue_refs: string[];
-	};
-	return normalizeAnalysis(parsed);
+	return parseConventionalAnalysisResponse(response, ConventionalAnalysisTool);
 }

packages/coding-agent/src/commit/map-reduce/reduce-phase.ts

@@ -1,52 +1,14 @@
 import type { ThinkingLevel } from "@oh-my-pi/pi-agent-core";
-import type { Api, AssistantMessage, Model } from "@oh-my-pi/pi-ai";
-import { completeSimple, validateToolCall } from "@oh-my-pi/pi-ai";
+import type { Api, Model } from "@oh-my-pi/pi-ai";
+import { completeSimple } from "@oh-my-pi/pi-ai";
 import { prompt } from "@oh-my-pi/pi-utils";
-import { Type } from "@sinclair/typebox";
 import reduceSystemPrompt from "../../commit/prompts/reduce-system.md" with { type: "text" };
 import reduceUserPrompt from "../../commit/prompts/reduce-user.md" with { type: "text" };
-import type { ChangelogCategory, ConventionalAnalysis, FileObservation } from "../../commit/types";
+import type { ConventionalAnalysis, FileObservation } from "../../commit/types";
 import { toReasoningEffort } from "../../thinking";
-import { extractTextContent, extractToolCall, normalizeAnalysis, parseJsonPayload } from "../utils";
+import { createConventionalAnalysisTool, parseConventionalAnalysisResponse } from "../shared-llm";
 
-const ReduceTool = {
-	name: "create_conventional_analysis",
-	description: "Synthesize file observations into a conventional commit analysis.",
-	parameters: Type.Object({
-		type: Type.Union([
-			Type.Literal("feat"),
-			Type.Literal("fix"),
-			Type.Literal("refactor"),
-			Type.Literal("docs"),
-			Type.Literal("test"),
-			Type.Literal("chore"),
-			Type.Literal("style"),
-			Type.Literal("perf"),
-			Type.Literal("build"),
-			Type.Literal("ci"),
-			Type.Literal("revert"),
-		]),
-		scope: Type.Union([Type.String(), Type.Null()]),
-		details: Type.Array(
-			Type.Object({
-				text: Type.String(),
-				changelog_category: Type.Optional(
-					Type.Union([
-						Type.Literal("Added"),
-						Type.Literal("Changed"),
-						Type.Literal("Fixed"),
-						Type.Literal("Deprecated"),
-						Type.Literal("Removed"),
-						Type.Literal("Security"),
-						Type.Literal("Breaking Changes"),
-					]),
-				),
-				user_visible: Type.Optional(Type.Boolean()),
-			}),
-		),
-		issue_refs: Type.Array(Type.String()),
-	}),
-};
+const ReduceTool = createConventionalAnalysisTool("Synthesize file observations into a conventional commit analysis.");
 
 export interface ReducePhaseInput {
 	model: Model<Api>;
@@ -83,26 +45,5 @@ export async function runReducePhase({
 		{ apiKey, maxTokens: 2400, reasoning: toReasoningEffort(thinkingLevel) },
 	);
 
-	return parseAnalysisResponse(response);
-}
-
-function parseAnalysisResponse(message: AssistantMessage): ConventionalAnalysis {
-	const toolCall = extractToolCall(message, "create_conventional_analysis");
-	if (toolCall) {
-		const parsed = validateToolCall([ReduceTool], toolCall) as {
-			type: ConventionalAnalysis["type"];
-			scope: string | null;
-			details: Array<{ text: string; changelog_category?: ChangelogCategory; user_visible?: boolean }>;
-			issue_refs: string[];
-		};
-		return normalizeAnalysis(parsed);
-	}
-	const text = extractTextContent(message);
-	const parsed = parseJsonPayload(text) as {
-		type: ConventionalAnalysis["type"];
-		scope: string | null;
-		details: Array<{ text: string; changelog_category?: ChangelogCategory; user_visible?: boolean }>;
-		issue_refs: string[];
-	};
-	return normalizeAnalysis(parsed);
+	return parseConventionalAnalysisResponse(response, ReduceTool);
 }

packages/coding-agent/src/commit/pipeline.ts

@@ -25,8 +25,8 @@ import type { CommitCommandArgs, ConventionalAnalysis } from "./types";
 
 const SUMMARY_MAX_CHARS = 72;
 const RECENT_COMMITS_COUNT = 8;
-let _typesDescription: string | undefined;
-const TYPES_DESCRIPTION = (): string => (_typesDescription ??= prompt.render(typesDescriptionPrompt));
+let typesDescription: string | undefined;
+const TYPES_DESCRIPTION = (): string => (typesDescription ??= prompt.render(typesDescriptionPrompt));
 
 /**
  * Execute the omp commit pipeline for staged changes.

packages/coding-agent/src/commit/shared-llm.ts

@@ -0,0 +1,89 @@
+import type { AssistantMessage } from "@oh-my-pi/pi-ai";
+import { validateToolCall } from "@oh-my-pi/pi-ai";
+import { Type } from "@sinclair/typebox";
+import type { ChangelogCategory, ConventionalAnalysis } from "./types";
+import { extractTextContent, extractToolCall, normalizeAnalysis, parseJsonPayload } from "./utils";
+
+/**
+ * Shared TypeBox schema for the `create_conventional_analysis` tool used by
+ * both the single-pass analysis call and the map-reduce reduce phase. Schemas
+ * are identical across phases — only the surrounding tool `description`
+ * differs to reflect the input the phase is summarizing.
+ */
+export const conventionalAnalysisParameters = Type.Object({
+	type: Type.Union([
+		Type.Literal("feat"),
+		Type.Literal("fix"),
+		Type.Literal("refactor"),
+		Type.Literal("docs"),
+		Type.Literal("test"),
+		Type.Literal("chore"),
+		Type.Literal("style"),
+		Type.Literal("perf"),
+		Type.Literal("build"),
+		Type.Literal("ci"),
+		Type.Literal("revert"),
+	]),
+	scope: Type.Union([Type.String(), Type.Null()]),
+	details: Type.Array(
+		Type.Object({
+			text: Type.String(),
+			changelog_category: Type.Optional(
+				Type.Union([
+					Type.Literal("Added"),
+					Type.Literal("Changed"),
+					Type.Literal("Fixed"),
+					Type.Literal("Deprecated"),
+					Type.Literal("Removed"),
+					Type.Literal("Security"),
+					Type.Literal("Breaking Changes"),
+				]),
+			),
+			user_visible: Type.Optional(Type.Boolean()),
+		}),
+	),
+	issue_refs: Type.Array(Type.String()),
+});
+
+export interface ConventionalAnalysisTool {
+	name: "create_conventional_analysis";
+	description: string;
+	parameters: typeof conventionalAnalysisParameters;
+}
+
+/**
+ * Build a `create_conventional_analysis` tool descriptor. Phase-specific
+ * `description` text is the only thing that varies between callers.
+ */
+export function createConventionalAnalysisTool(description: string): ConventionalAnalysisTool {
+	return {
+		name: "create_conventional_analysis",
+		description,
+		parameters: conventionalAnalysisParameters,
+	};
+}
+
+interface ParsedConventionalAnalysis {
+	type: ConventionalAnalysis["type"];
+	scope: string | null;
+	details: Array<{ text: string; changelog_category?: ChangelogCategory; user_visible?: boolean }>;
+	issue_refs: string[];
+}
+
+/**
+ * Extract a {@link ConventionalAnalysis} from an assistant response, preferring
+ * a structured tool call and falling back to JSON embedded in text content.
+ */
+export function parseConventionalAnalysisResponse(
+	message: AssistantMessage,
+	tool: ConventionalAnalysisTool,
+): ConventionalAnalysis {
+	const toolCall = extractToolCall(message, tool.name);
+	if (toolCall) {
+		const parsed = validateToolCall([tool], toolCall) as ParsedConventionalAnalysis;
+		return normalizeAnalysis(parsed);
+	}
+	const text = extractTextContent(message);
+	const parsed = parseJsonPayload(text) as ParsedConventionalAnalysis;
+	return normalizeAnalysis(parsed);
+}

packages/coding-agent/src/config/model-equivalence.ts

@@ -72,15 +72,12 @@ const TRAILING_MARKER_SUFFIXES: readonly string[] = (() => {
 })();
 const WRAPPER_PREFIXES = ["duo-chat-"] as const;
 
-let __referenceDataCache: CanonicalReferenceData | undefined;
+let referenceDataCache: CanonicalReferenceData | undefined;
 const EMPTY_COMPILED_EQUIVALENCE: CompiledEquivalenceConfig = {
 	overrides: new Map<string, string>(),
 	exclude: new Set<string>(),
 };
-const __resolutionCache: WeakMap<
-	CompiledEquivalenceConfig,
-	WeakMap<Model<Api>, ResolvedCanonicalModel>
-> = new WeakMap();
+const resolutionCache: WeakMap<CompiledEquivalenceConfig, WeakMap<Model<Api>, ResolvedCanonicalModel>> = new WeakMap();
 const FAMILY_EXTRACTION_PATTERNS = [
 	/(?:^|[/:._-])((?:claude|gemini|gpt|grok|glm|qwen|minimax|kimi|deepseek|llama|gemma|nova|mistral|ministral|pixtral|codestral|devstral|magistral|ernie|doubao|seed|aion|olmo|molmo|nemotron|palmyra|command|codex|coder|o[1345])[-a-z0-9.]+)(?::|$)/i,
 	/(?:^|[/:._-])((?:claude|gemini|gpt|grok|glm|qwen|minimax|kimi|deepseek|llama|gemma|nova|mistral|ministral|pixtral|codestral|devstral|magistral|ernie|doubao|seed|aion|olmo|molmo|nemotron|palmyra|command|codex|coder|o[1345])[-a-z0-9.]+(?:[-_/][a-z0-9.]+)*)(?::|$)/i,
@@ -98,8 +95,8 @@ function shouldReplaceReference(existing: Model<Api> | undefined, candidate: Mod
 }
 
 function createCanonicalReferenceData(): CanonicalReferenceData {
-	if (__referenceDataCache) {
-		return __referenceDataCache;
+	if (referenceDataCache) {
+		return referenceDataCache;
 	}
 	const references = new Map<string, Model<Api>>();
 	for (const provider of getBundledProviders()) {
@@ -112,11 +109,11 @@ function createCanonicalReferenceData(): CanonicalReferenceData {
 		}
 	}
 	const officialIds = new Set(references.keys());
-	__referenceDataCache = {
+	referenceDataCache = {
 		references: Object.freeze(references) as Map<string, Model<Api>>,
 		officialIds: Object.freeze(officialIds) as Set<string>,
 	};
-	return __referenceDataCache;
+	return referenceDataCache;
 }
 
 function normalizeSelectorKey(selector: string): string {
@@ -668,10 +665,10 @@ export function buildCanonicalModelIndex(
 	const byId = new Map<string, CanonicalModelRecord>();
 	const bySelector = new Map<string, string>();
 
-	let modelCache = __resolutionCache.get(compiledEquivalence);
+	let modelCache = resolutionCache.get(compiledEquivalence);
 	if (!modelCache) {
 		modelCache = new WeakMap<Model<Api>, ResolvedCanonicalModel>();
-		__resolutionCache.set(compiledEquivalence, modelCache);
+		resolutionCache.set(compiledEquivalence, modelCache);
 	}
 
 	for (const model of models) {

packages/coding-agent/src/config/model-resolver.ts

@@ -12,10 +12,10 @@ import {
 	type Model,
 	modelsAreEqual,
 } from "@oh-my-pi/pi-ai";
+import { fuzzyMatch } from "@oh-my-pi/pi-tui";
 import chalk from "chalk";
 import MODEL_PRIO from "../priority.json" with { type: "json" };
 import { parseThinkingLevel, resolveThinkingLevelForModel } from "../thinking";
-import { fuzzyMatch } from "../utils/fuzzy";
 import { isAuthenticated, kNoAuth, MODEL_ROLE_IDS, type ModelRegistry, type ModelRole } from "./model-registry";
 import type { Settings } from "./settings";
 
@@ -607,9 +607,6 @@ export function resolveModelRoleValue(
 		return { model: undefined, thinkingLevel: undefined, explicitThinkingLevel: false, warning: undefined };
 	}
 
-	const lastColonIndex = normalized.lastIndexOf(":");
-	const _thinkingSelector =
-		lastColonIndex > PREFIX_MODEL_ROLE.length ? parseThinkingLevel(normalized.slice(lastColonIndex + 1)) : undefined;
 	const effectivePatterns = resolveConfiguredRolePattern(normalized, options?.settings);
 	if (!effectivePatterns || effectivePatterns.length === 0) {
 		return { model: undefined, thinkingLevel: undefined, explicitThinkingLevel: false, warning: undefined };

packages/coding-agent/src/config/settings.ts

@@ -850,7 +850,7 @@ export function isSettingsInitialized(): boolean {
  * Reset the global singleton for testing.
  * @internal
  */
-export function _resetSettingsForTest(): void {
+export function resetSettingsForTest(): void {
 	globalInstance = null;
 	globalInstancePromise = null;
 }

packages/coding-agent/src/eval/js/shared/rewrite-imports.ts

@@ -180,7 +180,7 @@ export function rewriteImports(code: string): string {
  * Nested declarations (inside functions, blocks, classes) are left alone \u2014 they're
  * scoped to their enclosing function/block regardless of `var` vs `let`/`const`.
  */
-export function demoteTopLevelLexicals(code: string): string {
+function demoteTopLevelLexicals(code: string): string {
 	if (!/\b(?:const|let|class)\b/.test(code)) return code;
 
 	const ast = parseProgram(code);
@@ -248,7 +248,7 @@ function returnFinalExpression(code: string): { source: string; returned: boolea
  * common case avoids an extra transpile pass. We detect "looks like TS" with a cheap regex
  * before invoking the transpiler.
  */
-export function stripTypeScript(code: string): string {
+function stripTypeScript(code: string): string {
 	if (!LOOKS_LIKE_TS.test(code)) return code;
 	try {
 		return new Bun.Transpiler({ loader: "ts" }).transformSync(code);

packages/coding-agent/src/exec/bash-executor.ts

@@ -65,7 +65,8 @@ async function resolveShellCwd(cwd: string | undefined): Promise<string | undefi
 	}
 }
 
-function buildMinimizerOptions(group: ShellMinimizerSettings): MinimizerOptions | undefined {
+/** Translate `ShellMinimizerSettings` into native `MinimizerOptions`, or `undefined` when disabled. */
+export function buildMinimizerOptions(group: ShellMinimizerSettings): MinimizerOptions | undefined {
 	if (!group.enabled) return undefined;
 	return {
 		enabled: true,

packages/coding-agent/src/extensibility/extensions/runner.ts

@@ -63,7 +63,7 @@ export type ExtensionErrorListener = (error: ExtensionError) => void;
 export const EXTENSION_HANDLER_TIMEOUT_MS = 30_000;
 let extensionHandlerTimeoutMs = EXTENSION_HANDLER_TIMEOUT_MS;
 
-export function __test_setExtensionHandlerTimeoutMs(timeoutMs: number): void {
+export function testSetExtensionHandlerTimeoutMs(timeoutMs: number): void {
 	extensionHandlerTimeoutMs = timeoutMs;
 }
 

packages/coding-agent/src/extensibility/extensions/types.ts

@@ -18,13 +18,11 @@ import type {
 	ProviderResponseMetadata,
 	SimpleStreamOptions,
 	TextContent,
-	ToolResultMessage,
 } from "@oh-my-pi/pi-ai";
 import type { OAuthCredentials, OAuthLoginCallbacks } from "@oh-my-pi/pi-ai/utils/oauth/types";
 import type * as piCodingAgent from "@oh-my-pi/pi-coding-agent";
 import type { AutocompleteItem, Component, EditorTheme, KeyId, TUI } from "@oh-my-pi/pi-tui";
 import type { Static, TSchema } from "@sinclair/typebox";
-import type { Rule } from "../../capability/rule";
 import type { KeybindingsManager } from "../../config/keybindings";
 import type { ModelRegistry } from "../../config/model-registry";
 import type { EditToolDetails } from "../../edit";
@@ -33,15 +31,9 @@ import type { BashResult } from "../../exec/bash-executor";
 import type { ExecOptions, ExecResult } from "../../exec/exec";
 import type { CustomEditor } from "../../modes/components/custom-editor";
 import type { Theme } from "../../modes/theme/theme";
-import type { CompactionPreparation, CompactionResult } from "../../session/compaction";
+import type { CompactionResult } from "../../session/compaction";
 import type { CustomMessage } from "../../session/messages";
-import type {
-	BranchSummaryEntry,
-	CompactionEntry,
-	ReadonlySessionManager,
-	SessionEntry,
-	SessionManager,
-} from "../../session/session-manager";
+import type { ReadonlySessionManager, SessionManager } from "../../session/session-manager";
 import type {
 	BashToolDetails,
 	BashToolInput,
@@ -53,8 +45,39 @@ import type {
 	SearchToolInput,
 	WriteToolInput,
 } from "../../tools";
-import type { TodoItem } from "../../tools/todo-write";
 import type { EventBus } from "../../utils/event-bus";
+import type {
+	AgentEndEvent,
+	AgentStartEvent,
+	AutoCompactionEndEvent,
+	AutoCompactionStartEvent,
+	AutoRetryEndEvent,
+	AutoRetryStartEvent,
+	ContextEvent,
+	SessionBeforeBranchEvent,
+	SessionBeforeBranchResult,
+	SessionBeforeCompactEvent,
+	SessionBeforeCompactResult,
+	SessionBeforeSwitchEvent,
+	SessionBeforeSwitchResult,
+	SessionBeforeTreeEvent,
+	SessionBeforeTreeResult,
+	SessionBranchEvent,
+	SessionCompactEvent,
+	SessionCompactingEvent,
+	SessionCompactingResult,
+	SessionEvent,
+	SessionShutdownEvent,
+	SessionStartEvent,
+	SessionSwitchEvent,
+	SessionTreeEvent,
+	TodoReminderEvent,
+	ToolCallEventResult,
+	ToolResultEventResult,
+	TtsrTriggeredEvent,
+	TurnEndEvent,
+	TurnStartEvent,
+} from "../shared-events";
 import type { SlashCommandInfo } from "../slash-commands";
 
 export type { AppKeybinding, KeybindingsManager } from "../../config/keybindings";
@@ -104,6 +127,11 @@ export type ExtensionWidgetContent = string[] | ExtensionUiComponentFactory | un
  * UI context for extensions to request interactive UI.
  * Each mode (interactive, RPC, print) provides its own implementation.
  */
+// fallow-ignore-next-line code-duplication
+// Parallel to HookUIContext: extensions expose a strictly larger UI surface
+// (custom editor component, header/footer, widgets, theming, terminal input)
+// and may be invoked from event handlers that have already taken the agent
+// loop's lock — hooks intentionally cannot.
 export interface ExtensionUIContext {
 	/** Show a selector and return the user's choice. */
 	select(title: string, options: string[], dialogOptions?: ExtensionUIDialogOptions): Promise<string | undefined>;
@@ -221,6 +249,11 @@ export interface CompactOptions {
 /**
  * Context passed to extension event handlers.
  */
+// fallow-ignore-next-line code-duplication
+// Parallel to HookContext: extensions expose a strictly larger runtime
+// surface (model registry, system prompt, shutdown, full session manager
+// access). Field overlap is incidental; merging into a base would require
+// hooks to widen their public contract.
 export interface ExtensionContext {
 	/** UI methods for user interaction */
 	ui: ExtensionUIContext;
@@ -256,6 +289,10 @@ export interface ExtensionContext {
  * Extended context for command handlers.
  * Includes session control methods only safe in user-initiated commands.
  */
+// fallow-ignore-next-line code-duplication
+// Parallel to HookCommandContext: same method names, different invariants —
+// extension commands additionally permit `switchSession` and `reload`,
+// which hooks must not call to avoid deadlocking the agent loop.
 export interface ExtensionCommandContext extends ExtensionContext {
 	/** Get current context usage for the active model. */
 	getContextUsage(): ContextUsage | undefined;
@@ -373,115 +410,30 @@ export interface ResourcesDiscoverResult {
 }
 
 // ============================================================================
-// Session Events
+// Session Events (shared with hooks subsystem)
 // ============================================================================
 
-/** Fired on initial session load */
-export interface SessionStartEvent {
-	type: "session_start";
-}
-
-/** Fired before switching to another session (can be cancelled) */
-export interface SessionBeforeSwitchEvent {
-	type: "session_before_switch";
-	reason: "new" | "resume" | "fork";
-	targetSessionFile?: string;
-}
-
-/** Fired after switching to another session */
-export interface SessionSwitchEvent {
-	type: "session_switch";
-	reason: "new" | "resume" | "fork";
-	previousSessionFile: string | undefined;
-}
-
-/** Fired before branching a session (can be cancelled) */
-export interface SessionBeforeBranchEvent {
-	type: "session_before_branch";
-	entryId: string;
-}
-
-/** Fired after branching a session */
-export interface SessionBranchEvent {
-	type: "session_branch";
-	previousSessionFile: string | undefined;
-}
-
-/** Fired before context compaction (can be cancelled or customized) */
-export interface SessionBeforeCompactEvent {
-	type: "session_before_compact";
-	preparation: CompactionPreparation;
-	branchEntries: SessionEntry[];
-	customInstructions?: string;
-	signal: AbortSignal;
-}
-
-/** Fired before compaction summarization to customize prompts/context */
-export interface SessionCompactingEvent {
-	type: "session.compacting";
-	sessionId: string;
-	messages: AgentMessage[];
-}
-
-/** Fired after context compaction */
-export interface SessionCompactEvent {
-	type: "session_compact";
-	compactionEntry: CompactionEntry;
-	fromExtension: boolean;
-}
-
-/** Fired on process exit */
-export interface SessionShutdownEvent {
-	type: "session_shutdown";
-}
-
-/** Preparation data for tree navigation */
-export interface TreePreparation {
-	targetId: string;
-	oldLeafId: string | null;
-	commonAncestorId: string | null;
-	entriesToSummarize: SessionEntry[];
-	userWantsSummary: boolean;
-}
-
-/** Fired before navigating in the session tree (can be cancelled) */
-export interface SessionBeforeTreeEvent {
-	type: "session_before_tree";
-	preparation: TreePreparation;
-	signal: AbortSignal;
-}
-
-/** Fired after navigating in the session tree */
-export interface SessionTreeEvent {
-	type: "session_tree";
-	newLeafId: string | null;
-	oldLeafId: string | null;
-	summaryEntry?: BranchSummaryEntry;
-	fromExtension?: boolean;
-}
-
-export type SessionEvent =
-	| SessionStartEvent
-	| SessionBeforeSwitchEvent
-	| SessionSwitchEvent
-	| SessionBeforeBranchEvent
-	| SessionBranchEvent
-	| SessionBeforeCompactEvent
-	| SessionCompactingEvent
-	| SessionCompactEvent
-	| SessionShutdownEvent
-	| SessionBeforeTreeEvent
-	| SessionTreeEvent;
+export type {
+	SessionBeforeBranchEvent,
+	SessionBeforeCompactEvent,
+	SessionBeforeSwitchEvent,
+	SessionBeforeTreeEvent,
+	SessionBranchEvent,
+	SessionCompactEvent,
+	SessionCompactingEvent,
+	SessionEvent,
+	SessionShutdownEvent,
+	SessionStartEvent,
+	SessionSwitchEvent,
+	SessionTreeEvent,
+	TreePreparation,
+} from "../shared-events";
 
 // ============================================================================
 // Agent Events
 // ============================================================================
 
-/** Fired before each LLM call. Can modify messages. */
-export interface ContextEvent {
-	type: "context";
-	messages: AgentMessage[];
-}
+export type { ContextEvent } from "../shared-events";
 
 /** Fired before a provider request is sent. Can replace the payload. */
 export interface BeforeProviderRequestEvent {
@@ -502,31 +454,7 @@ export interface BeforeAgentStartEvent {
 	systemPrompt: string[];
 }
 
-/** Fired when an agent loop starts */
-export interface AgentStartEvent {
-	type: "agent_start";
-}
-
-/** Fired when an agent loop ends */
-export interface AgentEndEvent {
-	type: "agent_end";
-	messages: AgentMessage[];
-}
-
-/** Fired at the start of each turn */
-export interface TurnStartEvent {
-	type: "turn_start";
-	turnIndex: number;
-	timestamp: number;
-}
-
-/** Fired at the end of each turn */
-export interface TurnEndEvent {
-	type: "turn_end";
-	turnIndex: number;
-	message: AgentMessage;
-	toolResults: ToolResultMessage[];
-}
+export type { AgentEndEvent, AgentStartEvent, TurnEndEvent, TurnStartEvent } from "../shared-events";
 
 /** Fired when a message starts (user, assistant, or toolResult) */
 export interface MessageStartEvent {
@@ -574,55 +502,14 @@ export interface ToolExecutionEndEvent {
 	isError: boolean;
 }
 
-/** Fired when auto-compaction starts */
-export interface AutoCompactionStartEvent {
-	type: "auto_compaction_start";
-	reason: "threshold" | "overflow" | "idle";
-	action: "context-full" | "handoff";
-}
-
-/** Fired when auto-compaction ends */
-export interface AutoCompactionEndEvent {
-	type: "auto_compaction_end";
-	action: "context-full" | "handoff";
-	result: CompactionResult | undefined;
-	aborted: boolean;
-	willRetry: boolean;
-	errorMessage?: string;
-	/** True when compaction was skipped for a benign reason (no model, no candidates, nothing to compact). */
-	skipped?: boolean;
-}
-
-/** Fired when auto-retry starts */
-export interface AutoRetryStartEvent {
-	type: "auto_retry_start";
-	attempt: number;
-	maxAttempts: number;
-	delayMs: number;
-	errorMessage: string;
-}
-
-/** Fired when auto-retry ends */
-export interface AutoRetryEndEvent {
-	type: "auto_retry_end";
-	success: boolean;
-	attempt: number;
-	finalError?: string;
-}
-
-/** Fired when TTSR rule matching interrupts generation */
-export interface TtsrTriggeredEvent {
-	type: "ttsr_triggered";
-	rules: Rule[];
-}
-
-/** Fired when todo reminder logic detects unfinished todos */
-export interface TodoReminderEvent {
-	type: "todo_reminder";
-	todos: TodoItem[];
-	attempt: number;
-	maxAttempts: number;
-}
+export type {
+	AutoCompactionEndEvent,
+	AutoCompactionStartEvent,
+	AutoRetryEndEvent,
+	AutoRetryStartEvent,
+	TodoReminderEvent,
+	TtsrTriggeredEvent,
+} from "../shared-events";
 
 /** Fired when AuthStorage automatically soft-disables a credential (e.g. OAuth `invalid_grant`). Not fired for user-initiated `remove()` or duplicate-credential dedup. */
 export interface CredentialDisabledEvent {
@@ -857,10 +744,7 @@ export interface ContextEventResult {
 
 export type BeforeProviderRequestEventResult = unknown;
 
-export interface ToolCallEventResult {
-	block?: boolean;
-	reason?: string;
-}
+export type { ToolCallEventResult } from "../shared-events";
 
 /** Result from input event handler */
 export interface InputEventResult {
@@ -884,11 +768,7 @@ export interface UserPythonEventResult {
 	result?: PythonResult;
 }
 
-export interface ToolResultEventResult {
-	content?: (TextContent | ImageContent)[];
-	details?: unknown;
-	isError?: boolean;
-}
+export type { ToolResultEventResult } from "../shared-events";
 
 export interface BeforeAgentStartEventResult {
 	message?: Pick<CustomMessage, "customType" | "content" | "display" | "details" | "attribution">;
@@ -896,33 +776,13 @@ export interface BeforeAgentStartEventResult {
 	systemPrompt?: string[];
 }
 
-export interface SessionBeforeSwitchResult {
-	cancel?: boolean;
-}
-
-export interface SessionBeforeBranchResult {
-	cancel?: boolean;
-	skipConversationRestore?: boolean;
-}
-
-export interface SessionBeforeCompactResult {
-	cancel?: boolean;
-	compaction?: CompactionResult;
-}
-
-export interface SessionCompactingResult {
-	context?: string[];
-	prompt?: string;
-	preserveData?: Record<string, unknown>;
-}
-
-export interface SessionBeforeTreeResult {
-	cancel?: boolean;
-	summary?: {
-		summary: string;
-		details?: unknown;
-	};
-}
+export type {
+	SessionBeforeBranchResult,
+	SessionBeforeCompactResult,
+	SessionBeforeSwitchResult,
+	SessionBeforeTreeResult,
+	SessionCompactingResult,
+} from "../shared-events";
 
 // ============================================================================
 // Message Rendering
@@ -942,6 +802,9 @@ export type MessageRenderer<T = unknown> = (
 // Command Registration
 // ============================================================================
 
+// fallow-ignore-next-line code-duplication
+// Parallel to HookAPI's RegisteredCommand: extensions add
+// `getArgumentCompletions` and bind handlers to ExtensionCommandContext.
 export interface RegisteredCommand {
 	name: string;
 	description?: string;

packages/coding-agent/src/extensibility/hooks/types.ts

@@ -1,28 +1,44 @@
-/**
- * Hook system types.
- *
- * Hooks are TypeScript modules that can subscribe to agent lifecycle events
- * and interact with the user via UI primitives.
- */
-import type { AgentMessage } from "@oh-my-pi/pi-agent-core";
-import type { ImageContent, Message, Model, TextContent, ToolResultMessage } from "@oh-my-pi/pi-ai";
+import type { ImageContent, Message, Model, TextContent } from "@oh-my-pi/pi-ai";
 import type { Component, TUI } from "@oh-my-pi/pi-tui";
-import type { Rule } from "../../capability/rule";
 import type { ModelRegistry } from "../../config/model-registry";
 import type { EditToolDetails } from "../../edit";
 import type { ExecOptions, ExecResult } from "../../exec/exec";
 import type { Theme } from "../../modes/theme/theme";
-import type { CompactionPreparation, CompactionResult } from "../../session/compaction";
 import type { HookMessage } from "../../session/messages";
-import type {
-	BranchSummaryEntry,
-	CompactionEntry,
-	ReadonlySessionManager,
-	SessionEntry,
-	SessionManager,
-} from "../../session/session-manager";
+import type { ReadonlySessionManager, SessionManager } from "../../session/session-manager";
 import type { BashToolDetails, FindToolDetails, ReadToolDetails, SearchToolDetails } from "../../tools";
-import type { TodoItem } from "../../tools/todo-write";
+import type {
+	AgentEndEvent,
+	AgentStartEvent,
+	AutoCompactionEndEvent,
+	AutoCompactionStartEvent,
+	AutoRetryEndEvent,
+	AutoRetryStartEvent,
+	ContextEvent,
+	SessionBeforeBranchEvent,
+	SessionBeforeBranchResult,
+	SessionBeforeCompactEvent,
+	SessionBeforeCompactResult,
+	SessionBeforeSwitchEvent,
+	SessionBeforeSwitchResult,
+	SessionBeforeTreeEvent,
+	SessionBeforeTreeResult,
+	SessionBranchEvent,
+	SessionCompactEvent,
+	SessionCompactingEvent,
+	SessionCompactingResult,
+	SessionEvent,
+	SessionShutdownEvent,
+	SessionStartEvent,
+	SessionSwitchEvent,
+	SessionTreeEvent,
+	TodoReminderEvent,
+	ToolCallEventResult,
+	ToolResultEventResult,
+	TtsrTriggeredEvent,
+	TurnEndEvent,
+	TurnStartEvent,
+} from "../shared-events";
 
 // Re-export for backward compatibility
 export type { ExecOptions, ExecResult } from "../../exec/exec";
@@ -31,6 +47,11 @@ export type { ExecOptions, ExecResult } from "../../exec/exec";
  * UI context for hooks to request interactive UI from the harness.
  * Each mode (interactive, RPC, print) provides its own implementation.
  */
+// fallow-ignore-next-line code-duplication
+// Parallel to ExtensionUIContext: hooks expose a deliberately narrower UI
+// surface — no terminal-input listener, no editor component override, no
+// theme management — because hooks are invoked from inside the agent loop
+// and must not be able to seize ownership of the editor.
 export interface HookUIContext {
 	/**
 	 * Show a selector and return the user's choice.
@@ -137,6 +158,11 @@ export interface HookUIContext {
  * Context passed to hook event handlers.
  * For command handlers, see HookCommandContext which extends this with session control methods.
  */
+// fallow-ignore-next-line code-duplication
+// Parallel to ExtensionContext: hooks see a narrower runtime context (no
+// model registry mutation, no system prompt access, no shutdown). The
+// overlap in field names is intentional API symmetry; widening hooks to
+// match extensions would let hooks call methods that deadlock the agent.
 export interface HookContext {
 	/** UI methods for user interaction */
 	ui: HookUIContext;
@@ -165,6 +191,11 @@ export interface HookContext {
  * These methods are not available in event handlers because they can cause
  * deadlocks when called from within the agent loop (e.g., tool_call, context events).
  */
+// fallow-ignore-next-line code-duplication
+// Parallel to ExtensionCommandContext: hooks intentionally omit
+// `switchSession`, `reload`, `compact`, and `getContextUsage` — those are
+// safe only from extension command handlers, not from the hook execution
+// context.
 export interface HookCommandContext extends HookContext {
 	/** Wait for the agent to finish streaming */
 	waitForIdle(): Promise<void>;
@@ -210,138 +241,25 @@ export interface HookCommandContext extends HookContext {
 }
 
 // ============================================================================
-// Session Events
+// Session Events (shared with extensions subsystem)
 // ============================================================================
 
-/** Fired on initial session load */
-export interface SessionStartEvent {
-	type: "session_start";
-}
-
-/** Fired before switching to another session (can be cancelled) */
-export interface SessionBeforeSwitchEvent {
-	type: "session_before_switch";
-	/** Reason for the switch */
-	reason: "new" | "resume" | "fork";
-	/** Session file we're switching to (only for "resume") */
-	targetSessionFile?: string;
-}
-
-/** Fired after switching to another session */
-export interface SessionSwitchEvent {
-	type: "session_switch";
-	/** Reason for the switch */
-	reason: "new" | "resume" | "fork";
-	/** Session file we came from */
-	previousSessionFile: string | undefined;
-}
-
-/** Fired before branching a session (can be cancelled) */
-export interface SessionBeforeBranchEvent {
-	type: "session_before_branch";
-	/** ID of the entry to branch from */
-	entryId: string;
-}
-
-/** Fired after branching a session */
-export interface SessionBranchEvent {
-	type: "session_branch";
-	previousSessionFile: string | undefined;
-}
-
-/** Fired before context compaction (can be cancelled) */
-export interface SessionBeforeCompactEvent {
-	type: "session_before_compact";
-	/** Compaction preparation with messages to summarize, file ops, previous summary, etc. */
-	preparation: CompactionPreparation;
-	/** Branch entries (root to current leaf). Use to inspect custom state or previous compactions. */
-	branchEntries: SessionEntry[];
-	/** Optional user-provided instructions for the summary */
-	customInstructions?: string;
-	/** Abort signal - hooks should pass this to LLM calls and check it periodically */
-	signal: AbortSignal;
-}
-
-/** Fired before compaction summarization to customize prompts/context */
-export interface SessionCompactingEvent {
-	type: "session.compacting";
-	sessionId: string;
-	messages: AgentMessage[];
-}
-
-/** Fired after context compaction */
-export interface SessionCompactEvent {
-	type: "session_compact";
-	compactionEntry: CompactionEntry;
-	/** Whether the compaction entry was provided by a hook */
-	fromExtension: boolean;
-}
-
-/** Fired on process exit (SIGINT/SIGTERM) */
-export interface SessionShutdownEvent {
-	type: "session_shutdown";
-}
-
-/** Preparation data for tree navigation (used by session_before_tree event) */
-export interface TreePreparation {
-	/** Node being switched to */
-	targetId: string;
-	/** Current active leaf (being abandoned), null if no current position */
-	oldLeafId: string | null;
-	/** Common ancestor of target and old leaf, null if no common ancestor */
-	commonAncestorId: string | null;
-	/** Entries to summarize (old leaf back to common ancestor or compaction) */
-	entriesToSummarize: SessionEntry[];
-	/** Whether user chose to summarize */
-	userWantsSummary: boolean;
-}
-
-/** Fired before navigating to a different node in the session tree (can be cancelled) */
-export interface SessionBeforeTreeEvent {
-	type: "session_before_tree";
-	/** Preparation data for the navigation */
-	preparation: TreePreparation;
-	/** Abort signal - honors Escape during summarization (model available via ctx.model) */
-	signal: AbortSignal;
-}
-
-/** Fired after navigating to a different node in the session tree */
-export interface SessionTreeEvent {
-	type: "session_tree";
-	/** The new active leaf, null if navigated to before first entry */
-	newLeafId: string | null;
-	/** Previous active leaf, null if there was no position */
-	oldLeafId: string | null;
-	/** Branch summary entry if one was created */
-	summaryEntry?: BranchSummaryEntry;
-	/** Whether summary came from hook */
-	fromExtension?: boolean;
-}
-
-/** Union of all session event types */
-export type SessionEvent =
-	| SessionStartEvent
-	| SessionBeforeSwitchEvent
-	| SessionSwitchEvent
-	| SessionBeforeBranchEvent
-	| SessionBranchEvent
-	| SessionBeforeCompactEvent
-	| SessionCompactingEvent
-	| SessionCompactEvent
-	| SessionShutdownEvent
-	| SessionBeforeTreeEvent
-	| SessionTreeEvent;
-
-/**
- * Event data for context event.
- * Fired before each LLM call, allowing hooks to modify context non-destructively.
- * Original session messages are NOT modified - only the messages sent to the LLM are affected.
- */
-export interface ContextEvent {
-	type: "context";
-	/** Messages about to be sent to the LLM (deep copy, safe to modify) */
-	messages: AgentMessage[];
-}
+export type {
+	ContextEvent,
+	SessionBeforeBranchEvent,
+	SessionBeforeCompactEvent,
+	SessionBeforeSwitchEvent,
+	SessionBeforeTreeEvent,
+	SessionBranchEvent,
+	SessionCompactEvent,
+	SessionCompactingEvent,
+	SessionEvent,
+	SessionShutdownEvent,
+	SessionStartEvent,
+	SessionSwitchEvent,
+	SessionTreeEvent,
+	TreePreparation,
+} from "../shared-events";
 
 /**
  * Event data for before_agent_start event.
@@ -356,90 +274,18 @@ export interface BeforeAgentStartEvent {
 	images?: ImageContent[];
 }
 
-/**
- * Event data for agent_start event.
- * Fired when an agent loop starts (once per user prompt).
- */
-export interface AgentStartEvent {
-	type: "agent_start";
-}
-
-/**
- * Event data for agent_end event.
- */
-export interface AgentEndEvent {
-	type: "agent_end";
-	messages: AgentMessage[];
-}
-
-/**
- * Event data for turn_start event.
- */
-export interface TurnStartEvent {
-	type: "turn_start";
-	turnIndex: number;
-	timestamp: number;
-}
-
-/**
- * Event data for turn_end event.
- */
-export interface TurnEndEvent {
-	type: "turn_end";
-	turnIndex: number;
-	message: AgentMessage;
-	toolResults: ToolResultMessage[];
-}
-
-/** Event data for auto_compaction_start event. */
-export interface AutoCompactionStartEvent {
-	type: "auto_compaction_start";
-	reason: "threshold" | "overflow" | "idle";
-	action: "context-full" | "handoff";
-}
-
-/** Event data for auto_compaction_end event. */
-export interface AutoCompactionEndEvent {
-	type: "auto_compaction_end";
-	action: "context-full" | "handoff";
-	result: CompactionResult | undefined;
-	aborted: boolean;
-	willRetry: boolean;
-	errorMessage?: string;
-	/** True when compaction was skipped for a benign reason (no model, no candidates, nothing to compact). */
-	skipped?: boolean;
-}
-
-/** Event data for auto_retry_start event. */
-export interface AutoRetryStartEvent {
-	type: "auto_retry_start";
-	attempt: number;
-	maxAttempts: number;
-	delayMs: number;
-	errorMessage: string;
-}
-
-/** Event data for auto_retry_end event. */
-export interface AutoRetryEndEvent {
-	type: "auto_retry_end";
-	success: boolean;
-	attempt: number;
-	finalError?: string;
-}
-
-/** Event data for ttsr_triggered event. */
-export interface TtsrTriggeredEvent {
-	type: "ttsr_triggered";
-	rules: Rule[];
-}
-
-/** Event data for todo_reminder event. */
-export interface TodoReminderEvent {
-	type: "todo_reminder";
-	todos: TodoItem[];
-	attempt: number;
-	maxAttempts: number;
-}
+export type {
+	AgentEndEvent,
+	AgentStartEvent,
+	AutoCompactionEndEvent,
+	AutoCompactionStartEvent,
+	AutoRetryEndEvent,
+	AutoRetryStartEvent,
+	TodoReminderEvent,
+	TtsrTriggeredEvent,
+	TurnEndEvent,
+	TurnStartEvent,
+} from "../shared-events";
 
 /**
  * Event data for tool_call event.
@@ -559,29 +405,7 @@ export interface ContextEventResult {
 	messages?: Message[];
 }
 
-/**
- * Return type for tool_call event handlers.
- * Allows hooks to block tool execution.
- */
-export interface ToolCallEventResult {
-	/** If true, block the tool from executing */
-	block?: boolean;
-	/** Reason for blocking (returned to LLM as error) */
-	reason?: string;
-}
-
-/**
- * Return type for tool_result event handlers.
- * Allows hooks to modify tool results.
- */
-export interface ToolResultEventResult {
-	/** Replacement content array (text and images) */
-	content?: (TextContent | ImageContent)[];
-	/** Replacement details */
-	details?: unknown;
-	/** Override isError flag */
-	isError?: boolean;
-}
+export type { ToolCallEventResult, ToolResultEventResult } from "../shared-events";
 
 /**
  * Return type for before_agent_start event handlers.
@@ -592,65 +416,13 @@ export interface BeforeAgentStartEventResult {
 	message?: Pick<HookMessage, "customType" | "content" | "display" | "details" | "attribution">;
 }
 
-/** Return type for session_before_switch handlers */
-export interface SessionBeforeSwitchResult {
-	/** If true, cancel the switch */
-	cancel?: boolean;
-}
-
-/** Return type for session_before_branch handlers */
-export interface SessionBeforeBranchResult {
-	/**
-	 * If true, abort the branch entirely. No new session file is created,
-	 * conversation stays unchanged.
-	 */
-	cancel?: boolean;
-	/**
-	 * If true, the branch proceeds (new session file created, session state updated)
-	 * but the in-memory conversation is NOT rewound to the branch point.
-	 *
-	 * Use case: git-checkpoint hook that restores code state separately.
-	 * The hook handles state restoration itself, so it doesn't want the
-	 * agent's conversation to be rewound (which would lose recent context).
-	 *
-	 * - `cancel: true` → nothing happens, user stays in current session
-	 * - `skipConversationRestore: true` → branch happens, but messages stay as-is
-	 * - neither → branch happens AND messages rewind to branch point (default)
-	 */
-	skipConversationRestore?: boolean;
-}
-
-/** Return type for session_before_compact handlers */
-export interface SessionBeforeCompactResult {
-	/** If true, cancel the compaction */
-	cancel?: boolean;
-	/** Custom compaction result - SessionManager adds id/parentId */
-	compaction?: CompactionResult;
-}
-
-/** Return type for session.compacting handlers */
-export interface SessionCompactingResult {
-	/** Additional context lines to include in summary */
-	context?: string[];
-	/** Override the default compaction prompt */
-	prompt?: string;
-	/** Custom data to store in compaction entry */
-	preserveData?: Record<string, unknown>;
-}
-
-/** Return type for session_before_tree handlers */
-export interface SessionBeforeTreeResult {
-	/** If true, cancel the navigation entirely */
-	cancel?: boolean;
-	/**
-	 * Custom summary (skips default summarizer).
-	 * Only used if preparation.userWantsSummary is true.
-	 */
-	summary?: {
-		summary: string;
-		details?: unknown;
-	};
-}
+export type {
+	SessionBeforeBranchResult,
+	SessionBeforeCompactResult,
+	SessionBeforeSwitchResult,
+	SessionBeforeTreeResult,
+	SessionCompactingResult,
+} from "../shared-events";
 
 // ============================================================================
 // Hook API
@@ -681,6 +453,9 @@ export type HookMessageRenderer<T = unknown> = (
 /**
  * Command registration options.
  */
+// fallow-ignore-next-line code-duplication
+// Parallel to extensions' RegisteredCommand: hooks bind to
+// HookCommandContext and have no argument-completion hook.
 export interface RegisteredCommand {
 	name: string;
 	description?: string;

packages/coding-agent/src/extensibility/shared-events.ts

@@ -0,0 +1,335 @@
+/**
+ * Event payload and result shapes shared between the extensions and hooks
+ * subsystems.
+ *
+ * Both subsystems observe the same agent/session lifecycle, so the *event*
+ * payloads (what happened) and the simpler *result* shapes (handler return
+ * values that don't depend on subsystem-specific identifiers like
+ * `AgentMessage` vs `Message`) are intentionally identical.
+ *
+ * Anything that diverges between the two subsystems — UI context, runtime
+ * context, command context, tool-call discrimination, or return shapes that
+ * carry subsystem-specific message types — lives in the per-subsystem
+ * `types.ts` files and is documented there.
+ */
+import type { AgentMessage } from "@oh-my-pi/pi-agent-core";
+import type { ImageContent, TextContent, ToolResultMessage } from "@oh-my-pi/pi-ai";
+import type { Rule } from "../capability/rule";
+import type { CompactionPreparation, CompactionResult } from "../session/compaction";
+import type { BranchSummaryEntry, CompactionEntry, SessionEntry } from "../session/session-manager";
+import type { TodoItem } from "../tools/todo-write";
+
+// ============================================================================
+// Session Events
+// ============================================================================
+
+/** Fired on initial session load */
+export interface SessionStartEvent {
+	type: "session_start";
+}
+
+/** Fired before switching to another session (can be cancelled) */
+export interface SessionBeforeSwitchEvent {
+	type: "session_before_switch";
+	/** Reason for the switch */
+	reason: "new" | "resume" | "fork";
+	/** Session file we're switching to (only for "resume") */
+	targetSessionFile?: string;
+}
+
+/** Fired after switching to another session */
+export interface SessionSwitchEvent {
+	type: "session_switch";
+	/** Reason for the switch */
+	reason: "new" | "resume" | "fork";
+	/** Session file we came from */
+	previousSessionFile: string | undefined;
+}
+
+/** Fired before branching a session (can be cancelled) */
+export interface SessionBeforeBranchEvent {
+	type: "session_before_branch";
+	/** ID of the entry to branch from */
+	entryId: string;
+}
+
+/** Fired after branching a session */
+export interface SessionBranchEvent {
+	type: "session_branch";
+	previousSessionFile: string | undefined;
+}
+
+/** Fired before context compaction (can be cancelled or customized) */
+export interface SessionBeforeCompactEvent {
+	type: "session_before_compact";
+	/** Compaction preparation with messages to summarize, file ops, previous summary, etc. */
+	preparation: CompactionPreparation;
+	/** Branch entries (root to current leaf). Use to inspect custom state or previous compactions. */
+	branchEntries: SessionEntry[];
+	/** Optional user-provided instructions for the summary */
+	customInstructions?: string;
+	/** Abort signal - handlers should pass this to LLM calls and check it periodically */
+	signal: AbortSignal;
+}
+
+/** Fired before compaction summarization to customize prompts/context */
+export interface SessionCompactingEvent {
+	type: "session.compacting";
+	sessionId: string;
+	messages: AgentMessage[];
+}
+
+/** Fired after context compaction */
+export interface SessionCompactEvent {
+	type: "session_compact";
+	compactionEntry: CompactionEntry;
+	/** Whether the compaction entry was provided by an extension/hook */
+	fromExtension: boolean;
+}
+
+/** Fired on process exit (SIGINT/SIGTERM) */
+export interface SessionShutdownEvent {
+	type: "session_shutdown";
+}
+
+/** Preparation data for tree navigation (used by session_before_tree event) */
+export interface TreePreparation {
+	/** Node being switched to */
+	targetId: string;
+	/** Current active leaf (being abandoned), null if no current position */
+	oldLeafId: string | null;
+	/** Common ancestor of target and old leaf, null if no common ancestor */
+	commonAncestorId: string | null;
+	/** Entries to summarize (old leaf back to common ancestor or compaction) */
+	entriesToSummarize: SessionEntry[];
+	/** Whether user chose to summarize */
+	userWantsSummary: boolean;
+}
+
+/** Fired before navigating to a different node in the session tree (can be cancelled) */
+export interface SessionBeforeTreeEvent {
+	type: "session_before_tree";
+	/** Preparation data for the navigation */
+	preparation: TreePreparation;
+	/** Abort signal - honors Escape during summarization (model available via ctx.model) */
+	signal: AbortSignal;
+}
+
+/** Fired after navigating to a different node in the session tree */
+export interface SessionTreeEvent {
+	type: "session_tree";
+	/** The new active leaf, null if navigated to before first entry */
+	newLeafId: string | null;
+	/** Previous active leaf, null if there was no position */
+	oldLeafId: string | null;
+	/** Branch summary entry if one was created */
+	summaryEntry?: BranchSummaryEntry;
+	/** Whether summary came from extension/hook */
+	fromExtension?: boolean;
+}
+
+/** Union of all session event types */
+export type SessionEvent =
+	| SessionStartEvent
+	| SessionBeforeSwitchEvent
+	| SessionSwitchEvent
+	| SessionBeforeBranchEvent
+	| SessionBranchEvent
+	| SessionBeforeCompactEvent
+	| SessionCompactingEvent
+	| SessionCompactEvent
+	| SessionShutdownEvent
+	| SessionBeforeTreeEvent
+	| SessionTreeEvent;
+
+// ============================================================================
+// Agent / Turn Events
+// ============================================================================
+
+/**
+ * Fired before each LLM call.
+ *
+ * Original session messages are NOT modified - only the messages sent to the
+ * LLM are affected when a handler returns a replacement (the return shape
+ * differs between extensions and hooks; see each subsystem's
+ * `ContextEventResult`).
+ */
+export interface ContextEvent {
+	type: "context";
+	/** Messages about to be sent to the LLM (deep copy, safe to modify) */
+	messages: AgentMessage[];
+}
+
+/**
+ * Fired when an agent loop starts (once per user prompt).
+ */
+export interface AgentStartEvent {
+	type: "agent_start";
+}
+
+/** Fired when an agent loop ends */
+export interface AgentEndEvent {
+	type: "agent_end";
+	messages: AgentMessage[];
+}
+
+/** Fired at the start of each turn */
+export interface TurnStartEvent {
+	type: "turn_start";
+	turnIndex: number;
+	timestamp: number;
+}
+
+/** Fired at the end of each turn */
+export interface TurnEndEvent {
+	type: "turn_end";
+	turnIndex: number;
+	message: AgentMessage;
+	toolResults: ToolResultMessage[];
+}
+
+// ============================================================================
+// Auto-compaction / Auto-retry Events
+// ============================================================================
+
+/** Fired when auto-compaction starts */
+export interface AutoCompactionStartEvent {
+	type: "auto_compaction_start";
+	reason: "threshold" | "overflow" | "idle";
+	action: "context-full" | "handoff";
+}
+
+/** Fired when auto-compaction ends */
+export interface AutoCompactionEndEvent {
+	type: "auto_compaction_end";
+	action: "context-full" | "handoff";
+	result: CompactionResult | undefined;
+	aborted: boolean;
+	willRetry: boolean;
+	errorMessage?: string;
+	/** True when compaction was skipped for a benign reason (no model, no candidates, nothing to compact). */
+	skipped?: boolean;
+}
+
+/** Fired when auto-retry starts */
+export interface AutoRetryStartEvent {
+	type: "auto_retry_start";
+	attempt: number;
+	maxAttempts: number;
+	delayMs: number;
+	errorMessage: string;
+}
+
+/** Fired when auto-retry ends */
+export interface AutoRetryEndEvent {
+	type: "auto_retry_end";
+	success: boolean;
+	attempt: number;
+	finalError?: string;
+}
+
+// ============================================================================
+// TTSR / Todo Reminders
+// ============================================================================
+
+/** Fired when TTSR rule matching interrupts generation */
+export interface TtsrTriggeredEvent {
+	type: "ttsr_triggered";
+	rules: Rule[];
+}
+
+/** Fired when todo reminder logic detects unfinished todos */
+export interface TodoReminderEvent {
+	type: "todo_reminder";
+	todos: TodoItem[];
+	attempt: number;
+	maxAttempts: number;
+}
+
+// ============================================================================
+// Shared Event Result Shapes
+// ============================================================================
+
+/**
+ * Return type for `tool_call` handlers.
+ * Allows handlers to block tool execution.
+ */
+export interface ToolCallEventResult {
+	/** If true, block the tool from executing */
+	block?: boolean;
+	/** Reason for blocking (returned to LLM as error) */
+	reason?: string;
+}
+
+/**
+ * Return type for `tool_result` handlers.
+ * Allows handlers to modify tool results.
+ */
+export interface ToolResultEventResult {
+	/** Replacement content array (text and images) */
+	content?: (TextContent | ImageContent)[];
+	/** Replacement details */
+	details?: unknown;
+	/** Override isError flag */
+	isError?: boolean;
+}
+
+/** Return type for `session_before_switch` handlers */
+export interface SessionBeforeSwitchResult {
+	/** If true, cancel the switch */
+	cancel?: boolean;
+}
+
+/** Return type for `session_before_branch` handlers */
+export interface SessionBeforeBranchResult {
+	/**
+	 * If true, abort the branch entirely. No new session file is created,
+	 * conversation stays unchanged.
+	 */
+	cancel?: boolean;
+	/**
+	 * If true, the branch proceeds (new session file created, session state updated)
+	 * but the in-memory conversation is NOT rewound to the branch point.
+	 *
+	 * Use case: git-checkpoint handler that restores code state separately.
+	 * The handler handles state restoration itself, so it doesn't want the
+	 * agent's conversation to be rewound (which would lose recent context).
+	 *
+	 * - `cancel: true` → nothing happens, user stays in current session
+	 * - `skipConversationRestore: true` → branch happens, but messages stay as-is
+	 * - neither → branch happens AND messages rewind to branch point (default)
+	 */
+	skipConversationRestore?: boolean;
+}
+
+/** Return type for `session_before_compact` handlers */
+export interface SessionBeforeCompactResult {
+	/** If true, cancel the compaction */
+	cancel?: boolean;
+	/** Custom compaction result - SessionManager adds id/parentId */
+	compaction?: CompactionResult;
+}
+
+/** Return type for `session.compacting` handlers */
+export interface SessionCompactingResult {
+	/** Additional context lines to include in summary */
+	context?: string[];
+	/** Override the default compaction prompt */
+	prompt?: string;
+	/** Custom data to store in compaction entry */
+	preserveData?: Record<string, unknown>;
+}
+
+/** Return type for `session_before_tree` handlers */
+export interface SessionBeforeTreeResult {
+	/** If true, cancel the navigation entirely */
+	cancel?: boolean;
+	/**
+	 * Custom summary (skips default summarizer).
+	 * Only used if preparation.userWantsSummary is true.
+	 */
+	summary?: {
+		summary: string;
+		details?: unknown;
+	};
+}

packages/coding-agent/src/hindsight/mental-models.ts

@@ -379,4 +379,4 @@ export const MENTAL_MODEL_FIRST_TURN_DEADLINE_MS = 1500;
 export const MENTAL_MODEL_REFRESH_INTERVAL_MS = 5 * 60 * 1000;
 
 /** Need-only export of the raw seed list for tests. */
-export const __builtinSeedsForTest: ReadonlyArray<Readonly<RawSeed>> = BUILTIN_SEEDS;
+export const builtinSeedsForTest: ReadonlyArray<Readonly<RawSeed>> = BUILTIN_SEEDS;

packages/coding-agent/src/internal-urls/agent-protocol.ts

@@ -14,29 +14,10 @@
 import * as fs from "node:fs/promises";
 import * as path from "node:path";
 import { isEnoent } from "@oh-my-pi/pi-utils";
-import { AgentRegistry } from "../registry/agent-registry";
 import { applyQuery, pathToQuery } from "./json-query";
+import { artifactsDirsFromRegistry } from "./registry-helpers";
 import type { InternalResource, InternalUrl, ProtocolHandler } from "./types";
 
-/**
- * Snapshot of artifacts dirs for every registered session, deduped.
- *
- * Prefers `sessionManager.getArtifactsDir()` because subagents adopt the
- * parent's manager and report the parent's dir there; dedup then collapses
- * the whole agent tree to one entry. Falls back to the raw session file
- * when no live session reference is attached.
- */
-function artifactsDirsFromRegistry(): string[] {
-	const dirs: string[] = [];
-	for (const ref of AgentRegistry.global().list()) {
-		const dir =
-			ref.session?.sessionManager.getArtifactsDir() ?? (ref.sessionFile ? ref.sessionFile.slice(0, -6) : null);
-		if (!dir) continue;
-		if (!dirs.includes(dir)) dirs.push(dir);
-	}
-	return dirs;
-}
-
 /**
  * Handler for agent:// URLs.
  *

packages/coding-agent/src/internal-urls/artifact-protocol.ts

@@ -12,27 +12,9 @@
 import * as fs from "node:fs/promises";
 import * as path from "node:path";
 import { isEnoent } from "@oh-my-pi/pi-utils";
-import { AgentRegistry } from "../registry/agent-registry";
+import { artifactsDirsFromRegistry } from "./registry-helpers";
 import type { InternalResource, InternalUrl, ProtocolHandler } from "./types";
 
-/**
- * Snapshot of artifacts dirs across all registered sessions, deduped.
- *
- * Subagents adopt their parent's `ArtifactManager`, so their
- * `sessionManager.getArtifactsDir()` returns the parent's dir; dedup
- * collapses parent + N subagents to a single entry.
- */
-function artifactsDirsFromRegistry(): string[] {
-	const dirs: string[] = [];
-	for (const ref of AgentRegistry.global().list()) {
-		const dir =
-			ref.session?.sessionManager.getArtifactsDir() ?? (ref.sessionFile ? ref.sessionFile.slice(0, -6) : null);
-		if (!dir) continue;
-		if (!dirs.includes(dir)) dirs.push(dir);
-	}
-	return dirs;
-}
-
 export class ArtifactProtocolHandler implements ProtocolHandler {
 	readonly scheme = "artifact";
 	readonly immutable = true;

packages/coding-agent/src/internal-urls/registry-helpers.ts

@@ -0,0 +1,25 @@
+/**
+ * Shared helpers for internal-url protocol handlers that resolve IDs against
+ * registered agent sessions.
+ */
+import { AgentRegistry } from "../registry/agent-registry";
+
+/**
+ * Snapshot of artifacts dirs for every registered session, deduped.
+ *
+ * Prefers `sessionManager.getArtifactsDir()` because subagents adopt their
+ * parent's `ArtifactManager` and report the parent's dir there; dedup then
+ * collapses parent + N subagents (the whole agent tree) to one entry. Falls
+ * back to the raw session file (with the `.jsonl` suffix stripped) when no
+ * live session reference is attached.
+ */
+export function artifactsDirsFromRegistry(): string[] {
+	const dirs: string[] = [];
+	for (const ref of AgentRegistry.global().list()) {
+		const dir =
+			ref.session?.sessionManager.getArtifactsDir() ?? (ref.sessionFile ? ref.sessionFile.slice(0, -6) : null);
+		if (!dir) continue;
+		if (!dirs.includes(dir)) dirs.push(dir);
+	}
+	return dirs;
+}

packages/coding-agent/src/modes/components/bash-execution.ts

@@ -7,19 +7,23 @@ import {
 	Container,
 	Ellipsis,
 	ImageProtocol,
-	Loader,
-	Spacer,
+	type Loader,
 	TERMINAL,
 	Text,
 	type TUI,
 	truncateToWidth,
 	visibleWidth,
 } from "@oh-my-pi/pi-tui";
-import { getSymbolTheme, theme } from "../../modes/theme/theme";
-import { formatTruncationMetaNotice, type TruncationMeta } from "../../tools/output-meta";
+import { theme } from "../../modes/theme/theme";
+import type { TruncationMeta } from "../../tools/output-meta";
 import { getSixelLineMask, isSixelPassthroughEnabled, sanitizeWithOptionalSixelPassthrough } from "../../utils/sixel";
-import { DynamicBorder } from "./dynamic-border";
-import { truncateToVisualLines } from "./visual-truncate";
+import {
+	buildExecutionFrame,
+	buildStatusFooter,
+	createCollapsedPreview,
+	type ExecutionStatus,
+	resolveExecutionStatus,
+} from "./execution-shared";
 
 // Preview line limit when not expanded (matches tool execution behavior)
 const PREVIEW_LINES = 20;
@@ -31,7 +35,7 @@ const CHUNK_THROTTLE_MS = 50;
 
 export class BashExecutionComponent extends Container {
 	#outputLines: string[] = [];
-	#status: "running" | "complete" | "cancelled" | "error" = "running";
+	#status: ExecutionStatus = "running";
 	#exitCode: number | undefined = undefined;
 	#loader: Loader;
 	#truncation?: TruncationMeta;
@@ -50,34 +54,14 @@ export class BashExecutionComponent extends Container {
 
 		// Use dim border for excluded-from-context commands (!! prefix)
 		const colorKey = excludeFromContext ? "dim" : "bashMode";
-		const borderColor = (str: string) => theme.fg(colorKey, str);
-
-		// Add spacer
-		this.addChild(new Spacer(1));
-
-		// Top border
-		this.addChild(new DynamicBorder(borderColor));
-
-		// Content container (holds dynamic content between borders)
-		this.#contentContainer = new Container();
-		this.addChild(this.#contentContainer);
+		const { contentContainer, loader } = buildExecutionFrame(this, ui, colorKey);
+		this.#contentContainer = contentContainer;
+		this.#loader = loader;
 
 		// Command header
 		this.#headerText = new Text(theme.fg(colorKey, theme.bold(`$ ${command}`)), 1, 0);
 		this.#contentContainer.addChild(this.#headerText);
-
-		// Loader
-		this.#loader = new Loader(
-			ui,
-			spinner => theme.fg(colorKey, spinner),
-			text => theme.fg("muted", text),
-			`Running… (esc to cancel)`,
-			getSymbolTheme().spinnerFrames,
-		);
 		this.#contentContainer.addChild(this.#loader);
-
-		// Bottom border
-		this.addChild(new DynamicBorder(borderColor));
 	}
 
 	/**
@@ -130,11 +114,7 @@ export class BashExecutionComponent extends Container {
 		options?: { output?: string; truncation?: TruncationMeta },
 	): void {
 		this.#exitCode = exitCode;
-		this.#status = cancelled
-			? "cancelled"
-			: exitCode !== 0 && exitCode !== undefined && exitCode !== null
-				? "error"
-				: "complete";
+		this.#status = resolveExecutionStatus(exitCode, cancelled);
 		this.#truncation = options?.truncation;
 		if (options?.output !== undefined) {
 			this.#setOutput(options.output);
@@ -182,14 +162,7 @@ export class BashExecutionComponent extends Container {
 			} else {
 				// Use shared visual truncation utility, recomputed per render width
 				const styledOutput = previewLogicalLines.map(line => theme.fg("muted", line)).join("\n");
-				const previewText = `\n${styledOutput}`;
-				this.#contentContainer.addChild({
-					render: (width: number) => {
-						const { visualLines } = truncateToVisualLines(previewText, PREVIEW_LINES, width, 1);
-						return visualLines;
-					},
-					invalidate: () => {},
-				});
+				this.#contentContainer.addChild(createCollapsedPreview(`\n${styledOutput}`, PREVIEW_LINES));
 			}
 		}
 
@@ -197,26 +170,14 @@ export class BashExecutionComponent extends Container {
 		if (this.#status === "running") {
 			this.#contentContainer.addChild(this.#loader);
 		} else {
-			const statusParts: string[] = [];
-
-			// Show how many lines are hidden (collapsed preview)
-			if (hiddenLineCount > 0 && !hasSixelOutput) {
-				statusParts.push(theme.fg("dim", `… ${hiddenLineCount} more lines (ctrl+o to expand)`));
-			}
-
-			if (this.#status === "cancelled") {
-				statusParts.push(theme.fg("warning", "(cancelled)"));
-			} else if (this.#status === "error") {
-				statusParts.push(theme.fg("error", `(exit ${this.#exitCode})`));
-			}
-
-			if (this.#truncation) {
-				statusParts.push(theme.fg("warning", formatTruncationMetaNotice(this.#truncation)));
-			}
-
-			if (statusParts.length > 0) {
-				this.#contentContainer.addChild(new Text(`\n${statusParts.join("\n")}`, 1, 0));
-			}
+			const footer = buildStatusFooter({
+				status: this.#status,
+				exitCode: this.#exitCode,
+				truncation: this.#truncation,
+				hiddenLineCount,
+				suppressHiddenCount: hasSixelOutput,
+			});
+			if (footer) this.#contentContainer.addChild(footer);
 		}
 	}
 

packages/coding-agent/src/modes/components/custom-message.ts

@@ -1,9 +1,9 @@
-import type { TextContent } from "@oh-my-pi/pi-ai";
 import type { Component } from "@oh-my-pi/pi-tui";
-import { Box, Container, Markdown, Spacer, Text } from "@oh-my-pi/pi-tui";
+import { Box, Container, Spacer } from "@oh-my-pi/pi-tui";
 import type { MessageRenderer } from "../../extensibility/extensions/types";
-import { getMarkdownTheme, theme } from "../../modes/theme/theme";
+import { theme } from "../../modes/theme/theme";
 import type { CustomMessage } from "../../session/messages";
+import { renderFramedMessage } from "./message-frame";
 
 /**
  * Component that renders a custom message entry from extensions.
@@ -41,51 +41,25 @@ export class CustomMessageComponent extends Container {
 	}
 
 	#rebuild(): void {
-		// Remove previous content component
 		if (this.#customComponent) {
 			this.removeChild(this.#customComponent);
 			this.#customComponent = undefined;
 		}
 		this.removeChild(this.#box);
 
-		// Try custom renderer first - it handles its own styling
-		if (this.customRenderer) {
-			try {
-				const component = this.customRenderer(this.message, { expanded: this.#expanded }, theme);
-				if (component) {
-					this.#customComponent = component;
-					this.addChild(component);
-					return;
-				}
-			} catch {
-				// Fall through to default rendering
-			}
-		}
+		const custom = renderFramedMessage({
+			message: this.message,
+			box: this.#box,
+			expanded: this.#expanded,
+			customRenderer: this.customRenderer,
+			// Extension messages render full content; no collapse-on-fold behaviour.
+		});
 
-		// Default rendering uses our box
-		this.addChild(this.#box);
-		this.#box.clear();
-
-		// Default rendering: label + content
-		const label = theme.fg("customMessageLabel", theme.bold(`[${this.message.customType}]`));
-		this.#box.addChild(new Text(label, 0, 0));
-		this.#box.addChild(new Spacer(1));
-
-		// Extract text content
-		let text: string;
-		if (typeof this.message.content === "string") {
-			text = this.message.content;
+		if (custom) {
+			this.#customComponent = custom;
+			this.addChild(custom);
 		} else {
-			text = this.message.content
-				.filter((c): c is TextContent => c.type === "text")
-				.map(c => c.text)
-				.join("\n");
+			this.addChild(this.#box);
 		}
-
-		this.#box.addChild(
-			new Markdown(text, 0, 0, getMarkdownTheme(), {
-				color: (value: string) => theme.fg("customMessageText", value),
-			}),
-		);
 	}
 }

packages/coding-agent/src/modes/components/eval-execution.ts

@@ -4,11 +4,17 @@
  */
 
 import { sanitizeText } from "@oh-my-pi/pi-natives";
-import { Container, Loader, Spacer, Text, type TUI } from "@oh-my-pi/pi-tui";
-import { getSymbolTheme, highlightCode, theme } from "../../modes/theme/theme";
-import { formatTruncationMetaNotice, type TruncationMeta } from "../../tools/output-meta";
-import { DynamicBorder } from "./dynamic-border";
-import { truncateToVisualLines } from "./visual-truncate";
+import { Container, type Loader, Text, type TUI } from "@oh-my-pi/pi-tui";
+import { highlightCode, theme } from "../../modes/theme/theme";
+import type { TruncationMeta } from "../../tools/output-meta";
+import {
+	buildExecutionFrame,
+	buildStatusFooter,
+	createCollapsedPreview,
+	type ExecutionColorKey,
+	type ExecutionStatus,
+	resolveExecutionStatus,
+} from "./execution-shared";
 
 const PREVIEW_LINES = 20;
 const MAX_DISPLAY_LINE_CHARS = 4000;
@@ -17,7 +23,7 @@ export type EvalExecutionLanguage = "python" | "js";
 
 export class EvalExecutionComponent extends Container {
 	#outputLines: string[] = [];
-	#status: "running" | "complete" | "cancelled" | "error" = "running";
+	#status: ExecutionStatus = "running";
 	#exitCode: number | undefined = undefined;
 	#loader: Loader;
 	#truncation?: TruncationMeta;
@@ -28,7 +34,7 @@ export class EvalExecutionComponent extends Container {
 		return this.language === "js" ? "javascript" : "python";
 	}
 
-	#formatHeader(colorKey: "dim" | "pythonMode"): Text {
+	#formatHeader(colorKey: ExecutionColorKey): Text {
 		const prompt = theme.fg(colorKey, theme.bold(">>>"));
 		const continuation = theme.fg(colorKey, "    ");
 		const codeLines = highlightCode(this.code, this.#highlightLang());
@@ -46,26 +52,13 @@ export class EvalExecutionComponent extends Container {
 	) {
 		super();
 
-		const colorKey = this.excludeFromContext ? "dim" : "pythonMode";
-		const borderColor = (str: string) => theme.fg(colorKey, str);
+		const colorKey: ExecutionColorKey = this.excludeFromContext ? "dim" : "pythonMode";
+		const { contentContainer, loader } = buildExecutionFrame(this, ui, colorKey);
+		this.#contentContainer = contentContainer;
+		this.#loader = loader;
 
-		this.addChild(new Spacer(1));
-		this.addChild(new DynamicBorder(borderColor));
-
-		this.#contentContainer = new Container();
-		this.addChild(this.#contentContainer);
 		this.#contentContainer.addChild(this.#formatHeader(colorKey));
-
-		this.#loader = new Loader(
-			ui,
-			spinner => theme.fg(colorKey, spinner),
-			text => theme.fg("muted", text),
-			`Running… (esc to cancel)`,
-			getSymbolTheme().spinnerFrames,
-		);
 		this.#contentContainer.addChild(this.#loader);
-
-		this.addChild(new DynamicBorder(borderColor));
 	}
 
 	setExpanded(expanded: boolean): void {
@@ -99,11 +92,7 @@ export class EvalExecutionComponent extends Container {
 		options?: { output?: string; truncation?: TruncationMeta },
 	): void {
 		this.#exitCode = exitCode;
-		this.#status = cancelled
-			? "cancelled"
-			: exitCode !== 0 && exitCode !== undefined && exitCode !== null
-				? "error"
-				: "complete";
+		this.#status = resolveExecutionStatus(exitCode, cancelled);
 		this.#truncation = options?.truncation;
 		if (options?.output !== undefined) {
 			this.#setOutput(options.output);
@@ -120,7 +109,7 @@ export class EvalExecutionComponent extends Container {
 
 		this.#contentContainer.clear();
 
-		const colorKey = this.excludeFromContext ? "dim" : "pythonMode";
+		const colorKey: ExecutionColorKey = this.excludeFromContext ? "dim" : "pythonMode";
 		this.#contentContainer.addChild(this.#formatHeader(colorKey));
 
 		if (availableLines.length > 0) {
@@ -129,39 +118,20 @@ export class EvalExecutionComponent extends Container {
 				this.#contentContainer.addChild(new Text(`\n${displayText}`, 1, 0));
 			} else {
 				const styledOutput = previewLogicalLines.map(line => theme.fg("muted", line)).join("\n");
-				const previewText = `\n${styledOutput}`;
-				this.#contentContainer.addChild({
-					render: (width: number) => {
-						const { visualLines } = truncateToVisualLines(previewText, PREVIEW_LINES, width, 1);
-						return visualLines;
-					},
-					invalidate: () => {},
-				});
+				this.#contentContainer.addChild(createCollapsedPreview(`\n${styledOutput}`, PREVIEW_LINES));
 			}
 		}
 
 		if (this.#status === "running") {
 			this.#contentContainer.addChild(this.#loader);
 		} else {
-			const statusParts: string[] = [];
-
-			if (hiddenLineCount > 0) {
-				statusParts.push(theme.fg("dim", `… ${hiddenLineCount} more lines (ctrl+o to expand)`));
-			}
-
-			if (this.#status === "cancelled") {
-				statusParts.push(theme.fg("warning", "(cancelled)"));
-			} else if (this.#status === "error") {
-				statusParts.push(theme.fg("error", `(exit ${this.#exitCode})`));
-			}
-
-			if (this.#truncation) {
-				statusParts.push(theme.fg("warning", formatTruncationMetaNotice(this.#truncation)));
-			}
-
-			if (statusParts.length > 0) {
-				this.#contentContainer.addChild(new Text(`\n${statusParts.join("\n")}`, 1, 0));
-			}
+			const footer = buildStatusFooter({
+				status: this.#status,
+				exitCode: this.#exitCode,
+				truncation: this.#truncation,
+				hiddenLineCount,
+			});
+			if (footer) this.#contentContainer.addChild(footer);
 		}
 	}
 

packages/coding-agent/src/modes/components/execution-shared.ts

@@ -0,0 +1,102 @@
+/**
+ * Shared rendering primitives for bash/eval execution components.
+ *
+ * Each helper isolates a piece of structure both components share verbatim
+ * (frame layout, collapsed preview, post-run status line). Differences in
+ * how each component prepares its header, output lines, or sixel masking
+ * stay in their respective files.
+ */
+
+import { type Component, Container, Loader, Spacer, Text, type TUI } from "@oh-my-pi/pi-tui";
+import { getSymbolTheme, theme } from "../../modes/theme/theme";
+import { formatTruncationMetaNotice, type TruncationMeta } from "../../tools/output-meta";
+import { DynamicBorder } from "./dynamic-border";
+import { truncateToVisualLines } from "./visual-truncate";
+
+export type ExecutionStatus = "running" | "complete" | "cancelled" | "error";
+
+/** Theme color keys valid for an execution frame. */
+export type ExecutionColorKey = "dim" | "bashMode" | "pythonMode";
+
+/**
+ * Build the spacer + top border + content container + bottom border scaffold
+ * that bash and eval execution components share. The caller appends the
+ * header (command vs `>>>` prompt) and the returned loader to
+ * `contentContainer` so per-mode order is preserved.
+ */
+export function buildExecutionFrame(
+	parent: Container,
+	ui: TUI,
+	colorKey: ExecutionColorKey,
+): { contentContainer: Container; loader: Loader } {
+	const borderColor = (str: string) => theme.fg(colorKey, str);
+
+	parent.addChild(new Spacer(1));
+	parent.addChild(new DynamicBorder(borderColor));
+
+	const contentContainer = new Container();
+	parent.addChild(contentContainer);
+
+	const loader = new Loader(
+		ui,
+		spinner => theme.fg(colorKey, spinner),
+		text => theme.fg("muted", text),
+		`Running… (esc to cancel)`,
+		getSymbolTheme().spinnerFrames,
+	);
+
+	parent.addChild(new DynamicBorder(borderColor));
+	return { contentContainer, loader };
+}
+
+/**
+ * Wrap a styled preview block in a render-time visual-line truncator.
+ * Recomputed per render width so wrapping stays in sync with terminal size.
+ */
+export function createCollapsedPreview(previewText: string, previewLines: number): Component {
+	return {
+		render: (width: number) => truncateToVisualLines(previewText, previewLines, width, 1).visualLines,
+		invalidate: () => {},
+	};
+}
+
+/**
+ * Build the post-run status block (hidden-line hint, exit/cancel marker,
+ * truncation notice). Returns undefined when there is nothing to display so
+ * callers can skip appending a stray Text child.
+ */
+export function buildStatusFooter(opts: {
+	status: ExecutionStatus;
+	exitCode: number | undefined;
+	truncation: TruncationMeta | undefined;
+	hiddenLineCount: number;
+	/** Suppress the "… N more lines" hint (used when sixel passthrough renders the full output). */
+	suppressHiddenCount?: boolean;
+}): Text | undefined {
+	const parts: string[] = [];
+
+	if (opts.hiddenLineCount > 0 && !opts.suppressHiddenCount) {
+		parts.push(theme.fg("dim", `… ${opts.hiddenLineCount} more lines (ctrl+o to expand)`));
+	}
+	if (opts.status === "cancelled") {
+		parts.push(theme.fg("warning", "(cancelled)"));
+	} else if (opts.status === "error") {
+		parts.push(theme.fg("error", `(exit ${opts.exitCode})`));
+	}
+	if (opts.truncation) {
+		parts.push(theme.fg("warning", formatTruncationMetaNotice(opts.truncation)));
+	}
+
+	if (parts.length === 0) return undefined;
+	return new Text(`\n${parts.join("\n")}`, 1, 0);
+}
+
+/**
+ * Derive the post-run status from an exit code + cancellation flag using the
+ * same precedence both execution components apply.
+ */
+export function resolveExecutionStatus(exitCode: number | undefined, cancelled: boolean): ExecutionStatus {
+	if (cancelled) return "cancelled";
+	if (exitCode !== 0 && exitCode !== undefined && exitCode !== null) return "error";
+	return "complete";
+}

packages/coding-agent/src/modes/components/hook-message.ts

@@ -1,9 +1,12 @@
-import type { TextContent } from "@oh-my-pi/pi-ai";
 import type { Component } from "@oh-my-pi/pi-tui";
-import { Box, Container, Markdown, Spacer, Text } from "@oh-my-pi/pi-tui";
+import { Box, Container, Spacer } from "@oh-my-pi/pi-tui";
 import type { HookMessageRenderer } from "../../extensibility/hooks/types";
-import { getMarkdownTheme, theme } from "../../modes/theme/theme";
+import { theme } from "../../modes/theme/theme";
 import type { HookMessage } from "../../session/messages";
+import { renderFramedMessage } from "./message-frame";
+
+/** Lines of default markdown body shown before the "…" fold when collapsed. */
+const HOOK_COLLAPSED_LINES = 5;
 
 /**
  * Component that renders a custom message entry from hooks.
@@ -41,60 +44,25 @@ export class HookMessageComponent extends Container {
 	}
 
 	#rebuild(): void {
-		// Remove previous content component
 		if (this.#customComponent) {
 			this.removeChild(this.#customComponent);
 			this.#customComponent = undefined;
 		}
 		this.removeChild(this.#box);
 
-		// Try custom renderer first - it handles its own styling
-		if (this.customRenderer) {
-			try {
-				const component = this.customRenderer(this.message, { expanded: this.#expanded }, theme);
-				if (component) {
-					// Custom renderer provides its own styled component
-					this.#customComponent = component;
-					this.addChild(component);
-					return;
-				}
-			} catch {
-				// Fall through to default rendering
-			}
-		}
+		const custom = renderFramedMessage({
+			message: this.message,
+			box: this.#box,
+			expanded: this.#expanded,
+			customRenderer: this.customRenderer,
+			collapseAfterLines: HOOK_COLLAPSED_LINES,
+		});
 
-		// Default rendering uses our box
-		this.addChild(this.#box);
-		this.#box.clear();
-
-		// Default rendering: label + content
-		const label = theme.fg("customMessageLabel", theme.bold(`[${this.message.customType}]`));
-		this.#box.addChild(new Text(label, 0, 0));
-		this.#box.addChild(new Spacer(1));
-
-		// Extract text content
-		let text: string;
-		if (typeof this.message.content === "string") {
-			text = this.message.content;
+		if (custom) {
+			this.#customComponent = custom;
+			this.addChild(custom);
 		} else {
-			text = this.message.content
-				.filter((c): c is TextContent => c.type === "text")
-				.map(c => c.text)
-				.join("\n");
+			this.addChild(this.#box);
 		}
-
-		// Limit lines when collapsed
-		if (!this.#expanded) {
-			const lines = text.split("\n");
-			if (lines.length > 5) {
-				text = `${lines.slice(0, 5).join("\n")}\n…`;
-			}
-		}
-
-		this.#box.addChild(
-			new Markdown(text, 0, 0, getMarkdownTheme(), {
-				color: (text: string) => theme.fg("customMessageText", text),
-			}),
-		);
 	}
 }

packages/coding-agent/src/modes/components/message-frame.ts

@@ -0,0 +1,88 @@
+/**
+ * Shared rendering for extension/hook custom message frames.
+ *
+ * Both `CustomMessageComponent` and `HookMessageComponent` wrap a
+ * `Spacer(1) + Box` layout, try a user-supplied renderer first, and fall
+ * back to a label + markdown body when the renderer returns nothing or
+ * throws. The only meaningful difference is that hook messages collapse to
+ * the first N lines when not expanded; extension messages render in full.
+ */
+
+import type { TextContent } from "@oh-my-pi/pi-ai";
+import type { Box, Component } from "@oh-my-pi/pi-tui";
+import { Markdown, Spacer, Text } from "@oh-my-pi/pi-tui";
+import { getMarkdownTheme, type Theme, theme } from "../../modes/theme/theme";
+
+/** Message shape consumed by the shared frame. */
+export interface FramedMessage {
+	customType: string;
+	content: string | (TextContent | { type: string })[];
+}
+
+/**
+ * Callable signature shared by `MessageRenderer` (extensions) and
+ * `HookMessageRenderer` (hooks). Both narrow `message` to their own type;
+ * this signature is the structural intersection callers can hand off here.
+ */
+export type FramedRenderer<M extends FramedMessage> = (
+	message: M,
+	options: { expanded: boolean },
+	theme: Theme,
+) => Component | undefined;
+
+export interface RebuildFrameOptions<M extends FramedMessage> {
+	message: M;
+	box: Box;
+	expanded: boolean;
+	/** Collapse the markdown body to this many lines when `expanded` is false. Omit to never collapse. */
+	collapseAfterLines?: number;
+	customRenderer?: FramedRenderer<M>;
+}
+
+/**
+ * Attempt the custom renderer; on failure or undefined return, populate
+ * `box` with the default `[customType]` label + markdown body and return
+ * undefined. When the custom renderer succeeds, return its Component so the
+ * caller can mount it and skip the default box.
+ */
+export function renderFramedMessage<M extends FramedMessage>(opts: RebuildFrameOptions<M>): Component | undefined {
+	if (opts.customRenderer) {
+		try {
+			const component = opts.customRenderer(opts.message, { expanded: opts.expanded }, theme);
+			if (component) return component;
+		} catch {
+			// Fall through to default rendering
+		}
+	}
+
+	opts.box.clear();
+
+	const label = theme.fg("customMessageLabel", theme.bold(`[${opts.message.customType}]`));
+	opts.box.addChild(new Text(label, 0, 0));
+	opts.box.addChild(new Spacer(1));
+
+	let text: string;
+	if (typeof opts.message.content === "string") {
+		text = opts.message.content;
+	} else {
+		text = opts.message.content
+			.filter((c): c is TextContent => c.type === "text")
+			.map(c => c.text)
+			.join("\n");
+	}
+
+	if (!opts.expanded && opts.collapseAfterLines !== undefined) {
+		const lines = text.split("\n");
+		if (lines.length > opts.collapseAfterLines) {
+			text = `${lines.slice(0, opts.collapseAfterLines).join("\n")}\n…`;
+		}
+	}
+
+	opts.box.addChild(
+		new Markdown(text, 0, 0, getMarkdownTheme(), {
+			color: (value: string) => theme.fg("customMessageText", value),
+		}),
+	);
+
+	return undefined;
+}

packages/coding-agent/src/modes/components/model-selector.ts

@@ -2,6 +2,7 @@ import { ThinkingLevel } from "@oh-my-pi/pi-agent-core";
 import { getSupportedEfforts, type Model, modelsAreEqual } from "@oh-my-pi/pi-ai";
 import {
 	Container,
+	fuzzyFilter,
 	getKeybindings,
 	Input,
 	matchesKey,
@@ -18,7 +19,6 @@ import { resolveModelRoleValue } from "../../config/model-resolver";
 import type { Settings } from "../../config/settings";
 import { type ThemeColor, theme } from "../../modes/theme/theme";
 import { getThinkingLevelMetadata } from "../../thinking";
-import { fuzzyFilter } from "../../utils/fuzzy";
 import { getTabBarTheme } from "../shared";
 import { DynamicBorder } from "./dynamic-border";
 

packages/coding-agent/src/modes/components/session-selector.ts

@@ -1,6 +1,7 @@
 import {
 	type Component,
 	Container,
+	fuzzyFilter,
 	Input,
 	matchesKey,
 	padding,
@@ -14,7 +15,6 @@ import { formatBytes } from "@oh-my-pi/pi-utils";
 import { theme } from "../../modes/theme/theme";
 import { matchesAppInterrupt } from "../../modes/utils/keybinding-matchers";
 import type { SessionInfo } from "../../session/session-manager";
-import { fuzzyFilter } from "../../utils/fuzzy";
 import { DynamicBorder } from "./dynamic-border";
 import { HookSelectorComponent } from "./hook-selector";
 

packages/coding-agent/src/modes/controllers/command-controller-shared.ts

@@ -0,0 +1,108 @@
+/**
+ * Shared helpers for /mcp and /ssh command controllers.
+ *
+ * Captures argument parsing, source grouping, and chat-message rendering that
+ * was duplicated between mcp-command-controller and ssh-command-controller.
+ * Intentionally kept narrow: subcommand routing, help text, success/error
+ * wording, and add-flow logic stay in the per-controller files because they
+ * diverge in workflow.
+ */
+import { Spacer, Text } from "@oh-my-pi/pi-tui";
+import type { SourceMeta } from "../../capability/types";
+import { shortenPath } from "../../tools/render-utils";
+import { DynamicBorder } from "../components/dynamic-border";
+import { parseCommandArgs } from "../shared";
+import type { InteractiveModeContext } from "../types";
+
+export type ScopeValue = "project" | "user";
+
+export type ScopeFlagResult = { ok: true; scope: ScopeValue } | { ok: false; error: string };
+
+/**
+ * Validate the value following a `--scope` flag.
+ */
+export function readScopeFlag(value: string | undefined): ScopeFlagResult {
+	if (!value || (value !== "project" && value !== "user")) {
+		return { ok: false, error: "Invalid --scope value. Use project or user." };
+	}
+	return { ok: true, scope: value };
+}
+
+export type RemoveArgs = { name: string | undefined; scope: ScopeValue };
+
+export type ParseRemoveResult = { ok: true; value: RemoveArgs } | { ok: false; error: string };
+
+/**
+ * Parse the argument tail of `/<cmd> remove <name> [--scope project|user]`.
+ *
+ * `rest` is the text after the subcommand keyword. The caller is responsible
+ * for emitting the command-specific "<entity> name required" usage hint when
+ * `value.name` is undefined.
+ */
+export function parseRemoveArgs(rest: string): ParseRemoveResult {
+	const tokens = parseCommandArgs(rest);
+
+	let name: string | undefined;
+	let scope: ScopeValue = "project";
+	let i = 0;
+
+	if (tokens.length > 0 && !tokens[0].startsWith("-")) {
+		name = tokens[0];
+		i = 1;
+	}
+
+	while (i < tokens.length) {
+		const token = tokens[i];
+		if (token === "--scope") {
+			const r = readScopeFlag(tokens[i + 1]);
+			if (!r.ok) return { ok: false, error: r.error };
+			scope = r.scope;
+			i += 2;
+			continue;
+		}
+		return { ok: false, error: `Unknown option: ${token}` };
+	}
+
+	return { ok: true, value: { name, scope } };
+}
+
+/**
+ * Group capability-loaded items by their source provider+path, yielding each
+ * group with a display-ready `shortPath`.
+ */
+export function* groupBySource<T>(
+	items: Iterable<T>,
+	getSource: (item: T) => SourceMeta,
+): Iterable<{ providerName: string; shortPath: string; items: T[] }> {
+	const groups = new Map<string, T[]>();
+	for (const item of items) {
+		const src = getSource(item);
+		const key = `${src.providerName}|${src.path}`;
+		let group = groups.get(key);
+		if (!group) {
+			group = [];
+			groups.set(key, group);
+		}
+		group.push(item);
+	}
+	for (const [key, grouped] of groups) {
+		const sepIdx = key.indexOf("|");
+		yield {
+			providerName: key.slice(0, sepIdx),
+			shortPath: shortenPath(key.slice(sepIdx + 1)),
+			items: grouped,
+		};
+	}
+}
+
+/**
+ * Render a message block (DynamicBorder / Text / DynamicBorder) into the chat
+ * container and request a render.
+ */
+export function showCommandMessage(ctx: InteractiveModeContext, text: string): void {
+	ctx.chatContainer.addChild(new Spacer(1));
+	ctx.chatContainer.addChild(new DynamicBorder());
+	ctx.chatContainer.addChild(new Text(text, 1, 1));
+	ctx.chatContainer.addChild(new DynamicBorder());
+	ctx.ui.requestRender();
+}

packages/coding-agent/src/modes/controllers/mcp-command-controller.ts

@@ -37,11 +37,11 @@ import type { MCPAuthConfig, MCPServerConfig, MCPServerConnection } from "../../
 import type { OAuthCredential } from "../../session/auth-storage";
 import { shortenPath } from "../../tools/render-utils";
 import { openPath } from "../../utils/open";
-import { DynamicBorder } from "../components/dynamic-border";
 import { MCPAddWizard } from "../components/mcp-add-wizard";
 import { parseCommandArgs } from "../shared";
 import { theme } from "../theme/theme";
 import type { InteractiveModeContext } from "../types";
+import { groupBySource, parseRemoveArgs, readScopeFlag, showCommandMessage } from "./command-controller-shared";
 
 function withTimeout<T>(promise: Promise<T>, timeoutMs: number, message: string): Promise<T> {
 	const { promise: timeoutPromise, reject } = Promise.withResolvers<T>();
@@ -207,11 +207,11 @@ export class MCPCommandController {
 				break;
 			}
 			if (argToken === "--scope") {
-				const value = tokens[i + 1];
-				if (!value || (value !== "project" && value !== "user")) {
-					return { scope, error: "Invalid --scope value. Use project or user." };
+				const r = readScopeFlag(tokens[i + 1]);
+				if (!r.ok) {
+					return { scope, error: r.error };
 				}
-				scope = value;
+				scope = r.scope;
 				i += 2;
 				continue;
 			}
@@ -984,23 +984,7 @@ export class MCPCommandController {
 
 			// Show discovered servers (from .claude.json, .cursor/mcp.json, .vscode/mcp.json, etc.)
 			if (discoveredServers.length > 0) {
-				// Group by source display name + path
-				const bySource = new Map<string, typeof discoveredServers>();
-				for (const entry of discoveredServers) {
-					const key = `${entry.source.providerName}|${entry.source.path}`;
-					let group = bySource.get(key);
-					if (!group) {
-						group = [];
-						bySource.set(key, group);
-					}
-					group.push(entry);
-				}
-
-				for (const [key, entries] of bySource) {
-					const sepIdx = key.indexOf("|");
-					const providerName = key.slice(0, sepIdx);
-					const sourcePath = key.slice(sepIdx + 1);
-					const shortPath = shortenPath(sourcePath);
+				for (const { providerName, shortPath, items: entries } of groupBySource(discoveredServers, e => e.source)) {
 					lines.push(theme.fg("accent", providerName) + theme.fg("muted", ` (${shortPath}):`));
 					for (const { name } of entries) {
 						const state = this.ctx.mcpManager!.getConnectionStatus(name);
@@ -1037,32 +1021,12 @@ export class MCPCommandController {
 	async #handleRemove(text: string): Promise<void> {
 		const match = text.match(/^\/mcp\s+(?:remove|rm)\b\s*(.*)$/i);
 		const rest = match?.[1]?.trim() ?? "";
-		const tokens = parseCommandArgs(rest);
-
-		let name: string | undefined;
-		let scope: "project" | "user" = "project";
-		let i = 0;
-
-		if (tokens.length > 0 && !tokens[0].startsWith("-")) {
-			name = tokens[0];
-			i = 1;
-		}
-
-		while (i < tokens.length) {
-			const token = tokens[i];
-			if (token === "--scope") {
-				const value = tokens[i + 1];
-				if (!value || (value !== "project" && value !== "user")) {
-					this.ctx.showError("Invalid --scope value. Use project or user.");
-					return;
-				}
-				scope = value;
-				i += 2;
-				continue;
-			}
-			this.ctx.showError(`Unknown option: ${token}`);
+		const parsed = parseRemoveArgs(rest);
+		if (!parsed.ok) {
+			this.ctx.showError(parsed.error);
 			return;
 		}
+		const { name, scope } = parsed.value;
 
 		if (!name) {
 			this.ctx.showError("Server name required. Usage: /mcp remove <name> [--scope project|user]");
@@ -1929,10 +1893,6 @@ export class MCPCommandController {
 	 * Show a message in the chat
 	 */
 	#showMessage(text: string): void {
-		this.ctx.chatContainer.addChild(new Spacer(1));
-		this.ctx.chatContainer.addChild(new DynamicBorder());
-		this.ctx.chatContainer.addChild(new Text(text, 1, 1));
-		this.ctx.chatContainer.addChild(new DynamicBorder());
-		this.ctx.ui.requestRender();
+		showCommandMessage(this.ctx, text);
 	}
 }

packages/coding-agent/src/modes/controllers/ssh-command-controller.ts

@@ -3,18 +3,20 @@
  *
  * Handles /ssh subcommands for managing SSH host configurations.
  */
-import { Spacer, Text } from "@oh-my-pi/pi-tui";
 import { getProjectDir, getSSHConfigPath } from "@oh-my-pi/pi-utils";
 import { type SSHHost, sshCapability } from "../../capability/ssh";
 import { loadCapability } from "../../discovery";
 import { addSSHHost, readSSHConfigFile, removeSSHHost, type SSHHostConfig } from "../../ssh/config-writer";
-import { shortenPath } from "../../tools/render-utils";
-import { DynamicBorder } from "../components/dynamic-border";
 import { parseCommandArgs } from "../shared";
 import { theme } from "../theme/theme";
 import type { InteractiveModeContext } from "../types";
-
-type SSHAddScope = "user" | "project";
+import {
+	groupBySource,
+	parseRemoveArgs,
+	readScopeFlag,
+	type ScopeValue,
+	showCommandMessage,
+} from "./command-controller-shared";
 
 export class SSHCommandController {
 	constructor(private ctx: InteractiveModeContext) {}
@@ -90,7 +92,7 @@ export class SSHCommandController {
 		}
 
 		let name: string | undefined;
-		let scope: SSHAddScope = "project";
+		let scope: ScopeValue = "project";
 		let host: string | undefined;
 		let username: string | undefined;
 		let port: number | undefined;
@@ -167,12 +169,12 @@ export class SSHCommandController {
 				continue;
 			}
 			if (argToken === "--scope") {
-				const value = tokens[i + 1];
-				if (!value || (value !== "project" && value !== "user")) {
-					this.ctx.showError("Invalid --scope value. Use project or user.");
+				const r = readScopeFlag(tokens[i + 1]);
+				if (!r.ok) {
+					this.ctx.showError(r.error);
 					return;
 				}
-				scope = value;
+				scope = r.scope;
 				i += 2;
 				continue;
 			}
@@ -300,23 +302,7 @@ export class SSHCommandController {
 
 			// Show discovered hosts (from ssh.json, .ssh.json in project root, etc.)
 			if (discoveredHosts.length > 0) {
-				// Group by source
-				const bySource = new Map<string, SSHHost[]>();
-				for (const host of discoveredHosts) {
-					const key = `${host._source.providerName}|${host._source.path}`;
-					let group = bySource.get(key);
-					if (!group) {
-						group = [];
-						bySource.set(key, group);
-					}
-					group.push(host);
-				}
-
-				for (const [key, hosts] of bySource) {
-					const sepIdx = key.indexOf("|");
-					const providerName = key.slice(0, sepIdx);
-					const sourcePath = key.slice(sepIdx + 1);
-					const shortPath = shortenPath(sourcePath);
+				for (const { providerName, shortPath, items: hosts } of groupBySource(discoveredHosts, h => h._source)) {
 					lines.push(
 						theme.fg("accent", "Discovered") +
 							theme.fg("muted", ` (${providerName}: ${shortPath}):`) +
@@ -357,33 +343,12 @@ export class SSHCommandController {
 	async #handleRemove(text: string): Promise<void> {
 		const match = text.match(/^\/ssh\s+(?:remove|rm)\b\s*(.*)$/i);
 		const rest = match?.[1]?.trim() ?? "";
-		const tokens = parseCommandArgs(rest);
-
-		let name: string | undefined;
-		let scope: "project" | "user" = "project";
-		let i = 0;
-
-		if (tokens.length > 0 && !tokens[0].startsWith("-")) {
-			name = tokens[0];
-			i = 1;
-		}
-
-		while (i < tokens.length) {
-			const token = tokens[i];
-			if (token === "--scope") {
-				const value = tokens[i + 1];
-				if (!value || (value !== "project" && value !== "user")) {
-					this.ctx.showError("Invalid --scope value. Use project or user.");
+		const parsed = parseRemoveArgs(rest);
+		if (!parsed.ok) {
+			this.ctx.showError(parsed.error);
 			return;
 		}
-				scope = value;
-				i += 2;
-				continue;
-			}
-			this.ctx.showError(`Unknown option: ${token}`);
-			return;
-		}
-
+		const { name, scope } = parsed.value;
 		if (!name) {
 			this.ctx.showError("Host name required. Usage: /ssh remove <name> [--scope project|user]");
 			return;
@@ -412,10 +377,6 @@ export class SSHCommandController {
 	 * Show a message in the chat
 	 */
 	#showMessage(text: string): void {
-		this.ctx.chatContainer.addChild(new Spacer(1));
-		this.ctx.chatContainer.addChild(new DynamicBorder());
-		this.ctx.chatContainer.addChild(new Text(text, 1, 1));
-		this.ctx.chatContainer.addChild(new DynamicBorder());
-		this.ctx.ui.requestRender();
+		showCommandMessage(this.ctx, text);
 	}
 }

packages/coding-agent/src/modes/print-mode.ts

@@ -7,8 +7,8 @@
  */
 import type { AssistantMessage, ImageContent } from "@oh-my-pi/pi-ai";
 import { sanitizeText } from "@oh-my-pi/pi-natives";
-import { runExtensionCompact, runExtensionSetModel } from "../extensibility/extensions/compact-handler";
 import type { AgentSession } from "../session/agent-session";
+import { initializeExtensions } from "./runtime-init";
 
 /**
  * Options for print mode.
@@ -39,90 +39,16 @@ export async function runPrintMode(session: AgentSession, options: PrintModeOpti
 		}
 	}
 	// Set up extensions for print mode (no UI, no command context)
-	const extensionRunner = session.extensionRunner;
-	if (extensionRunner) {
-		extensionRunner.initialize(
-			// ExtensionActions
-			{
-				sendMessage: (message, options) => {
-					session.sendCustomMessage(message, options).catch(e => {
-						process.stderr.write(`Extension sendMessage failed: ${e instanceof Error ? e.message : String(e)}\n`);
-					});
-				},
-				sendUserMessage: (content, options) => {
-					session.sendUserMessage(content, options).catch(e => {
+	await initializeExtensions(session, {
+		reportSendError: (action, err) => {
 			process.stderr.write(
-							`Extension sendUserMessage failed: ${e instanceof Error ? e.message : String(e)}\n`,
+				`Extension ${action === "extension_send" ? "sendMessage" : "sendUserMessage"} failed: ${err.message}\n`,
 			);
-					});
 		},
-				appendEntry: (customType, data) => {
-					session.sessionManager.appendCustomEntry(customType, data);
-				},
-				setLabel: (targetId, label) => {
-					session.sessionManager.appendLabelChange(targetId, label);
-				},
-				getActiveTools: () => session.getActiveToolNames(),
-				getAllTools: () => session.getAllToolNames(),
-				setActiveTools: (toolNames: string[]) => session.setActiveToolsByName(toolNames),
-				getCommands: () => [],
-				setModel: model => runExtensionSetModel(session, model),
-				getThinkingLevel: () => session.thinkingLevel,
-				setThinkingLevel: level => session.setThinkingLevel(level),
-				getSessionName: () => session.sessionManager.getSessionName(),
-				setSessionName: async name => {
-					await session.sessionManager.setSessionName(name, "user");
-				},
-			},
-			// ExtensionContextActions
-			{
-				getModel: () => session.model,
-				isIdle: () => !session.isStreaming,
-				abort: () => session.abort(),
-				hasPendingMessages: () => session.queuedMessageCount > 0,
-				shutdown: () => {},
-				getContextUsage: () => session.getContextUsage(),
-				getSystemPrompt: () => session.systemPrompt,
-				compact: instructionsOrOptions => runExtensionCompact(session, instructionsOrOptions),
-			},
-			// ExtensionCommandContextActions - commands invokable via prompt("/command")
-			{
-				getContextUsage: () => session.getContextUsage(),
-				waitForIdle: () => session.agent.waitForIdle(),
-				newSession: async options => {
-					const success = await session.newSession({ parentSession: options?.parentSession });
-					if (success && options?.setup) {
-						await options.setup(session.sessionManager);
-					}
-					return { cancelled: !success };
-				},
-				branch: async entryId => {
-					const result = await session.branch(entryId);
-					return { cancelled: result.cancelled };
-				},
-				navigateTree: async (targetId, options) => {
-					const result = await session.navigateTree(targetId, { summarize: options?.summarize });
-					return { cancelled: result.cancelled };
-				},
-				switchSession: async sessionPath => {
-					const success = await session.switchSession(sessionPath);
-					return { cancelled: !success };
-				},
-				reload: async () => {
-					await session.reload();
-				},
-				compact: instructionsOrOptions => runExtensionCompact(session, instructionsOrOptions),
-			},
-			// No UI context
-		);
-		extensionRunner.onError(err => {
+		reportRuntimeError: err => {
 			process.stderr.write(`Extension error (${err.extensionPath}): ${err.error}\n`);
+		},
 	});
-		// Emit session_start event
-		await extensionRunner.emit({
-			type: "session_start",
-		});
-	}
 
 	// Always subscribe to enable session persistence via _handleAgentEvent
 	session.subscribe(event => {

packages/coding-agent/src/modes/rpc/rpc-mode.ts

@@ -17,9 +17,9 @@ import type {
 	ExtensionUIDialogOptions,
 	ExtensionWidgetOptions,
 } from "../../extensibility/extensions";
-import { runExtensionCompact, runExtensionSetModel } from "../../extensibility/extensions/compact-handler";
 import { type Theme, theme } from "../../modes/theme/theme";
 import type { AgentSession } from "../../session/agent-session";
+import { initializeExtensions } from "../runtime-init";
 import { isRpcHostToolResult, isRpcHostToolUpdate, RpcHostToolBridge } from "./host-tools";
 import type {
 	RpcCommand,
@@ -421,91 +421,18 @@ export async function runRpcMode(
 	setToolUIContext?.(rpcUiContext, true);
 
 	// Set up extensions with RPC-based UI context
-	const extensionRunner = session.extensionRunner;
-	if (extensionRunner) {
-		extensionRunner.initialize(
-			// ExtensionActions
-			{
-				sendMessage: (message, options) => {
-					session.sendCustomMessage(message, options).catch(e => {
-						output(error(undefined, "extension_send", e.message));
-					});
+	await initializeExtensions(session, {
+		reportSendError: (action, err) => {
+			output(error(undefined, action, err.message));
 		},
-				sendUserMessage: (content, options) => {
-					session.sendUserMessage(content, options).catch(e => {
-						output(error(undefined, "extension_send_user", e.message));
-					});
+		reportRuntimeError: err => {
+			output({ type: "extension_error", extensionPath: err.extensionPath, event: err.event, error: err.error });
 		},
-				appendEntry: (customType, data) => {
-					session.sessionManager.appendCustomEntry(customType, data);
-				},
-				setLabel: (targetId, label) => {
-					session.sessionManager.appendLabelChange(targetId, label);
-				},
-				getActiveTools: () => session.getActiveToolNames(),
-				getAllTools: () => session.getAllToolNames(),
-				setActiveTools: (toolNames: string[]) => session.setActiveToolsByName(toolNames),
-				getCommands: () => [],
-				setModel: model => runExtensionSetModel(session, model),
-				getThinkingLevel: () => session.thinkingLevel,
-				setThinkingLevel: level => session.setThinkingLevel(level),
-				getSessionName: () => session.sessionManager.getSessionName(),
-				setSessionName: async name => {
-					await session.sessionManager.setSessionName(name, "user");
-				},
-			},
-			// ExtensionContextActions
-			{
-				getModel: () => session.agent.state.model,
-				isIdle: () => !session.isStreaming,
-				abort: () => session.abort(),
-				hasPendingMessages: () => session.queuedMessageCount > 0,
-				shutdown: () => {
+		onShutdown: () => {
 			shutdownState.requested = true;
 		},
-				getContextUsage: () => session.getContextUsage(),
-				getSystemPrompt: () => session.systemPrompt,
-				compact: instructionsOrOptions => runExtensionCompact(session, instructionsOrOptions),
-			},
-			// ExtensionCommandContextActions - commands invokable via prompt("/command")
-			{
-				getContextUsage: () => session.getContextUsage(),
-				waitForIdle: () => session.agent.waitForIdle(),
-				newSession: async options => {
-					const success = await session.newSession({ parentSession: options?.parentSession });
-					// Note: setup callback runs but no UI feedback in RPC mode
-					if (success && options?.setup) {
-						await options.setup(session.sessionManager);
-					}
-					return { cancelled: !success };
-				},
-				branch: async entryId => {
-					const result = await session.branch(entryId);
-					return { cancelled: result.cancelled };
-				},
-				navigateTree: async (targetId, options) => {
-					const result = await session.navigateTree(targetId, { summarize: options?.summarize });
-					return { cancelled: result.cancelled };
-				},
-				switchSession: async sessionPath => {
-					const success = await session.switchSession(sessionPath);
-					return { cancelled: !success };
-				},
-				reload: async () => {
-					await session.reload();
-				},
-				compact: instructionsOrOptions => runExtensionCompact(session, instructionsOrOptions),
-			},
-			rpcUiContext,
-		);
-		extensionRunner.onError(err => {
-			output({ type: "extension_error", extensionPath: err.extensionPath, event: err.event, error: err.error });
+		uiContext: rpcUiContext,
 	});
-		// Emit session_start event
-		await extensionRunner.emit({
-			type: "session_start",
-		});
-	}
 
 	// Output all agent events as JSON
 	session.subscribe(event => {
@@ -850,8 +777,8 @@ export async function runRpcMode(
 	async function checkShutdownRequested(): Promise<void> {
 		if (!shutdownState.requested) return;
 
-		if (extensionRunner?.hasHandlers("session_shutdown")) {
-			await extensionRunner.emit({ type: "session_shutdown" });
+		if (session.extensionRunner?.hasHandlers("session_shutdown")) {
+			await session.extensionRunner.emit({ type: "session_shutdown" });
 		}
 
 		process.exit(0);

packages/coding-agent/src/modes/runtime-init.ts

@@ -0,0 +1,115 @@
+/**
+ * Shared extension runtime wiring for print and RPC modes.
+ *
+ * Both modes initialize the extension runner with the same action handlers
+ * that delegate to the {@link AgentSession}. Only error reporting, shutdown
+ * behavior, and UI context differ between callers — those stay as
+ * caller-supplied hooks.
+ */
+import { runExtensionCompact, runExtensionSetModel } from "../extensibility/extensions/compact-handler";
+import type { ExtensionError, ExtensionUIContext } from "../extensibility/extensions/types";
+import type { AgentSession } from "../session/agent-session";
+
+/** Action name for an extension-originated send failure. */
+export type ExtensionSendAction = "extension_send" | "extension_send_user";
+
+export interface InitializeExtensionsOptions {
+	/** Reports an error thrown by an extension-initiated send. */
+	reportSendError: (action: ExtensionSendAction, error: Error) => void;
+	/** Reports a runtime error surfaced through {@link ExtensionRunner.onError}. */
+	reportRuntimeError: (error: ExtensionError) => void;
+	/** Optional shutdown hook (rpc mode signals its loop; print mode is a no-op). */
+	onShutdown?: () => void;
+	/** Optional UI context (rpc supplies one; print runs headless). */
+	uiContext?: ExtensionUIContext;
+}
+
+/**
+ * Initialize the session's extension runner with the standard action set
+ * shared by non-interactive modes, then emit `session_start`.
+ *
+ * No-op when the session was constructed without an extension runner.
+ */
+export async function initializeExtensions(session: AgentSession, options: InitializeExtensionsOptions): Promise<void> {
+	const runner = session.extensionRunner;
+	if (!runner) return;
+
+	const { reportSendError, reportRuntimeError, onShutdown, uiContext } = options;
+	const shutdown = onShutdown ?? (() => {});
+
+	runner.initialize(
+		// ExtensionActions
+		{
+			sendMessage: (message, sendOptions) => {
+				session.sendCustomMessage(message, sendOptions).catch(e => {
+					reportSendError("extension_send", e instanceof Error ? e : new Error(String(e)));
+				});
+			},
+			sendUserMessage: (content, sendOptions) => {
+				session.sendUserMessage(content, sendOptions).catch(e => {
+					reportSendError("extension_send_user", e instanceof Error ? e : new Error(String(e)));
+				});
+			},
+			appendEntry: (customType, data) => {
+				session.sessionManager.appendCustomEntry(customType, data);
+			},
+			setLabel: (targetId, label) => {
+				session.sessionManager.appendLabelChange(targetId, label);
+			},
+			getActiveTools: () => session.getActiveToolNames(),
+			getAllTools: () => session.getAllToolNames(),
+			setActiveTools: (toolNames: string[]) => session.setActiveToolsByName(toolNames),
+			getCommands: () => [],
+			setModel: model => runExtensionSetModel(session, model),
+			getThinkingLevel: () => session.thinkingLevel,
+			setThinkingLevel: level => session.setThinkingLevel(level),
+			getSessionName: () => session.sessionManager.getSessionName(),
+			setSessionName: async name => {
+				await session.sessionManager.setSessionName(name, "user");
+			},
+		},
+		// ExtensionContextActions
+		{
+			getModel: () => session.model,
+			isIdle: () => !session.isStreaming,
+			abort: () => session.abort(),
+			hasPendingMessages: () => session.queuedMessageCount > 0,
+			shutdown,
+			getContextUsage: () => session.getContextUsage(),
+			getSystemPrompt: () => session.systemPrompt,
+			compact: instructionsOrOptions => runExtensionCompact(session, instructionsOrOptions),
+		},
+		// ExtensionCommandContextActions — commands invokable via prompt("/command")
+		{
+			getContextUsage: () => session.getContextUsage(),
+			waitForIdle: () => session.agent.waitForIdle(),
+			newSession: async newOptions => {
+				const success = await session.newSession({ parentSession: newOptions?.parentSession });
+				if (success && newOptions?.setup) {
+					await newOptions.setup(session.sessionManager);
+				}
+				return { cancelled: !success };
+			},
+			branch: async entryId => {
+				const result = await session.branch(entryId);
+				return { cancelled: result.cancelled };
+			},
+			navigateTree: async (targetId, navOptions) => {
+				const result = await session.navigateTree(targetId, { summarize: navOptions?.summarize });
+				return { cancelled: result.cancelled };
+			},
+			switchSession: async sessionPath => {
+				const success = await session.switchSession(sessionPath);
+				return { cancelled: !success };
+			},
+			reload: async () => {
+				await session.reload();
+			},
+			compact: instructionsOrOptions => runExtensionCompact(session, instructionsOrOptions),
+		},
+		uiContext,
+	);
+
+	runner.onError(reportRuntimeError);
+	await runner.emit({ type: "session_start" });
+}

packages/coding-agent/src/modes/theme/theme.ts

@@ -2332,12 +2332,12 @@ export function getSymbolTheme(): SymbolTheme {
 	};
 }
 
-let _markdownTheme: MarkdownTheme | undefined;
-let _markdownThemeRef: Theme | undefined;
+let cachedMarkdownTheme: MarkdownTheme | undefined;
+let cachedMarkdownThemeRef: Theme | undefined;
 
 export function getMarkdownTheme(): MarkdownTheme {
-	if (_markdownTheme !== undefined && _markdownThemeRef === theme) {
-		return _markdownTheme;
+	if (cachedMarkdownTheme !== undefined && cachedMarkdownThemeRef === theme) {
+		return cachedMarkdownTheme;
 	}
 	const markdownTheme: MarkdownTheme = {
 		heading: (text: string) => theme.fg("mdHeading", text),
@@ -2365,8 +2365,8 @@ export function getMarkdownTheme(): MarkdownTheme {
 			}
 		},
 	};
-	_markdownTheme = markdownTheme;
-	_markdownThemeRef = theme;
+	cachedMarkdownTheme = markdownTheme;
+	cachedMarkdownThemeRef = theme;
 	return markdownTheme;
 }
 

packages/coding-agent/src/modes/utils/ui-helpers.ts

@@ -245,7 +245,7 @@ export class UiHelpers {
 				break;
 			}
 			default: {
-				const _exhaustive: never = message;
+				message satisfies never;
 			}
 		}
 		return [];

packages/coding-agent/src/session/agent-session.ts

@@ -4684,8 +4684,6 @@ export class AgentSession {
 
 			let hookCompaction: CompactionResult | undefined;
 			let fromExtension = false;
-			let hookContext: string[] | undefined;
-			let hookPrompt: string | undefined;
 			let preserveData: Record<string, unknown> | undefined;
 
 			if (this.#extensionRunner?.hasHandlers("session_before_compact")) {
@@ -4707,23 +4705,7 @@ export class AgentSession {
 				}
 			}
 
-			if (!hookCompaction && this.#extensionRunner?.hasHandlers("session.compacting")) {
-				const compactMessages = preparation.messagesToSummarize.concat(preparation.turnPrefixMessages);
-				const result = (await this.#extensionRunner.emit({
-					type: "session.compacting",
-					sessionId: this.sessionId,
-					messages: compactMessages,
-				})) as { context?: string[]; prompt?: string; preserveData?: Record<string, unknown> } | undefined;
-
-				hookContext = result?.context;
-				hookPrompt = result?.prompt;
-				preserveData = result?.preserveData;
-			}
-
-			const memoryBackendContext = await this.#collectMemoryBackendContext(preparation);
-			if (memoryBackendContext) {
-				hookContext = hookContext ? [...hookContext, memoryBackendContext] : [memoryBackendContext];
-			}
+			const compactionPrep = await this.#prepareCompactionFromHooks(preparation, hookCompaction);
 
 			let summary: string;
 			let shortSummary: string | undefined;
@@ -4731,14 +4713,13 @@ export class AgentSession {
 			let tokensBefore: number;
 			let details: unknown;
 
-			if (hookCompaction) {
-				// Extension provided compaction content
-				summary = hookCompaction.summary;
-				shortSummary = hookCompaction.shortSummary;
-				firstKeptEntryId = hookCompaction.firstKeptEntryId;
-				tokensBefore = hookCompaction.tokensBefore;
-				details = hookCompaction.details;
-				preserveData ??= hookCompaction.preserveData;
+			if (compactionPrep.kind === "fromHook") {
+				summary = compactionPrep.summary;
+				shortSummary = compactionPrep.shortSummary;
+				firstKeptEntryId = compactionPrep.firstKeptEntryId;
+				tokensBefore = compactionPrep.tokensBefore;
+				details = compactionPrep.details;
+				preserveData = compactionPrep.preserveData;
 			} else {
 				// Generate compaction result. Only convert known abort-shaped
 				// rejections (AbortError raised while the abort signal is set,
@@ -4757,8 +4738,8 @@ export class AgentSession {
 						customInstructions,
 						compactionAbortController.signal,
 						{
-							promptOverride: hookPrompt,
-							extraContext: hookContext,
+							promptOverride: compactionPrep.hookPrompt,
+							extraContext: compactionPrep.hookContext,
 							remoteInstructions: this.#baseSystemPrompt.join("\n\n"),
 						},
 					);
@@ -4767,7 +4748,7 @@ export class AgentSession {
 					firstKeptEntryId = result.firstKeptEntryId;
 					tokensBefore = result.tokensBefore;
 					details = result.details;
-					preserveData = { ...(preserveData ?? {}), ...(result.preserveData ?? {}) };
+					preserveData = { ...(compactionPrep.preserveData ?? {}), ...(result.preserveData ?? {}) };
 				} catch (err) {
 					if (err instanceof CompactionCancelledError) {
 						throw err;
@@ -5727,6 +5708,64 @@ export class AgentSession {
 		throw this.#buildCompactionAuthError();
 	}
 
+	async #prepareCompactionFromHooks(
+		preparation: CompactionPreparation,
+		hookCompaction: CompactionResult | undefined,
+	): Promise<
+		| {
+				kind: "fromHook";
+				summary: string;
+				shortSummary: string | undefined;
+				firstKeptEntryId: string;
+				tokensBefore: number;
+				details: unknown;
+				preserveData: Record<string, unknown> | undefined;
+		  }
+		| {
+				kind: "needsLlm";
+				hookContext: string[] | undefined;
+				hookPrompt: string | undefined;
+				preserveData: Record<string, unknown> | undefined;
+		  }
+	> {
+		let hookContext: string[] | undefined;
+		let hookPrompt: string | undefined;
+		let preserveData: Record<string, unknown> | undefined;
+
+		if (!hookCompaction && this.#extensionRunner?.hasHandlers("session.compacting")) {
+			const compactMessages = preparation.messagesToSummarize.concat(preparation.turnPrefixMessages);
+			const result = (await this.#extensionRunner.emit({
+				type: "session.compacting",
+				sessionId: this.sessionId,
+				messages: compactMessages,
+			})) as { context?: string[]; prompt?: string; preserveData?: Record<string, unknown> } | undefined;
+
+			hookContext = result?.context;
+			hookPrompt = result?.prompt;
+			preserveData = result?.preserveData;
+		}
+
+		const memoryBackendContext = await this.#collectMemoryBackendContext(preparation);
+		if (memoryBackendContext) {
+			hookContext = hookContext ? [...hookContext, memoryBackendContext] : [memoryBackendContext];
+		}
+
+		if (hookCompaction) {
+			preserveData ??= hookCompaction.preserveData;
+			return {
+				kind: "fromHook",
+				summary: hookCompaction.summary,
+				shortSummary: hookCompaction.shortSummary,
+				firstKeptEntryId: hookCompaction.firstKeptEntryId,
+				tokensBefore: hookCompaction.tokensBefore,
+				details: hookCompaction.details,
+				preserveData,
+			};
+		}
+
+		return { kind: "needsLlm", hookContext, hookPrompt, preserveData };
+	}
+
 	/**
 	 * Internal: Run auto-compaction with events.
 	 */
@@ -5848,8 +5887,6 @@ export class AgentSession {
 
 			let hookCompaction: CompactionResult | undefined;
 			let fromExtension = false;
-			let hookContext: string[] | undefined;
-			let hookPrompt: string | undefined;
 			let preserveData: Record<string, unknown> | undefined;
 
 			if (this.#extensionRunner?.hasHandlers("session_before_compact")) {
@@ -5878,23 +5915,7 @@ export class AgentSession {
 				}
 			}
 
-			if (!hookCompaction && this.#extensionRunner?.hasHandlers("session.compacting")) {
-				const compactMessages = preparation.messagesToSummarize.concat(preparation.turnPrefixMessages);
-				const result = (await this.#extensionRunner.emit({
-					type: "session.compacting",
-					sessionId: this.sessionId,
-					messages: compactMessages,
-				})) as { context?: string[]; prompt?: string; preserveData?: Record<string, unknown> } | undefined;
-
-				hookContext = result?.context;
-				hookPrompt = result?.prompt;
-				preserveData = result?.preserveData;
-			}
-
-			const memoryBackendContext = await this.#collectMemoryBackendContext(preparation);
-			if (memoryBackendContext) {
-				hookContext = hookContext ? [...hookContext, memoryBackendContext] : [memoryBackendContext];
-			}
+			const compactionPrep = await this.#prepareCompactionFromHooks(preparation, hookCompaction);
 
 			let summary: string;
 			let shortSummary: string | undefined;
@@ -5902,14 +5923,13 @@ export class AgentSession {
 			let tokensBefore: number;
 			let details: unknown;
 
-			if (hookCompaction) {
-				// Extension provided compaction content
-				summary = hookCompaction.summary;
-				shortSummary = hookCompaction.shortSummary;
-				firstKeptEntryId = hookCompaction.firstKeptEntryId;
-				tokensBefore = hookCompaction.tokensBefore;
-				details = hookCompaction.details;
-				preserveData ??= hookCompaction.preserveData;
+			if (compactionPrep.kind === "fromHook") {
+				summary = compactionPrep.summary;
+				shortSummary = compactionPrep.shortSummary;
+				firstKeptEntryId = compactionPrep.firstKeptEntryId;
+				tokensBefore = compactionPrep.tokensBefore;
+				details = compactionPrep.details;
+				preserveData = compactionPrep.preserveData;
 			} else {
 				const candidates = this.#getCompactionModelCandidates(availableModels);
 				const retrySettings = this.settings.getGroup("retry");
@@ -5924,8 +5944,8 @@ export class AgentSession {
 					while (true) {
 						try {
 							compactResult = await compact(preparation, candidate, apiKey, undefined, autoCompactionSignal, {
-								promptOverride: hookPrompt,
-								extraContext: hookContext,
+								promptOverride: compactionPrep.hookPrompt,
+								extraContext: compactionPrep.hookContext,
 								remoteInstructions: this.#baseSystemPrompt.join("\n\n"),
 								metadata: this.agent.metadataForProvider(candidate.provider),
 								initiatorOverride: "agent",
@@ -6003,7 +6023,7 @@ export class AgentSession {
 				firstKeptEntryId = compactResult.firstKeptEntryId;
 				tokensBefore = compactResult.tokensBefore;
 				details = compactResult.details;
-				preserveData = { ...(preserveData ?? {}), ...(compactResult.preserveData ?? {}) };
+				preserveData = { ...(compactionPrep.preserveData ?? {}), ...(compactResult.preserveData ?? {}) };
 			}
 
 			if (autoCompactionSignal.aborted) {

packages/coding-agent/src/session/messages.ts

@@ -364,8 +364,7 @@ export function convertToLlm(messages: AgentMessage[]): Message[] {
 						attribution: m.attribution ?? "agent",
 					};
 				default:
-					// biome-ignore lint/correctness/noSwitchDeclarations: fine
-					const _exhaustiveCheck: never = m;
+					m satisfies never;
 					return undefined;
 			}
 		})

packages/coding-agent/src/tools/ast-edit.ts

@@ -7,33 +7,27 @@ import { $envpos, prompt, untilAborted } from "@oh-my-pi/pi-utils";
 import { type Static, Type } from "@sinclair/typebox";
 import type { RenderResultOptions } from "../extensibility/custom-tools/types";
 import { computeLineHash, HL_BODY_SEP } from "../hashline/hash";
-import { InternalUrlRouter } from "../internal-urls";
 import type { Theme } from "../modes/theme/theme";
 import astEditDescription from "../prompts/tools/ast-edit.md" with { type: "text" };
-import { Ellipsis, Hasher, type RenderCache, renderStatusLine, renderTreeList, truncateToWidth } from "../tui";
+import { Ellipsis, renderStatusLine, renderTreeList, truncateToWidth } from "../tui";
 import { resolveFileDisplayMode } from "../utils/file-display-mode";
 import type { ToolSession } from ".";
 import { createFileRecorder, formatResultPath } from "./file-recorder";
 import { formatGroupedFiles } from "./grouped-file-output";
 import type { OutputMeta } from "./output-meta";
+import { resolveToolSearchScope } from "./path-utils";
 import {
-	formatPathRelativeToCwd,
-	hasGlobPathChars,
-	normalizePathLikeInput,
-	parseSearchPath,
-	partitionExistingPaths,
-	resolveExplicitSearchPaths,
-	resolveToCwd,
-} from "./path-utils";
-import {
+	appendParseErrorsBulletList,
+	createCachedComponent,
 	dedupeParseErrors,
 	formatCodeFrameLine,
 	formatCount,
 	formatEmptyMessage,
 	formatErrorMessage,
 	formatParseErrors,
-	PARSE_ERRORS_LIMIT,
+	formatParseErrorsCountLabel,
 	PREVIEW_LIMITS,
+	splitGroupsByBlankLine,
 } from "./render-utils";
 import { queueResolveHandler } from "./resolve";
 import { ToolError } from "./tool-errors";
@@ -205,63 +199,12 @@ export class AstEditTool implements AgentTool<typeof astEditSchema, AstEditToolD
 			const normalizedRewrites = Object.fromEntries(ops);
 			const maxFiles = $envpos("PI_MAX_AST_FILES", 1000);
 
-			const formatScopePath = (targetPath: string): string => formatPathRelativeToCwd(targetPath, this.session.cwd);
-			let searchPath: string;
-			let scopePath: string;
-			let globFilter: string | undefined;
-			let multiTargets: Array<{ basePath: string; glob?: string }> | undefined;
-			const rawPaths = params.paths.map(normalizePathLikeInput);
-			if (rawPaths.some(rawPath => rawPath.length === 0)) {
-				throw new ToolError("`paths` must contain non-empty paths or globs");
-			}
-			const internalRouter = InternalUrlRouter.instance();
-			const resolvedPathInputs: string[] = [];
-			for (const rawPath of rawPaths) {
-				if (!internalRouter.canHandle(rawPath)) {
-					resolvedPathInputs.push(rawPath);
-					continue;
-				}
-				if (hasGlobPathChars(rawPath)) {
-					throw new ToolError(`Glob patterns are not supported for internal URLs: ${rawPath}`);
-				}
-				const resource = await internalRouter.resolve(rawPath);
-				if (!resource.sourcePath) {
-					throw new ToolError(`Cannot rewrite internal URL without backing file: ${rawPath}`);
-				}
-				resolvedPathInputs.push(resource.sourcePath);
-			}
-			let effectivePathInputs = resolvedPathInputs;
-			if (resolvedPathInputs.length > 1) {
-				const partition = await partitionExistingPaths(resolvedPathInputs, this.session.cwd, parseSearchPath);
-				if (partition.valid.length === 0) {
-					throw new ToolError(`Path not found: ${partition.missing.join(", ")}`);
-				}
-				effectivePathInputs = partition.valid;
-			}
-			if (effectivePathInputs.length === 1) {
-				const parsedPath = parseSearchPath(effectivePathInputs[0] ?? ".");
-				searchPath = resolveToCwd(parsedPath.basePath, this.session.cwd);
-				globFilter = parsedPath.glob;
-				scopePath = formatScopePath(searchPath);
-			} else {
-				const multiSearchPath = await resolveExplicitSearchPaths(effectivePathInputs, this.session.cwd, globFilter);
-				if (!multiSearchPath) {
-					throw new ToolError("`paths` must contain at least one path or glob");
-				}
-				searchPath = multiSearchPath.basePath;
-				globFilter = multiSearchPath.targets ? undefined : multiSearchPath.glob;
-				multiTargets = multiSearchPath.targets;
-				scopePath = multiSearchPath.scopePath;
-			}
-			const resolvedSearchPath = searchPath;
-			scopePath = scopePath ?? formatScopePath(resolvedSearchPath);
-			let isDirectory: boolean;
-			try {
-				const stat = await Bun.file(resolvedSearchPath).stat();
-				isDirectory = stat.isDirectory();
-			} catch {
-				throw new ToolError(`Path not found: ${scopePath}`);
-			}
+			const scope = await resolveToolSearchScope({
+				rawPaths: params.paths,
+				cwd: this.session.cwd,
+				internalUrlAction: "rewrite",
+			});
+			const { searchPath: resolvedSearchPath, scopePath, isDirectory, multiTargets, globFilter } = scope;
 
 			const result = await runAstEditOnce(multiTargets, resolvedSearchPath, globFilter, {
 				rewrites: normalizedRewrites,
@@ -502,15 +445,7 @@ export const astEditToolRenderer = {
 			if (filesSearched > 0) meta.push(`searched ${filesSearched}`);
 			const header = renderStatusLine({ icon: "warning", title: "AST Edit", description, meta }, uiTheme);
 			const lines = [header, formatEmptyMessage("No replacements made", uiTheme)];
-			if (details?.parseErrors?.length) {
-				const capped = details.parseErrors.slice(0, PARSE_ERRORS_LIMIT);
-				for (const err of capped) {
-					lines.push(uiTheme.fg("warning", `  - ${err}`));
-				}
-				if (details.parseErrors.length > PARSE_ERRORS_LIMIT) {
-					lines.push(uiTheme.fg("dim", `  … ${details.parseErrors.length - PARSE_ERRORS_LIMIT} more`));
-				}
-			}
+			appendParseErrorsBulletList(lines, details?.parseErrors, uiTheme);
 			return new Text(lines.join("\n"), 0, 0);
 		}
 
@@ -523,28 +458,7 @@ export const astEditToolRenderer = {
 		const description = rewriteCount === 1 ? args?.ops?.[0]?.pat : undefined;
 
 		const textContent = result.details?.displayContent ?? result.content?.find(c => c.type === "text")?.text ?? "";
-		const rawLines = textContent.split("\n");
-		const hasSeparators = rawLines.some(line => line.trim().length === 0);
-		const allGroups: string[][] = [];
-		if (hasSeparators) {
-			let current: string[] = [];
-			for (const line of rawLines) {
-				if (line.trim().length === 0) {
-					if (current.length > 0) {
-						allGroups.push(current);
-						current = [];
-					}
-					continue;
-				}
-				current.push(line);
-			}
-			if (current.length > 0) allGroups.push(current);
-		} else {
-			const nonEmpty = rawLines.filter(line => line.trim().length > 0);
-			if (nonEmpty.length > 0) {
-				allGroups.push(nonEmpty);
-			}
-		}
+		const allGroups = splitGroupsByBlankLine(textContent.split("\n"));
 		const changeGroups = allGroups.filter(
 			group => !group[0]?.startsWith("Safety cap reached") && !group[0]?.startsWith("Parse issues:"),
 		);
@@ -560,23 +474,15 @@ export const astEditToolRenderer = {
 			extraLines.push(uiTheme.fg("warning", "limit reached; narrow path"));
 		}
 		if (details?.parseErrors?.length) {
-			const total = details.parseErrors.length;
-			const label =
-				total > PARSE_ERRORS_LIMIT
-					? `${PARSE_ERRORS_LIMIT} / ${total} parse issues`
-					: `${total} parse issue${total !== 1 ? "s" : ""}`;
-			extraLines.push(uiTheme.fg("warning", label));
+			extraLines.push(uiTheme.fg("warning", formatParseErrorsCountLabel(details.parseErrors)));
 		}
-		let cached: RenderCache | undefined;
-		return {
-			render(width: number): string[] {
-				const { expanded } = options;
-				const key = new Hasher().bool(expanded).u32(width).digest();
-				if (cached?.key === key) return cached.lines;
+		return createCachedComponent(
+			() => options.expanded,
+			width => {
 				const changeLines = renderTreeList(
 					{
 						items: changeGroups,
-						expanded,
+						expanded: options.expanded,
 						maxCollapsed: changeGroups.length,
 						maxCollapsedLines: COLLAPSED_CHANGE_LIMIT,
 						itemType: "change",
@@ -591,14 +497,9 @@ export const astEditToolRenderer = {
 					},
 					uiTheme,
 				);
-				const rendered = [header, ...changeLines, ...extraLines].map(l => truncateToWidth(l, width, Ellipsis.Omit));
-				cached = { key, lines: rendered };
-				return rendered;
+				return [header, ...changeLines, ...extraLines].map(l => truncateToWidth(l, width, Ellipsis.Omit));
 			},
-			invalidate() {
-				cached = undefined;
-			},
-		};
+		);
 	},
 	mergeCallAndResult: true,
 };

packages/coding-agent/src/tools/ast-grep.ts

@@ -6,34 +6,28 @@ import { Text } from "@oh-my-pi/pi-tui";
 import { prompt, untilAborted } from "@oh-my-pi/pi-utils";
 import { type Static, Type } from "@sinclair/typebox";
 import type { RenderResultOptions } from "../extensibility/custom-tools/types";
-import { InternalUrlRouter } from "../internal-urls";
 import type { Theme } from "../modes/theme/theme";
 import astGrepDescription from "../prompts/tools/ast-grep.md" with { type: "text" };
-import { Ellipsis, Hasher, type RenderCache, renderStatusLine, renderTreeList, truncateToWidth } from "../tui";
+import { Ellipsis, renderStatusLine, renderTreeList, truncateToWidth } from "../tui";
 import { resolveFileDisplayMode } from "../utils/file-display-mode";
 import type { ToolSession } from ".";
 import { createFileRecorder, formatResultPath } from "./file-recorder";
 import { formatGroupedFiles } from "./grouped-file-output";
 import { formatMatchLine } from "./match-line-format";
 import type { OutputMeta } from "./output-meta";
+import { resolveToolSearchScope } from "./path-utils";
 import {
-	formatPathRelativeToCwd,
-	hasGlobPathChars,
-	normalizePathLikeInput,
-	parseSearchPath,
-	partitionExistingPaths,
-	resolveExplicitSearchPaths,
-	resolveToCwd,
-} from "./path-utils";
-import {
+	appendParseErrorsBulletList,
+	createCachedComponent,
 	dedupeParseErrors,
 	formatCodeFrameLine,
 	formatCount,
 	formatEmptyMessage,
 	formatErrorMessage,
 	formatParseErrors,
-	PARSE_ERRORS_LIMIT,
+	formatParseErrorsCountLabel,
 	PREVIEW_LIMITS,
+	splitGroupsByBlankLine,
 } from "./render-utils";
 import { ToolError } from "./tool-errors";
 import { toolResult } from "./tool-result";
@@ -150,64 +144,12 @@ export class AstGrepTool implements AgentTool<typeof astGrepSchema, AstGrepToolD
 			if (!Number.isFinite(skip) || skip < 0) {
 				throw new ToolError("skip must be a non-negative number");
 			}
-			const formatScopePath = (targetPath: string): string => formatPathRelativeToCwd(targetPath, this.session.cwd);
-			let searchPath: string;
-			let scopePath: string;
-			let globFilter: string | undefined;
-			let multiTargets: Array<{ basePath: string; glob?: string }> | undefined;
-			const rawPaths = params.paths.map(normalizePathLikeInput);
-			if (rawPaths.some(rawPath => rawPath.length === 0)) {
-				throw new ToolError("`paths` must contain non-empty paths or globs");
-			}
-			const internalRouter = InternalUrlRouter.instance();
-			const resolvedPathInputs: string[] = [];
-			for (const rawPath of rawPaths) {
-				if (!internalRouter.canHandle(rawPath)) {
-					resolvedPathInputs.push(rawPath);
-					continue;
-				}
-				if (hasGlobPathChars(rawPath)) {
-					throw new ToolError(`Glob patterns are not supported for internal URLs: ${rawPath}`);
-				}
-				const resource = await internalRouter.resolve(rawPath);
-				if (!resource.sourcePath) {
-					throw new ToolError(`Cannot search internal URL without backing file: ${rawPath}`);
-				}
-				resolvedPathInputs.push(resource.sourcePath);
-			}
-			let effectivePathInputs = resolvedPathInputs;
-			if (resolvedPathInputs.length > 1) {
-				const partition = await partitionExistingPaths(resolvedPathInputs, this.session.cwd, parseSearchPath);
-				if (partition.valid.length === 0) {
-					throw new ToolError(`Path not found: ${partition.missing.join(", ")}`);
-				}
-				effectivePathInputs = partition.valid;
-			}
-			if (effectivePathInputs.length === 1) {
-				const parsedPath = parseSearchPath(effectivePathInputs[0] ?? ".");
-				searchPath = resolveToCwd(parsedPath.basePath, this.session.cwd);
-				globFilter = parsedPath.glob;
-				scopePath = formatScopePath(searchPath);
-			} else {
-				const multiSearchPath = await resolveExplicitSearchPaths(effectivePathInputs, this.session.cwd, globFilter);
-				if (!multiSearchPath) {
-					throw new ToolError("`paths` must contain at least one path or glob");
-				}
-				searchPath = multiSearchPath.basePath;
-				globFilter = multiSearchPath.targets ? undefined : multiSearchPath.glob;
-				multiTargets = multiSearchPath.targets;
-				scopePath = multiSearchPath.scopePath;
-			}
-
-			const resolvedSearchPath = searchPath;
-			scopePath = scopePath ?? formatScopePath(resolvedSearchPath);
-			let isDirectory: boolean;
-			try {
-				const stat = await Bun.file(resolvedSearchPath).stat();
-				isDirectory = stat.isDirectory();
-			} catch {
-				throw new ToolError(`Path not found: ${scopePath}`);
-			}
+			const scope = await resolveToolSearchScope({
+				rawPaths: params.paths,
+				cwd: this.session.cwd,
+				internalUrlAction: "search",
+			});
+			const { searchPath: resolvedSearchPath, scopePath, isDirectory, multiTargets, globFilter } = scope;
 
 			const DEFAULT_AST_LIMIT = 50;
 			const result = multiTargets
@@ -388,13 +330,7 @@ export const astGrepToolRenderer = {
 			const lines = [header, formatEmptyMessage("No matches found", uiTheme)];
 			if (details?.parseErrors?.length) {
 				lines.push(uiTheme.fg("warning", "Query may be mis-scoped; narrow `paths` before concluding absence"));
-				const capped = details.parseErrors.slice(0, PARSE_ERRORS_LIMIT);
-				for (const err of capped) {
-					lines.push(uiTheme.fg("warning", `  - ${err}`));
-				}
-				if (details.parseErrors.length > PARSE_ERRORS_LIMIT) {
-					lines.push(uiTheme.fg("dim", `  … ${details.parseErrors.length - PARSE_ERRORS_LIMIT} more`));
-				}
+				appendParseErrorsBulletList(lines, details.parseErrors, uiTheme);
 			}
 			return new Text(lines.join("\n"), 0, 0);
 		}
@@ -411,28 +347,7 @@ export const astGrepToolRenderer = {
 		);
 
 		const textContent = result.details?.displayContent ?? result.content?.find(c => c.type === "text")?.text ?? "";
-		const rawLines = textContent.split("\n");
-		const hasSeparators = rawLines.some(line => line.trim().length === 0);
-		const allGroups: string[][] = [];
-		if (hasSeparators) {
-			let current: string[] = [];
-			for (const line of rawLines) {
-				if (line.trim().length === 0) {
-					if (current.length > 0) {
-						allGroups.push(current);
-						current = [];
-					}
-					continue;
-				}
-				current.push(line);
-			}
-			if (current.length > 0) allGroups.push(current);
-		} else {
-			const nonEmpty = rawLines.filter(line => line.trim().length > 0);
-			if (nonEmpty.length > 0) {
-				allGroups.push(nonEmpty);
-			}
-		}
+		const allGroups = splitGroupsByBlankLine(textContent.split("\n"));
 		const matchGroups = allGroups.filter(
 			group => !group[0]?.startsWith("Result limit reached") && !group[0]?.startsWith("Parse issues:"),
 		);
@@ -442,24 +357,16 @@ export const astGrepToolRenderer = {
 			extraLines.push(uiTheme.fg("warning", "limit reached; narrow paths or increase limit"));
 		}
 		if (details?.parseErrors?.length) {
-			const total = details.parseErrors.length;
-			const label =
-				total > PARSE_ERRORS_LIMIT
-					? `${PARSE_ERRORS_LIMIT} / ${total} parse issues`
-					: `${total} parse issue${total !== 1 ? "s" : ""}`;
-			extraLines.push(uiTheme.fg("warning", label));
+			extraLines.push(uiTheme.fg("warning", formatParseErrorsCountLabel(details.parseErrors)));
 		}
 
-		let cached: RenderCache | undefined;
-		return {
-			render(width: number): string[] {
-				const { expanded } = options;
-				const key = new Hasher().bool(expanded).u32(width).digest();
-				if (cached?.key === key) return cached.lines;
+		return createCachedComponent(
+			() => options.expanded,
+			width => {
 				const matchLines = renderTreeList(
 					{
 						items: matchGroups,
-						expanded,
+						expanded: options.expanded,
 						maxCollapsed: matchGroups.length,
 						maxCollapsedLines: COLLAPSED_MATCH_LIMIT,
 						itemType: "match",
@@ -473,14 +380,9 @@ export const astGrepToolRenderer = {
 					},
 					uiTheme,
 				);
-				const rendered = [header, ...matchLines, ...extraLines].map(l => truncateToWidth(l, width, Ellipsis.Omit));
-				cached = { key, lines: rendered };
-				return rendered;
+				return [header, ...matchLines, ...extraLines].map(l => truncateToWidth(l, width, Ellipsis.Omit));
 			},
-			invalidate() {
-				cached = undefined;
-			},
-		};
+		);
 	},
 	mergeCallAndResult: true,
 };

packages/coding-agent/src/tools/browser/attach.ts

@@ -3,7 +3,7 @@ import { Process, ProcessStatus } from "@oh-my-pi/pi-natives";
 import type { Browser, Page } from "puppeteer-core";
 import { ToolError, throwIfAborted } from "../tool-errors";
 
-export const ATTACH_TARGET_SKIP_PATTERN =
+const ATTACH_TARGET_SKIP_PATTERN =
 	/request[\s_-]?handler|devtools|background[\s_-]?(?:page|host)|service[\s_-]?worker/i;
 
 /**
@@ -62,7 +62,7 @@ export async function waitForCdp(cdpUrl: string, timeoutMs: number, signal?: Abo
  * accepts both `--flag=value` and `--flag value`). Returns null if absent or
  * malformed.
  */
-export function findCdpPortInArgs(args: string[]): number | null {
+function findCdpPortInArgs(args: string[]): number | null {
 	for (const arg of args) {
 		const m = /^--remote-debugging-port=(\d+)$/.exec(arg);
 		if (m) {
@@ -80,7 +80,7 @@ export function findCdpPortInArgs(args: string[]): number | null {
 }
 
 /** One-shot probe: returns true when `/json/version` answers 200 within the timeout. */
-export async function probeCdpAt(port: number, signal?: AbortSignal): Promise<boolean> {
+async function probeCdpAt(port: number, signal?: AbortSignal): Promise<boolean> {
 	const probeTimeout = AbortSignal.timeout(1500);
 	const probeSignal = signal ? AbortSignal.any([signal, probeTimeout]) : probeTimeout;
 	try {

packages/coding-agent/src/tools/browser/launch.ts

@@ -30,12 +30,12 @@ export const DEFAULT_VIEWPORT = { width: 1365, height: 768, deviceScaleFactor: 1
  * connection dropped, etc.).
  */
 export const BROWSER_PROTOCOL_TIMEOUT_MS = 60_000;
-export const STEALTH_IGNORE_DEFAULT_ARGS = [
+const STEALTH_IGNORE_DEFAULT_ARGS = [
 	"--disable-extensions",
 	"--disable-default-apps",
 	"--disable-component-extensions-with-background-pages",
 ];
-export const STEALTH_ACCEPT_LANGUAGE = "en-US,en";
+const STEALTH_ACCEPT_LANGUAGE = "en-US,en";
 
 const PUPPETEER_SOURCE_URL_SUFFIX = "//# sourceURL=__puppeteer_evaluation_script__";
 
@@ -82,7 +82,7 @@ export async function loadPuppeteerInWorker(safeDir: string): Promise<typeof Pup
  * The browser is cached under ~/.omp/puppeteer (getPuppeteerDir).
  */
 let chromiumExecutablePromise: Promise<string | undefined> | undefined;
-export async function ensureChromiumExecutable(): Promise<string | undefined> {
+async function ensureChromiumExecutable(): Promise<string | undefined> {
 	const sysChrome = resolveSystemChromium();
 	if (sysChrome) return sysChrome;
 	const envPath = process.env.PUPPETEER_EXECUTABLE_PATH;
@@ -138,7 +138,7 @@ export async function ensureChromiumExecutable(): Promise<string | undefined> {
 	return chromiumExecutablePromise;
 }
 
-let _resolvedChromium: string | null | undefined; // undefined = unchecked; null = not found
+let resolvedChromium: string | null | undefined; // undefined = unchecked; null = not found
 
 function isExecutableFile(p: string): boolean {
 	try {
@@ -209,19 +209,19 @@ function systemChromiumCandidates(): string[] {
 	return candidates;
 }
 
-export function resolveSystemChromium(): string | undefined {
-	if (_resolvedChromium !== undefined) return _resolvedChromium ?? undefined;
+function resolveSystemChromium(): string | undefined {
+	if (resolvedChromium !== undefined) return resolvedChromium ?? undefined;
 	const seen = new Set<string>();
 	for (const candidate of systemChromiumCandidates()) {
 		if (!candidate || seen.has(candidate)) continue;
 		seen.add(candidate);
 		if (isExecutableFile(candidate)) {
-			_resolvedChromium = candidate;
+			resolvedChromium = candidate;
 			logger.debug("Using system Chrome/Chromium", { path: candidate });
 			return candidate;
 		}
 	}
-	_resolvedChromium = null;
+	resolvedChromium = null;
 	return undefined;
 }
 

packages/coding-agent/src/tools/browser/registry.ts

@@ -26,10 +26,6 @@ export interface BrowserHandle {
 
 const browsers = new Map<string, BrowserHandle>();
 
-export function listBrowsers(): BrowserHandle[] {
-	return [...browsers.values()];
-}
-
 function browserKey(kind: BrowserKind): string {
 	switch (kind.kind) {
 		case "headless":
@@ -166,7 +162,7 @@ export async function releaseBrowser(handle: BrowserHandle, opts: { kill: boolea
 	}
 }
 
-export async function disposeBrowserHandle(handle: BrowserHandle, opts: { kill: boolean }): Promise<void> {
+async function disposeBrowserHandle(handle: BrowserHandle, opts: { kill: boolean }): Promise<void> {
 	if (handle.kind.kind === "headless") {
 		if (handle.browser.connected) {
 			try {

packages/coding-agent/src/tools/browser/tab-supervisor.ts

@@ -89,10 +89,6 @@ export function getTab(name: string): TabSession | undefined {
 	return tabs.get(name);
 }
 
-export function listTabs(): TabSession[] {
-	return [...tabs.values()];
-}
-
 export async function acquireTab(
 	name: string,
 	browser: BrowserHandle,

packages/coding-agent/src/tools/find.ts

@@ -12,15 +12,7 @@ import { InternalUrlRouter } from "../internal-urls";
 import type { Theme } from "../modes/theme/theme";
 import findDescription from "../prompts/tools/find.md" with { type: "text" };
 import { type TruncationResult, truncateHead } from "../session/streaming-output";
-import {
-	Ellipsis,
-	Hasher,
-	type RenderCache,
-	renderFileList,
-	renderStatusLine,
-	renderTreeList,
-	truncateToWidth,
-} from "../tui";
+import { Ellipsis, renderFileList, renderStatusLine, renderTreeList, truncateToWidth } from "../tui";
 import type { ToolSession } from ".";
 import { applyListLimit } from "./list-limit";
 import { formatFullOutputReference, type OutputMeta } from "./output-meta";
@@ -33,7 +25,13 @@ import {
 	resolveExplicitFindPatterns,
 	resolveToCwd,
 } from "./path-utils";
-import { formatCount, formatEmptyMessage, formatErrorMessage, PREVIEW_LIMITS } from "./render-utils";
+import {
+	createCachedComponent,
+	formatCount,
+	formatEmptyMessage,
+	formatErrorMessage,
+	PREVIEW_LIMITS,
+} from "./render-utils";
 import { ToolAbortError, ToolError, throwIfAborted } from "./tool-errors";
 import { toolResult } from "./tool-result";
 
@@ -401,30 +399,22 @@ export const findToolRenderer = {
 				},
 				uiTheme,
 			);
-			let cached: RenderCache | undefined;
-			return {
-				render(width: number): string[] {
-					const { expanded } = options;
-					const key = new Hasher().bool(expanded).u32(width).digest();
-					if (cached?.key === key) return cached.lines;
+			return createCachedComponent(
+				() => options.expanded,
+				width => {
 					const listLines = renderTreeList(
 						{
 							items: lines,
-							expanded,
+							expanded: options.expanded,
 							maxCollapsed: COLLAPSED_LIST_LIMIT,
 							itemType: "file",
 							renderItem: line => uiTheme.fg("accent", line),
 						},
 						uiTheme,
 					);
-					const result = [header, ...listLines].map(l => truncateToWidth(l, width, Ellipsis.Omit));
-					cached = { key, lines: result };
-					return result;
+					return [header, ...listLines].map(l => truncateToWidth(l, width, Ellipsis.Omit));
 				},
-				invalidate() {
-					cached = undefined;
-				},
-			};
+			);
 		}
 
 		const fileCount = details?.fileCount ?? 0;
@@ -467,28 +457,20 @@ export const findToolRenderer = {
 		}
 		if (missingNote) extraLines.push(missingNote);
 
-		let cached: RenderCache | undefined;
-		return {
-			render(width: number): string[] {
-				const { expanded } = options;
-				const key = new Hasher().bool(expanded).u32(width).digest();
-				if (cached?.key === key) return cached.lines;
+		return createCachedComponent(
+			() => options.expanded,
+			width => {
 				const fileLines = renderFileList(
 					{
 						files: files.map(entry => ({ path: entry, isDirectory: entry.endsWith("/") })),
-						expanded,
+						expanded: options.expanded,
 						maxCollapsed: COLLAPSED_LIST_LIMIT,
 					},
 					uiTheme,
 				);
-				const result = [header, ...fileLines, ...extraLines].map(l => truncateToWidth(l, width, Ellipsis.Omit));
-				cached = { key, lines: result };
-				return result;
+				return [header, ...fileLines, ...extraLines].map(l => truncateToWidth(l, width, Ellipsis.Omit));
 			},
-			invalidate() {
-				cached = undefined;
-			},
-		};
+		);
 	},
 	mergeCallAndResult: true,
 };

packages/coding-agent/src/tools/inspect-image.ts

@@ -1,7 +1,8 @@
 import type { AgentTool, AgentToolContext, AgentToolResult, AgentToolUpdateCallback } from "@oh-my-pi/pi-agent-core";
-import { type Api, type AssistantMessage, completeSimple, type Model } from "@oh-my-pi/pi-ai";
+import { type Api, completeSimple, type Model } from "@oh-my-pi/pi-ai";
 import { prompt } from "@oh-my-pi/pi-utils";
 import { type Static, Type } from "@sinclair/typebox";
+import { extractTextContent } from "../commit/utils";
 import { expandRoleAlias, resolveModelFromString } from "../config/model-resolver";
 import inspectImageDescription from "../prompts/tools/inspect-image.md" with { type: "text" };
 import inspectImageSystemPromptTemplate from "../prompts/tools/inspect-image-system.md" with { type: "text" };
@@ -30,14 +31,6 @@ export interface InspectImageToolDetails {
 	mimeType: string;
 }
 
-function extractResponseText(message: AssistantMessage): string {
-	return message.content
-		.filter(content => content.type === "text")
-		.map(content => content.text)
-		.join("")
-		.trim();
-}
-
 export class InspectImageTool implements AgentTool<typeof inspectImageSchema, InspectImageToolDetails> {
 	readonly name = "inspect_image";
 	readonly label = "InspectImage";
@@ -151,7 +144,7 @@ export class InspectImageTool implements AgentTool<typeof inspectImageSchema, In
 			throw new ToolError("inspect_image request aborted.");
 		}
 
-		const text = extractResponseText(response);
+		const text = extractTextContent(response);
 		if (!text) {
 			throw new ToolError("inspect_image model returned no text output.");
 		}

packages/coding-agent/src/tools/path-utils.ts

@@ -3,6 +3,8 @@ import * as os from "node:os";
 import * as path from "node:path";
 import * as url from "node:url";
 import { isEnoent } from "@oh-my-pi/pi-utils";
+import { InternalUrlRouter } from "../internal-urls";
+import { ToolError } from "./tool-errors";
 
 const UNICODE_SPACES = /[\u00A0\u2000-\u200A\u202F\u205F\u3000]/g;
 const FILE_LINE_RANGE_RE = /^(?:L?\d+(?:[-+]L?\d+)?|raw|conflicts)$/i;
@@ -567,3 +569,124 @@ export function resolveReadPath(filePath: string, cwd: string): string {
 
 	return resolved;
 }
+
+// =============================================================================
+// Tool-scope resolution (search/ast tools)
+// =============================================================================
+
+export interface ToolScopeOptions {
+	rawPaths: string[];
+	cwd: string;
+	/** Verb used in the "Cannot {action} internal URL without a backing file: …" message. */
+	internalUrlAction: string;
+	/** Collect absolute paths flagged immutable by their internal-URL handler. */
+	trackImmutableSources?: boolean;
+	/** Honor `exactFilePaths` from {@link resolveExplicitSearchPaths} (search-only). */
+	surfaceExactFilePaths?: boolean;
+	/** Extra hint appended to "Path not found" when stat fails and the user supplied multiple paths. */
+	multipathStatHint?: string;
+}
+
+export interface ToolScopeResolution {
+	searchPath: string;
+	scopePath: string;
+	globFilter: string | undefined;
+	isDirectory: boolean;
+	multiTargets?: ResolvedSearchTarget[];
+	exactFilePaths?: string[];
+	missingPaths: string[];
+	immutableSourcePaths: Set<string>;
+}
+
+/**
+ * Shared path-input pipeline for `search`, `ast_grep`, and `ast_edit`:
+ *  1. normalize + reject empty paths,
+ *  2. resolve internal URLs through {@link InternalUrlRouter} to backing files,
+ *  3. partition existing vs missing when multiple paths are supplied,
+ *  4. derive a single search base path / glob, or a multi-target list,
+ *  5. stat the resolved base path so callers can branch on directory vs file scope.
+ */
+export async function resolveToolSearchScope(opts: ToolScopeOptions): Promise<ToolScopeResolution> {
+	const { rawPaths: inputs, cwd, internalUrlAction } = opts;
+	const rawPaths = inputs.map(normalizePathLikeInput);
+	if (rawPaths.some(rawPath => rawPath.length === 0)) {
+		throw new ToolError("`paths` must contain non-empty paths or globs");
+	}
+	const internalRouter = InternalUrlRouter.instance();
+	const resolvedPathInputs: string[] = [];
+	const immutableSourcePaths = new Set<string>();
+	for (const rawPath of rawPaths) {
+		if (!internalRouter.canHandle(rawPath)) {
+			resolvedPathInputs.push(rawPath);
+			continue;
+		}
+		if (hasGlobPathChars(rawPath)) {
+			throw new ToolError(`Glob patterns are not supported for internal URLs: ${rawPath}`);
+		}
+		const resource = await internalRouter.resolve(rawPath);
+		if (!resource.sourcePath) {
+			throw new ToolError(`Cannot ${internalUrlAction} internal URL without a backing file: ${rawPath}`);
+		}
+		if (opts.trackImmutableSources && resource.immutable) {
+			immutableSourcePaths.add(path.resolve(resource.sourcePath));
+		}
+		resolvedPathInputs.push(resource.sourcePath);
+	}
+
+	let missingPaths: string[] = [];
+	let effectivePaths = resolvedPathInputs;
+	if (resolvedPathInputs.length > 1) {
+		const partition = await partitionExistingPaths(resolvedPathInputs, cwd, parseSearchPath);
+		if (partition.valid.length === 0) {
+			throw new ToolError(`Path not found: ${partition.missing.join(", ")}`);
+		}
+		effectivePaths = partition.valid;
+		missingPaths = partition.missing;
+	}
+
+	let searchPath: string;
+	let scopePath: string;
+	let globFilter: string | undefined;
+	let multiTargets: ResolvedSearchTarget[] | undefined;
+	let exactFilePaths: string[] | undefined;
+	if (effectivePaths.length === 1) {
+		const parsedPath = parseSearchPath(effectivePaths[0] ?? ".");
+		searchPath = resolveToCwd(parsedPath.basePath, cwd);
+		globFilter = parsedPath.glob;
+		scopePath = formatPathRelativeToCwd(searchPath, cwd);
+	} else {
+		const multiSearchPath = await resolveExplicitSearchPaths(effectivePaths, cwd);
+		if (!multiSearchPath) {
+			throw new ToolError("`paths` must contain at least one path or glob");
+		}
+		searchPath = multiSearchPath.basePath;
+		multiTargets = multiSearchPath.targets;
+		if (opts.surfaceExactFilePaths) {
+			exactFilePaths = multiSearchPath.exactFilePaths;
+			globFilter = exactFilePaths || multiTargets ? undefined : multiSearchPath.glob;
+		} else {
+			globFilter = multiTargets ? undefined : multiSearchPath.glob;
+		}
+		scopePath = multiSearchPath.scopePath;
+	}
+
+	let isDirectory: boolean;
+	try {
+		const stat = await Bun.file(searchPath).stat();
+		isDirectory = stat.isDirectory();
+	} catch {
+		const hint = opts.multipathStatHint && rawPaths.length > 1 ? opts.multipathStatHint : "";
+		throw new ToolError(`Path not found: ${scopePath}${hint}`);
+	}
+
+	return {
+		searchPath,
+		scopePath,
+		globFilter,
+		isDirectory,
+		multiTargets,
+		exactFilePaths,
+		missingPaths,
+		immutableSourcePaths,
+	};
+}

packages/coding-agent/src/tools/read.ts

@@ -1321,8 +1321,6 @@ export class ReadTool implements AgentTool<typeof readSchema, ReadToolDetails> {
 		const imageMetadata = await readImageMetadata(absolutePath);
 		const mimeType = imageMetadata?.mimeType;
 		const ext = path.extname(absolutePath).toLowerCase();
-		const _hasEditTool = this.session.hasEditTool ?? true;
-		const _language = getLanguageFromPath(absolutePath);
 		const shouldConvertWithMarkit = CONVERTIBLE_EXTENSIONS.has(ext);
 		// Read the file based on type
 		let content: Array<TextContent | ImageContent> | undefined;

packages/coding-agent/src/tools/render-utils.ts

@@ -9,10 +9,12 @@ import * as os from "node:os";
 import * as path from "node:path";
 import type { ToolCallContext } from "@oh-my-pi/pi-agent-core";
 import type { Ellipsis } from "@oh-my-pi/pi-natives";
+import type { Component } from "@oh-my-pi/pi-tui";
 import { replaceTabs, truncateToWidth } from "@oh-my-pi/pi-tui";
 import { pluralize } from "@oh-my-pi/pi-utils";
 import { settings } from "../config/settings";
 import type { Theme } from "../modes/theme/theme";
+import { Hasher } from "../tui/utils";
 import { formatDimensionNote, type ResizedImage } from "../utils/image-resize";
 
 export { Ellipsis } from "@oh-my-pi/pi-natives";
@@ -642,6 +644,96 @@ export function formatParseErrors(errors: string[]): string[] {
 	return [header, ...capped.map(err => `- ${err}`)];
 }
 
+// =============================================================================
+// Renderer helpers shared by search / find / ast tools
+// =============================================================================
+
+/**
+ * Group `rawLines` by blank-line separators, mirroring the historical search /
+ * ast-grep / ast-edit renderer behavior: if any blank line is present, splits on
+ * runs of blank lines; otherwise collapses non-empty lines into a single group.
+ */
+export function splitGroupsByBlankLine(rawLines: string[]): string[][] {
+	const hasSeparators = rawLines.some(line => line.trim().length === 0);
+	const groups: string[][] = [];
+	if (hasSeparators) {
+		let current: string[] = [];
+		for (const line of rawLines) {
+			if (line.trim().length === 0) {
+				if (current.length > 0) {
+					groups.push(current);
+					current = [];
+				}
+				continue;
+			}
+			current.push(line);
+		}
+		if (current.length > 0) groups.push(current);
+	} else {
+		const nonEmpty = rawLines.filter(line => line.trim().length > 0);
+		if (nonEmpty.length > 0) {
+			groups.push(nonEmpty);
+		}
+	}
+	return groups;
+}
+
+/**
+ * Standard width+expand keyed render cache used by every search-style tool
+ * renderer. `compute` re-runs only when the cache key changes; the returned
+ * Component is the canonical `{ render, invalidate }` pair.
+ */
+export function createCachedComponent(
+	getExpanded: () => boolean,
+	compute: (width: number, expanded: boolean) => string[],
+): Component {
+	let cached: { key: bigint; lines: string[] } | undefined;
+	return {
+		render(width: number): string[] {
+			const expanded = getExpanded();
+			const key = new Hasher().bool(expanded).u32(width).digest();
+			if (cached?.key === key) return cached.lines;
+			const lines = compute(width, expanded);
+			cached = { key, lines };
+			return lines;
+		},
+		invalidate() {
+			cached = undefined;
+		},
+	};
+}
+
+/**
+ * Append the indented bullet list of parse errors (capped at
+ * {@link PARSE_ERRORS_LIMIT}) to `lines`, with an overflow summary line if the
+ * total exceeds the cap. No-op when `parseErrors` is empty.
+ */
+export function appendParseErrorsBulletList(
+	lines: string[],
+	parseErrors: readonly string[] | undefined,
+	theme: Theme,
+): void {
+	if (!parseErrors || parseErrors.length === 0) return;
+	const capped = parseErrors.slice(0, PARSE_ERRORS_LIMIT);
+	for (const err of capped) {
+		lines.push(theme.fg("warning", `  - ${err}`));
+	}
+	if (parseErrors.length > PARSE_ERRORS_LIMIT) {
+		lines.push(theme.fg("dim", `  … ${parseErrors.length - PARSE_ERRORS_LIMIT} more`));
+	}
+}
+
+/**
+ * Human-readable summary string for the parse-issues count, capped by
+ * {@link PARSE_ERRORS_LIMIT}.
+ */
+export function formatParseErrorsCountLabel(parseErrors: readonly string[]): string {
+	const total = parseErrors.length;
+	return total > PARSE_ERRORS_LIMIT
+		? `${PARSE_ERRORS_LIMIT} / ${total} parse issues`
+		: `${total} parse issue${total !== 1 ? "s" : ""}`;
+}
+
 // =============================================================================
 // LSP Batching
 // =============================================================================

packages/coding-agent/src/tools/search.ts

@@ -8,32 +8,25 @@ import { prompt, untilAborted } from "@oh-my-pi/pi-utils";
 import { type Static, Type } from "@sinclair/typebox";
 import { getFileReadCache } from "../edit/file-read-cache";
 import type { RenderResultOptions } from "../extensibility/custom-tools/types";
-import { InternalUrlRouter } from "../internal-urls";
 import type { Theme } from "../modes/theme/theme";
 import searchDescription from "../prompts/tools/search.md" with { type: "text" };
 import { DEFAULT_MAX_COLUMN, type TruncationResult, truncateHead } from "../session/streaming-output";
-import { Ellipsis, Hasher, type RenderCache, renderStatusLine, renderTreeList, truncateToWidth } from "../tui";
+import { Ellipsis, renderStatusLine, renderTreeList, truncateToWidth } from "../tui";
 import { resolveFileDisplayMode } from "../utils/file-display-mode";
 import type { ToolSession } from ".";
 import { createFileRecorder, formatResultPath } from "./file-recorder";
 import { formatGroupedFiles } from "./grouped-file-output";
 import { formatMatchLine } from "./match-line-format";
 import { formatFullOutputReference, type OutputMeta } from "./output-meta";
+import { resolveToolSearchScope } from "./path-utils";
 import {
-	formatPathRelativeToCwd,
-	hasGlobPathChars,
-	normalizePathLikeInput,
-	parseSearchPath,
-	partitionExistingPaths,
-	resolveExplicitSearchPaths,
-	resolveToCwd,
-} from "./path-utils";
-import {
+	createCachedComponent,
 	formatCodeFrameLine,
 	formatCount,
 	formatEmptyMessage,
 	formatErrorMessage,
 	PREVIEW_LIMITS,
+	splitGroupsByBlankLine,
 } from "./render-utils";
 import { ToolError } from "./tool-errors";
 import { toolResult } from "./tool-result";
@@ -141,78 +134,26 @@ export class SearchTool implements AgentTool<typeof searchSchema, SearchToolDeta
 			const patternHasNewline = normalizedPattern.includes("\n") || normalizedPattern.includes("\\n");
 			const effectiveMultiline = patternHasNewline;
 
-			const formatScopePath = (targetPath: string): string => formatPathRelativeToCwd(targetPath, this.session.cwd);
-			let searchPath: string;
-			let scopePath: string;
-			let exactFilePaths: string[] | undefined;
-			let multiTargets: Array<{ basePath: string; glob?: string }> | undefined;
-			let globFilter: string | undefined;
-			const rawPaths = paths.map(normalizePathLikeInput);
-			if (rawPaths.some(rawPath => rawPath.length === 0)) {
-				throw new ToolError("`paths` must contain non-empty paths or globs");
-			}
-			const internalRouter = InternalUrlRouter.instance();
-			const resolvedPathInputs: string[] = [];
-			// Absolute filesystem paths whose source is immutable (e.g. artifact://,
-			// pi://, skill://). Hashline anchors are suppressed for these on a
-			// per-file basis, leaving editable mixed-in files untouched.
-			const immutableSourcePaths = new Set<string>();
-			for (const rawPath of rawPaths) {
-				if (!internalRouter.canHandle(rawPath)) {
-					resolvedPathInputs.push(rawPath);
-					continue;
-				}
-				if (hasGlobPathChars(rawPath)) {
-					throw new ToolError(`Glob patterns are not supported for internal URLs: ${rawPath}`);
-				}
-				const resource = await internalRouter.resolve(rawPath);
-				if (!resource.sourcePath) {
-					throw new ToolError(`Cannot search internal URL without a backing file: ${rawPath}`);
-				}
-				if (resource.immutable) {
-					immutableSourcePaths.add(path.resolve(resource.sourcePath));
-				}
-				resolvedPathInputs.push(resource.sourcePath);
-			}
+			const scope = await resolveToolSearchScope({
+				rawPaths: paths,
+				cwd: this.session.cwd,
+				internalUrlAction: "search",
+				trackImmutableSources: true,
+				surfaceExactFilePaths: true,
+				multipathStatHint: " (`paths` entries must each exist relative to cwd)",
+			});
+			const {
+				searchPath,
+				scopePath,
+				isDirectory,
+				multiTargets,
+				exactFilePaths,
+				missingPaths,
+				immutableSourcePaths,
+			} = scope;
+			const { globFilter } = scope;
 			const baseDisplayMode = resolveFileDisplayMode(this.session);
 			const immutableDisplayMode = resolveFileDisplayMode(this.session, { immutable: true });
-			// Tolerate missing entries in a multi-path call: skip ones whose base
-			// directory is gone, and only error if every entry is missing. Single
-			// missing path keeps the original ENOENT semantics.
-			let missingPaths: string[] = [];
-			let effectivePaths = resolvedPathInputs;
-			if (resolvedPathInputs.length > 1) {
-				const partition = await partitionExistingPaths(resolvedPathInputs, this.session.cwd, parseSearchPath);
-				if (partition.valid.length === 0) {
-					throw new ToolError(`Path not found: ${partition.missing.join(", ")}`);
-				}
-				effectivePaths = partition.valid;
-				missingPaths = partition.missing;
-			}
-			if (effectivePaths.length === 1) {
-				const parsedPath = parseSearchPath(effectivePaths[0] ?? ".");
-				searchPath = resolveToCwd(parsedPath.basePath, this.session.cwd);
-				globFilter = parsedPath.glob;
-				scopePath = formatScopePath(searchPath);
-			} else {
-				const multiSearchPath = await resolveExplicitSearchPaths(effectivePaths, this.session.cwd, globFilter);
-				if (!multiSearchPath) {
-					throw new ToolError("`paths` must contain at least one path or glob");
-				}
-				searchPath = multiSearchPath.basePath;
-				exactFilePaths = multiSearchPath.exactFilePaths;
-				multiTargets = multiSearchPath.targets;
-				globFilter = exactFilePaths || multiTargets ? undefined : multiSearchPath.glob;
-				scopePath = multiSearchPath.scopePath;
-			}
-			let isDirectory: boolean;
-			try {
-				const stat = await Bun.file(searchPath).stat();
-				isDirectory = stat.isDirectory();
-			} catch {
-				const hint = rawPaths.length > 1 ? " (`paths` entries must each exist relative to cwd)" : "";
-				throw new ToolError(`Path not found: ${scopePath}${hint}`);
-			}
 
 			const effectiveOutputMode = GrepOutputMode.Content;
 			// Multi-scope = more than one file may match. We fetch up to
@@ -531,16 +472,13 @@ export const searchToolRenderer = {
 				{ icon: "success", title: "Search", description, meta: [formatCount("item", lines.length)] },
 				uiTheme,
 			);
-			let cached: RenderCache | undefined;
-			return {
-				render(width: number): string[] {
-					const { expanded } = options;
-					const key = new Hasher().bool(expanded).u32(width).digest();
-					if (cached?.key === key) return cached.lines;
+			return createCachedComponent(
+				() => options.expanded,
+				width => {
 					const listLines = renderTreeList(
 						{
 							items: lines,
-							expanded,
+							expanded: options.expanded,
 							maxCollapsed: COLLAPSED_TEXT_LIMIT,
 							maxCollapsedLines: COLLAPSED_TEXT_LIMIT,
 							itemType: "item",
@@ -548,14 +486,9 @@ export const searchToolRenderer = {
 						},
 						uiTheme,
 					);
-					const result = [header, ...listLines].map(l => truncateToWidth(l, width, Ellipsis.Omit));
-					cached = { key, lines: result };
-					return result;
+					return [header, ...listLines].map(l => truncateToWidth(l, width, Ellipsis.Omit));
 				},
-				invalidate() {
-					cached = undefined;
-				},
-			};
+			);
 		}
 
 		const matchCount = details?.matchCount ?? 0;
@@ -591,28 +524,7 @@ export const searchToolRenderer = {
 		);
 
 		const textContent = result.details?.displayContent ?? result.content?.find(c => c.type === "text")?.text ?? "";
-		const rawLines = textContent.split("\n");
-		const hasSeparators = rawLines.some(line => line.trim().length === 0);
-		const matchGroups: string[][] = [];
-		if (hasSeparators) {
-			let current: string[] = [];
-			for (const line of rawLines) {
-				if (line.trim().length === 0) {
-					if (current.length > 0) {
-						matchGroups.push(current);
-						current = [];
-					}
-					continue;
-				}
-				current.push(line);
-			}
-			if (current.length > 0) matchGroups.push(current);
-		} else {
-			const nonEmpty = rawLines.filter(line => line.trim().length > 0);
-			if (nonEmpty.length > 0) {
-				matchGroups.push(nonEmpty);
-			}
-		}
+		const matchGroups = splitGroupsByBlankLine(textContent.split("\n"));
 
 		const renderedFileLimit = details?.fileLimitReached;
 		const renderedPerFileLimit = details?.perFileLimitReached;
@@ -629,17 +541,14 @@ export const searchToolRenderer = {
 		}
 		if (missingNote) extraLines.push(missingNote);
 
-		let cached: RenderCache | undefined;
-		return {
-			render(width: number): string[] {
-				const { expanded } = options;
-				const key = new Hasher().bool(expanded).u32(width).digest();
-				if (cached?.key === key) return cached.lines;
+		return createCachedComponent(
+			() => options.expanded,
+			width => {
 				const collapsedMatchLineBudget = Math.max(COLLAPSED_TEXT_LIMIT - extraLines.length, 0);
 				const matchLines = renderTreeList(
 					{
 						items: matchGroups,
-						expanded,
+						expanded: options.expanded,
 						maxCollapsed: matchGroups.length,
 						maxCollapsedLines: collapsedMatchLineBudget,
 						itemType: "match",
@@ -652,14 +561,9 @@ export const searchToolRenderer = {
 					},
 					uiTheme,
 				);
-				const result = [header, ...matchLines, ...extraLines].map(l => truncateToWidth(l, width, Ellipsis.Omit));
-				cached = { key, lines: result };
-				return result;
+				return [header, ...matchLines, ...extraLines].map(l => truncateToWidth(l, width, Ellipsis.Omit));
 			},
-			invalidate() {
-				cached = undefined;
-			},
-		};
+		);
 	},
 	mergeCallAndResult: true,
 };

packages/coding-agent/src/utils/file-mentions.ts

@@ -10,6 +10,7 @@ import path from "node:path";
 import type { AgentMessage } from "@oh-my-pi/pi-agent-core";
 import type { ImageContent } from "@oh-my-pi/pi-ai";
 import { glob } from "@oh-my-pi/pi-natives";
+import { fuzzyMatch } from "@oh-my-pi/pi-tui";
 import { formatAge, formatBytes, readImageMetadata } from "@oh-my-pi/pi-utils";
 import { formatHashLines } from "../hashline/hash";
 import type { FileMentionMessage } from "../session/messages";
@@ -20,7 +21,6 @@ import {
 	truncateHeadBytes,
 } from "../session/streaming-output";
 import { resolveReadPath } from "../tools/path-utils";
-import { fuzzyMatch } from "./fuzzy";
 import { formatDimensionNote, resizeImage } from "./image-resize";
 
 /** Regex to match @filepath patterns in text */

packages/coding-agent/src/utils/fuzzy.ts

@@ -1,108 +0,0 @@
-// Fuzzy search. Matches if all query characters appear in order (not necessarily consecutive).
-// Lower score = better match.
-
-export interface FuzzyMatch {
-	matches: boolean;
-	score: number;
-}
-
-export function fuzzyMatch(query: string, text: string): FuzzyMatch {
-	const queryLower = query.toLowerCase();
-	const textLower = text.toLowerCase();
-
-	if (queryLower.length === 0) {
-		return { matches: true, score: 0 };
-	}
-
-	if (queryLower.length > textLower.length) {
-		return { matches: false, score: 0 };
-	}
-
-	let queryIndex = 0;
-	let score = 0;
-	let lastMatchIndex = -1;
-	let consecutiveMatches = 0;
-
-	for (let i = 0; i < textLower.length && queryIndex < queryLower.length; i++) {
-		if (textLower[i] === queryLower[queryIndex]) {
-			const isWordBoundary = i === 0 || /[\s\-_./]/.test(textLower[i - 1]!);
-
-			// Reward consecutive character matches (e.g., typing "foo" matches "foobar" better than "f_o_o")
-			if (lastMatchIndex === i - 1) {
-				consecutiveMatches++;
-				score -= consecutiveMatches * 5;
-			} else {
-				consecutiveMatches = 0;
-				// Penalize gaps between matched characters
-				if (lastMatchIndex >= 0) {
-					score += (i - lastMatchIndex - 1) * 2;
-				}
-			}
-
-			// Reward matches at word boundaries (start of words are more likely intentional targets)
-			if (isWordBoundary) {
-				score -= 10;
-			}
-
-			// Slight penalty for matches later in the string (prefer earlier matches)
-			score += i * 0.1;
-
-			lastMatchIndex = i;
-			queryIndex++;
-		}
-	}
-
-	// Not all query characters were found in order
-	if (queryIndex < queryLower.length) {
-		return { matches: false, score: 0 };
-	}
-
-	return { matches: true, score };
-}
-
-// Filter and sort items by fuzzy match quality (best matches first)
-// Supports space-separated tokens: all tokens must match, sorted by match count then score
-export function fuzzyFilter<T>(items: T[], query: string, getText: (item: T) => string): T[] {
-	if (!query.trim()) {
-		return items;
-	}
-
-	// Split query into tokens
-	const tokens = query
-		.trim()
-		.split(/\s+/)
-		.filter(t => t.length > 0);
-
-	if (tokens.length === 0) {
-		return items;
-	}
-
-	const results: { item: T; totalScore: number }[] = [];
-
-	for (const item of items) {
-		const text = getText(item);
-		let totalScore = 0;
-		let allMatch = true;
-
-		// Check each token against the text - ALL must match
-		for (const token of tokens) {
-			const match = fuzzyMatch(token, text);
-			if (match.matches) {
-				totalScore += match.score;
-			} else {
-				allMatch = false;
-				break;
-			}
-		}
-
-		// Only include if all tokens match
-		if (allMatch) {
-			results.push({ item, totalScore });
-		}
-	}
-
-	// Sort by score (asc, lower is better)
-	results.sort((a, b) => a.totalScore - b.totalScore);
-
-	return results.map(r => r.item);
-}

packages/coding-agent/src/vim/parser.ts

@@ -124,10 +124,6 @@ export function parseKeySequences(sequences: string[]): VimKeyToken[] {
 	return tokens;
 }
 
-export function tokensToReplay(tokens: readonly VimKeyToken[]): string[] {
-	return tokens.map(token => token.value);
-}
-
 export function replayTokens(values: readonly string[]): VimKeyToken[] {
 	return values.map((value, index) => ({
 		value,
@@ -136,16 +132,3 @@ export function replayTokens(values: readonly string[]): VimKeyToken[] {
 		offset: index,
 	}));
 }
-
-export function formatVimError(error: unknown): string {
-	if (!(error instanceof VimError)) {
-		return error instanceof Error ? error.message : String(error);
-	}
-
-	const base = error.message;
-	if (!error.location) {
-		return base;
-	}
-
-	return `${base} (sequence ${error.location.sequenceIndex + 1}, token ${error.location.offset + 1})`;
-}

packages/coding-agent/src/vim/render.ts

@@ -13,7 +13,7 @@ import type {
 
 export const VIM_OPEN_VIEWPORT_LINES = 80;
 export const VIM_DEFAULT_VIEWPORT_LINES = 10;
-export const VIM_TAB_DISPLAY = "→";
+const VIM_TAB_DISPLAY = "→";
 const VIM_INLINE_CURSOR = "▏";
 
 const VIM_VIEWPORT_WIDTH = 140;

packages/coding-agent/src/vim/types.ts

@@ -164,7 +164,7 @@ export function clonePosition(position: Position): Position {
 	return { line: position.line, col: position.col };
 }
 
-export function comparePositions(left: Position, right: Position): number {
+function comparePositions(left: Position, right: Position): number {
 	if (left.line !== right.line) {
 		return left.line - right.line;
 	}

packages/coding-agent/test/acp-agent.test.ts

@@ -12,7 +12,7 @@ import {
 } from "@agentclientprotocol/sdk/dist/schema/zod.gen.js";
 import type { Model } from "@oh-my-pi/pi-ai";
 import { getConfigRootDir, setAgentDir } from "@oh-my-pi/pi-utils";
-import { _resetSettingsForTest, Settings } from "../src/config/settings";
+import { resetSettingsForTest, Settings } from "../src/config/settings";
 import { AcpAgent } from "../src/modes/acp/acp-agent";
 import type { PlanModeState } from "../src/plan-mode/state";
 import type { AgentSession, AgentSessionEvent } from "../src/session/agent-session";
@@ -316,7 +316,7 @@ afterEach(async () => {
 		setAgentDir(fallbackAgentDir);
 		delete process.env.PI_CODING_AGENT_DIR;
 	}
-	_resetSettingsForTest();
+	resetSettingsForTest();
 
 	for (const root of cleanupRoots.splice(0)) {
 		await fs.promises.rm(root, { recursive: true, force: true });

packages/coding-agent/test/agent-session-bash-detach.test.ts

@@ -45,7 +45,7 @@ import { Agent, type AgentMessage, type AgentTool } from "@oh-my-pi/pi-agent-cor
 import { type AssistantMessage, getBundledModel, type ToolCall } from "@oh-my-pi/pi-ai";
 import { AssistantMessageEventStream } from "@oh-my-pi/pi-ai/utils/event-stream";
 import { ModelRegistry } from "@oh-my-pi/pi-coding-agent/config/model-registry";
-import { _resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
+import { resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
 import { AgentSession } from "@oh-my-pi/pi-coding-agent/session/agent-session";
 import { AuthStorage } from "@oh-my-pi/pi-coding-agent/session/auth-storage";
 import { convertToLlm } from "@oh-my-pi/pi-coding-agent/session/messages";
@@ -165,7 +165,7 @@ describe("BashTool through AgentSession runs children in their own session (e2e)
 		tempDir = path.join(os.tmpdir(), `pi-bash-detach-test-${Snowflake.next()}`);
 		fs.mkdirSync(tempDir, { recursive: true });
 
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		// Fresh isolated Settings rooted in tempDir so we don't pick up the
 		// developer's real config (snapshots, shell prefix, etc).
 		await Settings.init({ inMemory: true, cwd: tempDir });
@@ -243,7 +243,7 @@ describe("BashTool through AgentSession runs children in their own session (e2e)
 	});
 
 	afterAll(() => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 	});
 
 	it.skipIf(skip)("spawned child runs as its own session leader, not in the host's session", async () => {

packages/coding-agent/test/agent-session-retry-fallback.test.ts

@@ -36,15 +36,6 @@ function createAssistantMessage(
 	};
 }
 
-async function _waitFor(predicate: () => boolean, timeoutMs = 1000): Promise<void> {
-	const deadline = Date.now() + timeoutMs;
-	while (Date.now() < deadline) {
-		if (predicate()) return;
-		await Bun.sleep(10);
-	}
-	throw new Error("Timed out waiting for condition");
-}
-
 type AutoRetryStartEvent = Extract<AgentSessionEvent, { type: "auto_retry_start" }>;
 type AutoRetryEndEvent = Extract<AgentSessionEvent, { type: "auto_retry_end" }>;
 

packages/coding-agent/test/autocomplete-max-visible.test.ts

@@ -2,7 +2,7 @@ import { afterEach, beforeEach, describe, expect, it, vi } from "bun:test";
 import * as fs from "node:fs";
 import * as os from "node:os";
 import * as path from "node:path";
-import { _resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
+import { resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
 import { SelectorController } from "@oh-my-pi/pi-coding-agent/modes/controllers/selector-controller";
 import { getProjectAgentDir, Snowflake } from "@oh-my-pi/pi-utils";
 import { YAML } from "bun";
@@ -13,7 +13,7 @@ describe("autocompleteMaxVisible setting", () => {
 	let projectDir: string;
 
 	beforeEach(() => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		testDir = path.join(os.tmpdir(), "test-autocomplete-settings", Snowflake.next());
 		agentDir = path.join(testDir, "agent");
 		projectDir = path.join(testDir, "project");
@@ -22,7 +22,7 @@ describe("autocompleteMaxVisible setting", () => {
 	});
 
 	afterEach(() => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		if (fs.existsSync(testDir)) {
 			fs.rmSync(testDir, { recursive: true });
 		}
@@ -34,7 +34,7 @@ describe("autocompleteMaxVisible setting", () => {
 		await settings.flush();
 
 		// Re-init to verify persistence
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		const settings2 = await Settings.init({ cwd: projectDir, agentDir });
 		expect(settings2.get("autocompleteMaxVisible")).toBe(10);
 	});

packages/coding-agent/test/bash-executor.test.ts

@@ -2,7 +2,7 @@ import { afterEach, beforeEach, describe, expect, it, vi } from "bun:test";
 import * as fs from "node:fs";
 import * as os from "node:os";
 import * as path from "node:path";
-import { _resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
+import { resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
 import { executeBash } from "@oh-my-pi/pi-coding-agent/exec/bash-executor";
 import { DEFAULT_MAX_BYTES } from "@oh-my-pi/pi-coding-agent/session/streaming-output";
 import * as shellSnapshot from "@oh-my-pi/pi-coding-agent/utils/shell-snapshot";
@@ -20,12 +20,12 @@ describe("executeBash", () => {
 
 	beforeEach(async () => {
 		tempDir = makeTempDir();
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		await Settings.init({ inMemory: true, cwd: tempDir });
 	});
 
 	afterEach(() => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		vi.restoreAllMocks();
 		if (fs.existsSync(tempDir)) {
 			fs.rmSync(tempDir, { recursive: true });

packages/coding-agent/test/config-cli.test.ts

@@ -4,21 +4,21 @@ import * as os from "node:os";
 import * as path from "node:path";
 import { getConfigRootDir, setAgentDir } from "@oh-my-pi/pi-utils";
 import { runConfigCommand } from "../src/cli/config-cli";
-import { _resetSettingsForTest } from "../src/config/settings";
+import { resetSettingsForTest } from "../src/config/settings";
 
 let testAgentDir = "";
 const originalAgentDir = process.env.PI_CODING_AGENT_DIR;
 const fallbackAgentDir = path.join(getConfigRootDir(), "agent");
 
 beforeEach(async () => {
-	_resetSettingsForTest();
+	resetSettingsForTest();
 	testAgentDir = await fs.mkdtemp(path.join(os.tmpdir(), "omp-config-cli-"));
 	setAgentDir(testAgentDir);
 });
 
 afterEach(async () => {
 	vi.restoreAllMocks();
-	_resetSettingsForTest();
+	resetSettingsForTest();
 	if (originalAgentDir) {
 		setAgentDir(originalAgentDir);
 	} else {

packages/coding-agent/test/config-spacing.test.ts

@@ -2,21 +2,21 @@ import { afterEach, beforeEach, describe, expect, it } from "bun:test";
 import * as fs from "node:fs/promises";
 import * as os from "node:os";
 import * as path from "node:path";
-import { _resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
+import { resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
 import { getDefaultTabWidth, getIndentation, Snowflake, setDefaultTabWidth } from "@oh-my-pi/pi-utils";
 
 describe("indentation resolver", () => {
 	let tempDir = "";
 
 	beforeEach(async () => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		setDefaultTabWidth(3);
 		tempDir = path.join(os.tmpdir(), "pi-spacing", Snowflake.next());
 		await fs.mkdir(tempDir, { recursive: true });
 	});
 
 	afterEach(async () => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		setDefaultTabWidth(3);
 		await fs.rm(tempDir, { recursive: true, force: true });
 	});

packages/coding-agent/test/core/hashline.test.ts

@@ -2,7 +2,7 @@ import { beforeAll, describe, expect, it } from "bun:test";
 import * as fs from "node:fs/promises";
 import * as os from "node:os";
 import * as path from "node:path";
-import { _resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
+import { resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
 import {
 	applyHashlineEdits,
 	buildCompactHashlineDiffPreview,
@@ -27,7 +27,7 @@ import type { ToolSession } from "@oh-my-pi/pi-coding-agent/tools";
 import { Value } from "@sinclair/typebox/value";
 
 beforeAll(async () => {
-	_resetSettingsForTest();
+	resetSettingsForTest();
 	await Settings.init({ inMemory: true, cwd: process.cwd() });
 });
 

packages/coding-agent/test/discovery/disabled-extensions.test.ts

@@ -3,7 +3,7 @@ import * as fs from "node:fs/promises";
 import * as os from "node:os";
 import * as path from "node:path";
 import { type ContextFile, contextFileCapability } from "@oh-my-pi/pi-coding-agent/capability/context-file";
-import { _resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
+import { resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
 import { initializeWithSettings, loadCapability } from "@oh-my-pi/pi-coding-agent/discovery";
 
 describe("disabledExtensions runtime filtering", () => {
@@ -12,7 +12,7 @@ describe("disabledExtensions runtime filtering", () => {
 	let originalHome: string | undefined;
 
 	beforeEach(async () => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		originalHome = process.env.HOME;
 		tempHomeDir = await fs.mkdtemp(path.join(os.tmpdir(), "omp-disabled-ext-home-"));
 		process.env.HOME = tempHomeDir;
@@ -32,7 +32,7 @@ describe("disabledExtensions runtime filtering", () => {
 	});
 
 	afterEach(async () => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		vi.restoreAllMocks();
 		if (originalHome === undefined) {
 			delete process.env.HOME;

packages/coding-agent/test/edit-auto-generated-regressions.test.ts

@@ -19,7 +19,7 @@ import { Agent, type AgentTool } from "@oh-my-pi/pi-agent-core";
 import { type AssistantMessage, getBundledModel, type StopReason, type ToolCall } from "@oh-my-pi/pi-ai";
 import { AssistantMessageEventStream } from "@oh-my-pi/pi-ai/utils/event-stream";
 import { ModelRegistry } from "@oh-my-pi/pi-coding-agent/config/model-registry";
-import { _resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
+import { resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
 import { EditTool } from "@oh-my-pi/pi-coding-agent/edit";
 import { AgentSession } from "@oh-my-pi/pi-coding-agent/session/agent-session";
 import { AuthStorage } from "@oh-my-pi/pi-coding-agent/session/auth-storage";
@@ -251,7 +251,7 @@ it("multi-entry edit on an auto-generated file surfaces isError + error text ins
 	// The auto-generated guard reads from the *global* settings singleton, so we
 	// must initialize it (the per-tool `Settings.isolated(...)` we pass into the
 	// EditTool isn't what the guard sees).
-	_resetSettingsForTest();
+	resetSettingsForTest();
 	await Settings.init({ inMemory: true, cwd: tempDir, overrides: { "edit.blockAutoGenerated": true } });
 
 	try {

packages/coding-agent/test/edit-per-file-diff-content.test.ts

@@ -2,7 +2,7 @@ import { afterEach, beforeEach, describe, expect, test } from "bun:test";
 import * as fs from "node:fs/promises";
 import * as os from "node:os";
 import * as path from "node:path";
-import { _resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
+import { resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
 import {
 	DEFAULT_FUZZY_THRESHOLD,
 	EditTool,
@@ -40,13 +40,13 @@ const noopBeginDeferred = (_p: string) => ({
 let tempDir: string;
 
 beforeEach(async () => {
-	_resetSettingsForTest();
+	resetSettingsForTest();
 	tempDir = await fs.mkdtemp(path.join(os.tmpdir(), "omp-edit-diff-"));
 	await Settings.init({ inMemory: true, cwd: tempDir });
 });
 
 afterEach(async () => {
-	_resetSettingsForTest();
+	resetSettingsForTest();
 	await fs.rm(tempDir, { recursive: true, force: true });
 });
 

packages/coding-agent/test/extensions-runner.test.ts

@@ -8,9 +8,9 @@ import * as path from "node:path";
 import { ModelRegistry } from "@oh-my-pi/pi-coding-agent/config/model-registry";
 import { discoverAndLoadExtensions } from "@oh-my-pi/pi-coding-agent/extensibility/extensions/loader";
 import {
-	__test_setExtensionHandlerTimeoutMs,
 	EXTENSION_HANDLER_TIMEOUT_MS,
 	ExtensionRunner,
+	testSetExtensionHandlerTimeoutMs,
 } from "@oh-my-pi/pi-coding-agent/extensibility/extensions/runner";
 import { AuthStorage } from "@oh-my-pi/pi-coding-agent/session/auth-storage";
 import { SessionManager } from "@oh-my-pi/pi-coding-agent/session/session-manager";
@@ -34,7 +34,7 @@ describe("ExtensionRunner", () => {
 	});
 
 	afterEach(() => {
-		__test_setExtensionHandlerTimeoutMs(EXTENSION_HANDLER_TIMEOUT_MS);
+		testSetExtensionHandlerTimeoutMs(EXTENSION_HANDLER_TIMEOUT_MS);
 		authStorage.close();
 		tempDir.removeSync();
 	});
@@ -644,7 +644,7 @@ describe("ExtensionRunner", () => {
 			runner.onError(err => {
 				errors.push(err);
 			});
-			__test_setExtensionHandlerTimeoutMs(50);
+			testSetExtensionHandlerTimeoutMs(50);
 
 			const startedAt = performance.now();
 			await runner.emit({ type: "session_start" });

packages/coding-agent/test/fuzzy.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, test } from "bun:test";
-import { fuzzyFilter, fuzzyMatch } from "@oh-my-pi/pi-coding-agent/utils/fuzzy";
+import { fuzzyFilter, fuzzyMatch } from "@oh-my-pi/pi-tui";
 
 describe("fuzzyMatch", () => {
 	test("empty query matches everything with score 0", () => {

packages/coding-agent/test/hindsight-backend.test.ts

@@ -9,7 +9,7 @@
 
 import { afterEach, beforeEach, describe, expect, it, vi } from "bun:test";
 import type { AgentMessage } from "@oh-my-pi/pi-agent-core";
-import { _resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
+import { resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
 import { hindsightBackend, reloadMentalModelsForSession } from "@oh-my-pi/pi-coding-agent/hindsight/backend";
 import { HindsightApi } from "@oh-my-pi/pi-coding-agent/hindsight/client";
 import type { HindsightSessionState } from "@oh-my-pi/pi-coding-agent/hindsight/state";
@@ -76,7 +76,7 @@ function makeFakeSession(deps: FakeSessionDeps) {
 
 describe("hindsightBackend.start", () => {
 	beforeEach(() => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 	});
 
 	afterEach(() => {
@@ -235,7 +235,7 @@ describe("hindsightBackend.start", () => {
 
 describe("hindsightBackend.preCompactionContext", () => {
 	beforeEach(() => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 	});
 
 	afterEach(() => {
@@ -297,7 +297,7 @@ describe("hindsightBackend.preCompactionContext", () => {
 
 describe("hindsightBackend first-turn injection", () => {
 	beforeEach(() => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 	});
 
 	afterEach(() => {
@@ -480,7 +480,7 @@ describe("hindsightBackend first-turn injection", () => {
 
 describe("hindsightBackend.clear", () => {
 	beforeEach(() => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 	});
 
 	afterEach(() => {

packages/coding-agent/test/hindsight-tools.test.ts

@@ -8,7 +8,7 @@
  */
 
 import { afterEach, beforeEach, describe, expect, it, vi } from "bun:test";
-import { _resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
+import { resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
 import { HindsightApi } from "@oh-my-pi/pi-coding-agent/hindsight/client";
 import type { HindsightConfig } from "@oh-my-pi/pi-coding-agent/hindsight/config";
 import { HindsightSessionState } from "@oh-my-pi/pi-coding-agent/hindsight/state";
@@ -94,7 +94,7 @@ function registerState(client: HindsightApi, settings?: Settings, opts: Register
 
 describe("Hindsight tool factories", () => {
 	beforeEach(() => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		registeredState = undefined;
 	});
 
@@ -122,7 +122,7 @@ describe("Hindsight tool factories", () => {
 
 describe("retain.execute", () => {
 	beforeEach(() => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		registeredState = undefined;
 	});
 
@@ -210,7 +210,7 @@ describe("retain.execute", () => {
 
 describe("recall.execute", () => {
 	beforeEach(() => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		registeredState = undefined;
 	});
 
@@ -278,7 +278,7 @@ describe("recall.execute", () => {
 
 describe("reflect.execute", () => {
 	beforeEach(() => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		registeredState = undefined;
 	});
 

packages/coding-agent/test/interactive-mode-editor-component.test.ts

@@ -1,7 +1,7 @@
 import { afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "bun:test";
 import * as path from "node:path";
 import { Agent } from "@oh-my-pi/pi-agent-core";
-import { _resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
+import { resetSettingsForTest, Settings } from "@oh-my-pi/pi-coding-agent/config/settings";
 import { initTheme } from "@oh-my-pi/pi-coding-agent/modes/theme/theme";
 import { TempDir } from "@oh-my-pi/pi-utils";
 import { ModelRegistry } from "../src/config/model-registry";
@@ -24,7 +24,7 @@ describe("InteractiveMode.setEditorComponent", () => {
 	});
 
 	beforeEach(async () => {
-		_resetSettingsForTest();
+		resetSettingsForTest();
 		tempDir = TempDir.createSync("@pi-editor-component-");
 		await Settings.init({ inMemory: true, cwd: tempDir.path() });
 		authStorage = await AuthStorage.create(path.join(tempDir.path(), "testauth.db"));
@@ -56,7 +56,7 @@ describe("InteractiveMode.setEditorComponent", () => {
 		await session?.dispose();
 		authStorage?.close();
 		tempDir?.removeSync();
-		_resetSettingsForTest();
+		resetSettingsForTest();
 	});
 
 	it("replaces the editor and rebinds interactive handlers", () => {