feat(agent): rendered conversation logs with preferred tool syntax

- Updated compaction, branch summarization, and session dump formatting to pass preferred model tool syntax into conversation serialization.
- Enhanced shared serializers to render assistant tool calls and tool results through grammar envelopes when syntax is available, with the prior compact format as fallback.
- Aligned prompt, preview, and test fixtures to the new transcript tags: `[Think]`, `[Tool Call]`, and `[Tool Result]`.

packages/coding-agent/src/modes/components/snapcompact-shape-preview-doc.md

@@ -1,8 +1,8 @@
 [User]: Fix the settings overlay crash. Wheeling past the last row throws.
 
-[Assistant tool calls]: read(path="src/select-list.ts:140-180")
+[Tool Call]: read(path="src/select-list.ts:140-180")
 
-[Tool result]: 162: const index = Math.floor(line / rowHeight); index is never checked against bounds.
+[Tool Result]: 162: const index = Math.floor(line / rowHeight); index is never checked against bounds.
 
 [Assistant]: Found it. The hit test indexes past the filtered list; clamping to the last row fixes the crash.
 

packages/coding-agent/src/modes/components/snapcompact-shape-preview.ts

@@ -38,10 +38,10 @@ const ZOOM_SCALE = 4;
 const MAX_IMAGE_COLS = 28;
 const MAX_IMAGE_ROWS = 14;
 
-/** Sample transcript with `[Tool result]:` bodies wrapped in dim-ink toggles. */
+/** Sample transcript with `[Tool Result]:` bodies wrapped in dim-ink toggles. */
 const PREVIEW_TEXT = sampleDoc
 	.trim()
-	.replace(/\[Tool result\]: ([^[]*)/g, (_match, body: string) => `[Tool result]: ${DIM_ON}${body}${DIM_OFF}`);
+	.replace(/\[Tool Result\]: ([^[]*)/g, (_match, body: string) => `[Tool Result]: ${DIM_ON}${body}${DIM_OFF}`);
 
 type PreviewEntry =
 	| { state: "rendering" }

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

@@ -4,7 +4,8 @@
 import type { AgentMessage, ThinkingLevel } from "@oh-my-pi/pi-agent-core";
 import { INTENT_FIELD } from "@oh-my-pi/pi-agent-core";
 import type { AssistantMessage, Model, ToolExample, TSchema } from "@oh-my-pi/pi-ai";
-import { renderToolInventory } from "@oh-my-pi/pi-ai/grammar";
+import { getInbandGrammar, renderToolInventory } from "@oh-my-pi/pi-ai/grammar";
+import { preferredToolSyntax } from "@oh-my-pi/pi-catalog/identity";
 import { getVisibleThinkingText } from "../utils/thinking-display";
 import {
 	type BashExecutionMessage,
@@ -34,22 +35,12 @@ export interface FormatSessionDumpTextOptions {
 	tools?: readonly SessionDumpToolInfo[];
 }
 
-/** Serialize an object as XML parameter elements, one per key. */
-function formatArgsAsXml(args: Record<string, unknown>, indent = "\t"): string {
-	const parts: string[] = [];
-	for (const [key, value] of Object.entries(args)) {
-		if (key === INTENT_FIELD) continue;
-		const text = typeof value === "string" ? value : JSON.stringify(value);
-		parts.push(`${indent}<parameter name="${key}">${text}</parameter>`);
-	}
-	return parts.join("\n");
-}
-
 /**
  * Format messages and session metadata as markdown/plain text (same as AgentSession.formatSessionAsText / /dump).
  */
 export function formatSessionDumpText(options: FormatSessionDumpTextOptions): string {
 	const lines: string[] = [];
+	const grammar = getInbandGrammar(preferredToolSyntax(options.model?.id ?? ""));
 
 	const systemPrompt = options.systemPrompt?.filter(prompt => prompt.length > 0) ?? [];
 	if (systemPrompt.length > 0) {
@@ -112,11 +103,9 @@ export function formatSessionDumpText(options: FormatSessionDumpTextOptions): st
 					lines.push(thinking);
 					lines.push("</thinking>\n");
 				} else if (c.type === "toolCall") {
-					lines.push(`<invoke name="${c.name}">`);
-					if (c.arguments && typeof c.arguments === "object") {
-						lines.push(formatArgsAsXml(c.arguments as Record<string, unknown>));
-					}
-					lines.push("<" + "/invoke>\n");
+					const args = { ...(c.arguments as Record<string, unknown>) };
+					delete args[INTENT_FIELD];
+					lines.push(grammar.renderToolCall({ ...c, arguments: args }));
 				}
 			}
 			lines.push("");

packages/coding-agent/test/compaction-serialization.test.ts

@@ -18,7 +18,7 @@ describe("serializeConversation", () => {
 
 		const result = serializeConversation(messages);
 
-		expect(result).toContain("[Tool result]:");
+		expect(result).toContain("[Tool Result]:");
 		expect(result).toContain("[... 3000 more characters truncated]");
 		expect(result).toContain("x".repeat(2000));
 		expect(result).not.toContain("x".repeat(3000));
@@ -39,7 +39,7 @@ describe("serializeConversation", () => {
 
 		const result = serializeConversation(messages);
 
-		expect(result).toBe(`[Tool result]: ${shortContent}`);
+		expect(result).toBe(`[Tool Result]: ${shortContent}`);
 		expect(result).not.toContain("truncated");
 	});