feat(agent): implemented preview titles and session compaction logic

- Added preview title support and fallback handling across shape previews and status line segments.
- Refined session list sizing and line height budgets in the session selector component.
- Extracted session compaction method helpers and improved speculative compaction logic.
- Prevented armed LLM speculation results from overriding local snapshot compaction execution.

packages/coding-agent/CHANGELOG.md

@@ -21,7 +21,7 @@
 
 - Revamped the todo HUD — overall progress renders along the tree-spine connector with smooth completion transitions.
 - `/handoff` (and automatic handoff compaction) now compacts in place, replacing the session context instead of forking a new session.
-- Replaced `compaction.strategy`/`compaction.remoteEnabled` with the ordered `compaction.methodOrder` fallback list.
+- Compaction method priorities — `compaction.methodOrder` takes an ordered preference list (e.g. `[remote, snap]` uses remote compaction where the provider supports it, such as OpenAI, and snap everywhere else), replacing `compaction.strategy`/`compaction.remoteEnabled`.
 - Unified inline overlays and selectors (model picker, settings, `/cleanse`) into one titled rounded-box panel style.
 - Risk badges and warnings on `/settings` rows, starting with External Thinking.
 

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

@@ -3,8 +3,9 @@
  * scene. Chrome is rendered through the same {@link ComposerStyle} objects the
  * real editor uses, and status rows come from the live
  * {@link ComposerPreviewStatusSource} (the session's StatusLineComponent) —
- * nothing about the preview is a re-implementation, so it cannot drift from
+ * nothing about the preview is a re-implementation. Prompt text is a preview
- * the real composer. Only the prompt text is a stand-in.
+ * stand-in, and the `session_name` segment falls back to a stand-in title
+ * (passed via `previewTitle`) when the session is unnamed.
  */
 import {
 	type Component,
@@ -25,11 +26,11 @@ import { theme } from "../theme/theme";
  */
 export interface ComposerPreviewStatusSource {
 	/** Powerline bar with the context gauge (box top border content). */
-	getTopBorder(width: number): { content: string; width: number };
+	getTopBorder(width: number, previewTitle?: string): { content: string; width: number };
 	/** Plain right-group chip (claude top rule content). */
-	getStandaloneTopBorder(width: number): { content: string; width: number };
+	getStandaloneTopBorder(width: number, previewTitle?: string): { content: string; width: number };
 	/** Plain standalone bottom bar carrying the given segment groups. */
-	renderBottomBar(width: number, groups: "left" | "full"): string;
+	renderBottomBar(width: number, groups: "left" | "full", previewTitle?: string): string;
 }
 
 export interface ComposerShapePreviewOptions {
@@ -37,13 +38,15 @@ export interface ComposerShapePreviewOptions {
 	/** Live status renderer; omitted (tests), the chrome renders without status rows. */
 	status?: ComposerPreviewStatusSource;
 }
+/** Stand-in session title shown while the previewed session is unnamed. */
+const PREVIEW_TITLE = "omp";
 
 export function renderComposerShapePreview(
 	shape: ComposerShape,
 	width: number,
 	status?: ComposerPreviewStatusSource,
 ): readonly string[] {
-	const previewWidth = Math.max(24, Math.min(width, 76));
+	const previewWidth = Math.max(24, Math.min(width, 96));
 	const style = getComposerStyle(shape);
 	const paddingX = style.defaultPaddingX(undefined);
 	const chromeWidth = style.sideChromeWidth(paddingX);
@@ -51,10 +54,9 @@ export function renderComposerShapePreview(
 	let topBorder: EditorTopBorder | undefined;
 	if (status) {
 		if (style.statusAttachment === "top-border") {
-			const availableWidth = Math.max(1, previewWidth - chromeWidth * 2);
+			topBorder = status.getTopBorder(Math.max(1, previewWidth - chromeWidth * 2), PREVIEW_TITLE);
-			topBorder = status.getTopBorder(availableWidth);
 		} else if (style.statusAttachment === "top-rule-chip") {
-			topBorder = status.getStandaloneTopBorder(previewWidth);
+			topBorder = status.getStandaloneTopBorder(previewWidth, PREVIEW_TITLE);
 		}
 	}
 
@@ -94,7 +96,7 @@ export function renderComposerShapePreview(
 	if (bottom !== undefined) lines.push(bottom);
 
 	if (style.bottomBar !== "none" && status) {
-		const bar = status.renderBottomBar(previewWidth, style.bottomBar);
+		const bar = status.renderBottomBar(previewWidth, style.bottomBar, PREVIEW_TITLE);
 		if (bar) {
 			if (style.bottomBarGap) lines.push("");
 			lines.push(bar);

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

@@ -329,23 +329,26 @@ class SessionList implements Component {
 	}
 
 	/**
-	 * Number of sessions to show at once, sized so the whole picker fits the
+	 * Session-row line budget for one render, sized so the whole picker fits
-	 * current viewport instead of pushing its header/search off the top.
+	 * the current viewport instead of pushing its header/search off the top.
 	 *
-	 * Budget = rows − chrome − reserve, divided by the worst-case per-session
+	 * Chrome (7) is the panel's top border, one spacer, the list's search line
-	 * height. Chrome (11) is the rounded panel and surrounding spacers/footer
+	 * and its blank, and the pinned footer minus its leading blank (hint,
-	 * (6) plus the list's search line, blank, scroll indicator, blank, and hint
+	 * blank, bottom border) — the last visible session's separator blank is
-	 * (5). A titled session is the tallest item at 4 lines (title + preview +
+	 * never rendered, so the footer's own blank stands in for it. The reserve
-	 * metadata + blank); budgeting for that guarantees no overflow even when
+	 * covers below-editor hook widgets / cursor. The floor of 8 always admits
-	 * every visible entry has a title. The reserve covers below-editor hook
+	 * two titled sessions (the tallest item at 4 lines: title + preview +
-	 * widgets / cursor.
+	 * metadata + separator).
 	 */
-	#visibleCount(): number {
+	#lineBudget(): number {
-		const CHROME = 11;
+		const CHROME = 7;
-		const PER_SESSION = 4;
 		const RESERVE = 1;
-		const budget = this.#getTerminalRows() - CHROME - RESERVE;
+		return Math.max(8, this.#getTerminalRows() - CHROME - RESERVE);
-		return Math.max(2, Math.floor(budget / PER_SESSION));
+	}
+
+	/** PageUp/PageDown jump, approximated from the worst-case session height. */
+	#pageSize(): number {
+		return Math.max(2, Math.floor(this.#lineBudget() / 4));
 	}
 
 	/** Replace the visible dataset, e.g. when toggling folder/all-projects scope. */
@@ -556,21 +559,36 @@ class SessionList implements Component {
 			return date.toLocaleDateString();
 		};
 
-		// Calculate visible range with scrolling. The window is sized to the
+		// Pack the window around the selection by actual line height (3 lines
-		// current viewport so the picker never overflows past the top.
+		// per session, 4 when a title adds a preview line) until the viewport
-		const maxVisible = this.#visibleCount();
+		// budget is spent, so short sessions never strand blank rows a
-		const startIndex = Math.max(
+		// worst-case count-based window would leave (then padded by
-			0,
+		// fill-height).
-			Math.min(this.#selectedIndex - Math.floor(maxVisible / 2), this.#filteredSessions.length - maxVisible),
+		const filtered = this.#filteredSessions;
-		);
+		const itemHeight = (session: SessionInfo): number => (session.title ? 4 : 3);
-		const endIndex = Math.min(startIndex + maxVisible, this.#filteredSessions.length);
+		const budget = this.#lineBudget();
+		let startIndex = this.#selectedIndex;
+		let endIndex = this.#selectedIndex + 1;
+		let used = itemHeight(filtered[this.#selectedIndex]!);
+		// Alternate growth below/above the selection to keep it roughly centered.
+		for (let preferDown = true; ; preferDown = !preferDown) {
+			const canDown = endIndex < filtered.length && used + itemHeight(filtered[endIndex]!) <= budget;
+			const canUp = startIndex > 0 && used + itemHeight(filtered[startIndex - 1]!) <= budget;
+			if (!canDown && !canUp) break;
+			if (canDown && (preferDown || !canUp)) {
+				used += itemHeight(filtered[endIndex]!);
+				endIndex++;
+			} else {
+				startIndex--;
+				used += itemHeight(filtered[startIndex]!);
+			}
+		}
 
-		// Render visible sessions (3 lines, or 4 when a title adds a preview line).
 		// Each session block is built into sessionLines, then wrapped by ScrollView
 		// so the right-edge scrollbar is proportional at the physical-line level.
 		const sessionLines: string[] = [];
 		const sessionRowIndex: number[] = [];
-		const overflow = this.#filteredSessions.length > maxVisible;
+		const overflow = startIndex > 0 || endIndex < filtered.length;
 		const rowWidth = Math.max(0, width - (overflow ? 1 : 0));
 		for (let i = startIndex; i < endIndex; i++) {
 			const blockStart = sessionLines.length;
@@ -622,20 +640,31 @@ class SessionList implements Component {
 			const metadataLine = truncateToWidth(metadata, rowWidth);
 
 			sessionLines.push(metadataLine);
-			sessionLines.push(""); // Blank line between sessions
+			// Blank separator between sessions; the last block ends flush against
+			// the footer, whose leading blank provides the same gap.
+			if (i < endIndex - 1) sessionLines.push("");
 			for (let k = blockStart; k < sessionLines.length; k++) sessionRowIndex[k] = i;
 		}
 
-		// Wrap the rendered window in a ScrollView for a proportional right-edge bar.
+		// Wrap the rendered window in a ScrollView for a proportional right-edge
-		const visibleCount = endIndex - startIndex;
+		// bar, with exact physical-line totals from the per-session heights.
-		const linesPerItem = visibleCount > 0 ? sessionLines.length / visibleCount : 1;
+		let totalRows = 0;
+		let offsetRows = 0;
+		for (let i = 0; i < filtered.length; i++) {
+			if (i === startIndex) offsetRows = totalRows;
+			totalRows += itemHeight(filtered[i]!);
+		}
+		// The last session's separator blank is never rendered (see the block
+		// loop above), so exclude it or a fully visible list would still show a
+		// scrollbar.
+		totalRows -= 1;
 		const sv = new ScrollView(sessionLines, {
 			height: sessionLines.length,
 			scrollbar: "auto",
-			totalRows: Math.round(this.#filteredSessions.length * linesPerItem),
+			totalRows,
 			theme: { track: t => theme.fg("muted", t), thumb: t => theme.fg("accent", t) },
 		});
-		sv.setScrollOffset(Math.round(startIndex * linesPerItem));
+		sv.setScrollOffset(offsetRows);
 		const sessionRegionStart = lines.length;
 		const svLines = sv.render(width);
 		for (let k = 0; k < svLines.length; k++) this.#hitRows[sessionRegionStart + k] = sessionRowIndex[k];
@@ -677,13 +706,13 @@ class SessionList implements Component {
 		// Page up - jump up by maxVisible items
 		if (matchesKey(keyData, "pageUp")) {
 			this.#selectionMoved = true;
-			this.#selectedIndex = Math.max(0, this.#selectedIndex - this.#visibleCount());
+			this.#selectedIndex = Math.max(0, this.#selectedIndex - this.#pageSize());
 			return;
 		}
 		// Page down - jump down by maxVisible items
 		if (matchesKey(keyData, "pageDown")) {
 			this.#selectionMoved = true;
-			this.#selectedIndex = Math.min(this.#filteredSessions.length - 1, this.#selectedIndex + this.#visibleCount());
+			this.#selectedIndex = Math.min(this.#filteredSessions.length - 1, this.#selectedIndex + this.#pageSize());
 			return;
 		}
 		// Enter
@@ -799,11 +828,9 @@ export class SessionSelectorComponent extends OverlayPanel {
 		this.#title = options.title ?? "Resume Session";
 		this.#scopeLabel = options.scopeLabel;
 		this.title = this.#headerLabel();
-		// Keep the existing breathing room; OverlayPanel supplies the two outer
+		// One spacer of breathing room; OverlayPanel supplies the two outer
 		// border rows and the horizontal inset.
 		this.addChild(new Spacer(1));
-		this.addChild(new Spacer(1));
-		this.addChild(new Spacer(1));
 		this.addChild(this.#messageContainer);
 		// Create session list in folder scope; the empty-state hint invites the
 		// user to Tab into all-projects rather than silently surfacing other

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

@@ -35,7 +35,6 @@ import {
 	validateProviderMaxInFlightRequests,
 } from "../../config/settings";
 import type {
-	ComposerShape,
 	ContextLineMode,
 	SettingTab,
 	StatusLinePreset,

packages/coding-agent/src/modes/components/status-line/component.ts

@@ -9,7 +9,7 @@ import {
 	truncateToWidth,
 	visibleWidth,
 } from "@oh-my-pi/pi-tui";
-import { formatNumber, getProjectDir } from "@oh-my-pi/pi-utils";
+import { adjustHsv, formatNumber, getProjectDir } from "@oh-my-pi/pi-utils";
 import { settings } from "../../../config/settings";
 import type { AgentSession } from "../../../session/agent-session";
 import type { OAuthAccountIdentity } from "../../../session/auth-storage";
@@ -1601,6 +1601,7 @@ export class StatusLineComponent implements Component {
 		includePath: boolean,
 		includeGit: boolean,
 		includePr: boolean,
+		previewTitle?: string,
 	): SegmentContext {
 		const state = this.session.state;
 
@@ -1668,6 +1669,7 @@ export class StatusLineComponent implements Component {
 			session: this.session,
 			focusedAgentId: this.#focusedAgentId,
 			sessionAccent: this.#resolveSettings().sessionAccent !== false,
+			previewTitle,
 			activeRepo: activeRepoCache.activeRepo,
 			width,
 			options: segmentOptions ?? {},
@@ -1756,8 +1758,15 @@ export class StatusLineComponent implements Component {
 	 * - `plain-left`: left segments only (claude composer; the right group
 	 *   lives in the editor's top rule).
 	 * - `plain-right`: right segments only (claude composer's top rule).
+	 *
+	 * `previewTitle` is a stand-in session title for composer previews; the
+	 * `session_name` segment renders it when the session is unnamed.
 	 */
-	#buildStatusLine(width: number, layout: "box" | "plain-full" | "plain-left" | "plain-right" = "box"): string {
+	#buildStatusLine(
+		width: number,
+		layout: "box" | "plain-full" | "plain-left" | "plain-right" = "box",
+		previewTitle?: string,
+	): string {
 		const effectiveSettings = this.#resolveSettings();
 		const plain = layout !== "box";
 		const includePath =
@@ -1774,6 +1783,7 @@ export class StatusLineComponent implements Component {
 			includePath,
 			includeGit,
 			includePr,
+			previewTitle,
 		);
 		const separatorDef = plain
 			? { left: "·", right: "·" }
@@ -1866,6 +1876,22 @@ export class StatusLineComponent implements Component {
 		const totalWidth = () => leftWidth + rightWidth + (left.length > 0 && right.length > 0 ? 1 : 0);
 
 		if (topFillWidth > 0) {
+			// Truncate the session-name segment before dropping right segments —
+			// the title is the only elastic one on the right, and dropping it
+			// wholesale left narrow bars (and the ≤76-col composer previews)
+			// without any title.
+			const nameSegIdx = rightSegIds.indexOf("session_name");
+			if (nameSegIdx >= 0 && totalWidth() > topFillWidth) {
+				// Badge/job parts were unshifted ahead of the tracked segment ids.
+				const nameIdx = nameSegIdx + (right.length - rightSegIds.length);
+				const currentNameVW = visibleWidth(right[nameIdx]);
+				const minNameVW = 8;
+				const shrinkBy = Math.min(Math.max(0, currentNameVW - minNameVW), totalWidth() - topFillWidth);
+				if (shrinkBy > 0) {
+					right[nameIdx] = truncateToWidth(right[nameIdx], currentNameVW - shrinkBy);
+					rightWidth = groupWidth(right, rightCapWidth, rightSepWidth);
+				}
+			}
 			while (totalWidth() > topFillWidth && right.length > 0) {
 				right.pop();
 				rightWidth = groupWidth(right, rightCapWidth, rightSepWidth);
@@ -2021,7 +2047,9 @@ export class StatusLineComponent implements Component {
 				const cellFor = (percent: number) =>
 					Math.min(scaleWidth - 1, Math.max(0, Math.round((percent / 100) * scaleWidth)));
 				thresholdIdx = cellFor(boundaries.thresholdPercent);
-				speculationIdx = cellFor(boundaries.speculationPercent);
+				// null = no background speculation will run (async disabled or the
+				// first available method is local/instant) — no tick to show.
+				if (boundaries.speculationPercent !== null) speculationIdx = cellFor(boundaries.speculationPercent);
 				if (speculationIdx === thresholdIdx) speculationIdx = -1; // threshold wins the cell
 			}
 		}
@@ -2051,7 +2079,9 @@ export class StatusLineComponent implements Component {
 		const speculationGlyph = theme.symbol("context.speculation");
 		const thresholdGlyph = theme.symbol("context.compaction");
 		const speculationColor = theme.getFgAnsi("muted");
-		const thresholdColor = theme.getFgAnsi("warning");
+		const rawAccentHex = accentHex ?? theme.getColorHex("borderAccent");
+		const dimmedAccentHex = adjustHsv(rawAccentHex, { s: 0.7, v: 0.75 });
+		const thresholdColor = getSessionAccentAnsi(dimmedAccentHex) ?? usedColor;
 
 		let out = "\x1b[49m";
 		let activeColor = "";
@@ -2085,15 +2115,18 @@ export class StatusLineComponent implements Component {
 		// Collab-guest replicas and test mocks have no session-scoped settings;
 		// the global store carries the same compaction knobs.
 		const source = typeof this.session.settings?.getGroup === "function" ? this.session.settings : settings;
+		// The active model gates which compaction method a real pass would run
+		// (and therefore whether a speculation tick is meaningful).
+		const model = this.session.state?.model ?? this.session.model;
 		try {
-			return computeCompactionBoundaries(source, contextWindow);
+			return computeCompactionBoundaries(source, contextWindow, model);
 		} catch {
 			return null;
 		}
 	}
 
-	getTopBorder(width: number): { content: string; width: number; revision: number } {
+	getTopBorder(width: number, previewTitle?: string): { content: string; width: number; revision: number } {
-		let content = this.#buildStatusLine(width);
+		let content = this.#buildStatusLine(width, "box", previewTitle);
 		if (this.#focusedAgentId && content) {
 			// Dim the whole bar while focus-proxied. Group/cap terminators emit full
 			// `\x1b[0m` resets that would cancel faint mid-bar, so re-open it after each.
@@ -2125,8 +2158,8 @@ export class StatusLineComponent implements Component {
 	}
 
 	/** Plain right-group content for the claude composer's top rule. */
-	getStandaloneTopBorder(width: number): { content: string; width: number; revision: number } {
+	getStandaloneTopBorder(width: number, previewTitle?: string): { content: string; width: number; revision: number } {
-		let content = this.#buildStatusLine(width, "plain-right");
+		let content = this.#buildStatusLine(width, "plain-right", previewTitle);
 		if (this.#focusedAgentId && content) {
 			content = `\x1b[2m${content.replaceAll("\x1b[0m", "\x1b[0m\x1b[2m")}\x1b[22m`;
 		}
@@ -2143,8 +2176,8 @@ export class StatusLineComponent implements Component {
 	 * loop and by composer previews (which inject a candidate layout instead of
 	 * the active one).
 	 */
-	renderBottomBar(width: number, groups: "left" | "full"): string {
+	renderBottomBar(width: number, groups: "left" | "full", previewTitle?: string): string {
-		let content = this.#buildStatusLine(width, groups === "left" ? "plain-left" : "plain-full");
+		let content = this.#buildStatusLine(width, groups === "left" ? "plain-left" : "plain-full", previewTitle);
 		if (this.#focusedAgentId && content) {
 			content = `\x1b[2m${content.replaceAll("\x1b[0m", "\x1b[0m\x1b[2m")}\x1b[22m`;
 		}

packages/coding-agent/src/modes/components/status-line/segments.ts

@@ -631,7 +631,7 @@ const sessionNameSegment: StatusLineSegment = {
 	id: "session_name",
 	render(ctx) {
 		const sessionManager = ctx.session.sessionManager;
-		const name = sessionManager?.getSessionName();
+		const name = sessionManager?.getSessionName() || ctx.previewTitle;
 		if (!name) return { content: "", visible: false };
 
 		const accentEnabled = ctx.sessionAccent !== false;

packages/coding-agent/src/modes/components/status-line/types.ts

@@ -63,6 +63,8 @@ export interface SegmentContext {
 	focusedAgentId?: string | undefined;
 	/** Effective `statusLine.sessionAccent`; `false` disables hash-derived accent colors, while `true` or omission enables them. */
 	sessionAccent?: boolean;
+	/** Stand-in session title for previews; `session_name` renders it when the session is unnamed. */
+	previewTitle?: string;
 	activeRepo: ActiveRepoContext | null;
 	width: number;
 	options: StatusLineSegmentOptions;

packages/coding-agent/src/modes/controllers/extension-ui-controller.ts

@@ -22,8 +22,8 @@ import type {
 	TerminalInputHandler,
 } from "../../extensibility/extensions";
 import { getSessionSlashCommands } from "../../extensibility/extensions/get-commands-handler";
-import { installExtensionComposerShape } from "../../modes/components/composer-shape-registry";
 import { AskDialogComponent, boundPromptTitle } from "../../modes/components/ask-dialog";
+import { installExtensionComposerShape } from "../../modes/components/composer-shape-registry";
 import { HookEditorComponent } from "../../modes/components/hook-editor";
 import { HookInputComponent } from "../../modes/components/hook-input";
 import { HookSelectorComponent, type HookSelectorSlider } from "../../modes/components/hook-selector";

packages/coding-agent/src/modes/setup-wizard/scenes/composer.ts

@@ -1,7 +1,7 @@
 import { routeSelectListMouse, type SelectItem, SelectList, type SgrMouseEvent } from "@oh-my-pi/pi-tui";
 import type { ComposerShape } from "../../../config/settings-schema";
-import { getComposerShapeOptions } from "../../components/composer-shape-registry";
 import { renderComposerShapePreview } from "../../components/composer-shape-preview";
+import { getComposerShapeOptions } from "../../components/composer-shape-registry";
 import { getSelectListTheme, theme } from "../../theme/theme";
 import type { SetupScene, SetupSceneController, SetupSceneHost } from "./types";
 

packages/coding-agent/src/modes/utils/context-usage.ts

@@ -6,6 +6,7 @@ import { toolWireSchema } from "@oh-my-pi/pi-ai/utils/schema";
 import { formatNumber } from "@oh-my-pi/pi-utils";
 import type { Skill } from "../../extensibility/skills";
 import type { AgentSession } from "../../session/agent-session";
+import { resolveSpeculationMethod } from "../../session/compaction-methods";
 import { estimateInlineSavings, type SnapcompactSavingsEstimate } from "../../session/snapcompact-inline";
 import { resolveSpeculationLeadTokens } from "../../session/speculation-lead";
 import type { Tool } from "../../tools";
@@ -46,28 +47,36 @@ export interface ContextBreakdown {
 export interface CompactionBoundaries {
 	/** Where auto-compaction fires. */
 	thresholdPercent: number;
-	/** Where the background speculative summarizer starts (threshold − lead). */
+	/**
-	speculationPercent: number;
+	 * Where the background speculative summarizer starts (threshold − lead), or
+	 * `null` when no speculation will run (async compaction disabled, or the
+	 * first available method is local — snapcompact/shake — and thus instant).
+	 */
+	speculationPercent: number | null;
 }
 
 /**
  * Boundary positions for the status line's annotated context gauge. `null`
  * when compaction is disabled/off or the window is unknown — the gauge then
- * renders without markers.
+ * renders without markers. `model` resolves which configured method a real
+ * pass would run; without it, model-gated methods count as unavailable.
  */
 export function computeCompactionBoundaries(
 	settings: AgentSession["settings"],
 	contextWindow: number,
+	model?: Model | null,
 ): CompactionBoundaries | null {
 	if (!(contextWindow > 0)) return null;
-	const compactionSettings = settings.getGroup("compaction") as CompactionSettings;
+	const configured = settings.getGroup("compaction");
-	if (!compactionSettings.enabled || compactionSettings.strategy === "off") return null;
+	const compactionSettings = configured as CompactionSettings;
+	if (!configured.enabled || compactionSettings.strategy === "off") return null;
 	const thresholdTokens = resolveThresholdTokens(contextWindow, compactionSettings);
 	if (!(thresholdTokens > 0) || thresholdTokens > contextWindow) return null;
+	const speculates = configured.asyncEnabled !== false && resolveSpeculationMethod(model, configured) !== undefined;
 	const leadTokens = resolveSpeculationLeadTokens(thresholdTokens);
 	return {
 		thresholdPercent: (thresholdTokens / contextWindow) * 100,
-		speculationPercent: (Math.max(0, thresholdTokens - leadTokens) / contextWindow) * 100,
+		speculationPercent: speculates ? (Math.max(0, thresholdTokens - leadTokens) / contextWindow) * 100 : null,
 	};
 }
 

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

@@ -1,5 +1,12 @@
 /** Ordered automatic context-maintenance methods and their settings metadata. */
 
+import {
+	type CompactionSettings as EngineCompactionSettings,
+	shouldUseProviderNativeCompaction,
+} from "@oh-my-pi/pi-agent-core/compaction";
+import type { Model } from "@oh-my-pi/pi-ai";
+import type { CompactionSettings } from "../config/settings-schema";
+
 /** Choices presented by the ordered compaction-method setting. */
 export const COMPACTION_METHOD_CHOICES = [
 	{
@@ -67,3 +74,58 @@ export function resolveCompactionMethodOrder(value: unknown): CompactionMethod[]
 	}
 	return methods;
 }
+
+const STRATEGY_BY_COMPACTION_METHOD: Record<CompactionMethod, "context-full" | "handoff" | "shake" | "snapcompact"> = {
+	remote: "context-full",
+	snapcompact: "snapcompact",
+	handoff: "handoff",
+	soft: "context-full",
+	shake: "shake",
+};
+
+/**
+ * Convert the selected preference into the engine's compact operation flags.
+ * The engine intentionally remains usable by SDK consumers that do not expose
+ * the coding agent's preference list.
+ */
+export function resolveMethodSettings(
+	settings: CompactionSettings,
+	method: CompactionMethod,
+): EngineCompactionSettings {
+	return {
+		...settings,
+		strategy: STRATEGY_BY_COMPACTION_METHOD[method],
+		remoteEnabled: method === "remote",
+	};
+}
+
+/** Whether server compaction has either a configured endpoint or an active native route. */
+export function canUseRemoteCompaction(model: Model | null | undefined, settings: EngineCompactionSettings): boolean {
+	return (
+		(typeof settings.remoteEndpoint === "string" && settings.remoteEndpoint.length > 0) ||
+		(model !== null && model !== undefined && shouldUseProviderNativeCompaction(model, settings))
+	);
+}
+
+/**
+ * First configured method a threshold pass would run, or undefined when it is
+ * local (snapcompact/shake) — local methods are effectively instant, so there
+ * is nothing to speculate. Shared by the maintenance loop's speculation gate
+ * and the status line's annotated context gauge (speculation marker).
+ */
+export function resolveSpeculationMethod(
+	model: Model | null | undefined,
+	settings: CompactionSettings,
+): "remote" | "handoff" | "soft" | undefined {
+	for (const candidate of resolveCompactionMethodOrder(settings.methodOrder)) {
+		const available =
+			candidate === "remote"
+				? canUseRemoteCompaction(model, resolveMethodSettings(settings, candidate))
+				: candidate === "snapcompact"
+					? model?.input?.includes("image") === true
+					: true;
+		if (!available) continue;
+		return candidate === "remote" || candidate === "handoff" || candidate === "soft" ? candidate : undefined;
+	}
+	return undefined;
+}

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

@@ -70,8 +70,11 @@ import type { ContextUsageBreakdown, HandoffResult, SessionHandoffOptions } from
 import { findCompactMode } from "./compact-modes";
 import {
 	type CompactionMethod,
+	canUseRemoteCompaction,
 	DEFAULT_COMPACTION_METHOD_ORDER,
 	resolveCompactionMethodOrder,
+	resolveMethodSettings,
+	resolveSpeculationMethod,
 } from "./compaction-methods";
 import { convertToLlm, stripImagesFromMessage } from "./messages";
 import { isTerminalTextAssistantAnswer } from "./queued-messages";
@@ -113,38 +116,6 @@ const COMPACTION_CHECK_BLOCK_AUTOMATIC_CONTINUATION: CompactionCheckResult = {
 	automaticContinuationBlocked: true,
 };
 
-const STRATEGY_BY_COMPACTION_METHOD: Record<CompactionMethod, "context-full" | "handoff" | "shake" | "snapcompact"> = {
-	remote: "context-full",
-	snapcompact: "snapcompact",
-	handoff: "handoff",
-	soft: "context-full",
-	shake: "shake",
-};
-
-/**
- * Convert the selected preference into the engine's compact operation flags.
- * The engine intentionally remains usable by SDK consumers that do not expose
- * the coding agent's preference list.
- */
-function resolveMethodSettings(
-	settings: ConfiguredCompactionSettings,
-	method: CompactionMethod,
-): EngineCompactionSettings {
-	return {
-		...settings,
-		strategy: STRATEGY_BY_COMPACTION_METHOD[method],
-		remoteEnabled: method === "remote",
-	};
-}
-
-/** Whether server compaction has either a configured endpoint or an active native route. */
-function canUseRemoteCompaction(model: Model | null | undefined, settings: EngineCompactionSettings): boolean {
-	return (
-		(typeof settings.remoteEndpoint === "string" && settings.remoteEndpoint.length > 0) ||
-		(model !== null && model !== undefined && shouldUseProviderNativeCompaction(model, settings))
-	);
-}
-
 /** Whether a configured preference list contains at least one automatic method. */
 function hasConfiguredCompactionMethod(settings: ConfiguredCompactionSettings): boolean {
 	return resolveCompactionMethodOrder(settings.methodOrder).length > 0;
@@ -1169,7 +1140,7 @@ export class SessionMaintenance {
 		}
 		const model = this.#model;
 		if (!model) return;
-		const method = this.#resolveSpeculationMethod(model, settings);
+		const method = resolveSpeculationMethod(model, settings);
 		if (!method) return;
 		const controller = new AbortController();
 		const run: SpeculationRun = { controller, promise: Promise.resolve(), contextTokensAtStart: contextTokens };
@@ -1183,24 +1154,6 @@ export class SessionMaintenance {
 		});
 	}
 
-	/** First configured method a threshold pass would run, or undefined when it is local (nothing to speculate). */
-	#resolveSpeculationMethod(
-		model: Model,
-		settings: ConfiguredCompactionSettings,
-	): "remote" | "handoff" | "soft" | undefined {
-		for (const candidate of resolveCompactionMethodOrder(settings.methodOrder)) {
-			const available =
-				candidate === "remote"
-					? canUseRemoteCompaction(model, resolveMethodSettings(settings, candidate))
-					: candidate === "snapcompact"
-						? model.input.includes("image")
-						: true;
-			if (!available) continue;
-			return candidate === "remote" || candidate === "handoff" || candidate === "soft" ? candidate : undefined;
-		}
-		return undefined;
-	}
-
 	/** Produce and arm one speculative compaction result off a branch snapshot. */
 	async #runSpeculation(
 		run: SpeculationRun,
@@ -2644,7 +2597,10 @@ export class SessionMaintenance {
 		// in the background. Claiming consumes the slot either way: an in-flight
 		// run is aborted (this real pass supersedes it) and an armed result is
 		// returned only when still valid for the current branch/model/settings.
-		const armedSpec = this.#claimArmedSpeculation();
+		// Snapcompact is local and instant, so an armed LLM summary (possible
+		// only when settings/model changed since arming) never overrides it.
+		const claimedSpec = this.#claimArmedSpeculation();
+		const armedSpec = method === "snapcompact" ? undefined : claimedSpec;
 
 		const effectiveSettings = resolveMethodSettings(compactionSettings, method);
 		const fallbackFromShake = options.fallbackFromShake === true;