Phase 9: persist state after tracked skill changes — SPEC §6.1.

Call saveState via appendEntry after slash, skill-block, and read-path tracking so session state survives resume.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/index.ts

@@ -3,32 +3,41 @@ import { isToolCallEventType, type ExtensionAPI, type ExtensionContext, type Ski
 import { detectSlashSkill, matchReadPathToSkillWhenEnabled, parseSkillBlocksFromText, userMessageText } from "./detect.js";
 import { readSettings } from "./settings.js";
 import { findRegisteredSkillByName, resolveRegisteredSkills } from "./skills-registry.js";
-import { createInitialState, trackSkill, type ExtensionState } from "./state.js";
-
-function trackReadSkillPath(
-	path: string,
-	ctx: ExtensionContext,
-	state: ExtensionState,
-	registeredSkills: Skill[],
-): void {
-	const settings = readSettings(ctx);
-	const skills = resolveRegisteredSkills(ctx.cwd, registeredSkills);
-	const matched = matchReadPathToSkillWhenEnabled(path, skills, settings.trackReadPaths);
-	if (!matched) {
-		return;
-	}
-	trackSkill(state, {
-		name: matched.name,
-		filePath: matched.filePath,
-		baseDir: matched.baseDir,
-		source: "read",
-	});
-}
+import {
+	createInitialState,
+	saveState,
+	trackSkill,
+	type TrackSkillInput,
+} from "./state.js";
 
 export default function skillReinject(pi: ExtensionAPI): void {
 	const state = createInitialState();
 	let registeredSkills: Skill[] = [];
 
+	function persistState(): void {
+		saveState(pi, state);
+	}
+
+	function trackSkillAndPersist(input: TrackSkillInput): void {
+		trackSkill(state, input);
+		persistState();
+	}
+
+	function trackReadSkillPath(path: string, ctx: ExtensionContext): void {
+		const settings = readSettings(ctx);
+		const skills = resolveRegisteredSkills(ctx.cwd, registeredSkills);
+		const matched = matchReadPathToSkillWhenEnabled(path, skills, settings.trackReadPaths);
+		if (!matched) {
+			return;
+		}
+		trackSkillAndPersist({
+			name: matched.name,
+			filePath: matched.filePath,
+			baseDir: matched.baseDir,
+			source: "read",
+		});
+	}
+
 	pi.on("before_agent_start", async (event) => {
 		registeredSkills = event.systemPromptOptions.skills ?? registeredSkills;
 	});
@@ -43,7 +52,7 @@ export default function skillReinject(pi: ExtensionAPI): void {
 			const skills = resolveRegisteredSkills(ctx.cwd, registeredSkills);
 			const skill = findRegisteredSkillByName(skills, skillName);
 			if (skill) {
-				trackSkill(state, {
+				trackSkillAndPersist({
 					name: skill.name,
 					filePath: skill.filePath,
 					baseDir: skill.baseDir,
@@ -60,9 +69,13 @@ export default function skillReinject(pi: ExtensionAPI): void {
 			return;
 		}
 
-		const text = userMessageText(event.message.content);
+		const blocks = parseSkillBlocksFromText(userMessageText(event.message.content));
+		if (blocks.length === 0) {
+			return;
+		}
+
 		const skills = resolveRegisteredSkills(ctx.cwd, registeredSkills);
-		for (const block of parseSkillBlocksFromText(text)) {
+		for (const block of blocks) {
 			const registered = findRegisteredSkillByName(skills, block.name);
 			trackSkill(state, {
 				name: block.name,
@@ -71,12 +84,13 @@ export default function skillReinject(pi: ExtensionAPI): void {
 				source: "skill-block",
 			});
 		}
+		persistState();
 	});
 
 	pi.on("tool_call", async (event, ctx) => {
 		if (!isToolCallEventType("read", event)) {
 			return;
 		}
-		trackReadSkillPath(event.input.path, ctx, state, registeredSkills);
+		trackReadSkillPath(event.input.path, ctx);
 	});
 }