Phase 9: track skill blocks on message_end for user messages — SPEC §6.2 #2.

Scan finalized user message text for expanded skill XML blocks and upsert tracked skills using registered metadata when available.

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

src/detect.ts

@@ -21,6 +21,27 @@ function normalizePathForCompare(filePath: string): string {
 	return normalize(filePath);
 }
 
+/** Text from user message content (string or text blocks). */
+export function userMessageText(content: unknown): string {
+	if (typeof content === "string") {
+		return content;
+	}
+	if (!Array.isArray(content)) {
+		return "";
+	}
+	const parts: string[] = [];
+	for (const part of content) {
+		if (!part || typeof part !== "object") {
+			continue;
+		}
+		const block = part as { type?: string; text?: string };
+		if (block.type === "text" && typeof block.text === "string") {
+			parts.push(block.text);
+		}
+	}
+	return parts.join("\n");
+}
+
 /** Returns skill name when text is a slash skill command, else null. */
 export function detectSlashSkill(text: string): string | null {
 	const match = SLASH_SKILL_RE.exec(text);

src/index.ts

@@ -1,5 +1,6 @@
+import { dirname } from "node:path";
 import type { ExtensionAPI, Skill } from "@earendil-works/pi-coding-agent";
-import { detectSlashSkill } from "./detect.js";
+import { detectSlashSkill, parseSkillBlocksFromText, userMessageText } from "./detect.js";
 import { findRegisteredSkillByName, resolveRegisteredSkills } from "./skills-registry.js";
 import { createInitialState, trackSkill } from "./state.js";
 
@@ -32,4 +33,22 @@ export default function skillReinject(pi: ExtensionAPI): void {
 
 		return { action: "continue" };
 	});
+
+	pi.on("message_end", async (event, ctx) => {
+		if (event.message.role !== "user") {
+			return;
+		}
+
+		const text = userMessageText(event.message.content);
+		const skills = resolveRegisteredSkills(ctx.cwd, registeredSkills);
+		for (const block of parseSkillBlocksFromText(text)) {
+			const registered = findRegisteredSkillByName(skills, block.name);
+			trackSkill(state, {
+				name: block.name,
+				filePath: registered?.filePath ?? block.location,
+				baseDir: registered?.baseDir ?? dirname(block.location),
+				source: "skill-block",
+			});
+		}
+	});
 }