feat(coding-agent): add resources_discover hook

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

@@ -35,6 +35,8 @@ import type {
 	MessageRenderer,
 	RegisteredCommand,
 	RegisteredTool,
+	ResourcesDiscoverEvent,
+	ResourcesDiscoverResult,
 	SessionBeforeCompactResult,
 	SessionBeforeTreeResult,
 	ToolCallEvent,
@@ -629,6 +631,54 @@ export class ExtensionRunner {
 		return undefined;
 	}
 
+	async emitResourcesDiscover(
+		cwd: string,
+		reason: ResourcesDiscoverEvent["reason"],
+	): Promise<{
+		skillPaths: Array<{ path: string; extensionPath: string }>;
+		promptPaths: Array<{ path: string; extensionPath: string }>;
+		themePaths: Array<{ path: string; extensionPath: string }>;
+	}> {
+		const ctx = this.createContext();
+		const skillPaths: Array<{ path: string; extensionPath: string }> = [];
+		const promptPaths: Array<{ path: string; extensionPath: string }> = [];
+		const themePaths: Array<{ path: string; extensionPath: string }> = [];
+
+		for (const ext of this.extensions) {
+			const handlers = ext.handlers.get("resources_discover");
+			if (!handlers || handlers.length === 0) continue;
+
+			for (const handler of handlers) {
+				try {
+					const event: ResourcesDiscoverEvent = { type: "resources_discover", cwd, reason };
+					const handlerResult = await handler(event, ctx);
+					const result = handlerResult as ResourcesDiscoverResult | undefined;
+
+					if (result?.skillPaths?.length) {
+						skillPaths.push(...result.skillPaths.map((path) => ({ path, extensionPath: ext.path })));
+					}
+					if (result?.promptPaths?.length) {
+						promptPaths.push(...result.promptPaths.map((path) => ({ path, extensionPath: ext.path })));
+					}
+					if (result?.themePaths?.length) {
+						themePaths.push(...result.themePaths.map((path) => ({ path, extensionPath: ext.path })));
+					}
+				} catch (err) {
+					const message = err instanceof Error ? err.message : String(err);
+					const stack = err instanceof Error ? err.stack : undefined;
+					this.emitError({
+						extensionPath: ext.path,
+						event: "resources_discover",
+						error: message,
+						stack,
+					});
+				}
+			}
+		}
+
+		return { skillPaths, promptPaths, themePaths };
+	}
+
 	/** Emit input event. Transforms chain, "handled" short-circuits. */
 	async emitInput(text: string, images: ImageContent[] | undefined, source: InputSource): Promise<InputEventResult> {
 		const ctx = this.createContext();