my-pi/extensions/subagents.ts

import { fileURLToPath } from "node:url";
import { createPiSubagentsExtension } from "../pi-subagents/src/index.ts";
import {
	readSubagentPreamble,
	resolveSubagentAgentsDir,
} from "./system-prompt-config.ts";

// Bundle authority: Agent frontmatter may disable optional extensions, but it
// cannot remove the exact wrapper that deploys my-pi's permission baseline and
// binds the maintained permission-system source.
const BUNDLED_PERMISSION_EXTENSION = fileURLToPath(
	new URL("./permission-system.ts", import.meta.url),
);

// Subagents get their own prompt profile: config/prompt/subagent/preamble.md
// replaces the parent-prompt embedding upstream performs, and
// config/prompt/subagent/agents/*.md are loaded as built-in agent types.
// ask_user_question is main-session-only — a child has no user to ask.
const ASK_USER_EXTENSION = fileURLToPath(
	new URL("../pi-ask-user/index.ts", import.meta.url),
);

export default createPiSubagentsExtension({
	mandatoryExtensionPaths: [BUNDLED_PERMISSION_EXTENSION],
	basePrompt: readSubagentPreamble,
	bundledAgentsDir: resolveSubagentAgentsDir(),
	excludedExtensionPaths: [ASK_USER_EXTENSION],
});