co-mono/packages/coding-agent/examples/extensions/with-deps/index.ts

/**
 * Example extension with its own npm dependencies.
 * Tests that jiti resolves modules from the extension's own node_modules.
 *
 * Requires: npm install in this directory
 */

import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
import { Type } from "@sinclair/typebox";
import ms from "ms";

export default function (pi: ExtensionAPI) {
	// Use the ms package to prove it loaded
	const uptime = ms(process.uptime() * 1000, { long: true });
	console.log(`[with-deps] Extension loaded. Process uptime: ${uptime}`);

	// Register a tool that uses ms
	pi.registerTool({
		name: "parse_duration",
		label: "Parse Duration",
		description: "Parse a human-readable duration string (e.g., '2 days', '1h', '5m') to milliseconds",
		parameters: Type.Object({
			duration: Type.String({ description: "Duration string like '2 days', '1h', '5m'" }),
		}),
		execute: async (_toolCallId, params) => {
			const result = ms(params.duration as ms.StringValue);
			if (result === undefined) {
				return {
					content: [{ type: "text", text: `Invalid duration: "${params.duration}"` }],
					isError: true,
					details: {},
				};
			}
			return {
				content: [{ type: "text", text: `${params.duration} = ${result} milliseconds` }],
				details: {},
			};
		},
	});
}