@anthropic-ai/mcpb 2.1.2: checkManifest, bundleExtension, extractExtension

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:npm/%40anthropic-ai/mcpb@2.1.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40anthropic-ai/mcpb@2.1.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:028f1f4091bd0053c2fea9ed8bf51cd0eb03544155fde1cbb93cd6a61dfc1508","contract":["assert MANIFEST_SCHEMAS contains schemas for supported manifest versions","assert validateManifest validates valid manifest structure and rejects invalid manifests","assert packExtension packages an extension directory into an mcpb archive","assert unpackExtension extracts an mcpb archive into target directory"],"goal":"verify pkg:npm/%40anthropic-ai/mcpb@2.1.2","kind":"HOW","packages":["pkg:npm/%40anthropic-ai/mcpb@2.1.2"],"schemaVersion":1,"symbols":["checkManifest","bundleExtension","extractExtension","validateManifest","packExtension","unpackExtension","MANIFEST_SCHEMAS"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40anthropic-ai/mcpb@2.1.2"],"schemaVersion":1,"subject":"pkg:npm/%40anthropic-ai/mcpb@2.1.2","symbols":["checkManifest","bundleExtension","extractExtension","validateManifest","packExtension","unpackExtension","MANIFEST_SCHEMAS"],"verifierAdapter":"node-typescript@1"}

import {
  validateManifest,
  packExtension,
  unpackExtension,
  MANIFEST_SCHEMAS,
  VERSIONED_MANIFEST_SCHEMAS
} from '@anthropic-ai/mcpb';

/**
 * Validates whether an MCP extension manifest conforms to the schema specification.
 *
 * @param {string} manifestPath - File path to manifest.json or directory containing manifest.json
 * @returns {boolean} True if the manifest is valid, false otherwise
 */
export function checkManifest(manifestPath) {
  return validateManifest(manifestPath);
}

/**
 * Packages an extension directory into a .mcpb bundle archive.
 *
 * @param {string} extensionPath - Path to the directory containing extension files and manifest
 * @param {string} outputPath - Target path for the output .mcpb archive file
 * @param {boolean} [silent=true] - Whether to suppress console output
 * @returns {Promise<boolean>} True if packing succeeded
 */
export async function bundleExtension(extensionPath, outputPath, silent = true) {
  return packExtension({ extensionPath, outputPath, silent });
}

/**
 * Extracts an .mcpb bundle archive into a target directory.
 *
 * @param {string} mcpbPath - Path to the .mcpb archive file
 * @param {string} outputDir - Directory to unpack files into
 * @param {boolean} [silent=true] - Whether to suppress console output
 * @returns {Promise<boolean>} True if unpacking succeeded
 */
export async function extractExtension(mcpbPath, outputDir, silent = true) {
  return unpackExtension({ mcpbPath, outputDir, silent });
}

export {
  validateManifest,
  packExtension,
  unpackExtension,
  MANIFEST_SCHEMAS,
  VERSIONED_MANIFEST_SCHEMAS
};

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}

{
  "name": "sample-mcpb",
  "version": "1.0.0",
  "description": "Clean-room sample verifying pkg:npm/@anthropic-ai/mcpb@2.1.2 functionality",
  "type": "module",
  "main": "index.js",
  "license": "MIT-0",
  "dependencies": {
    "@anthropic-ai/mcpb": "2.1.2"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40anthropic-ai/mcpb@2.1.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40anthropic-ai/mcpb@2.1.2"
  ]
}

import assert from 'node:assert';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import {
  checkManifest,
  bundleExtension,
  extractExtension,
  validateManifest,
  packExtension,
  unpackExtension,
  MANIFEST_SCHEMAS,
  VERSIONED_MANIFEST_SCHEMAS
} from '../index.js';

// 1. MANIFEST_SCHEMAS and VERSIONED_MANIFEST_SCHEMAS provide versioned schemas
assert(typeof MANIFEST_SCHEMAS === 'object' && MANIFEST_SCHEMAS !== null, 'MANIFEST_SCHEMAS must be an object');
assert(MANIFEST_SCHEMAS['0.1'] !== undefined, 'MANIFEST_SCHEMAS must define schema for 0.1');
assert(MANIFEST_SCHEMAS['0.2'] !== undefined, 'MANIFEST_SCHEMAS must define schema for 0.2');
assert(MANIFEST_SCHEMAS['0.3'] !== undefined, 'MANIFEST_SCHEMAS must define schema for 0.3');
assert(MANIFEST_SCHEMAS['0.4'] !== undefined, 'MANIFEST_SCHEMAS must define schema for 0.4');
assert(typeof VERSIONED_MANIFEST_SCHEMAS === 'object' && VERSIONED_MANIFEST_SCHEMAS !== null, 'VERSIONED_MANIFEST_SCHEMAS must be an object');
assert(VERSIONED_MANIFEST_SCHEMAS['0.2'] !== undefined, 'VERSIONED_MANIFEST_SCHEMAS must define schema for 0.2');

// 2. validateManifest verifies valid manifest structure and rejects invalid manifests
const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'contract-mcpb-'));

try {
  const manifestDir = path.join(tempDir, 'manifest-test');
  fs.mkdirSync(manifestDir);

  const validManifest = {
    manifest_version: '0.2',
    name: 'sample-server',
    version: '1.0.0',
    description: 'Sample MCP server for testing',
    author: {
      name: 'Sample Author'
    },
    server: {
      type: 'node',
      entry_point: 'index.js',
      mcp_config: {
        command: 'node',
        args: ['index.js']
      }
    }
  };

  const validManifestPath = path.join(manifestDir, 'manifest.json');
  fs.writeFileSync(validManifestPath, JSON.stringify(validManifest, null, 2));

  const validResult = checkManifest(validManifestPath);
  assert.strictEqual(validResult, true, 'checkManifest should return true for a valid manifest file');

  const validDirResult = validateManifest(manifestDir);
  assert.strictEqual(validDirResult, true, 'validateManifest should accept directory containing manifest.json');

  const invalidManifestPath = path.join(manifestDir, 'invalid-manifest.json');
  fs.writeFileSync(invalidManifestPath, JSON.stringify({ name: 'incomplete' }, null, 2));

  const invalidResult = checkManifest(invalidManifestPath);
  assert.strictEqual(invalidResult, false, 'checkManifest should return false for an invalid manifest');

  // 3. packExtension packages an extension directory into a .mcpb bundle
  const extensionDir = path.join(tempDir, 'extension-source');
  fs.mkdirSync(extensionDir);

  const extManifest = {
    manifest_version: '0.2',
    name: 'sample-pack-extension',
    version: '1.0.0',
    description: 'Sample pack extension',
    author: {
      name: 'Sample Author'
    },
    server: {
      type: 'node',
      entry_point: 'server.js',
      mcp_config: {
        command: 'node',
        args: ['server.js']
      }
    }
  };

  fs.writeFileSync(path.join(extensionDir, 'manifest.json'), JSON.stringify(extManifest, null, 2));
  fs.writeFileSync(path.join(extensionDir, 'server.js'), 'console.log("ready");');

  const bundlePath = path.join(tempDir, 'sample-extension.mcpb');
  const packResult = await bundleExtension(extensionDir, bundlePath, true);
  assert.strictEqual(packResult, true, 'bundleExtension should return true on successful packaging');
  assert.strictEqual(fs.existsSync(bundlePath), true, 'Bundle file should be generated');

  // 4. unpackExtension extracts an .mcpb bundle archive into a target directory
  const unpackTargetDir = path.join(tempDir, 'unpacked-output');
  const unpackResult = await extractExtension(bundlePath, unpackTargetDir, true);
  assert.strictEqual(unpackResult, true, 'extractExtension should return true on successful extraction');

  const unpackedManifestPath = path.join(unpackTargetDir, 'manifest.json');
  const unpackedServerPath = path.join(unpackTargetDir, 'server.js');
  assert.strictEqual(fs.existsSync(unpackedManifestPath), true, 'Unpacked manifest.json should exist');
  assert.strictEqual(fs.existsSync(unpackedServerPath), true, 'Unpacked server.js should exist');

  const unpackedManifestContent = JSON.parse(fs.readFileSync(unpackedManifestPath, 'utf8'));
  assert.strictEqual(unpackedManifestContent.name, 'sample-pack-extension', 'Unpacked manifest name should match');
  assert.strictEqual(fs.readFileSync(unpackedServerPath, 'utf8'), 'console.log("ready");', 'Unpacked server.js content should match');

  console.log('All contract assertions passed successfully.');
} finally {
  fs.rmSync(tempDir, { recursive: true, force: true });
}