Ejemplo

@anthropic-ai/mcpb 2.1.2: packExtension

Muestra verificada para npm @anthropic-ai/mcpb 2.1.2: packExtension. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó.

sha256:14cf833b54e3092027033102cadafaeb66061a59db001e82f09d2b8a194f0c64

MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia: Contrato firmado aprobado
Recibos de verificación: 1
Claves de firma que lo compilaron: 1

Entorno declarado node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Entornos de las ejecuciones de verificación

Entorno	Contrato	Etapas	Ejecución
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…	2026-09-15

Caso

HOW

Objetivo: verify @anthropic-ai/mcpb.packExtension in pkg:npm/%40anthropic-ai/mcpb@2.1.2
Paquetes: @anthropic-ai/mcpb 2.1.2
Símbolos: @anthropic-ai/mcpb.packExtension
Entorno: node 22.23.2
Creado: 2026-09-15T01:44:50Z

Contrato

assert packExtension is a function
assert packExtension packages an extension directory into an mcpb archive

Archivos

PROMPT.md
csx.json
index.js
package-lock.json
package.json
spec.json
test/contract.mjs

Descargar el artefacto de código fuente (tar.gz)

Código fuente

PROMPT.md

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 @anthropic-ai/mcpb.packExtension in 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
Demonstrate these symbols/APIs:
  - @anthropic-ai/mcpb.packExtension

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.

csx.json

{"case":{"caseId":"case:sha256:661bfa0146b4dcd5850cfc62427023a66fad8f4ae4733886e58f2b1236c6d9fd","contract":["assert packExtension is a function","assert packExtension packages an extension directory into an mcpb archive"],"goal":"verify @anthropic-ai/mcpb.packExtension in pkg:npm/%40anthropic-ai/mcpb@2.1.2","kind":"HOW","packages":["pkg:npm/%40anthropic-ai/mcpb@2.1.2"],"schemaVersion":1,"symbols":["@anthropic-ai/mcpb.packExtension"]},"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":["@anthropic-ai/mcpb.packExtension"],"verifierAdapter":"node-typescript@1"}

index.js

import { packExtension } from '@anthropic-ai/mcpb';

/**
 * Packages an MCP extension directory into an .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 });
}

export { packExtension };

package-lock.json

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  "lockfileVersion": 3,
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      "version": "1.0.0",
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        "@anthropic-ai/mcpb": "2.1.2"
      }
    },
    "node_modules/@anthropic-ai/mcpb": {
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        "pretty-bytes": "^5.6.0",
        "zod": "^3.25.67",
        "zod-to-json-schema": "^3.24.6"
      },
      "bin": {
        "mcpb": "dist/cli/cli.js"
      }
    },
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}

package.json

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

spec.json

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

test/contract.mjs

import assert from 'node:assert';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import { bundleExtension, packExtension } from '../index.js';

// 1. Symbol check: packExtension is a callable function
assert.strictEqual(typeof packExtension, 'function', 'packExtension must be a function');
assert.strictEqual(typeof bundleExtension, 'function', 'bundleExtension must be a function');

// 2. Functional contract: package an extension directory into an mcpb archive
const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'contract-pack-'));

try {
  const extensionDir = path.join(tempDir, 'sample-extension');
  fs.mkdirSync(extensionDir, { recursive: true });

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

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

  const bundlePath = path.join(tempDir, 'sample-extension.mcpb');

  const success = await bundleExtension(extensionDir, bundlePath, true);
  assert.strictEqual(success, true, 'bundleExtension should return true on successful packaging');
  assert.strictEqual(fs.existsSync(bundlePath), true, 'Bundle file should be generated');

  const stat = fs.statSync(bundlePath);
  assert(stat.size > 0, 'Bundle archive file size must be greater than 0');

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

Seeder de origen

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