CodeSampleX

Пример

@modelcontextprotocol/sdk 1.30.0: InMemoryTransport

Проверенный пример — npm @modelcontextprotocol/sdk 1.30.0: InMemoryTransport. Контракт выполнен на node 22 · linux alpine/x64 · docker и пройден.

sha256:723d01312332a45da66bb438c87105e07cd381d63c0a410fe9a778c078177556

Эта сеть предлагает одно: образец, который собирается. Она запустила его в песочнице и сохранила подписанную квитанцию. Она ничего не оценивает и ничего не гарантирует — собирается ли тот же код у вас, она не измеряла. Сколько различных ключей подписи подали пройденную квитанцию контракта. Один — только автор; больше одного — значит, кто-то ещё тоже собрал. Ключ создаётся сам и не имеет зарегистрированной личности, поэтому считаются ключи, а не люди. MIT-0

Свидетельства выполнения

Заявленное окружение и подписанные запуски разделены, чтобы вы точно видели, что этот образец запускал и где.

Основа свидетельства
Подписанный контракт пройден
Квитанции проверки
1
Ключи подписи, собравшие его
1
Заявленная среда linux 24 · ubuntu · glibc 2.39 x64 npm

Среды запусков проверки

Окружение Контракт Этапы Запуск
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-28

Кейс

HOW
Цель
verify @modelcontextprotocol/sdk.InMemoryTransport in pkg:npm/%40modelcontextprotocol/sdk@1.30.0
Пакеты
Символы
  • @modelcontextprotocol/sdk.InMemoryTransport
Создан
2026-08-28T05:33:15Z

Контракт

  1. assert InMemoryTransport.createLinkedPair links client and server communication in-process
  2. assert Client.connect executes automatic initialize handshake, emitting initialized notification and populating getServerCapabilities
  3. assert Client.registerCapabilities and Client.connect throw if invoked on an already connected client instance
  4. assert callTool returns content array and resolves with isError true rather than throwing for application tool errors
  5. assert server McpError preserves explicit ErrorCode while unhandled exceptions are mapped to ErrorCode.InternalError
  6. assert requests exceeding timeout reject with ErrorCode.RequestTimeout and DEFAULT_REQUEST_TIMEOUT_MSEC is 60000ms
  7. assert pending in-flight requests reject with ErrorCode.ConnectionClosed when the transport is closed

Файлы

  • NOTES.md
  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • test/contract.mjs

Скачать артефакт с исходным кодом (tar.gz)

Исходный код

NOTES.md
# Notes: Model Context Protocol (MCP) TypeScript SDK InMemoryTransport Contract

## 1. What search_known_solution answered
`search_known_solution` returned a REVERIFY decision on an existing sample built on linux alpine (musl), requiring verification in our glibc Linux environment.

## 2. What a competent model would have written instead
A competent model often attempts root ESM imports `import { Client, InMemoryTransport, McpError } from '@modelcontextprotocol/sdk'`, assumes `callTool()` throws on application tool failures or returns raw strings/objects, assumes unhandled server exceptions retain their original JavaScript Error class, and guesses default request timeouts around 5000ms.

## 3. How the wrong version fails
Root ESM imports fail loudly at startup with `ERR_MODULE_NOT_FOUND` due to missing `dist/esm/index.js`, while treating tool failures as thrown exceptions fails silently with a green build because the MCP protocol resolves tool errors cleanly as `{ isError: true, content: [...] }` instead of rejecting the RPC promise.
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 @modelcontextprotocol/sdk.InMemoryTransport in pkg:npm/%40modelcontextprotocol/sdk@1.30.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40modelcontextprotocol/sdk@1.30.0
Demonstrate these symbols/APIs:
  - @modelcontextprotocol/sdk.InMemoryTransport

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:sha256:1e4dfee41a51853854a71167ee682f876a9f6ec3b280bf9a1dc309dcbfe9ca0c","contract":["assert InMemoryTransport.createLinkedPair links client and server communication in-process","assert Client.connect executes automatic initialize handshake, emitting initialized notification and populating getServerCapabilities","assert Client.registerCapabilities and Client.connect throw if invoked on an already connected client instance","assert callTool returns content array and resolves with isError true rather than throwing for application tool errors","assert server McpError preserves explicit ErrorCode while unhandled exceptions are mapped to ErrorCode.InternalError","assert requests exceeding timeout reject with ErrorCode.RequestTimeout and DEFAULT_REQUEST_TIMEOUT_MSEC is 60000ms","assert pending in-flight requests reject with ErrorCode.ConnectionClosed when the transport is closed"],"goal":"verify @modelcontextprotocol/sdk.InMemoryTransport in pkg:npm/%40modelcontextprotocol/sdk@1.30.0","kind":"HOW","packages":["pkg:npm/%40modelcontextprotocol/sdk@1.30.0"],"schemaVersion":1,"symbols":["@modelcontextprotocol/sdk.InMemoryTransport"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40modelcontextprotocol/sdk@1.30.0"],"schemaVersion":1,"subject":"pkg:npm/%40modelcontextprotocol/sdk@1.30.0","symbols":["@modelcontextprotocol/sdk.InMemoryTransport"],"verifierAdapter":"node-typescript@1"}
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package.json
{
  "name": "npm-modelcontextprotocol-sdk-inmemory-sample",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@modelcontextprotocol/sdk": "1.30.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @modelcontextprotocol/sdk.InMemoryTransport in pkg:npm/%40modelcontextprotocol/sdk@1.30.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40modelcontextprotocol/sdk@1.30.0"
  ],
  "symbols": [
    "@modelcontextprotocol/sdk.InMemoryTransport"
  ]
}
src/index.mjs
import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { Server } from '@modelcontextprotocol/sdk/server/index.js';
import { InMemoryTransport } from '@modelcontextprotocol/sdk/inMemory.js';
import {
  ErrorCode,
  McpError,
  LATEST_PROTOCOL_VERSION,
  SUPPORTED_PROTOCOL_VERSIONS,
  CallToolRequestSchema,
  ListToolsRequestSchema,
} from '@modelcontextprotocol/sdk/types.js';
import { DEFAULT_REQUEST_TIMEOUT_MSEC } from '@modelcontextprotocol/sdk/shared/protocol.js';

/**
 * Creates and connects a paired MCP Client and Server in-memory via InMemoryTransport.
 */
export async function createConnectedMcpPair({
  clientInfo = { name: 'test-client', version: '1.0.0' },
  serverInfo = { name: 'test-server', version: '1.0.0' },
  clientCapabilities = {},
  serverCapabilities = { tools: {} },
} = {}) {
  const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();

  const server = new Server(serverInfo, { capabilities: serverCapabilities });
  const client = new Client(clientInfo, { capabilities: clientCapabilities });

  // Attach server transport first
  await server.connect(serverTransport);
  // Connecting client transport executes the initialize handshake automatically
  await client.connect(clientTransport);

  return { client, server, clientTransport, serverTransport };
}

/**
 * Helper to register standard sample tools on an MCP Server.
 */
export function registerSampleTools(server) {
  server.setRequestHandler(ListToolsRequestSchema, async () => {
    return {
      tools: [
        {
          name: 'compute_sum',
          description: 'Calculates the sum of numbers a and b',
          inputSchema: {
            type: 'object',
            properties: {
              a: { type: 'number' },
              b: { type: 'number' },
            },
            required: ['a', 'b'],
          },
        },
        {
          name: 'throw_mcp_error',
          description: 'Throws an McpError with InvalidParams',
          inputSchema: { type: 'object' },
        },
        {
          name: 'throw_generic_error',
          description: 'Throws a standard JavaScript Error',
          inputSchema: { type: 'object' },
        },
        {
          name: 'report_tool_failure',
          description: 'Returns isError true payload in result content',
          inputSchema: { type: 'object' },
        },
        {
          name: 'slow_operation',
          description: 'Deliberately delays response to test timeout handling',
          inputSchema: {
            type: 'object',
            properties: {
              delayMs: { type: 'number' },
            },
          },
        },
        {
          name: 'hang_forever',
          description: 'Never returns, used to test connection close',
          inputSchema: { type: 'object' },
        },
      ],
    };
  });

  server.setRequestHandler(CallToolRequestSchema, async (request) => {
    const { name, arguments: args } = request.params;

    switch (name) {
      case 'compute_sum': {
        const a = Number(args?.a ?? 0);
        const b = Number(args?.b ?? 0);
        return {
          content: [
            {
              type: 'text',
              text: String(a + b),
            },
          ],
        };
      }

      case 'throw_mcp_error':
        throw new McpError(ErrorCode.InvalidParams, 'Explicit parameter validation error');

      case 'throw_generic_error':
        throw new Error('Database connection pool exhausted');

      case 'report_tool_failure':
        return {
          isError: true,
          content: [
            {
              type: 'text',
              text: 'Tool execution failed: file not found on disk',
            },
          ],
        };

      case 'slow_operation': {
        const delay = Number(args?.delayMs ?? 300);
        await new Promise((resolve) => setTimeout(resolve, delay));
        return {
          content: [{ type: 'text', text: 'operation completed' }],
        };
      }

      case 'hang_forever':
        return new Promise(() => {});

      default:
        throw new McpError(ErrorCode.MethodNotFound, `Tool not found: ${name}`);
    }
  });
}

export {
  Client,
  Server,
  InMemoryTransport,
  ErrorCode,
  McpError,
  LATEST_PROTOCOL_VERSION,
  SUPPORTED_PROTOCOL_VERSIONS,
  DEFAULT_REQUEST_TIMEOUT_MSEC,
  CallToolRequestSchema,
  ListToolsRequestSchema,
};
test/contract.mjs
import { strict as assert } from 'node:assert';
import {
  createConnectedMcpPair,
  registerSampleTools,
  Client,
  Server,
  InMemoryTransport,
  ErrorCode,
  McpError,
  LATEST_PROTOCOL_VERSION,
  SUPPORTED_PROTOCOL_VERSIONS,
  DEFAULT_REQUEST_TIMEOUT_MSEC,
} from '../src/index.mjs';

async function runContract() {
  // --- Proof 1: InMemoryTransport.createLinkedPair links client and server communication in-process ---
  const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();
  assert(clientTransport instanceof InMemoryTransport, 'clientTransport must be an InMemoryTransport instance');
  assert(serverTransport instanceof InMemoryTransport, 'serverTransport must be an InMemoryTransport instance');

  const server = new Server(
    { name: 'contract-server', version: '2.1.0' },
    { capabilities: { tools: {}, prompts: {} } }
  );
  registerSampleTools(server);

  const client = new Client(
    { name: 'contract-client', version: '1.0.0' },
    { capabilities: { roots: {} } }
  );

  // Before connecting, capabilities and server version are undefined
  assert.equal(client.getServerCapabilities(), undefined, 'getServerCapabilities must be undefined before connect');
  assert.equal(client.getServerVersion(), undefined, 'getServerVersion must be undefined before connect');

  // --- Proof 2: Client.connect executes automatic initialize handshake, emitting initialized notification and populating capabilities ---
  let serverInitializedEmitted = false;
  server.oninitialized = () => {
    serverInitializedEmitted = true;
  };

  await server.connect(serverTransport);
  await client.connect(clientTransport);

  assert.equal(serverInitializedEmitted, true, 'Server oninitialized callback must be invoked after handshake');
  assert.deepEqual(client.getServerCapabilities(), { tools: {}, prompts: {} }, 'Server capabilities must be recorded on Client');
  assert.deepEqual(client.getServerVersion(), { name: 'contract-server', version: '2.1.0' }, 'Server version info must be recorded on Client');

  // Protocol version constant verification
  assert.equal(LATEST_PROTOCOL_VERSION, '2025-11-25', 'LATEST_PROTOCOL_VERSION must match spec string 2025-11-25');
  assert(SUPPORTED_PROTOCOL_VERSIONS.includes(LATEST_PROTOCOL_VERSION), 'LATEST_PROTOCOL_VERSION must be in SUPPORTED_PROTOCOL_VERSIONS');

  // --- Proof 3: Client.registerCapabilities and Client.connect throw if invoked on an already connected client instance ---
  assert.throws(
    () => client.registerCapabilities({ sampling: {} }),
    /Cannot register capabilities after connecting to transport/,
    'Registering capabilities after connect must throw an error'
  );

  await assert.rejects(
    () => client.connect(clientTransport),
    /Already connected to a transport/,
    'Connecting an already connected client without closing must reject'
  );

  // --- Proof 4: callTool returns content array and resolves with isError true rather than throwing for application tool errors ---
  const sumResult = await client.callTool({
    name: 'compute_sum',
    arguments: { a: 15, b: 27 },
  });
  assert.equal(sumResult.isError, undefined, 'Successful tool call must have isError undefined');
  assert(Array.isArray(sumResult.content), 'Result content must be an array of content blocks');
  assert.deepEqual(sumResult.content, [{ type: 'text', text: '42' }]);

  // Tool reporting failure via isError: true must RESOLVE normally, NOT throw
  const appErrorResult = await client.callTool({
    name: 'report_tool_failure',
    arguments: {},
  });
  assert.equal(appErrorResult.isError, true, 'Application tool error must return isError: true in result');
  assert.equal(appErrorResult.content[0].type, 'text');
  assert.match(appErrorResult.content[0].text, /file not found/);

  // --- Proof 5: Server McpError preserves explicit ErrorCode while unhandled exceptions are mapped to ErrorCode.InternalError ---
  await assert.rejects(
    () => client.callTool({ name: 'throw_mcp_error' }),
    (err) => {
      assert(err instanceof McpError, 'Must be an McpError instance');
      assert.equal(err.name, 'McpError');
      assert.equal(err.code, ErrorCode.InvalidParams);
      assert.equal(err.code, -32602);
      assert.match(err.message, /Explicit parameter validation error/);
      return true;
    },
    'Server McpError must propagate with its specific JSON-RPC error code'
  );

  await assert.rejects(
    () => client.callTool({ name: 'throw_generic_error' }),
    (err) => {
      assert(err instanceof McpError, 'Generic Error must be wrapped into McpError on client');
      assert.equal(err.code, ErrorCode.InternalError);
      assert.equal(err.code, -32603);
      assert.match(err.message, /Database connection pool exhausted/);
      return true;
    },
    'Unhandled server error must be mapped to ErrorCode.InternalError (-32603)'
  );

  // Non-existent tool returns MethodNotFound (-32601)
  await assert.rejects(
    () => client.callTool({ name: 'unknown_tool_xyz' }),
    (err) => {
      assert(err instanceof McpError);
      assert.equal(err.code, ErrorCode.MethodNotFound);
      assert.equal(err.code, -32601);
      return true;
    }
  );

  // --- Proof 6: Requests exceeding timeout reject with ErrorCode.RequestTimeout and DEFAULT_REQUEST_TIMEOUT_MSEC is 60000ms ---
  assert.equal(DEFAULT_REQUEST_TIMEOUT_MSEC, 60000, 'DEFAULT_REQUEST_TIMEOUT_MSEC must be 60000 (60s)');

  await assert.rejects(
    () => client.callTool({ name: 'slow_operation', arguments: { delayMs: 200 } }, undefined, { timeout: 30 }),
    (err) => {
      assert(err instanceof McpError, 'Timeout must throw McpError');
      assert.equal(err.code, ErrorCode.RequestTimeout);
      assert.equal(err.code, -32001);
      assert.match(err.message, /Request timed out/);
      return true;
    },
    'Request exceeding timeout must reject with ErrorCode.RequestTimeout (-32001)'
  );

  // --- Proof 7: Pending in-flight requests reject with ErrorCode.ConnectionClosed when the transport is closed ---
  const inFlightPromise = client.callTool({ name: 'hang_forever' });
  // Allow the request message to reach the server handler before closing
  await new Promise((resolve) => setTimeout(resolve, 20));

  // Trigger client close while request is pending
  const closePromise = client.close();

  await assert.rejects(
    inFlightPromise,
    (err) => {
      assert(err instanceof McpError, 'In-flight request on closed connection must reject with McpError');
      assert.equal(err.code, ErrorCode.ConnectionClosed);
      assert.equal(err.code, -32000);
      assert.match(err.message, /Connection closed/);
      return true;
    },
    'In-flight requests must reject with ErrorCode.ConnectionClosed (-32000) when client is closed'
  );

  await closePromise;
  await server.close();

  console.log('CONTRACT PASS: @modelcontextprotocol/sdk client lifecycle, transport, and error contracts verified.');
}

runContract().catch((err) => {
  console.error('CONTRACT FAIL:', err);
  process.exit(1);
});

Исходный сидер

аноним