CodeSampleX

Ejemplo

@modelcontextprotocol/sdk 1.30.0: Client

Muestra verificada para npm @modelcontextprotocol/sdk 1.30.0: Client. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó.

sha256:55e6bbf577deecc6426fb1a481dc51fb81be9a196fce3df8a473c07eb0669d5a

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. 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 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

Caso

HOW
Objetivo
verify @modelcontextprotocol/sdk.Client in pkg:npm/%40modelcontextprotocol/sdk@1.30.0
Paquetes
Símbolos
  • @modelcontextprotocol/sdk.Client
Entorno
node 22.23.2
Creado
2026-08-28T05:31:34Z

Contrato

  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

Archivos

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

Descargar el artefacto de código fuente (tar.gz)

Código fuente

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

## 1. What search_known_solution answered
`search_known_solution` returned `COMPATIBLE (CONFIDENCE: LOW)` with no specific match for `@modelcontextprotocol/sdk` (falling back to unrelated samples for `httpx` and `socket.io-client`).

## 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.Client 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.Client
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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.
csx.json
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package.json
{
  "name": "npm-modelcontextprotocol-sdk-api",
  "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.Client in pkg:npm/%40modelcontextprotocol/sdk@1.30.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40modelcontextprotocol/sdk@1.30.0"
  ],
  "symbols": [
    "@modelcontextprotocol/sdk.Client"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
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.
 */
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 test 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':
        // Intentionally unresolved promise to keep request in-flight
        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);
});

Seeder de origen

anónimo