CodeSampleX

Ejemplo

@modelcontextprotocol/sdk 1.30.0: StdioServerTransport

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

sha256:61846f350f8bf7b67741d78dd0fe20276b8258f46939771509e4e78f773d1d1c

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…		 2026-08-27

Caso

HOW
Objetivo
verify @modelcontextprotocol/sdk.StdioServerTransport in pkg:npm/%40modelcontextprotocol/sdk@1.30.0
Paquetes
Símbolos
  • @modelcontextprotocol/sdk.StdioServerTransport
Entorno
node 22.23.2
Creado
2026-08-27T22:01:26Z

Contrato

  1. StdioServerTransport exports a transport class implementing the MCP Transport interface over Node.js streams
  2. StdioServerTransport constructor accepts custom stdin and stdout streams with optional buffer limits
  3. StdioServerTransport start begins listening on stdin and rejects subsequent start invocations
  4. StdioServerTransport send serializes JSON-RPC messages with newline delimiters to stdout
  5. StdioServerTransport parses incoming newline-delimited JSON-RPC messages from stdin and invokes onmessage
  6. StdioServerTransport close removes stream listeners, clears internal read buffer, and invokes onclose
  7. StdioServerTransport onerror triggers on input exceeding maxBufferSize or malformed JSON payloads
  8. MCP Server connects to StdioServerTransport and processes JSON-RPC initialize requests

Archivos

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • 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 @modelcontextprotocol/sdk.StdioServerTransport 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.StdioServerTransport

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-lock.json
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package.json
{
  "name": "sample-mcp-stdio-server-transport",
  "version": "1.0.0",
  "private": true,
  "license": "MIT-0",
  "main": "src/index.js",
  "dependencies": {
    "@modelcontextprotocol/sdk": "1.30.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @modelcontextprotocol/sdk.StdioServerTransport in pkg:npm/%40modelcontextprotocol/sdk@1.30.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40modelcontextprotocol/sdk@1.30.0"
  ],
  "symbols": [
    "@modelcontextprotocol/sdk.StdioServerTransport"
  ]
}
src/index.js
const { StdioServerTransport } = require('@modelcontextprotocol/sdk/server/stdio.js');
const { Server } = require('@modelcontextprotocol/sdk/server/index.js');

/**
 * Creates a configured StdioServerTransport instance with optional custom streams and options.
 *
 * @param {import('node:stream').Readable} [stdin] - Readable stream for receiving JSON-RPC messages.
 * @param {import('node:stream').Writable} [stdout] - Writable stream for sending JSON-RPC messages.
 * @param {object} [options] - Transport options such as maxBufferSize.
 * @returns {StdioServerTransport} StdioServerTransport instance.
 */
function createStdioServerTransport(stdin, stdout, options) {
  return new StdioServerTransport(stdin, stdout, options);
}

/**
 * Creates and initializes an MCP Server attached to a given transport.
 *
 * @param {object} serverInfo - Server name and version metadata.
 * @param {object} [serverOptions] - Server capabilities and options.
 * @param {StdioServerTransport} [transport] - Stdio transport to connect.
 * @returns {Promise<{ server: Server, transport: StdioServerTransport }>}
 */
async function createAndConnectServer(serverInfo, serverOptions, transport) {
  const server = new Server(serverInfo, serverOptions);
  const activeTransport = transport || createStdioServerTransport();
  await server.connect(activeTransport);
  return { server, transport: activeTransport };
}

module.exports = {
  StdioServerTransport,
  Server,
  createStdioServerTransport,
  createAndConnectServer
};
test/contract.mjs
import assert from 'node:assert/strict';
import { PassThrough } from 'node:stream';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const {
  StdioServerTransport,
  Server,
  createStdioServerTransport,
  createAndConnectServer
} = require('../src/index.js');
const sdkStdio = require('@modelcontextprotocol/sdk/server/stdio.js');

// 1. Verify module export and constructor
assert.equal(typeof StdioServerTransport, 'function', 'StdioServerTransport must be a constructor function');
assert.strictEqual(
  StdioServerTransport,
  sdkStdio.StdioServerTransport,
  'StdioServerTransport must match @modelcontextprotocol/sdk/server/stdio.js export'
);

// 2. Instantiate with custom streams and verify message transmission over stdout
const stdinStream = new PassThrough();
const stdoutStream = new PassThrough();
const transport = createStdioServerTransport(stdinStream, stdoutStream, { maxBufferSize: 4096 });

assert.equal(typeof transport.start, 'function', 'transport must implement start()');
assert.equal(typeof transport.close, 'function', 'transport must implement close()');
assert.equal(typeof transport.send, 'function', 'transport must implement send()');

let receivedMessage = null;
transport.onmessage = (msg) => {
  receivedMessage = msg;
};

let closeCalled = false;
transport.onclose = () => {
  closeCalled = true;
};

let errorReceived = null;
transport.onerror = (err) => {
  errorReceived = err;
};

await transport.start();

// 3. Verify calling start() more than once throws an error
await assert.rejects(
  async () => {
    await transport.start();
  },
  (err) => err instanceof Error && /already started/i.test(err.message),
  'Calling start() on an already started transport must reject'
);

// 4. Verify sending a JSON-RPC message writes newline-delimited JSON to stdout
const stdoutChunks = [];
stdoutStream.on('data', (chunk) => stdoutChunks.push(chunk));

const outgoingPayload = {
  jsonrpc: '2.0',
  id: 1,
  result: { initialized: true }
};

await transport.send(outgoingPayload);

const writtenOutput = Buffer.concat(stdoutChunks).toString('utf8');
assert.equal(
  writtenOutput,
  JSON.stringify(outgoingPayload) + '\n',
  'transport.send() must serialize JSON-RPC payload with trailing newline'
);

// 5. Verify receiving newline-delimited JSON-RPC messages from stdin triggers onmessage
const incomingPayload = {
  jsonrpc: '2.0',
  id: 2,
  method: 'ping'
};

stdinStream.write(JSON.stringify(incomingPayload) + '\n');
assert.deepEqual(
  receivedMessage,
  incomingPayload,
  'transport.onmessage must receive parsed JSON-RPC payload from stdin'
);

// 6. Verify closing the transport clears buffer and invokes onclose
await transport.close();
assert.equal(closeCalled, true, 'transport.close() must invoke onclose callback');

// 7. Verify error handling for buffer overflow when exceeding maxBufferSize
const overflowStdin = new PassThrough();
const overflowStdout = new PassThrough();
const smallTransport = new StdioServerTransport(overflowStdin, overflowStdout, { maxBufferSize: 32 });

let overflowError = null;
smallTransport.onerror = (err) => {
  overflowError = err;
};

await smallTransport.start();
overflowStdin.write('X'.repeat(64) + '\n');

assert(
  overflowError instanceof Error,
  'Exceeding maxBufferSize must trigger onerror callback'
);
assert.match(
  overflowError.message,
  /exceeded maximum size/i,
  'Error message must indicate buffer limit exceeded'
);

// 8. Verify error handling on malformed JSON payload
const malformedStdin = new PassThrough();
const malformedStdout = new PassThrough();
const parseErrorTransport = new StdioServerTransport(malformedStdin, malformedStdout);

let parseError = null;
parseErrorTransport.onerror = (err) => {
  parseError = err;
};

await parseErrorTransport.start();
malformedStdin.write('{invalid-json-content\n');

assert(
  parseError instanceof Error,
  'Malformed JSON input must trigger onerror callback'
);

// 9. Verify MCP Server connects cleanly with StdioServerTransport and handles initialize request
const serverStdin = new PassThrough();
const serverStdout = new PassThrough();
const serverTransport = new StdioServerTransport(serverStdin, serverStdout);

const { server } = await createAndConnectServer(
  { name: 'test-stdio-server', version: '1.0.0' },
  { capabilities: { tools: {} } },
  serverTransport
);

const serverOutputChunks = [];
serverStdout.on('data', (chunk) => serverOutputChunks.push(chunk));

const initializeRequest = {
  jsonrpc: '2.0',
  id: 100,
  method: 'initialize',
  params: {
    protocolVersion: '2024-11-05',
    capabilities: {},
    clientInfo: { name: 'test-client', version: '1.0.0' }
  }
};

serverStdin.write(JSON.stringify(initializeRequest) + '\n');

// Allow async protocol cycle to process
await new Promise((resolve) => setTimeout(resolve, 50));

const serverResponseRaw = Buffer.concat(serverOutputChunks).toString('utf8');
const serverResponse = JSON.parse(serverResponseRaw.trim());

assert.equal(serverResponse.id, 100, 'Server response id must match initialize request id');
assert.equal(serverResponse.result.serverInfo.name, 'test-stdio-server', 'Server name must match configured value');
assert.equal(serverResponse.result.serverInfo.version, '1.0.0', 'Server version must match configured value');

await server.close();

console.log('Contract tests passed successfully.');

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