MCP Mock Client

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Create mock MCP client for server testing with request/response simulation.

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Details

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What this skill tells your AI

The instructions your AI receives, as published by a5c-ai/babysitter in library/specializations/cli-mcp-development/skills/mcp-mock-client/SKILL.md and read by Ahel’s review.

Create mock MCP client for server testing.

Generated Patterns

import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { StdioClientTransport } from '@modelcontextprotocol/sdk/client/stdio.js';
import { spawn } from 'child_process';

export async function createTestClient(serverCmd: string, args: string[]) {
  const proc = spawn(serverCmd, args, { stdio: ['pipe', 'pipe', 'inherit'] });
  const transport = new StdioClientTransport({ reader: proc.stdout!, writer: proc.stdin! });
  const client = new Client({ name: 'test-client', version: '1.0.0' }, { capabilities: {} });
  await client.connect(transport);
  return { client, close: () => proc.kill() };
}

export async function testTool(client: Client, name: string, args: Record<string, unknown>) {
  const result = await client.callTool({ name, arguments: args });
  return result;
}

Target Processes

mcp-server-testing-suite
mcp-tool-implementation

Signals

GitHub stars: 2k
Forks: 113
Last commit: Sep 2026

Advanced

Item type: skill
Key: mcp-mock-client
Source: github.com/a5c-ai/babysitter

github.com/a5c-ai/babysitter