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mcp-inspector-integration

Testing & Quality
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Set up MCP Inspector for debugging and testing MCP servers with request logging, response inspection, and protocol validation.

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Source SKILL.md: https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/cli-mcp-development/skills/mcp-inspector-integration/SKILL.md

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MCP Inspector Integration

Set up MCP Inspector for debugging and testing MCP servers.

Capabilities

  • Configure MCP Inspector connection
  • Set up request/response logging
  • Implement protocol debugging
  • Create test scenarios
  • Generate inspection reports
  • Configure development workflows

Usage

Invoke this skill when you need to:

  • Debug MCP server communication
  • Test tool and resource handlers
  • Inspect protocol messages
  • Validate MCP implementation

Inputs

ParameterTypeRequiredDescription
serverPathstringYesPath to MCP server entry
transportstringNoTransport type (stdio, sse)
loggingbooleanNoEnable verbose logging

Generated Patterns

Inspector Configuration

{
  "mcpServers": {
    "my-server": {
      "command": "node",
      "args": ["dist/index.js"],
      "env": {
        "DEBUG": "mcp:*",
        "NODE_ENV": "development"
      }
    }
  }
}

Debug Wrapper Script

#!/usr/bin/env node
import { createServer } from './server';

// Enable debug logging
process.env.DEBUG = 'mcp:*';

// Log all stdin/stdout for debugging
const originalWrite = process.stdout.write.bind(process.stdout);
process.stdout.write = (chunk: any, ...args: any[]) => {
  if (process.env.MCP_DEBUG_LOG) {
    const fs = require('fs');
    fs.appendFileSync(
      process.env.MCP_DEBUG_LOG,
      `[OUT] ${new Date().toISOString()} ${chunk}\n`
    );
  }
  return originalWrite(chunk, ...args);
};

process.stdin.on('data', (chunk) => {
  if (process.env.MCP_DEBUG_LOG) {
    const fs = require('fs');
    fs.appendFileSync(
      process.env.MCP_DEBUG_LOG,
      `[IN] ${new Date().toISOString()} ${chunk}\n`
    );
  }
});

// Start server
createServer();

NPM Scripts for Development

{
  "scripts": {
    "dev": "tsx watch src/index.ts",
    "debug": "MCP_DEBUG_LOG=./debug.log tsx src/index.ts",
    "inspect": "npx @anthropic/mcp-inspector node dist/index.js",
    "test:mcp": "npx @anthropic/mcp-inspector --test node dist/index.js"
  }
}

Test Scenarios

// tests/mcp-scenarios.ts
export const testScenarios = [
  {
    name: 'List Tools',
    request: {
      jsonrpc: '2.0',
      method: 'tools/list',
      id: 1,
    },
    validate: (response: any) => {
      return response.result?.tools?.length > 0;
    },
  },
  {
    name: 'Call Tool - search_files',
    request: {
      jsonrpc: '2.0',
      method: 'tools/call',
      params: {
        name: 'search_files',
        arguments: { pattern: '*.ts', path: './src' },
      },
      id: 2,
    },
    validate: (response: any) => {
      return !response.error && response.result?.content;
    },
  },
  {
    name: 'List Resources',
    request: {
      jsonrpc: '2.0',
      method: 'resources/list',
      id: 3,
    },
    validate: (response: any) => {
      return Array.isArray(response.result?.resources);
    },
  },
];

// Run test scenarios
export async function runScenarios(
  send: (msg: any) => Promise<any>
): Promise<void> {
  for (const scenario of testScenarios) {
    console.log(`Testing: ${scenario.name}`);
    const response = await send(scenario.request);
    const passed = scenario.validate(response);
    console.log(`  ${passed ? '✓ PASS' : '✗ FAIL'}`);
    if (!passed) {
      console.log('  Response:', JSON.stringify(response, null, 2));
    }
  }
}

Workflow

  1. Install Inspector - Set up MCP Inspector
  2. Configure connection - Server path and args
  3. Enable logging - Debug output
  4. Create scenarios - Test cases
  5. Run inspection - Debug session
  6. Generate report - Inspection results

Target Processes

  • mcp-server-monitoring-debugging
  • mcp-server-testing-suite
  • mcp-tool-implementation