mcp-jest
Automated testing for Model Context Protocol (MCP) servers. Test your AI agent tools with Jest-like syntax, validate protocol compliance, and integrate with CI/CD.
- 🧪 Test tools, resources, and prompts — automated validation of your MCP server capabilities
- 📦 Zero config — works out-of-the-box with any MCP server (stdio, HTTP, SSE)
- ✅ Protocol validation — check MCP compliance with detailed scoring
- 🚀 CI/CD ready — GitHub Actions, Jenkins, CircleCI integration
- 📸 Snapshot testing — capture and compare outputs over time
Install
npm install mcp-jest # Project dependency
npm install -g mcp-jest # Or globally for CLI
Use It
Test your MCP server in 30 seconds:
mcp-jest node ./server.js --tools search,email
Or use the JavaScript API:
import { mcpTest } from 'mcp-jest';
const results = await mcpTest(
{ command: 'node', args: ['./server.js'] },
{ tools: ['search', 'email'] }
);
console.log(`${results.passed}/${results.total} tests passed`);
What is MCP?
Model Context Protocol (MCP) is an open standard by Anthropic that lets AI assistants (Claude, ChatGPT, Gemini) connect to external tools, databases, and APIs. MCP-Jest tests those connections.
Why MCP-Jest?
You built an MCP server. But how do you know it works?
- Manual testing is slow and error-prone
- Silent failures break AI workflows
- No native CI/CD integration for MCP
- Debugging production failures is hard
MCP-Jest solves this with automated, repeatable testing.
Features
Core Testing
- Automated Testing - Write tests once, run them everywhere
- Comprehensive Coverage - Test connections, tools, resources, and prompts
- Flexible Expectations - Simple strings or custom validation functions
- CI/CD Ready - Works with GitHub Actions, Jenkins, CircleCI, etc.
Advanced Features
- Snapshot Testing - Capture and compare MCP outputs over time
- Test Filtering - Run specific tests with
--filterand--skip - Watch Mode - Auto-rerun tests when files change
- HTML Reports - Generate beautiful, shareable test reports
Transport Support
- stdio - Default transport for local servers
- HTTP Streaming - Test remote HTTP servers
- SSE - Server-Sent Events support
Developer Tools
- Auto-Discovery - Automatically discover and generate tests for all capabilities
- Protocol Validator - Check MCP compliance with detailed scoring
- GitHub Action - Native CI/CD integration
CLI Quick Reference
Common Options
See CLI Reference for all options.
Example: CI/CD Integration
# .github/workflows/test.yml
- name: Test MCP Server
run: |
npm install -g mcp-jest
mcp-jest node ./dist/server.js --tools "search,analyze"
Example: Config File
{
"server": {
"command": "node",
"args": ["./server.js"]
},
"tests": {
"tools": {
"search": {
"args": { "query": "test" },
"expect": "content.length > 0"
}
},
"timeout": 30000
}
}
Documentation
Feature Guides
Requirements
- Node.js 18+
- MCP Server implementing Model Context Protocol
Contributing
We welcome contributions! See CONTRIBUTING.md for guidelines.
git clone https://github.com/josharsh/mcp-jest.git
cd mcp-jest
npm install
npm run dev
npm test
Security
See SECURITY.md for our security policy and vulnerability reporting.
Use Cases
MCP-Jest is ideal for:
- MCP Server Developers - Test your tools, resources, and prompts before deployment
- AI Application Teams - Ensure your MCP integrations work correctly
- DevOps/SRE - Add MCP server testing to CI/CD pipelines
- Open Source MCP Projects - Provide reliable testing for community contributions
Comparison with Other Tools
Support
- GitHub Issues - Bug reports and feature requests
- GitHub Discussions - Questions and ideas
- Model Context Protocol - Official MCP documentation
Related Technologies
- Model Context Protocol (MCP) - The protocol standard
- @modelcontextprotocol/sdk - Official MCP SDK
- Claude - Anthropic's AI assistant with MCP support
- Jest - JavaScript testing framework (inspiration for MCP-Jest)
License
MIT License - Use freely in commercial and open source projects.
Project Status
Built for the MCP ecosystem | Documentation | Examples | Contributing
Keywords: mcp testing, model context protocol testing, mcp server testing, ai agent testing, llm testing, claude mcp, chatgpt mcp, mcp tools testing, mcp validator, anthropic mcp, test mcp server, mcp ci cd, automated mcp testing
