MCPJam — MCP server testing, debugging & evals

# MCPJam > Test and debug MCP servers, ChatGPT apps, and MCP apps. Open-source inspector, > OAuth debugger, evals, and cross-client testing — know your MCP server works > before your users do. ## Start here - [How to test an MCP server — the complete guide](https://www.mcpjam.com/mcp-server-testing): MCP server testing validates protocol, tool schemas, agent behavior, OAuth, and cross-client compatibility before production. The full workflow and a checklist. ## Features - [MCPJam Inspector — test & debug MCP servers locally](https://www.mcpjam.com/features/inspector): Open-source playground for MCP servers: connect a server, run its tools, compare models side by side, read the full waterfall trace. Free and npx-installable. - [Test Agent Skills + MCP locally](https://www.mcpjam.com/features/skills): Load Anthropic Agent Skills alongside your MCP servers and watch a real model use both. Skills viewer plus an LLM playground, running locally with one npx command. - [MCP OAuth & EMA debugger](https://www.mcpjam.com/features/oauth-debugger): The MCP OAuth Debugger visualizes every step of the auth flow so you see exactly where it breaks, with spec conformance checks and EMA Cross-App Access tracing. - [MCP evals — test how models use your server](https://www.mcpjam.com/features/cross-client-testing): Generate an eval suite from your MCP server's tools, run it with a real model, and get accuracy, latency, and diagnosed failure patterns, not only protocol checks. - [MCP testing SDK — @mcpjam/sdk](https://www.mcpjam.com/features/sdk): Test MCP servers in code with @mcpjam/sdk: connect clients, run unit and end-to-end tests, score agent-in-the-loop evals, and check OAuth conformance. - [MCPJam CLI — test MCP servers from the terminal](https://www.mcpjam.com/features/cli): Probe, debug, and test MCP servers from the terminal with the MCPJam CLI: run a full health check, OAuth conformance, tool calls, and evals in CI. - [CI/CD eval gates for MCP servers](https://