MCPJam

MCPJam is testing and evaluation infrastructure for MCP servers. Test your server locally with the Inspector, see how it behaves in ChatGPT, Claude, Cursor and Copilot with the client matrix, and gate every merge with evals in CI. The Inspector reproduces failures request by request. The client matrix shows exactly what works in every client, so a host change never quietly breaks your tests. Evals run in your own pipeline and confirm your server is production-ready before users interact with it. Over 50,000 developers and 200 enterprises use MCPJam, including Asana, Bright Data, Scalekit, IBM, Apollo, and Jeppesen ForeFlight. The core is open source and free: client, Inspector, CLI, SDK, local evals and conformance checks. Paid plans add live client matrix, swarms, user testing, AI insights, reporting, history, and enterprise governance. MCP eval and observability tools measure the software you built, in a system you control. MCPJam sits outside and confirms your software is ready for external agents before they call it.