MCPJam
Inspector, OAuth debugger, cross-client matrix and CI evals for MCP servers
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mcpjam.comAbout MCPJam
MCPJam is a testing, debugging and evaluation platform for MCP servers. It starts where most people start — an inspector you run locally with `npx @mcpjam/inspector@latest`, or as a downloadable macOS and Windows app — and covers the parts of MCP development that are painful to reason about from logs alone. The OAuth and EMA debugger surfaces the exact step where authentication breaks rather than leaving you with a failed handshake. Cross-client testing shows how real clients differ: a capability matrix compares Claude, ChatGPT, Cursor, Copilot, VS Code and Cline against protocol features like roots, so you can see which of your server's capabilities a given client will actually exercise. A playground lets you drive tools interactively, and an evals system runs model-behaviour checks so you can assert that a client actually calls the right tool for a prompt. Those evals plug into CI/CD actions that gate every pull request on model behaviour, which is the piece that turns MCP work from manual poking into a regression suite. There is a JSON-RPC logger, an SDK for writing tests in code, a public server registry, and skills testing alongside MCP. The project is open source on GitHub with a free hosted web app, and the company positions separate surfaces for developers, product managers, engineering managers, platform leads and enterprise buyers.
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Key Features
MCPJam Pros & Cons
✅ Pros
- +Free tier is a real product, not a trial — inspector, OAuth debugger and logger included
- +Cross-client testing answers a question nothing else in the MCP tooling space does
- +Open source with an npx entry point, so trying it costs nothing
⚠️ Cons
- −Free daily credit and eval caps are low for sustained development
- −$38/seat list price is high next to free open-source MCP inspectors
- −SSO and audit retention are Enterprise-only
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