Inspector

MCPJam is a testing, debugging and evaluation toolkit for Model Context Protocol servers, and the Inspector is its core open source playground. Developers connect a server, call its tools, compare how different models use them, and read the full request trace. Beyond the Inspector, the product includes an OAuth debugger that visualizes each step of the authorization flow with spec conformance checks, cross client testing across more than 16 major AI clients such as ChatGPT, Claude and Cursor, and LLM powered evals that generate a suite from a server's tools and report accuracy, latency and failure patterns. CI and CD actions let evals gate pull requests in GitHub Actions. User Testing provides shareable environments that mirror major AI hosts, and Swarms runs simulated user personas through multi turn journeys. Agent Skills can be loaded alongside servers for local testing. It can be launched locally with a single npx command, in a web app, or as a desktop app for macOS and Windows. A CLI and SDK are available. The Free plan costs $0 per month with 200 credits per day and unlimited seats. Pro is $24 per month billed annually at $288 per year, with 5,000 credits per month and unlimited trace history. Team is $199 per month billed annually at $2,388 per year, with 50,000 credits per month and basic RBAC. Additional credits are $10 per 1,000 on Pro and $9 on Team. Enterprise pricing is custom and adds advanced RBAC, SSO and audit logs.