{"data":{"slug":"mcpjam","name":"MCPJam","tagline":"OSS MCP testing, debugging, and evals platform","category":"agents","categoryName":"AI Agents","url":"https://www.mcpjam.com","github":"https://github.com/MCPJam/inspector","pricing":"open-source","hook":"MCPJam is the MCP developer bench: chat, inspect, OAuth-debug, and eval servers the way real clients will call them.","whatsGood":"Apache-2.0 core (MCPJam/inspector) with CLI/SDK/inspector packages (`@mcpjam/inspector`). Local and hosted (app.mcpjam.com) paths for tool inspection, cross-client behavior checks, and CI-shaped gates. Docs at docs.mcpjam.com. ★~2.2k — the productized MCP test harness beyond a one-off poke UI.","theCatch":"Vs MCP Inspector (official MIT debugger): MCPJam is the broader test/eval platform with hosted gravity, not only the reference inspector. Some `/server/services` and evals paths are separately licensed proprietary portions — treat the free OSS inspector path as the bar, not every hosted feature.","verdict":"Apache-2.0 MCP test platform. Use for real-client MCP debugging/evals; watch the proprietary evals carve-out.","addedAt":"2026-09-18","featured":false,"domain":"AI Agents","subSpecialty":"Agents","subcategory":"MCP","tags":["mcp","self-host","permissive","license-unclear","evals","auth","testing","active"],"capabilities":["mcp"],"surfaces":["MCP","Self-host"],"ecosystem":["Multi-platform"],"licenseModel":"Apache-2.0","githubStars":2271,"starsPerWeek":31,"access":"free","archived":false,"repo":{"createdAt":"2025-05-23","pushedAt":"2026-10-19","license":"NOASSERTION","archived":false,"checkedAt":"2026-10-19"}},"related":[{"slug":"claude-code","name":"Claude Code","tagline":"Terminal-first coding agent with deep repository context"},{"slug":"cursor","name":"Cursor","tagline":"The AI-first code editor that understands your codebase"},{"slug":"devin","name":"Devin","tagline":"Autonomous AI engineer for defined engineering tasks"},{"slug":"stagehand","name":"Stagehand","tagline":"AI-native browser automation that mixes code and natural language"},{"slug":"browser-use","name":"Browser Use","tagline":"Open-source framework for LLM-driven browser agents"}],"links":{"self":"/api/gems/mcpjam","html":"/gems/mcpjam","markdown":"/gems/mcpjam.md","category":"/api/gems?category=agents","categoryPage":"/stacks/agents"}}