The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
npx ecc-install --profile fullFair-code workflow automation platform with native AI capabilities. Combine visual building with custom code, self-host or cloud, 400+ integrations.
npx n8nAn open-source AI agent that brings the power of Gemini directly into your terminal.
npx @google/gemini-cli
MCPJam is the development platform for MCP servers, MCP apps, and ChatGPT apps.
No more ngrok or ChatGPT/Claude subscription needed. MCPJam is the fastest way to iterate on any MCP project.
Open the hosted web app. No install needed.
π app.mcpjam.com
Or run MCPJam locally for HTTP/S and local STDIO servers:
npx @mcpjam/inspector@latest
MCPJam Inspector runs three ways: a hosted web app, a desktop app for Mac and Windows, or via your terminal. The web app is HTTPS-only and has no install. Terminal and Desktop support HTTP/S and local STDIO servers.
Node.js 20+ is only required for the terminal install (npx). The hosted web app and desktop apps have no local runtime requirements.
Open app.mcpjam.com in your browser. No install required. Always on the latest version, and you can share MCP server links with teammates the same way you'd share a Google Doc.
See Hosted App docs for details.
Download the installer for your OS. Supports HTTP/S and local STDIO servers. No Node.js required.
Run the inspector via npx (supports HTTP/S and local STDIO):
npx @mcpjam/inspector@latest
After it starts, open the printed localhost URL in your browser.
Run MCPJam Inspector using Docker, bound to localhost for security:
docker run -p 127.0.0.1:6274:6274 mcpjam/mcp-inspector
The app is available at http://127.0.0.1:6274. Always use -p 127.0.0.1:6274:6274 (not -p 6274:6274) to keep the inspector local-only. On macOS/Windows, connect to host MCP servers via http://host.docker.internal:PORT instead of 127.0.0.1.
| Capability | Description |
|---|---|
| App Builder | Debug your server against a model: tool calls or in-panel chat, with Chat, Trace, and Raw. OpenAI Apps SDK and MCP app UIs, text tools, Chrome DevTools-style widget emulator. Read more |
| Chat | Multi-server chat on frontier models (free). Chat, Trace, Raw; compare up to 3 models. Read more |
| OAuth Debugger | Guided MCP OAuth conformance checks: protocol versions 03-26, 06-18, 11-25; DCR, client pre-registration, CIMD. Read more |
| MCP Server Debugging | Manually run tools, resources, templates, and elicitation; full JSON-RPC logs. |
| Skills | Skills in Chat and App Builder; local filesystem only. Read more |
| Workspaces | Shared server groups with real-time team sync. Read more |
| Evals | Test cases with expected tool calls, run across LLMs, metrics. Read more |
| CLI | Run MCPJam checks, probes, and evals from the terminal. Perfect for local dev loops and CI. Read more |
| SDK | Programmatic access to MCPJam for custom tooling, scripting, and integrations. Read more |
Debug your server against a model using tool calls or in-panel chat, with Chat, Trace, and Raw views. Supports OpenAI Apps SDK and MCP app UIs, text tools, and a Chrome DevTools-style widget emulator to iterate on widgets locally.
window.openai messages in the logs.Trace view: every tool call, agent step, and JSON-RPC message.
Multi-server chat on frontier models for free, or bring your own API key. Chat, Trace, and Raw views; compare up to 3 models side-by-side. View your server's token usage.
Guided MCP OAuth conformance checks with step-by-step explanations. Test against every version of the OAuth spec (03-26, 06-18, and 11-25). Support for client pre-registration, Dynamic Client Registration (DCR), and Client ID Metadata Documents (CIMD).
MCPJam contains all of the tooling to test your MCP server. Manually run tools, resources, resource templates, prompts, and elicitation flows, with full JSON-RPC observability. MCPJam has all features from the original inspector and more.
Use Skills in Chat and App Builder to extend models with local, reusable behaviors. Local filesystem only. Your data never leaves your machine. Read more
Group your servers into shared workspaces with real-time team sync, so everyone on your team is testing against the same configuration. Read more
Define test cases with expected tool calls and run them across multiple LLMs. Track accuracy metrics over time to catch regressions early and improve your server with every iteration. Read more
Run MCPJam from the terminal for fast local dev loops and CI integration. Probe servers, run OAuth checks, inspect tools and resources, and execute evals without leaving your shell. Read more
Programmatic access to MCPJam for custom tooling, scripting, and integrations. Build your own workflows on top of MCPJam's inspection and evaluation primitives. Read more
Wire MCPJam into GitHub Actions, GitLab CI, or your CI system of choice to run conformance, E2E tests, and evals on every PR. Catch MCP server regressions before they ship. Read more
We're grateful for you considering contributing to MCPJam. Please read our contributing guide.
Join our Discord community where the contributors hang out at.
Some of our partners and favorite frameworks:
This project is licensed under the Apache License 2.0. See the LICENSE.
| CI/CD | Run MCPJam checks and evals in GitHub Actions and other CI systems to gate PRs on regressions. Read more |