Product / UX / Agent tools & protocols

MCP Inspector

Developer tool for testing and debugging MCP servers, with a React web UI and a CLI mode. Includes a Node proxy supporting stdio/SSE/Streamable-HTTP, request history and live visualization, bearer-token auth, multi-server config, and DNS-rebinding protection.

MIT. ~10k stars, ~847k npm downloads/last-30-days.

Openness

5 high confidence

5.0

license: MIT(OSI)
source: public
core-gated: ungated

Fully MIT.

https://github.com/modelcontextprotocol/inspector recorded 2026-06-17
MIT license file

Adoption

4 high confidence

4.0

~847k npm downloads in the last 30 days.

https://www.npmjs.com/package/@modelcontextprotocol/inspector recorded 2026-06-17
~847k downloads/last-30-days

Capability

4 high confidence

4.0

Best-in-class for its debugging niche; narrower scope than the SDKs by design.

https://github.com/modelcontextprotocol/inspector recorded 2026-06-17
feature set: web UI + CLI debugging, all transports

Unchanged since 2026-07-30 (last edited, not re-checked)