Built an open-source WebMCP Inspector - would love your feedback

[Shitij Agrawal]

Hi everyone,

I wanted to share something I’ve been building: an open-source Chrome extension called WebMCP Inspector.

Repo: https://github.com/mr-shitij/webmcp_inspector

I made it because while experimenting with WebMCP, I kept wanting better tooling to quickly see available tools, inspect schemas, run tools manually, and debug failures without a lot of setup.

Right now it supports:

tool discovery + inspection
manual execution/testing
AI-assisted tool flows
provider support (Gemini, OpenAI, Anthropic, Ollama)
It’s still evolving, and I’d genuinely appreciate feedback from people building in this space:

What’s missing?
What breaks in your workflows?
What would make this actually useful day to day?
If anyone wants to try it and share thoughts (or contribute), I’d be super grateful.

Thanks a lot.

[François Beaufort]

Pretty cool!

Small nits when testing with https://googlechromelabs.github.io/webmcp-tools/demos/french-bistro/,:
-  I clicked "Execute Tool" button and got "Execution failed: UnknownError: Failed to parse input string as JSON".  Is this expected?
-  It says "No declarative tools found" even though it is a declarative tool.

[Shitij Agrawal]

Thanks for using it!

I’ve fixed the bug. Could you please try again after running a git pull?

Thanks again.

[François Beaufort]

It works great now!!

[Shitij Agrawal]

Thanks for checking that out.
It has finally been published: https://chromewebstore.google.com/detail/edfjnadfiapmddgplgnphlflgafmcino?utm_source=item-share-cb
Currently, this is the old version. Within a few days, v3 will be available with all the fixes.

[Shitij Agrawal]

Hi everyone,

Just a quick update — V3 of WebMCP Inspector is now live on the Chrome Web Store 🎉
This version includes the fixes and improvements discussed earlier.
Feel free to try it out and let me know your feedback!