Debug, test, and monitor Model Context Protocol (MCP) servers. Inspect every tool, resource, and prompt live, trace JSON-RPC calls, build regression test suites, run them in CI/CD, and share sessions with your team β free to start.
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Maker
π
π Hey Product Hunt!
I built Bubble MCP because debugging Model Context Protocol servers meant a lot of console.log guesswork and manually re-clicking through tools every time something broke.
What it does:
π Inspector β browse every tool, resource, and prompt your MCP server exposes, and call any of them live with a schema-aware JSON editor
π‘ Trace β full JSON-RPC request/response logging in real time, with diffing so you can see exactly what changed between two calls
β Test Suites β turn what you find into real regression tests: define inputs, expected outputs, and assertions, then run the whole suite in one click
π CI/CD β generate an API key, drop one workflow file into your repo, and your MCP tests run automatically on every push (fails the build on regressions)
π₯ Team Collaboration β shared sessions and test suites, so whoever's on call can pick up exactly where a teammate left off β no exporting JSON over Slack
π Performance Analytics β p50/p95/p99 latency per tool, with side-by-side session comparison to catch regressions
π Monitoring & Alerts β we reconnect to your server hourly and alert you the moment a tool or schema changes
ποΈ MCP Directory β a searchable public catalog of community MCP servers you can load as a starting point
No install needed β paste your server URL and start inspecting in seconds. Desktop apps also available for Mac and Windows.
It's free to start. Would love your feedback β especially if you're building MCP servers for Claude or other agents. We also run a bug bounty ($50 for accepted bugs) if you want to help us harden it: bubblemcp.com/bugs
Happy to answer any questions in the comments! π
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finally a tool that makes MCP debugging actually visible, the live JSON-RPC trace helped me catch a malformed response in seconds that i would have chased for hours
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Maker
Thank you @rdvantunzwcz1Β ! This made our day π . Malformed responses are sneaky exactly because they hide in the noise β glad the live trace pulled it out for you fast. Appreciate you giving it a shot!
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finally a clean way to trace json-rpc calls without wading through logs. caught a stale prompt config in our test server within five minutes of poking around.
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Maker
Thank you @kazmicu7Β ! Really glad to hear it! Stale config issues are the worst kind β everything "looks" fine until you actually see the live calls. Five minutes to catch it is exactly the workflow we were going for. Thanks for giving it a spin!
finally a tool that makes MCP debugging actually visible, the live JSON-RPC trace helped me catch a malformed response in seconds that i would have chased for hours
Thank you @rdvantunzwcz1Β ! This made our day π . Malformed responses are sneaky exactly because they hide in the noise β glad the live trace pulled it out for you fast. Appreciate you giving it a shot!
finally a clean way to trace json-rpc calls without wading through logs. caught a stale prompt config in our test server within five minutes of poking around.
Thank you @kazmicu7Β ! Really glad to hear it! Stale config issues are the worst kind β everything "looks" fine until you actually see the live calls. Five minutes to catch it is exactly the workflow we were going for. Thanks for giving it a spin!