MCP server tester
Test and health-check your MCP server
A safe, browser-direct probe for HTTPS Streamable HTTP MCP endpoints. It negotiates, inspects, and reports without executing tools or reading content.
Browser-direct probe
Enter an MCP endpoint
Only HTTPS endpoints are accepted. Local, private IP, link-local, metadata, credential-bearing, and non-HTTP targets are rejected.
Privacy warning for custom headers
Use a short-lived test credential only. Headers stay in memory for this run, are sent directly by your browser, then cleared. They are never persisted or included in the report.
No tools are executed. Resources and prompts are catalogued only. The tester never calls resources/read or prompts/get.
Live progress
Read-only inspection timeline
- 1Validate endpoint and headers
- 2Negotiate MCP protocol
- 3Confirm initialized session
- 4Discover tools catalog
- 5Discover resources catalog when advertised
- 6Discover prompts catalog when advertised
- 7Assemble bounded health report
Safety boundary: browser-direct HTTPS only, with bounded response bodies, JSON, timeline events, pagination, and total duration.