The conformance check for the MCP ecosystem
Audit any MCP server.
Paste a server URL. MCProbe lints its tool schemas, behaviorally tests them with broken inputs to catch silent failures and returns a 0–100 conformance score with the exact fixes.
2 free audits a day · no card required · $9.90 once for 30/day
example-mcp-server
fuzzed 4 of 4 tools
⚠ 4 tools silently accept malformed input
Static linters tell you a schema looks fine.
MCProbe tells you the server actually behaves.
Lint the schemas
12 agent-usability rules: missing descriptions, untyped params, missing annotations and more — the things that make a tool hard for an AI to call correctly.
Fuzz the tools
It calls each tool with missing, wrong-typed and out-of-enum inputs and catches the ones that silently accept garbage instead of erroring — the failure static checks can't see.
Score & prescribe
A 0–100 conformance score across four dimensions, an A–F grade and a prioritized to-do list of exactly what to fix.
How it works
- 1
Paste a URL
Point MCProbe at any MCP server reachable over HTTP. No install, no setup on the server side.
- 2
It runs the audit
A read-only static audit by default; opt in to behavioral fuzzing to test how the server handles bad input.
- 3
Get a graded report
Score, grade, the findings and a fix list — yours to act on or to share.
Ship MCP servers agents can actually use.
Know your score before you publish — and before an agent finds the gaps for you.
Open App