Test your stdio and remote mcp servers against to latest MCP specs. Generate conformance report for MCP servers, fix and repeat.
A black-box conformance suite for any MCP server. It speaks the protocol over the wire and nothing else — no plugin, no instrumentation, no knowledge of the implementation — so the same suite runs against a local process, a staging deployment or somebody else's hosted endpoint without modification.
It supports the two most recent spec revisions only — currently 2026-07-28 and 2025-11-25 — and always tracks the newest one. Anything older is reported as out of scope rather than judged. See Supported revisions.
It reports what the server does, where it deviates from the spec, and — as its own section — what could not be checked:
Requirements this revision does not have are not reported
A case that does not run means one of two things, and only one of them is worth a reader's attention:
- NOT VERIFIED — the requirement applies to this target, but the run could not establish it: a capability was not advertised, a call needed arguments the suite will not invent, a stream never opened. This is the list to work through before claiming conformance, which is why it is printed above the passes. - Not applicable — the revision under test does not define the thing, or the transport has no such requirement. initialize is not a gap in a 2026-07-28 run; that revision replaced the handshake with server/discover. These are omitted entirely — not listed, not counted. A requirement the spec does not define is not a result, and showing it only invites the question of why the suite is testing something the spec does not have.
From the project README.
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