Enter an MCP protocol version to see whether it matches the current 2026-07-28 specification or an older known release.
The current specification is 2026-07-28. Older versions may use materially different lifecycle, handshake, transport and capability behavior, so version-aware debugging matters.
Check whether an MCP protocol version is current, older or unknown and view migration notes.
Use MCP Protocol Version Checker as a focused pre-flight utility while building, reviewing or debugging an MCP integration. Paste the relevant configuration, protocol message, metadata, schema or value into the tool and review the returned findings before the same data reaches a production client or server.
Protocol checks are especially useful when debugging interoperability between different MCP clients, servers, gateways and SDK versions. The tool analyzes the data you provide and does not initiate a live MCP exchange.
A clean result means the input passed the rules implemented by this utility. It does not guarantee application security, protocol interoperability or correct business behavior. Test important integrations against the exact MCP client, SDK, gateway and server versions used in your deployment.
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