Compare an MCP request and response to detect mismatched IDs, malformed JSON-RPC versions and invalid result/error combinations.
JSON-RPC responses must correspond to the correct request ID. This checker catches ID mismatches and common response-envelope mistakes.
Check whether an MCP JSON-RPC response matches its originating request ID and message structure.
Use MCP Request / Response Matcher 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.