Inspect MCP tool execution results for malformed content, error flags, structured output and modern resultType values.
In MCP 2026-07-28 structuredContent may contain any JSON value rather than only a JSON object. Tool-level execution failures use isError, while modern result types can also support multi-round or extension-specific flows.
Validate MCP tool result content, isError, resultType, structuredContent and multi-round result structure.
Use MCP Tool Result Validator 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.
This validator is useful before configuration is committed, shared with another client or moved into production. Structural validation catches many integration problems early, but runtime behavior should still be tested with the exact client and server implementation you use.
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.