Check MCP tool input and output schemas for malformed types, required fields, properties, arrays and common JSON Schema structural mistakes.
MCP tools describe expected arguments using JSON Schema structures. Clear schemas help clients understand required fields, data types and expected structure.
This validator checks common structural mistakes but is intentionally not presented as a complete validator for every JSON Schema draft keyword.
Validate MCP tool inputSchema and outputSchema structures, required properties, JSON Schema types, arrays, properties and schema composition.
Use MCP Schema 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.