Measure MCP tool schema complexity and flag deeply nested, oversized or externally referenced schemas that deserve additional review.
MCP 2026-07-28 supports full JSON Schema 2020-12 for tool schemas. Implementations should still bound schema depth and validation work so complex or hostile schemas cannot consume unbounded resources.
Analyze MCP JSON Schema depth, nodes, properties, composition branches and external references.
Use MCP Schema Complexity 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.
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.