Single tool 'validate' with clear naming, well-structured schema, and comprehensive parameter documentation. The tool follows verb_noun naming (validate), has a descriptive 167-character description explaining WHAT (validate artifacts against contracts), WHEN (via machinegrade API), and HOW (three validator types). Input schema properly declares types and required fields. However, output schema is undocumented, callers cannot predict what the API returns without examining the actual backend. No explicit error handling guidance or recovery hints. The server is STDIO-only, which caps protocol readiness severely but does not penalize definition quality itself.

• Add explicit output schema documentation to the validate tool. Example: 'Returns { valid: boolean, errors?: ConstraintViolation[], hints?: string[] } where ConstraintViolation is { path: string, message: string, constraint: string }.'
• Enhance error responses with recovery guidance. Instead of 'HTTP 400: {raw error}', return structured error with category and next step: '{ isError: true, content: [{ type: "text", text: "Invalid schema: property 'id' must have type. Try: { ... schema with proper types ... }" }] }'.
• Expand contract parameter description with per-validator documentation: 'json_schema: { schema: JSONSchema object }. openapi_response: { spec: OpenAPI 3.0+ object, path: string, method: string, status: number }. sql: { dialect: "postgres"|"mysql"|"sqlite" }'.
• Document any result size limits or streaming behavior. If validation errors can be large, specify max error count returned or pagination strategy.