Flask MCP Server implements a single tool 'sum' with basic but incomplete definition quality. The tool has a clear, action-oriented name ('sum') and a concise description ('Sum two integers'). Input parameters are properly typed (both integers) with brief descriptions ('First number', 'Second number'). However, the definition lacks critical elements: no documented output schema, no error handling guidance, no parameter constraints or ranges, and descriptions are extremely minimal (17 and 13 characters respectively, below the 34-character p10 baseline). The server itself demonstrates good production-readiness patterns (authentication, rate limiting, validation) but the tool definitions are sparse. With only one tool, the overall definition quality is held back by missing schema documentation and minimal parameter descriptions.

• Expand tool description to 50-200 characters. Example: 'Sum two integers and return their total. Returns an integer result. Call this tool to perform basic arithmetic operations.'
• Enhance parameter descriptions to match the 72-character baseline. Example: a → 'First integer operand. Must be a valid 32-bit integer (-2^31 to 2^31-1).', b → 'Second integer operand. Must be a valid 32-bit integer (-2^31 to 2^31-1).'
• Document the output schema in the tool definition. Specify that the result is an integer representing a + b.
• Add error guidance in the tool description or schema: 'Returns an error if the sum exceeds integer range (overflow/underflow).'
• Consider adding input validation constraints (min/max values) to the schema to guide LLM input generation and prevent out-of-range values.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry