Single tool 'add' has a clear verb-noun name and basic schema with typed parameters. However, the description is extremely minimal (22 chars), barely meeting the 10-char floor. Parameter descriptions are present but terse (12-13 chars each). No output schema is documented, the response structure is inferred from code but not declared in tool metadata. No error handling guidance, no idempotency hints, no composition context. The tool is trivial (arithmetic), so complexity is low, but the definition lacks the rigor expected of production tools. Baseline: 194 chars avg description, 72 chars avg param annotation, this server is 1/9th the expected description length.

• Expand tool description to 50 - 150 chars: 'Adds two numbers and returns the sum. Use this for arithmetic operations. Returns a text response with the numeric result.'
• Document the output schema explicitly in tool metadata or comments: 'Returns {content: [{type: "text", text: string}]} where text is the sum as a string.'
• Enhance parameter descriptions: 'a: A numeric value (integer or float). b: A numeric value (integer or float). Both must be finite numbers.'
• Add error handling guidance: 'If inputs are non-numeric or infinite, the tool will return an error. Ensure inputs are valid numbers before calling.'
• Consider adding a 'precision' or 'round_to' optional parameter if floating-point rounding is a concern, with clear documentation of default behavior.