Single tool 'add' has a clear verb-noun name and basic schema with typed parameters. However, the description is extremely minimal (23 chars), barely meeting the 10-char floor. Parameter descriptions are present but terse (18-19 chars each). No output schema is documented, the response structure is inferred from code only. 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 for production use. Baseline: 194 chars avg description, 72 chars avg param annotation. This server falls well below those standards.

• Expand tool description to 80 - 150 chars: 'Adds two numbers and returns the sum. Use this for arithmetic operations. Returns a text response with the numeric result.'
• Document output schema explicitly: 'Returns {content: [{type: "text", text: string}]} where text is the numeric sum as a string.'
• Enhance parameter descriptions: 'a (number): First operand. Must be a finite number; NaN and Infinity are rejected.' Similar for b.
• Add error handling guidance: 'If inputs are non-numeric, returns error "Invalid input: a and b must be numbers". Retry with valid numeric values.'
• Consider adding a 'precision' or 'decimal_places' parameter if floating-point rounding is a concern, with explicit constraints.