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 (12-18 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) and lacks production-grade polish. Baseline: A+ tools average 194 chars for descriptions and 72 chars per param; this server is 1/8th that depth.

• Expand tool description to 100 - 200 chars: 'Adds two numbers together and returns the sum. Use this for arithmetic operations. Accepts integers and floats. Returns a single numeric result.'
• Document output schema in tool metadata or description: 'Returns an object with a single field: result (number), the sum of a and b.'
• Add range constraints to parameters: 'a (number, -1e308 to 1e308): First number to add. Supports integers and floats.'
• Add error handling guidance: 'If inputs are non-numeric, returns an error. Ensure both a and b are valid numbers before calling.'
• Consider adding a second tool (e.g., multiply, divide) to demonstrate composition and tool chaining patterns.