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 but not declared in tool metadata. No error handling guidance, no pagination, no composition hints. 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 is 1/8th the expected description length.

• Expand tool description to 100 - 200 chars: 'Adds two numbers together 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: { type: 'object', properties: { result: { type: 'number', description: 'The sum of a and b' } } }
• Add range constraints to parameters: 'a: number (range: -1e308 to 1e308)', 'b: number (range: -1e308 to 1e308)'
• Add error handling: catch non-numeric inputs and return 'Invalid input: a and b must be numbers. Got a={a}, b={b}.'
• If this tool is a demo, consider adding a second tool (e.g., 'multiply', 'divide') to demonstrate composition and tool chaining patterns.