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 but not declared in tool metadata. No error handling guidance, no idempotency hints, no composition context. The tool is trivial (arithmetic) and lacks production-grade polish expected of agent tools.

• Expand tool description to 80 - 150 characters: 'Adds two numbers together and returns the sum. Use this for arithmetic calculations. Returns a text representation of the result.'
• Document the output schema explicitly in tool metadata or comments: 'Returns {content: [{type: "text", text: string}]} where text is the numeric sum as a string.'
• Add parameter constraints to descriptions: 'First number to add (any finite number, including decimals and negatives)' and 'Second number to add (any finite number, including decimals and negatives)'.
• Add error handling guidance: 'If inputs are non-numeric or Infinity, the tool will return an error. Ensure inputs are valid numbers before calling.'
• Consider adding a second tool (e.g., 'multiply', 'divide', 'subtract') to demonstrate tool composition and chaining patterns, or remove this demo tool and replace with a realistic example.