Single tool 'add' has a clear, concise description (27 chars) and properly typed input schema with Zod validation. However, the description is below the 50-char baseline for production tools and lacks context about when/why to use it. No output schema is documented, LLMs cannot predict the response structure. Parameter descriptions are minimal (12-13 chars each), below the 72-char baseline. No error handling guidance, no examples of edge cases (e.g., very large numbers, non-numeric input). The tool is READ_ONLY but lacks explicit idempotent/readonly annotations in the MCP schema. Overall, this is a minimal proof-of-concept tool, not production-grade.

• Expand tool description to 80 - 150 chars: 'Adds two numbers and returns their sum. Use this for arithmetic operations. Supports integers and decimals; results are IEEE 754 floats.'
• 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 valid JavaScript number (−2^53 to 2^53). Decimals allowed.' Similar for 'b'.
• Add error handling: 'If inputs are non-numeric or Infinity, returns error: "Invalid input: a and b must be finite numbers."'
• Add readOnlyHint annotation to the tool schema to signal to clients that this tool is safe to call without confirmation.