Single tool 'add' has a clear verb-noun name and basic schema with typed parameters. However, the description is minimal (22 chars) and lacks context about when/why to use it. Parameters 'a' and 'b' have type definitions and brief descriptions, meeting baseline requirements. No output schema is documented. The tool is trivial (arithmetic) and does not reflect production patterns like error handling, idempotency hints, or recovery guidance. Zod schema is present but output structure is not formally documented for the LLM.

• Expand tool description to 50-150 chars: 'Adds two numbers and returns the sum. Use for arithmetic operations. Returns a text representation of the result.'
• Document output schema in description or as a formal response type: 'Returns {content: [{type: "text", text: string}]} where text is the numeric sum as a string.'
• Add parameter constraints: describe valid ranges (e.g., 'a: number, any finite value including negative and decimal') and edge case handling.
• Add tool annotations to the schema: set readOnlyHint=true and idempotentHint=true to signal safety properties to the LLM.
• Include error guidance: 'If inputs are non-numeric or Infinity, the tool returns an error. Ensure both a and b are valid numbers.'