Single tool 'add' has a basic schema with typed parameters (a, b as numbers) and descriptions, but falls short of production quality. No output schema documented. No error handling guidance. Tool is trivial (arithmetic) and lacks real-world complexity, but the definition pattern is weak: description should explain WHEN to use this tool, what it returns, and any edge cases. Parameter descriptions are present but generic. No pagination, no idempotent hints, no recovery guidance.

• Expand tool description to 50 - 150 characters: 'Adds two numbers and returns their sum. Use this for arithmetic calculations. Returns a single numeric result or an error if inputs are invalid or overflow.'
• Document output schema explicitly: 'Returns {result: number}' or similar. Include in tool metadata or response documentation.
• Add parameter constraints: 'a (number, range: -1e308 to 1e308): First operand' and 'b (number, range: -1e308 to 1e308): Second operand'.
• Add error handling guidance: 'If inputs are not numbers, returns error with message. If result overflows, returns overflow error. Retry with smaller values.'
• Consider renaming to 'add_numbers' for clarity and consistency with verb_noun pattern (baseline: 90% of A+ tools start with action verb).