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 descriptions but are generic. No output schema is documented. No error handling guidance. The tool is trivial (arithmetic) and does not reflect production patterns for composition, chaining, or recovery.

• Expand tool description to 80-150 chars: 'Adds two numbers and returns the sum. Use this for arithmetic operations. Both inputs must be finite numbers (no NaN or Infinity). Returns {result: number}.'
• Document output schema explicitly in code and description: 'Returns {result: number, input_a: number, input_b: number}' to enable chaining.
• Add input validation with actionable errors: catch non-numeric inputs and return 'Invalid input: a must be a number, got <type>. Example: a=5, b=3.'
• Add parameter constraints to descriptions: 'First number to add (finite number, range: -1e308 to 1e308)' and same for b.
• If this is a demo, add a second tool (e.g., multiply, subtract) to demonstrate tool composition and chaining patterns.