Single tool 'add' has a clear verb-noun name and basic schema with typed parameters (number, number). However, the description is extremely minimal (11 chars: 'Adds two numbers together'), falling below the 20-char threshold and providing no context on when/why to use it. No output schema is documented. No error handling guidance. The tool is trivial and does not reflect production patterns for parameter validation, error recovery, or composition.

• Expand tool description to 50 - 150 chars: 'Adds two numbers and returns the sum. Use this for arithmetic operations. Returns a text result containing the numeric sum.'
• Document the output schema explicitly: 'Returns an object with a single field: result (number), the sum of a and b.'
• Add parameter constraints: 'a (number, required): First operand. Must be a valid JSON number.' Similarly for b.
• Add error handling: 'If inputs are not numbers, returns an error: "Invalid input: a and b must be numbers."'
• If this is a demo, add a second tool (e.g., multiply, subtract) to demonstrate tool composition and chaining patterns.