Single tool 'add' has a clear verb-noun name and basic schema with typed parameters. However, the description is extremely minimal (23 chars), barely meeting the 10-char floor. Parameter descriptions are present but terse (12-18 chars each). No output schema is documented, the response structure is inferred from code but not declared in tool metadata. No error handling guidance, no idempotency hints, no composition context. The tool is trivial (arithmetic) and does not reflect production patterns like pagination, structured output documentation, or recovery guidance.

• Expand tool description to 50-150 chars: 'Adds two numbers together and returns the sum. Accepts integers and floats. Use for arithmetic calculations in workflows.'
• Document output schema explicitly: declare that the tool returns {content: [{type: 'text', text: string}]} so the LLM knows what to expect.
• Add parameter constraints: 'First number to add (integer or float, range -1e10 to 1e10)' and 'Second number to add (integer or float, range -1e10 to 1e10)'.
• Add error handling guidance: 'Returns error if inputs are non-numeric or exceed safe integer bounds. LLM should validate inputs before calling.'
• Consider adding a batch variant (add_multiple) if this server will support multi-operand arithmetic, enabling composition without sequential calls.