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 but well below the 50-200 char LLM-optimized range (baseline avg 194 chars). Parameter descriptions are present but terse (9-10 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), so some gaps are forgivable, but a production server should model better practices even for simple tools.

• Expand tool description to 80-150 chars: 'Adds two numbers and returns the sum. Use this for arithmetic operations. Returns a text result containing the numeric sum.'
• Add format hints to parameters: a: 'A number (integer or decimal, no limit)' and b: 'A number (integer or decimal, no limit)', or specify range if bounded.
• Document output schema in tool metadata: { type: 'object', properties: { result: { type: 'number', description: 'The sum of a and b' } } }
• Add error handling guidance: 'Returns an error if inputs are not numbers. Handles overflow gracefully (returns Infinity for very large sums).'
• Declare tool as read-only and idempotent in metadata (readOnlyHint: true, idempotentHint: true) to signal safety to agents.