Single-tool server with solid naming and schema definition but moderate description gaps. The 'calculate' tool follows verb_noun naming (calculate) and includes a complete JSON Schema with typed parameters, enums, and required constraints. However, descriptions lack sufficient detail for LLM optimization, particularly the tool description (34 chars) falls below the 50-200 char production baseline, and parameter descriptions are minimal. Error handling is present (divide-by-zero check) but lacks actionable recovery guidance. Output schema is implicit (text format response) rather than explicitly documented. No parameter dependency documentation despite operation controlling field validity.

• Expand tool description to 80 - 150 characters: 'Perform arithmetic operations (add, subtract, multiply, divide) on two numbers. Returns the result rounded to 2 decimal places. Use for mathematical calculations in multi-step workflows.'
• Document output schema explicitly in server metadata or tool description: 'Returns: {result: string formatted as '##.##' (e.g., '42.00')}'. Add examples: calculate(operation='add', x=5, y=3) → '8.00'.
• Improve error message for divide-by-zero: 'Cannot divide by zero. Verify the divisor (y) is non-zero. Try divide(x=10, y=2) instead, or use a different operation.'
• Fix operation parameter description: 'The arithmetic operation to perform: add, subtract, multiply, or divide (required; case-sensitive).'
• Add numeric bounds to x and y parameter descriptions if applicable: 'First number (required; range: -1e308 to 1e308 for IEEE 754 floats).' This prevents LLM hallucinations of extreme values.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry