Seven basic arithmetic tools with consistent naming (verb_noun pattern: add, subtract, multiply, divide, power, sqrt, factorial) and present descriptions. All tools have input schemas with typed parameters and descriptions. However, descriptions are minimal (10-60 chars, below the 50-200 char baseline for LLM optimization), lack usage guidance, and omit error recovery hints. No output schemas documented. Error handling exists (divide-by-zero, negative factorial) but error messages are generic. Tools are well-composed (single responsibility) and idempotent. Missing: pagination (not applicable), permission gates, audit trails, and rate limiting (appropriate for a calculator but worth noting). Parameter descriptions are adequate but terse.

• Expand descriptions to 50-150 chars with WHEN guidance. E.g., 'Divide first number by second. Use for ratios, scaling, or splitting values. Denominator must be non-zero.'
• Document output schemas in tool docstrings. E.g., '@mcp.tool() returns float: The quotient of a/b.'
• Add input validation to sqrt() and factorial() with clear error messages: 'Input must be non-negative.'
• Enhance error messages with recovery hints. E.g., divide-by-zero: 'Cannot divide by zero. Ensure the denominator is non-zero and try again.'
• Add tool annotations via FastMCP metadata (if supported) to declare read-only and idempotent hints for agent optimization.