The 'calculate' tool has a clear name, adequate description, and properly typed input schema with enum constraint. However, it is a demonstration/example tool with minimal real-world complexity. The schema is well-formed but the tool itself lacks depth: no output schema documentation, no error handling guidance, no discussion of edge cases (division by zero), and no parameter constraints beyond enum. The description is functional but brief (48 chars), leaving room for LLM optimization. The schema includes all required fields with types and descriptions, meeting basic quality thresholds. Overall, this is a competent but minimal implementation, adequate for a tutorial but lacking production rigor.

• Expand tool description to 50-200 characters, explaining WHEN to use calculate (e.g., 'Performs basic arithmetic operations: add, subtract, multiply, divide. Use for simple math queries. Returns result as a number.')
• Document the output schema in the tool description or add a structured return type specification: 'Returns { result: number, operation: string, a: number, b: number }'
• Add constraints to numeric parameters: 'a' and 'b' should specify min/max bounds (e.g., -1e6 to 1e6) to prevent absurd values
• Add error handling note to description: 'Division by zero returns an error. Suggest using a different operation or adjusting the divisor.'
• Consider adding an idempotentHint or readOnlyHint annotation if using MCP 2026-07-28+ toolAnnotations feature, since calculate has no side effects