This is a minimal calculator server with serious quality gaps across naming, descriptions, and parameter documentation. All four tools (add, subtract, multiply, divide) are functionally simple but lack the rigor expected of production-grade MCP servers. Tool names are simple verbs but provide no context about what domain they operate in. Descriptions are present but extremely terse (10-26 characters), well below the 50-200 character baseline for LLM-optimized descriptions. Parameters have type definitions (int) but completely lack descriptions, the rubric requires every parameter to have a description explaining what it controls. The divide tool has basic error handling (zero-check) but returns a raw ValueError rather than a structured, actionable error message. No output schemas are documented. The server is mathematically correct but fails to meet agent-grade tool definition standards.

• Add explicit parameter descriptions for all tools. Example: 'num1: The first operand (integer). Can be positive, negative, or zero.' and 'num2: The second operand (integer). For divide, must be non-zero.'
• Expand tool descriptions to 80-150 characters. Example for add: 'Adds two integers and returns the sum. Use this when you need to combine numeric values or accumulate totals.'
• Document output schemas explicitly. Example: 'Returns: int - the numeric result of the operation.'
• Refactor divide() error handling to return a structured error: instead of raising ValueError, return {'error': 'num2 must be non-zero', 'recovery': 'Please provide a non-zero divisor.'}
• Consider renaming tools to avoid collisions: 'math_add', 'math_subtract', 'math_multiply', 'math_divide', signaling they are calculator domain tools.
• Add parameter constraints to descriptions: 'num1 and num2 must be integers. num2 in divide() must not be zero.' Document acceptable ranges if any.