This MCP server has severe definition quality issues. Both tools have minimal descriptions (7-42 chars, well below the 10-1024 baseline), and critically, all parameter descriptions are null/missing. The tool names are generic and lack action verbs. No error handling guidance is evident in the code, and the divide-by-zero case in 'calculate' returns plain text rather than a structured error response. The server does not implement any of the 54 Agentic Tool Patterns.

• Add explicit parameter descriptions for all inputs. Example for 'add': 'a' -> 'First number to add (any finite number)', 'b' -> 'Second number to add (any finite number)'.
• Expand tool descriptions to 50-200 characters, answering what the tool does and when to use it. Example: 'add: Adds two numbers and returns the sum. Use for simple arithmetic. Returns a numeric result.' (instead of 'Simple addition tool')
• Rename 'add' to 'sum_numbers' and 'calculate' to 'perform_arithmetic' to match verb_noun convention and reduce ambiguity.
• Document output schemas explicitly. Define that both tools return { type: 'text', text: string } and specify the format of returned numbers (e.g., 'string representation of the result as a decimal number').
• Add structured error handling for the divide-by-zero case: return a structured error object with error_code, message, and recovery hint, e.g., { error_code: 'division_by_zero', message: 'Cannot divide by zero.', suggestion: 'Try different operand values.' }
• Add parameter constraints in descriptions. For 'a' and 'b': 'Must be a finite number. Range depends on platform floating-point limits.' For 'operation': 'Must be one of: add, subtract, multiply, divide.'
• Implement error classification. Distinguish between invalid input (user-fixable: bad operation enum) and runtime errors (divide by zero). Return appropriate guidance for each.
• Consider adding a third tool 'validate_calculation' that explains what each operation does before execution, supporting a confirmation pattern for operations users might find ambiguous.