Two tools with minimal descriptions and basic schemas. 'add' (9 chars) and 'calculate' (10 chars) descriptions are far below the 50-200 char baseline for LLM-optimized tools. Both tools lack parameter descriptions entirely, critical gap per pattern:tool-description. Schemas are present but sparse. No error handling guidance, no output schema documentation, no composition hints. Tools are simple arithmetic operations with no real-world complexity, but even simple tools need proper documentation for agent selection and error recovery.

• Expand 'add' description to ~80 chars: 'Adds two numbers and returns the sum. Use when you need basic arithmetic addition without operation selection.'
• Expand 'calculate' description to ~120 chars: 'Performs arithmetic operations (add, subtract, multiply, divide) on two operands. Use when you need flexible operation selection. Returns numeric result or error for division by zero.'
• Add parameter descriptions: a='First operand (number)', b='Second operand (number)', operation='Arithmetic operation to perform (add, subtract, multiply, divide)'
• Document output schema: both tools return {result: number} or {error: string}. Specify which fields are always present.
• Add error handling: return structured error objects {error: 'DIVISION_BY_ZERO', message: 'Cannot divide by zero', retryable: false} instead of plain text.