Two tools with basic schemas and minimal descriptions. Both tools have input schemas with proper types (number, string enum), but descriptions are extremely short (10-40 chars), falling well below the 50-200 char baseline for LLM-optimized descriptions. No output schema documentation. Error handling exists (divide-by-zero check) but lacks recovery guidance. Tool names are action-oriented (add, calculate) but descriptions provide almost no context for when to use each tool or what distinguishes them.

• Expand tool descriptions to 50-150 chars. Example for 'add': 'Adds two numbers and returns the sum. Use this for simple two-operand addition. For multiple operations (subtract, multiply, divide), use calculate() instead.'
• Document output schema: both tools return {type: 'text', text: string} containing the numeric result. Specify if result is always a number or could be an error message.
• Remove the 'add' tool or clearly differentiate it. If keeping both, add to 'add' description: 'Optimized for simple addition only. For mixed operations, use calculate().'
• Enhance error messages with recovery guidance. Change divide-by-zero error to: 'Cannot divide by zero. Provide a non-zero divisor (b parameter must not be 0).'
• Add parameter constraints to descriptions. Example: 'a: First number (supports integers and decimals, e.g., 3.14 or -42)' and 'operation: Arithmetic operation to perform (one of: add, subtract, multiply, divide)'.