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 50-200 chars. Example: 'add: Performs simple addition of two numbers. Use when you need a basic arithmetic operation without selecting a specific operation type. Returns the numeric sum.' vs current 'Simple addition tool'.
• Document output schema explicitly. Specify that both tools return {content: [{type: 'text', text: string}]} and clarify whether the text field contains a number, error message, or other format.
• Remove the 'add' tool or clearly differentiate it from 'calculate'. If 'add' is meant for simple cases, document: 'Use add for quick two-number addition; use calculate for complex operations with operator selection.'
• Enhance error messages with recovery guidance. Change 'Error: Cannot divide by zero' to 'Cannot divide by zero. Try a non-zero divisor or use a different operation.'
• Add parameter constraints to descriptions. Example: 'a: First number to add (any real number, no range limit)' or 'operation: Arithmetic operation to perform (must be one of: add, subtract, multiply, divide)'.