Two tools with basic schemas and minimal descriptions. Both tools have input schemas with proper types (number, string, enum), but descriptions are extremely short (10-50 chars) and lack context for LLM selection. No output schema documentation. Error handling is minimal (divide-by-zero check in calculate tool only). Tool names are action-oriented (add, calculate) but descriptions don't explain WHEN to use each tool or their differences. No parameter descriptions beyond type hints in schema. Lacks guidance on error recovery or tool composition.

• Expand tool descriptions to 50-200 chars. For 'add': 'Performs simple addition of two numbers. Use this for basic arithmetic when you only need to add two values. Returns the numeric sum.' For 'calculate': 'Performs arithmetic operations (add, subtract, multiply, divide) on two numbers. Use this when you need flexibility across multiple operation types. Returns the numeric result or error message.'
• Add parameter descriptions in schema. For both tools: a: 'First operand (numeric value)', b: 'Second operand (numeric value)'. For calculate: operation: 'The arithmetic operation to perform: add, subtract, multiply, or divide'.
• Document output schema explicitly. Both tools return {content: [{type: 'text', text: string}]}. Add a note: 'Returns structured response with text content field containing the numeric result as a string, or error message if operation fails.'
• Improve error handling in calculate tool. Return structured error: {content: [{type: 'text', text: 'Error: division by zero. Provide non-zero divisor.'}]} with clear guidance on what went wrong and how to fix it.
• Clarify tool composition. Add note to 'add' description: 'For operations beyond addition (subtract, multiply, divide), use the calculate tool instead.' This prevents LLM confusion and guides proper tool selection.