Two tools with basic schemas and minimal descriptions. Both tools have input schemas with proper types (number, enum), but descriptions are extremely short (10-40 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. Missing guidance on error recovery.

• Expand tool descriptions to 100-200 chars. Example for 'calculate': 'Performs arithmetic operations (add, subtract, multiply, divide) on two numbers. Use this for multi-operation math; use add() for simple addition only. Returns numeric result or error message.'
• Add parameter descriptions in schema. For 'operation' enum, add: 'The arithmetic operation to perform: add (a+b), subtract (a-b), multiply (a*b), or divide (a/b). Division by zero returns an error.'
• Document output schema. Specify that both tools return {content: [{type: 'text', text: string}]} where text is the numeric result or error message.
• Remove the 'add' tool. It duplicates 'calculate' with operation='add'. Consolidate to one canonical tool to reduce LLM confusion.
• Enhance error handling in 'add' tool. Validate inputs are numbers; return structured error: 'Invalid input: a and b must be numbers. Got a={a}, b={b}.' Include recovery guidance.