Two tools with basic schemas and minimal descriptions. Both tools have input schemas with proper types (number, string enum), but descriptions are extremely brief (10-40 chars), falling well below the 50-200 char baseline for LLM-optimized descriptions. The 'calculate' tool has a well-structured enum constraint for operations, but lacks guidance on when to use it vs 'add'. No output schema documentation. Error handling for divide-by-zero is present but minimal. Tool composition is reasonable (add vs calculate separation), but descriptions don't explain the distinction or use cases.

• Expand tool descriptions to 50-150 chars each. Example for 'add': 'Adds two numbers and returns the sum. Use this for simple two-number addition; use calculate() for multiple operations or dynamic operation selection.'
• Document output schema explicitly. Both tools return {type: 'text', text: string (numeric result)}. Add to descriptions: 'Returns a text response containing the numeric result as a string.'
• Add error recovery guidance. For divide-by-zero, return: {content: [{type: 'text', text: 'Error: Cannot divide by zero. Verify the divisor (b parameter) is non-zero and retry.'}]}
• Enhance parameter descriptions with format/range. Example: 'a: First number to add (any real number, e.g., -1000 to 1000 or decimals like 3.14)'
• Consider consolidating to a single 'calculate' tool if 'add' is rarely used independently, or clearly document when each is preferred to reduce LLM confusion.