A developer ships a tool with this description: 'search_catalog — Searches the product catalog.' The model sometimes calls this tool when users ask general questions not related to products. Which element is missing that would most reduce false-positive calls?
Answer: An explicit trigger condition: 'Call this when the user is looking for a product by name, category, or attribute'
An explicit trigger condition tells the model when to call the tool, not just what it does. Without it, the model uses the tool name and general description to infer scope — and will over-generalize. Adding a trigger condition ('Call this when...') creates a precise activation criterion that reduces false positives. Return value descriptions (A) tell the model what to expect after calling, not when to call. Parameter format descriptions (C) reduce malformed calls but don't affect routing. Examples (D) are helpful for complex schemas but weaker than explicit trigger conditions for routing decisions.