Tool Calling / Function Calling

Function calling lets the model return structured arguments so your app can call a real tool/API safely.

sequenceDiagram participant U as User participant A as Agent participant API as Weather API U->>A: Weather in Delhi? A->>API: get_weather(city="Delhi") API-->>A: 38C, clear A-->>U: It is 38C and clear in Delhi.

Benefits

Structured outputs reduce parsing errors.
App controls what tools are allowed.
Supports auditing and safer automation.

Safety tips

Validate all tool arguments.
Use allowlists for tools.
Require user confirmation for risky actions.