OpenAI function calling transforms unstructured conversations into structured API calls. Models output JSON matching defined schemas. This enables reliable integration with databases, APIs, and business systems.
Function Definition
Define functions with clear names, descriptions, and JSON schemas for parameters. Descriptions help the model understand when to use each function. Detailed schemas ensure valid outputs.
- Write clear function descriptions explaining purpose and usage
- Define comprehensive JSON schemas with property descriptions
- Use enum constraints for categorical parameters
- Mark required vs optional parameters appropriately
- Test function definitions with diverse inputs
Execution Patterns
Parse function call responses and execute corresponding logic. Return function results for continued conversation. Handle parallel function calls for efficiency. Validate outputs before execution.