Reference · How-to · ~12 min
How to add function calling
Let the model request actions; your code executes them safely.
Let the model request actions; your code executes them safely.
Steps
1. **Define tools** — name, description, JSON schema for parameters
2. **Send tools** with the chat request
3. If the model returns a **tool call**, parse arguments
4. **Run your function** (validate args first!)
5. Send **tool result** back as a message; model writes final reply
Tool schema example
{
"name": "get_weather",
"description": "Get current weather for a city",
"parameters": {
"type": "object",
"properties": {
"city": { "type": "string" }
},
"required": ["city"]
}
}