Tool Calling

curl --location 'http://localhost:8080/v1/chat/completions' \
--header 'Content-Type: application/json' \
--data '{
    "model": "openai/gpt-4o-mini",
    "messages": [
        {"role": "user", "content": "What is 15 + 27? Use the calculator tool."}
    ],
    "tools": [
        {
            "type": "function",
            "function": {
                "name": "calculator",
                "description": "A calculator tool for basic arithmetic operations",
                "parameters": {
                    "type": "object",
                    "properties": {
                        "operation": {
                            "type": "string",
                            "description": "The operation to perform",
                            "enum": ["add", "subtract", "multiply", "divide"]
                        },
                        "a": {
                            "type": "number",
                            "description": "The first number"
                        },
                        "b": {
                            "type": "number",
                            "description": "The second number"
                        }
                    },
                    "required": ["operation", "a", "b"]
                }
            }
        }
    ],
    "tool_choice": "auto"
}'

{
    "choices": [{
        "message": {
            "role": "assistant", 
            "tool_calls": [{
                "id": "call_abc123",
                "type": "function",
                "function": {
                    "name": "calculator",
                    "arguments": "{\"operation\":\"add\",\"a\":15,\"b\":27}"
                }
            }]
        }
    }]
}

# Force use of specific tool
"tool_choice": {
    "type": "function",
    "function": {"name": "calculator"}
}

# Let AI decide automatically (default)
"tool_choice": "auto"

# Disable tool usage
"tool_choice": "none"