Tool Calling

curl https://api.phaseo.app/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5-nano",
    "messages": [
      { "role": "user", "content": "What is the weather in London?" }
    ],
    "tools": [
      {
        "type": "function",
        "function": {
          "name": "get_weather",
          "description": "Get current weather by city",
          "parameters": {
            "type": "object",
            "properties": {
              "city": { "type": "string" }
            },
            "required": ["city"]
          }
        }
      }
    ],
    "tool_choice": {
      "type": "function",
      "function": { "name": "get_weather" }
    },
    "stream": false
  }'

{
  "id": "chatcmpl_...",
  "object": "chat.completion",
  "choices": [
    {
      "index": 0,
      "finish_reason": "tool_calls",
      "message": {
        "role": "assistant",
        "content": null,
        "tool_calls": [
          {
            "id": "call_123",
            "type": "function",
            "function": {
              "name": "get_weather",
              "arguments": "{\"city\":\"London\"}"
            }
          }
        ]
      }
    }
  ]
}