Advanced Features

Tool Calling / Function Calling

Prysm captures tool calls from OpenAI, Anthropic, and Google Gemini models. When a model returns tool calls, they're stored in the trace and displayed in the Request Explorer.

response = client.chat.completions.create(
    model="gpt-4o-mini",
    messages=[{"role": "user", "content": "What's the weather in London?"}],
    tools=[{
        "type": "function",
        "function": {
            "name": "get_weather",
            "description": "Get current weather for a city",
            "parameters": {
                "type": "object",
                "properties": {"city": {"type": "string"}},
                "required": ["city"]
            }
        }
    }],
)

Logprobs

Request logprobs from OpenAI and they'll be captured in the trace.

response = client.chat.completions.create(
    model="gpt-4o-mini",
    messages=[{"role": "user", "content": "The capital of France is"}],
    logprobs=True,
    top_logprobs=3,
)

What Gets Captured