# TracerSessionResult

> **Class** in `langsmith`

📖 [View in docs](https://reference.langchain.com/python/langsmith/schemas/TracerSessionResult)

A project, hydrated with additional information.

Sessions are also referred to as "Projects" in the UI.

## Signature

```python
TracerSessionResult(
    self,
    _host_url: Optional[str] = None,
    **kwargs: Any = {},
)
```

## Extends

- `TracerSession`

## Properties

- `run_count`
- `latency_p50`
- `latency_p99`
- `total_tokens`
- `prompt_tokens`
- `completion_tokens`
- `last_run_start_time`
- `feedback_stats`
- `session_feedback_stats`
- `run_facets`
- `total_cost`
- `prompt_cost`
- `completion_cost`
- `first_token_p50`
- `first_token_p99`
- `error_rate`

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[View source on GitHub](https://github.com/langchain-ai/langsmith-sdk/blob/6a74bf5af9e542d8065af8edca54b2448f430916/python/langsmith/schemas.py#L755)