> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fiddler.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Session

> A captured session: the group of traces produced for one eval item.

## Attributes

<ResponseField name="session_id">
  The session id (`gen_ai.conversation.id`) shared by all traces in this
  session; equal to the item's `experiment_item_id` (they're 1:1).
</ResponseField>

<ResponseField name="spans">
  Captured spans for this session, each represented as a plain dict of span fields.
</ResponseField>