---
title: "Read Tracer Session"
method: GET
path: "/api/v1/sessions/{session_id}"
tags: ["tracer-sessions"]
---

# Read Tracer Session

`GET /api/v1/sessions/{session_id}`

Get a specific session.

## Path parameters

- `session_id` string, uuid, required

## Query parameters

- `include_stats` boolean
- `stats_start_time` string, date-time, nullable

## Headers

- `accept` string, nullable

## Response `200`

Successful Response

- TracerSession — TracerSession schema.
  - `start_time` string, date-time
  - `end_time` string, date-time, nullable
  - `extra` object, nullable
  - `name` string
  - `description` string, nullable
  - `default_dataset_id` string, uuid, nullable
  - `reference_dataset_id` string, uuid, nullable
  - `trace_tier` 'longlived' | 'shortlived'
  - `id` string, uuid, required
  - `run_count` integer, nullable
  - `latency_p50` number, nullable
  - `latency_p99` number, nullable
  - `first_token_p50` number, nullable
  - `first_token_p99` number, nullable
  - `total_tokens` integer, nullable
  - `prompt_tokens` integer, nullable
  - `completion_tokens` integer, nullable
  - `total_cost` string, nullable
  - `prompt_cost` string, nullable
  - `completion_cost` string, nullable
  - `tenant_id` string, uuid, required
  - `last_run_start_time` string, date-time, nullable
  - `last_run_start_time_live` string, date-time, nullable
  - `feedback_stats` object, nullable
  - `session_feedback_stats` object, nullable
  - `run_facets` object[], nullable
  - `error_rate` number, nullable
  - `streaming_rate` number, nullable
  - `test_run_number` integer, nullable

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.net/langchain-ai/apis/langsmith.md) · [All operations](https://skmtc.net/langchain-ai/apis/langsmith/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/langchain-ai/langsmith/versions/a0acb3a6a101/schema)