---
title: "Read Tracer Sessions"
method: GET
path: "/api/v1/sessions"
tags: ["tracer-sessions"]
---

# Read Tracer Sessions

`GET /api/v1/sessions`

Get all sessions.

## Query parameters

- `reference_free` boolean, nullable
- `reference_dataset` string[], nullable
- `id` string[], nullable
- `name` string, nullable
- `name_contains` string, nullable
- `dataset_version` string, nullable
- `sort_by` 'name' | 'start_time' | 'last_run_start_time' | 'latency_p50' | 'latency_p99' | 'error_rate' | 'feedback' | 'runs_count'
- `sort_by_desc` boolean
- `metadata` string, nullable
- `sort_by_feedback_key` string, nullable
- `sort_by_feedback_source` 'session' | 'run'
- `offset` integer
- `limit` integer
- `tag_value_id` string[], nullable
- `facets` boolean
- `filter` string, nullable
- `include_stats` boolean
- `use_approx_stats` boolean
- `stats_start_time` string, date-time, nullable
- `stats_select` string[], nullable
- `stats_filter` string, nullable

## Headers

- `accept` string, nullable

## Response `200`

Successful Response

- TracerSession[]
  - `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/revisions/a0acb3a6a101/schema)