---
title: "Cancel Experiment"
method: POST
path: "/sessions/{session_id}/experiments/{run_id}/cancel"
tags: ["experiments"]
---

# Cancel Experiment

`POST /sessions/{session_id}/experiments/{run_id}/cancel`

## Request

- The document declares no server URL.
- Auth: none declared

Request a cooperative stop; terminal status follows actual worker cleanup.

## Path parameters

- `session_id` string, required
- `run_id` string, required

## Response `202`

Successful Response

- object

## Other responses

- `422`: Validation Error

## Changes

- **2026-10-28** `c248371b9401`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/qredence/apis/fleet-rlm/changes/sessions/:session_id/experiments/:run_id/cancel/post.md)

---

[API](https://skmtc.dev/qredence/apis/fleet-rlm.md) - [All operations](https://skmtc.dev/qredence/apis/fleet-rlm/llms.txt) - [OpenAPI document](https://skmtc.dev/qredence/apis/fleet-rlm/revisions/a1192f9fece1?raw)