---
title: "Cancel session turn"
method: POST
path: "/v1/agents/sessions/{session_id}/cancel"
tags: ["Sessions"]
---

# Cancel session turn

`POST /v1/agents/sessions/{session_id}/cancel`

## Request

- Base URL: `https://api.sandbase.ai`
- URL: `https://api.sandbase.ai/v1/agents/sessions/{session_id}/cancel`
- Auth: one of:
  - HTTP bearer
  - API key in header `X-API-Key`

Request cancellation of the in-progress Turn. The body may be empty or {}. Idempotency-Key is required. An idle Session also returns 202 with accepted true and nothing changes.

## Headers

- `Idempotency-Key` string, required

## Request body

- EmptyObject

## Response `202`

Cancellation accepted

- SessionCancelAccepted
  - `session_id` string, required
  - `accepted` true, required

## Other responses

- `400`: invalid_request (malformed JSON, unknown fields, failed validation, or an unsupported option)
- `401`: unauthorized: missing, malformed, or conflicting API key headers
- `402`: spending_limit_exceeded: API key spending limit or organization balance exhausted
- `403`: insufficient_scope (scoped key) or org_disabled
- `404`: not_found: the resource does not exist in this organization
- `409`: conflict: stale row_version, lifecycle state, or Idempotency-Key reused with a different body
- `502`: executor_rejected or executor_contract_error from the execution layer
- `503`: authorization_unavailable, admission_unavailable, executor_unavailable, storage_unavailable, or internal_error

---

[API](https://skmtc.dev/sandbase/apis/sandbase-api.md) · [All operations](https://skmtc.dev/sandbase/apis/sandbase-api/llms.txt) · [OpenAPI document](https://skmtc.dev/sandbase/apis/sandbase-api/revisions/d40df2467ba2?raw)