---
title: "Cancel an interface handoff before its source controller stops"
method: DELETE
path: "/api/v1/sessions/{sessionId}/interface-transition"
tags: ["sessions"]
---

# Cancel an interface handoff before its source controller stops

`DELETE /api/v1/sessions/{sessionId}/interface-transition`

## Path parameters

- `sessionId` string, required — Session identifier, e.g. project-1.

## Response `202`

Accepted

- CancelSessionInterfaceTransitionResponse
  - `ok` boolean, required
  - `sessionId` string, required

## Other responses

- `404` — Not Found
- `409` — Conflict
- `500` — Internal Server Error
- `501` — Not Implemented

## Changes

- **2026-09-03** `d31a2d019c47` — 4 info
  - added the optional property `reporting_owner` to the response with the `404` status
  - added the optional property `reporting_owner` to the response with the `409` status
  - added the optional property `reporting_owner` to the response with the `500` status
  - added the optional property `reporting_owner` to the response with the `501` status
- **2026-08-06** `d8396ad2c721` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/composiohq/apis/agent-orchestrator-http-daemon/changes/api/v1/sessions/:sessionId/interface-transition/delete.md)

---

[API](https://skmtc.dev/composiohq/apis/agent-orchestrator-http-daemon.md) · [All operations](https://skmtc.dev/composiohq/apis/agent-orchestrator-http-daemon/llms.txt) · [OpenAPI document](https://skmtc.dev/composiohq/apis/agent-orchestrator-http-daemon/revisions/c248c9b03608?raw)