---
title: "Undo Outcome Event"
method: POST
path: "/api/v1/parts/outcome-events/{event_id}/undo"
tags: ["outcome-events"]
---

# Undo Outcome Event

`POST /api/v1/parts/outcome-events/{event_id}/undo`

Undo a confirmed outcome event within the 10-minute window.

Transitions confirmed -> undone. Also dismisses the linked ViewerCallout
if one was created during confirm.

## Path parameters

- `event_id` string, uuid, required

## Response `200`

Successful Response

- object

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.dev/prototyping/apis/prototyping-io-api.md) · [All operations](https://skmtc.dev/prototyping/apis/prototyping-io-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/prototyping/prototyping-io-api/revisions/f4a0079fbb57/schema)