---
title: "Acknowledge a Workbench event after visible delivery"
method: POST
path: "/api/workbench/events/:eventId/ack"
tags: ["Workbench"]
---

# Acknowledge a Workbench event after visible delivery

`POST /api/workbench/events/:eventId/ack`

## Request

- Base URL: `https://api.cernion.de`
- URL: `https://api.cernion.de/api/workbench/events/:eventId/ack`
- Auth: none declared

CET-governed Workbench/Tenant-Gateway API for Open WebUI clients. Tokens stay server-side; CET remains case-state and governance authority.

## Path parameters

- `eventId` string, required

## Query parameters

- `token` string

## Request body

- object
  - `clientId` string, required
  - `token` string: Optional Cernion MCP token for this request. Overrides CERNION_TOKEN when provided.

## Response `200`

Workbench response

- object
  - `eventId` string: Case Event Outbox event id
  - `caseId` string: CET case id
  - `cetCaseId` string: CET case id
  - `eventType` string: CET event type
  - `severity` string: UI severity
  - `requiresUserAttention` boolean: Whether the event should be visible as attention item
  - `title` string: UI-safe event title
  - `safeDisplayText` string: UI-safe event summary
  - `sensitivityLevel` string: Event sensitivity
  - `deliveryState` string: Delivery state
  - `conversationRef` object
    - `client` string: Workbench client id, usually open-webui
    - `conversationId` string: Client conversation id
    - `openWebuiConversationId` string: Open WebUI conversation id
    - `openWebuiUserId` string: Open WebUI user id
    - `openWebuiOrgId` string: Open WebUI organization id
    - `caseId` string: Linked CET case id
    - `cetCaseId` string: Linked CET case id
    - `caseStateVersion` number: Current CET case-state version
  - `createdAt` string: ISO timestamp

## Other responses

- `403`: Tenant, actor, role or sensitivity denied
- `404`: Workbench resource not found
- `409`: Stale or conflicting mapping
- `422`: Invalid workbench request

---

[API](https://skmtc.dev/cernion/apis/cernion-energy-tools-api.md) · [All operations](https://skmtc.dev/cernion/apis/cernion-energy-tools-api/llms.txt) · [OpenAPI document](https://skmtc.dev/cernion/apis/cernion-energy-tools-api/revisions/cdb94473b538?raw)