## Acknowledge Work

`BetaSelfHostedWork Beta.Environments.Work.Ack(WorkAckParamsparameters, CancellationTokencancellationToken = default)`

**post** `/v1/environments/{environment_id}/work/{work_id}/ack`

Note: these endpoints are called automatically by the pre-built environment worker provided in the SDKs and CLI, for orchestrating sessions with self-hosted sandbox environments. They are included here as a reference; you do not need to invoke them directly.

Acknowledge receipt of a work item, transitioning it from 'queued' to 'starting' and removing it from the queue.

### Parameters

- `WorkAckParams parameters`

  - `required string environmentID`

    Path param

  - `required string workID`

    Path param

  - `IReadOnlyList<AnthropicBeta> betas`

    Header param: Optional header to specify the beta version(s) you want to use.

    - `"message-batches-2024-09-24"MessageBatches2024_09_24`

    - `"prompt-caching-2024-07-31"PromptCaching2024_07_31`

    - `"computer-use-2024-10-22"ComputerUse2024_10_22`

    - `"computer-use-2025-01-24"ComputerUse2025_01_24`

    - `"pdfs-2024-09-25"Pdfs2024_09_25`

    - `"token-counting-2024-11-01"TokenCounting2024_11_01`

    - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19`

    - `"output-128k-2025-02-19"Output128k2025_02_19`

    - `"files-api-2025-04-14"FilesApi2025_04_14`

    - `"mcp-client-2025-04-04"McpClient2025_04_04`

    - `"mcp-client-2025-11-20"McpClient2025_11_20`

    - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14`

    - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14`

    - `"code-execution-2025-05-22"CodeExecution2025_05_22`

    - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11`

    - `"context-1m-2025-08-07"Context1m2025_08_07`

    - `"context-management-2025-06-27"ContextManagement2025_06_27`

    - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26`

    - `"skills-2025-10-02"Skills2025_10_02`

    - `"fast-mode-2026-02-01"FastMode2026_02_01`

    - `"output-300k-2026-03-24"Output300k2026_03_24`

    - `"user-profiles-2026-03-24"UserProfiles2026_03_24`

    - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01`

    - `"managed-agents-2026-04-01"ManagedAgents2026_04_01`

    - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07`

    - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13`

    - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01`

    - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01`

### Returns

- `class BetaSelfHostedWork:`

  Work resource representing a unit of work in a self-hosted environment.

  Work items are queued when sessions are created or when long-dormant sessions
  receive new messages. The environment worker polls for work to execute in a
  self-hosted sandbox.

  - `required string ID`

    Work identifier (e.g., 'work_...')

  - `required string? AcknowledgedAt`

    RFC 3339 timestamp when the work item was acknowledged and assigned to a self-hosted sandbox

  - `required string CreatedAt`

    RFC 3339 timestamp when work was created

  - `required BetaSessionWorkData Data`

    The actual work to be performed

    - `required string ID`

      Session identifier (e.g., 'session_...')

    - `JsonElement Type "session"constant`

      Type of work data

  - `required string EnvironmentID`

    Environment identifier this work belongs to (e.g., `env_...`)

  - `required string? LatestHeartbeatAt`

    RFC 3339 timestamp of the most recent heartbeat

  - `required IReadOnlyDictionary<string, string> Metadata`

    User-provided metadata key-value pairs associated with this work item

  - `required string? StartedAt`

    RFC 3339 timestamp when work execution started

  - `required State State`

    Current state of the work item

    - `"queued"Queued`

    - `"starting"Starting`

    - `"active"Active`

    - `"stopping"Stopping`

    - `"stopped"Stopped`

  - `required string? StopRequestedAt`

    RFC 3339 timestamp when stop was requested

  - `required string? StoppedAt`

    RFC 3339 timestamp when work execution stopped

  - `JsonElement Type "work"constant`

    The type of object (always 'work')

### Example

```csharp
WorkAckParams parameters = new()
{
    EnvironmentID = "env_011CZkZ9X2dpNyB7HsEFoRfW",
    WorkID = "work_id",
};

var betaSelfHostedWork = await client.Beta.Environments.Work.Ack(parameters);

Console.WriteLine(betaSelfHostedWork);
```

#### Response

```json
{
  "id": "id",
  "acknowledged_at": "acknowledged_at",
  "created_at": "created_at",
  "data": {
    "id": "id",
    "type": "session"
  },
  "environment_id": "environment_id",
  "latest_heartbeat_at": "latest_heartbeat_at",
  "metadata": {
    "foo": "string"
  },
  "started_at": "started_at",
  "state": "queued",
  "stop_requested_at": "stop_requested_at",
  "stopped_at": "stopped_at",
  "type": "work"
}
```
