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1---2title: Acknowledge Work3url: https://platform.claude.com/docs/en/api/beta/environments/work/ack4---56# Acknowledge Work78**POST** `/v1/environments/{environment_id}/work/{work_id}/ack`910Note: 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.1112Acknowledge receipt of a work item, transitioning it from 'queued' to 'starting' and removing it from the queue.1314## Path parameters1516- `environment_id: string`1718- `work_id: string`1920## Headers2122- `"anthropic-beta": optional array of AnthropicBeta`2324 Optional header to specify the beta version(s) you want to use.2526 - `string`2728 - `"message-batches-2024-09-24" or "prompt-caching-2024-07-31" or "computer-use-2024-10-22" or 43 more`2930 - `"message-batches-2024-09-24"`3132 - `"prompt-caching-2024-07-31"`3334 - `"computer-use-2024-10-22"`3536 - `"computer-use-2025-01-24"`3738 - `"pdfs-2024-09-25"`3940 - `"token-counting-2024-11-01"`4142 - `"token-efficient-tools-2025-02-19"`4344 - `"output-128k-2025-02-19"`4546 - `"files-api-2025-04-14"`4748 - `"mcp-client-2025-04-04"`4950 - `"mcp-client-2025-11-20"`5152 - `"dev-full-thinking-2025-05-14"`5354 - `"interleaved-thinking-2025-05-14"`5556 - `"code-execution-2025-05-22"`5758 - `"extended-cache-ttl-2025-04-11"`5960 - `"context-1m-2025-08-07"`6162 - `"context-management-2025-06-27"`6364 - `"model-context-window-exceeded-2025-08-26"`6566 - `"skills-2025-10-02"`6768 - `"fast-mode-2026-02-01"`6970 - `"output-300k-2026-03-24"`7172 - `"user-profiles-2026-03-24"`7374 - `"user-profiles-2026-08-18"`7576 - `"user-profiles-2026-09-04"`7778 - `"advisor-tool-2026-03-01"`7980 - `"managed-agents-2026-04-01"`8182 - `"cache-diagnosis-2026-04-07"`8384 - `"dreaming-2026-04-21"`8586 - `"thinking-token-count-2026-05-13"`8788 - `"server-side-fallback-2026-06-01"`8990 - `"server-side-fallback-2026-07-01"`9192 - `"fallback-credit-2026-06-01"`9394 - `"fallback-credit-2026-07-01"`9596 - `"agent-memory-2026-07-22"`9798 - `"mid-conversation-tool-changes-2026-07-01"`99100 - `"compact-2026-01-12"`101102 - `"computer-use-2025-11-24"`103104 - `"mcp-tunnels-2026-06-22"`105106 - `"structured-outputs-2025-11-13"`107108 - `"task-budgets-2026-03-13"`109110 - `"thinking-display-updates-2026-08-18"`111112 - `"ce-user-management-2026-07-13"`113114 - `"mid-conversation-output-config-2026-07-01"`115116 - `"thinking-binding-controls-2026-08-01"`117118 - `"mid-conversation-system-clear-at-2026-08-21"`119120 - `"compact-2026-09-04"`121122## Returns123124- `BetaSelfHostedWork object`125126 Work resource representing a unit of work in a self-hosted environment.127128 Work items are queued when sessions are created or when long-dormant sessions129 receive new messages. The environment worker polls for work to execute in a130 self-hosted sandbox.131132 - `type: "work"`133134 The type of object (always 'work')135136 default: work137138 - `id: string`139140 Work identifier (e.g., 'work_...')141142 - `acknowledged_at: string or null`143144 RFC 3339 timestamp when the work item was acknowledged and assigned to a self-hosted sandbox145146 - `created_at: string`147148 RFC 3339 timestamp when work was created149150 - `data: BetaSessionWorkData`151152 The actual work to be performed153154 - `type: "session"`155156 Type of work data157158 - `id: string`159160 Session identifier (e.g., 'session_...')161162 - `environment_id: string`163164 Environment identifier this work belongs to (e.g., `env_...`)165166 - `latest_heartbeat_at: string or null`167168 RFC 3339 timestamp of the most recent heartbeat169170 - `metadata: map[string]`171172 User-provided metadata key-value pairs associated with this work item173174 - `secret: string or null`175176 Credential payload used by the environment worker to execute this work item. May be populated when polling for work; null on all other retrieval paths.177178 - `started_at: string or null`179180 RFC 3339 timestamp when work execution started181182 - `state: "queued" or "starting" or "active" or 2 more`183184 Current state of the work item185186 - `"queued"`187188 - `"starting"`189190 - `"active"`191192 - `"stopping"`193194 - `"stopped"`195196 - `stop_requested_at: string or null`197198 RFC 3339 timestamp when stop was requested199200 - `stopped_at: string or null`201202 RFC 3339 timestamp when work execution stopped203204## Example205206```bash207curl https://api.anthropic.com/v1/environments/$ENVIRONMENT_ID/work/$WORK_ID/ack \208 -X POST \209 -H 'anthropic-version: 2023-06-01' \210 -H 'anthropic-beta: managed-agents-2026-04-01' \211 -H "X-Api-Key: $ANTHROPIC_API_KEY"212```213214### Response (200)215216```json217{218 "id": "id",219 "acknowledged_at": "acknowledged_at",220 "created_at": "created_at",221 "data": {222 "id": "id",223 "type": "session"224 },225 "environment_id": "environment_id",226 "latest_heartbeat_at": "latest_heartbeat_at",227 "metadata": {228 "foo": "string"229 },230 "secret": "secret",231 "started_at": "started_at",232 "state": "queued",233 "stop_requested_at": "stop_requested_at",234 "stopped_at": "stopped_at",235 "type": "work"236}237```238