> ## Documentation Index > Fetch the complete documentation index at: https://openworklabs.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Record worker heartbeat > Accepts signed heartbeat and recent-activity updates from a worker so Den can track worker health and recent usage. ## OpenAPI ````yaml /openapi.json post /v1/workers/{id}/activity-heartbeat openapi: 3.1.0 info: title: Den API description: >- OpenAPI spec for the Den control plane API. Authentication: - Use `Authorization: Bearer ` for user-authenticated routes that require a Den session. - Use `x-api-key: ` for API-key-authenticated routes that accept organization API keys. - Public routes like health and documentation do not require authentication. Swagger tip: use the security schemes in the Authorize dialog to set either `bearerAuth` or `denApiKey` before trying protected endpoints. version: dev servers: - url: https://api.openworklabs.com security: [] tags: - name: System description: Service health and operational routes. - name: Organizations description: Top-level organization creation and context routes. - name: Invitations description: Invitation preview, acceptance, creation, and cancellation routes. - name: API Keys description: Organization API key management routes. - name: Members description: Organization member management routes. - name: Roles description: Organization custom role management routes. - name: Teams description: Organization team management routes. - name: Templates description: Organization shared template routes. - name: LLM Providers description: Organization LLM provider catalog, configuration, and access routes. - name: Skills description: Organization skill authoring and sharing routes. - name: Skill Hubs description: Organization skill hub management and access routes. - name: Workers description: Worker lifecycle, billing, and runtime routes. - name: Worker Runtime description: Worker runtime inspection and upgrade routes. - name: Worker Activity description: Worker heartbeat and activity reporting routes. - name: Admin description: Administrative reporting routes. - name: Users description: Current user and membership routes. paths: /v1/workers/{id}/activity-heartbeat: post: tags: - Workers - Worker Activity summary: Record worker heartbeat description: >- Accepts signed heartbeat and recent-activity updates from a worker so Den can track worker health and recent usage. operationId: postV1WorkersByIdActivityHeartbeat parameters: - in: path name: id schema: format: typeid type: string minLength: 30 maxLength: 30 pattern: ^wrk_.* required: true description: Den TypeID with 'wrk_' prefix and a 26-character base32 suffix. requestBody: required: true content: application/json: schema: type: object properties: sentAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ isActiveRecently: type: boolean lastActivityAt: anyOf: - type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ - type: 'null' openSessionCount: type: integer minimum: 0 maximum: 9007199254740991 required: - isActiveRecently responses: '200': description: Worker heartbeat accepted successfully. content: application/json: schema: $ref: '#/components/schemas/WorkerHeartbeatResponse' '400': description: The heartbeat payload or worker path parameters were invalid. content: application/json: schema: $ref: '#/components/schemas/InvalidRequestError' '401': description: The worker heartbeat token was missing or invalid. content: application/json: schema: $ref: '#/components/schemas/UnauthorizedError' '404': description: The worker could not be found. content: application/json: schema: $ref: '#/components/schemas/NotFoundError' components: schemas: WorkerHeartbeatResponse: type: object properties: ok: type: boolean const: true workerId: type: string isActiveRecently: type: boolean openSessionCount: anyOf: - type: integer minimum: -9007199254740991 maximum: 9007199254740991 - type: 'null' lastHeartbeatAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ lastActiveAt: anyOf: - type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ - type: 'null' required: - ok - workerId - isActiveRecently - openSessionCount - lastHeartbeatAt - lastActiveAt InvalidRequestError: type: object properties: error: type: string const: invalid_request details: type: array items: type: object properties: message: type: string path: type: array items: anyOf: - type: string - type: number required: - message additionalProperties: {} required: - error - details UnauthorizedError: type: object properties: error: type: string const: unauthorized required: - error NotFoundError: type: object properties: error: type: string message: type: string required: - error ````