> ## Documentation Index > Fetch the complete documentation index at: https://tbd-6fc993ce-mintlify-add-deploy-button-docs-27400.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Stream invocation events via SSE > Establishes a Server-Sent Events (SSE) stream that delivers real-time logs and status updates for an invocation. The stream terminates automatically once the invocation reaches a terminal state. ## OpenAPI ````yaml https://api.onkernel.com/spec.yaml get /invocations/{id}/events openapi: 3.1.0 info: title: Kernel API description: Developer tools and cloud infrastructure for AI agents to use web browsers version: 0.1.0 servers: - url: https://api.onkernel.com description: API Server security: - bearerAuth: [] tags: - name: Invocations description: Invoke actions and stream or query invocation status and events. - name: Browsers description: >- Create and manage browser sessions, filesystem, processes, logs, and replays. - name: Proxies description: Create and manage proxy configurations for routing browser traffic. - name: Deployments description: Create and manage app deployments and stream deployment events. - name: Apps description: List applications and versions. - name: Profiles description: Create, list, retrieve, and delete browser profiles. - name: Extensions description: Create, list, retrieve, and delete browser extensions. - name: Browser Pools description: Create and manage browser pools for acquiring and releasing browsers. - name: Agent Auth description: Agent authentication flow endpoints for hosted credential capture. paths: /invocations/{id}/events: get: tags: - Invocations summary: Stream invocation events via SSE description: > Establishes a Server-Sent Events (SSE) stream that delivers real-time logs and status updates for an invocation. The stream terminates automatically once the invocation reaches a terminal state. operationId: getInvocationsEventsById parameters: - name: id in: path required: true description: The invocation ID to follow. schema: type: string - name: since in: query required: false description: >- Show logs since the given time (RFC timestamps or durations like 5m). schema: type: string example: '2025-06-20T12:00:00Z' responses: '200': description: SSE stream of invocation state updates and logs. headers: X-SSE-Content-Type: description: Media type of SSE data events (always application/json). schema: type: string const: application/json content: text/event-stream: schema: $ref: '#/components/schemas/InvocationEvent' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '404': $ref: '#/components/responses/NotFound' '500': $ref: '#/components/responses/InternalError' security: - bearerAuth: [] components: schemas: InvocationEvent: oneOf: - $ref: '#/components/schemas/LogEvent' - $ref: '#/components/schemas/InvocationStateEvent' - $ref: '#/components/schemas/ErrorEvent' - $ref: '#/components/schemas/SSEHeartbeatEvent' discriminator: propertyName: event mapping: log: '#/components/schemas/LogEvent' invocation_state: '#/components/schemas/InvocationStateEvent' error: '#/components/schemas/ErrorEvent' sse_heartbeat: '#/components/schemas/SSEHeartbeatEvent' description: Union type representing any invocation event. LogEvent: type: object description: A log entry from the application. required: - event - message - timestamp properties: event: type: string const: log description: Event type identifier (always "log"). timestamp: type: string format: date-time description: Time the log entry was produced. message: type: string description: Log message text. InvocationStateEvent: type: object description: An event representing the current state of an invocation. required: - event - invocation - timestamp properties: event: type: string const: invocation_state description: Event type identifier (always "invocation_state"). invocation: $ref: '#/components/schemas/Invocation' timestamp: type: string format: date-time description: Time the state was reported. ErrorEvent: type: object description: An error event from the application. required: - event - timestamp - error properties: event: type: string const: error description: Event type identifier (always "error"). timestamp: type: string format: date-time description: Time the error occurred. error: $ref: '#/components/schemas/Error' SSEHeartbeatEvent: type: object description: Heartbeat event sent periodically to keep SSE connection alive. required: - event - timestamp properties: event: type: string const: sse_heartbeat description: Event type identifier (always "sse_heartbeat"). timestamp: type: string format: date-time description: Time the heartbeat was sent. Error: type: object required: - code - message properties: code: type: string description: Application-specific error code (machine-readable) example: bad_request message: type: string description: Human-readable error description for debugging example: 'Missing required field: app_name' details: type: array description: Additional error details (for multiple errors) items: $ref: '#/components/schemas/ErrorDetail' inner_error: $ref: '#/components/schemas/ErrorDetail' Invocation: type: object properties: id: type: string description: ID of the invocation example: rr33xuugxj9h0bkf1rdt2bet app_name: type: string description: Name of the application example: my-app version: type: string description: Version label for the application example: 1.0.0 action_name: type: string description: Name of the action invoked example: analyze payload: type: string description: >- Payload provided to the invocation. This is a string that can be parsed as JSON. example: '{"data":"example input"}' output: type: string description: >- Output produced by the action, rendered as a JSON string. This could be: string, number, boolean, array, object, or null. example: '{"result":"success","data":"processed input"}' started_at: type: string format: date-time description: RFC 3339 Nanoseconds timestamp when the invocation started example: 2024-05-19T15:30:00.000000000Z07:00 finished_at: type: string format: date-time nullable: true description: >- RFC 3339 Nanoseconds timestamp when the invocation finished (null if still running) example: 2024-05-19T15:30:05.000000000Z07:00 status: type: string description: Status of the invocation enum: - queued - running - succeeded - failed example: succeeded status_reason: type: string description: Status reason example: Invocation completed successfully required: - id - app_name - version - action_name - started_at - status ErrorDetail: type: object properties: code: type: string description: Lower-level error code providing more specific detail example: invalid_input message: type: string description: Further detail about the error example: Provided version string is not semver compliant responses: BadRequest: description: Bad Request – invalid input content: application/json: schema: $ref: '#/components/schemas/Error' Unauthorized: description: Unauthorized – missing or invalid authorization token content: application/json: schema: $ref: '#/components/schemas/Error' NotFound: description: Resource not found content: application/json: schema: $ref: '#/components/schemas/Error' InternalError: description: Internal Server Error content: application/json: schema: $ref: '#/components/schemas/Error' securitySchemes: bearerAuth: type: http scheme: bearer ````