# Workflows, Workers - Stream Workflow instance events in your Worker or via the API with .subscribe()

Publisher-attributed story with a reviewed brief or permitted publisher paragraph. The original publisher is responsible for the linked reporting.

- Publisher: Cloudflare Developers
- Category: Cloud
- Original publication time: 2026-09-15T12:00:00Z
- First observed by NexusTechWire: 2026-10-01T15:54:33Z
- Original source: https://developers.cloudflare.com/changelog/post/2026-09-15-instance-event-subscriptions/
- NexusTechWire record: https://nexustechwire.com/news/news-24b2f823436353ff210b

## From the publisher

You can now stream Workflow instance events via WorkflowInstance.subscribe() and the GET /subscribe API endpoint. Workers and HTTP clients can react to workflow and step events, including attempts, sleeps, waits, and rollbacks, without polling for instance status. A subscription first streams the entire event history of the Workflow instance. After streaming past events, the subscription waits for new events as the instance runs. You can use filter to receive only specific event types or cursor to start a subscription at a specific event. Use .subscribe() to update Workflow status in user-facing dashboards, send notifications when steps complete, or trigger follow-up work for specific events.

Source license: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/). Publisher excerpt shortened and converted to plain text. Original source license applies.

Read the full original: [Cloudflare Developers](https://developers.cloudflare.com/changelog/post/2026-09-15-instance-event-subscriptions/)

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