---
title: Event subscriptions
description: Subscribe to Workflows lifecycle events, including instance completion and failure notifications.
image: https://edgetunnel-b2h.pages.dev/dev-products-preview.png
---

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# Event subscriptions

[Event subscriptions](https://edgetunnel-b2h.pages.dev/queues/event-subscriptions/) allow you to receive messages when events occur across your Cloudflare account. Cloudflare products (e.g., [KV](https://edgetunnel-b2h.pages.dev/kv/), [Workers AI](https://edgetunnel-b2h.pages.dev/workers-ai/), [Workers](https://edgetunnel-b2h.pages.dev/workers/)) can publish structured events to a [queue](https://edgetunnel-b2h.pages.dev/queues/), which you can then consume with Workers or [HTTP pull consumers](https://edgetunnel-b2h.pages.dev/queues/configuration/pull-consumers/) to build custom workflows, integrations, or logic.

For more information on [Event Subscriptions](https://edgetunnel-b2h.pages.dev/queues/event-subscriptions/), refer to the [management guide](https://edgetunnel-b2h.pages.dev/queues/event-subscriptions/manage-event-subscriptions/).

## Available Workflows events

#### `instance.queued`

Triggered when an instance was created and is awaiting execution.

**Example:**

```json
{
  "type": "cf.workflows.workflow.instance.queued",
  "source": {
    "type": "workflows.workflow",
    "workflowName": "my-workflow"
  },
  "payload": {
    "versionId": "v1",
    "instanceId": "inst-12345678-90ab-cdef-1234-567890abcdef"
  },
  "metadata": {
    "accountId": "f9f79265f388666de8122cfb508d7776",
    "eventSubscriptionId": "1830c4bb612e43c3af7f4cada31fbf3f",
    "eventSchemaVersion": 1,
    "eventTimestamp": "2025-05-01T02:48:57.132Z"
  }
}
```

#### `instance.started`

Triggered when an instance starts or resumes execution.

**Example:**

```json
{
  "type": "cf.workflows.workflow.instance.started",
  "source": {
    "type": "workflows.workflow",
    "workflowName": "my-workflow"
  },
  "payload": {
    "versionId": "v1",
    "instanceId": "inst-12345678-90ab-cdef-1234-567890abcdef"
  },
  "metadata": {
    "accountId": "f9f79265f388666de8122cfb508d7776",
    "eventSubscriptionId": "1830c4bb612e43c3af7f4cada31fbf3f",
    "eventSchemaVersion": 1,
    "eventTimestamp": "2025-05-01T02:48:57.132Z"
  }
}
```

#### `instance.paused`

Triggered when an instance pauses execution.

**Example:**

```json
{
  "type": "cf.workflows.workflow.instance.paused",
  "source": {
    "type": "workflows.workflow",
    "workflowName": "my-workflow"
  },
  "payload": {
    "versionId": "v1",
    "instanceId": "inst-12345678-90ab-cdef-1234-567890abcdef"
  },
  "metadata": {
    "accountId": "f9f79265f388666de8122cfb508d7776",
    "eventSubscriptionId": "1830c4bb612e43c3af7f4cada31fbf3f",
    "eventSchemaVersion": 1,
    "eventTimestamp": "2025-05-01T02:48:57.132Z"
  }
}
```

#### `instance.errored`

Triggered when an instance step throws an error.

**Example:**

```json
{
  "type": "cf.workflows.workflow.instance.errored",
  "source": {
    "type": "workflows.workflow",
    "workflowName": "my-workflow"
  },
  "payload": {
    "versionId": "v1",
    "instanceId": "inst-12345678-90ab-cdef-1234-567890abcdef"
  },
  "metadata": {
    "accountId": "f9f79265f388666de8122cfb508d7776",
    "eventSubscriptionId": "1830c4bb612e43c3af7f4cada31fbf3f",
    "eventSchemaVersion": 1,
    "eventTimestamp": "2025-05-01T02:48:57.132Z"
  }
}
```

#### `instance.terminated`

Triggered when an instance is manually terminated.

**Example:**

```json
{
  "type": "cf.workflows.workflow.instance.terminated",
  "source": {
    "type": "workflows.workflow",
    "workflowName": "my-workflow"
  },
  "payload": {
    "versionId": "v1",
    "instanceId": "inst-12345678-90ab-cdef-1234-567890abcdef"
  },
  "metadata": {
    "accountId": "f9f79265f388666de8122cfb508d7776",
    "eventSubscriptionId": "1830c4bb612e43c3af7f4cada31fbf3f",
    "eventSchemaVersion": 1,
    "eventTimestamp": "2025-05-01T02:48:57.132Z"
  }
}
```

#### `instance.completed`

Triggered when an instance finishes execution successfully.

**Example:**

```json
{
  "type": "cf.workflows.workflow.instance.completed",
  "source": {
    "type": "workflows.workflow",
    "workflowName": "my-workflow"
  },
  "payload": {
    "versionId": "v1",
    "instanceId": "inst-12345678-90ab-cdef-1234-567890abcdef"
  },
  "metadata": {
    "accountId": "f9f79265f388666de8122cfb508d7776",
    "eventSubscriptionId": "1830c4bb612e43c3af7f4cada31fbf3f",
    "eventSchemaVersion": 1,
    "eventTimestamp": "2025-05-01T02:48:57.132Z"
  }
}
```

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