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

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# Event subscriptions

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

For more information on [Event Subscriptions](https://developers.cloudflare.com/queues/event-subscriptions/), refer to the [management guide](https://developers.cloudflare.com/queues/event-subscriptions/manage-event-subscriptions/).

## Available Workflows events

#### `instance.queued`

Triggered when an instance was created and is awaiting execution.

**Example:**

```
{  "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:**

```
{  "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:**

```
{  "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:**

```
{  "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:**

```
{  "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:**

```
{  "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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