> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tracecat.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Workflow metadata

> Quick reference for the ENV fields available in Tracecat expressions: workflow run identifiers, timestamps, trigger type, and Workflow environment.

## Fields

| Expression                          | Description                                                                                                                |
| ----------------------------------- | -------------------------------------------------------------------------------------------------------------------------- |
| `${{ ENV.workflow.start_time }}`    | Wall-clock time the run started                                                                                            |
| `${{ ENV.workflow.time_anchor }}`   | Anchor timestamp Tracecat uses for deterministic replay                                                                    |
| `${{ ENV.workflow.dispatch_type }}` | `push` when the caller supplied the workflow definition, `pull` when the run fetched the committed definition              |
| `${{ ENV.workflow.execution_id }}`  | Unique ID of this workflow execution                                                                                       |
| `${{ ENV.workflow.run_id }}`        | UUID of this execution's current run attempt                                                                               |
| `${{ ENV.workflow.trigger_type }}`  | `manual`, `scheduled`, `webhook`, or `case`                                                                                |
| `${{ ENV.workflow.logical_time }}`  | Logical timestamp of the current action; `FN.now()` returns it. A `run_if` evaluated before any action has run sees `None` |
| `${{ ENV.environment }}`            | The [Workflow environment](/automations/workflows#environments) the run executes in                                        |

Every `ENV.*` expression resolves to `None` in an action invoked as an agent tool.

## Examples

Branch on the trigger type:

<CodeGroup>
  ```yaml Expression theme={null}
  run_if: ${{ ENV.workflow.trigger_type == "webhook" }}
  ```

  ```json Result theme={null}
  {
    "run_if": true
  }
  ```
</CodeGroup>

## Related pages

* See [Workflow metadata](/automations/core-concepts/workflow-metadata) for concepts and when to use each field.
* See [Expressions](/automations/core-concepts/expressions) for expression syntax and contexts.