Task History ID ({{task_history_id}})

What is {{task_history_id}} Variable?​

The task_history_id variable provides a unique identifier for each workflow execution. Every time a workflow runs, a new Task History ID is automatically generated, allowing you to track and control that specific execution.
Using {{task_history_id}}, you can dynamically access this ID within your workflow and use it across different actions or integrations.

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What Does It Do?​

When you use {{task_history_id}} inside a workflow:

• It dynamically gets replaced with the actual Task History ID at runtime
• It allows you to capture and store the execution ID
• It helps you track, reference, and control that specific workflow run

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How It Works​

1. A workflow is triggered
2. The system generates a unique Task History ID
3. You use {{task_history_id}} in any step
4. During execution, it is replaced with the real ID
5. The value can then be stored or used in other actions

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Example​

If a workflow execution has this ID:

IjU3NjYiNTZjMDYpMTA0MoA1MjY0NTMzNTUxM2Ei_pc

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Using:

{{task_history_id}}

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will output:

IjU3NjYiNTZjMDYpMTA0MoA1MjY0NTMzNTUxM2Ei_pc

Click to expand...

When the workflow runs, the system automatically replaces {{task_history_id}} with the actual Task History ID of that execution. This value can then be stored or passed to other actions.

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Why is it Useful?​

This variable is important when you need to work with individual workflow executions, especially in cases where workflows run over time.
It helps you:

• Identify a specific workflow run
• Store execution details
• Control or stop a running workflow
• Build user-controlled automations

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Real-World Use Case​

Scenario: Stop an Ongoing Workflow​

You have a workflow that sends messages or emails over time.
Now, a user wants to stop it.

How {{task_history_id}} Helps​

1. When the workflow starts:
   • Store user data (email/phone)
   • Store {{task_history_id}}
2. When user requests to stop:
   • Search using their email/phone
   • Get the stored Task History ID
3. Use that ID to stop the workflow

This ensures you stop the exact execution for that user, not all workflows.

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Where Can You Use It?​

You can use {{task_history_id}} in:

• Data storage apps (Google Sheets, databases, etc.)
• API requests
• Workflow control actions (Pabbly Connect Manager)

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Important Notes​

• Generated automatically for every workflow execution
• Always unique per execution
• Must be stored externally if you want to use it later
• Cannot be reused across different executions

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Summary​

{{task_history_id}} is used to identify and manage a specific workflow execution.
It allows you to:

• Track workflows
• Store execution references
• Control or stop workflows dynamically