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

# Variables

> Managing data during agent execution

Variables allow you to store and use data that your agent extracts through the execution of the agent.

## Variable Operations

### Creating Variables

Variables are automatically populated when creating [extraction blocks](/workflow-blocks/extraction) through the [Recursion Agent](/recursion-agent/using-recursion-agent) or executing existing extraction blocks.

<Frame>
  <img src="https://mintcdn.com/kuraaiinc/th72dn9VxhWd2b4C/images/data_extraction_variable.png?fit=max&auto=format&n=th72dn9VxhWd2b4C&q=85&s=51a49bf375d156855713702477e67656" width="400" alt="Runtime variable extraction example" data-path="images/data_extraction_variable.png" />
</Frame>

Populated variables are added into the Variables tab in the Builder after execution.

<Frame>
  <img src="https://mintcdn.com/kuraaiinc/th72dn9VxhWd2b4C/images/variables_tab.png?fit=max&auto=format&n=th72dn9VxhWd2b4C&q=85&s=7a2f6a985ce7bc02d0730fd287b80094" width="400" alt="Variables tab" data-path="images/variables_tab.png" />
</Frame>

### Referencing Variables

Variables can be referenced to the AI Assistant or directly in prompts using `{variable_name}` syntax.

Note, however that that workflow blocks can only reference variables populated by extraction blocks that are executed prior to the workflow block.

#### Referencing Variables in For Loop Blocks

<Frame>
  <img src="https://mintcdn.com/kuraaiinc/th72dn9VxhWd2b4C/images/for_loop_variable_reference.png?fit=max&auto=format&n=th72dn9VxhWd2b4C&q=85&s=eff20b3f2a04dd52ba2e2f650375f7ed" width="400" alt="For loop variable example" data-path="images/for_loop_variable_reference.png" />
</Frame>

During iteration, use the variable name assigned to the name field in the for loop block to reference the current item in the loop.

* `{item.value}` represents the current item's value
* `{item.key}` represents either:
  * The object property name when iterating over an object
  * The numeric index (0, 1, 2, etc.) when iterating over an array

When these references are used, they will be automatically resolved to their current values during agent execution.