> For the complete documentation index, see [llms.txt](https://docs.stackai.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.stackai.com/stackai-tools/workflow-and-catalog-tools/execute-stackai-project.md).

# Execute StackAI Project

Run an existing StackAI project from another workflow or agent. Use it to reuse a process instead of rebuilding the same steps in several places.

## Before you start

You need access to the target project and a usable configuration for the inputs it expects.

## Call another project

1. Select the target **Project**. It must accept the text input used by this action through `in-0`.
2. Pass one or more strings in **Input Data**. Leave **Loop Mode** off to process only the first item, or enable it to run the project for each item.
3. Run the action and inspect the entries in **Results** before mapping a value to the next step.

**Result:** **Results** contains the response from each project execution that returned a result.

## Behavior and troubleshooting

The action cannot call the project that contains it. It sends each input string to `in-0`; it is not a general mapping interface for every possible input field. Processing several items creates several project executions, so check the volume before enabling Loop Mode.

## Inputs

| Field                 | Parameter    | Description                                                                                 |
| --------------------- | ------------ | ------------------------------------------------------------------------------------------- |
| Input Data (required) | `input_data` | Input data for the project execution as a list, with multiple items if loop mode is enabled |

## Configuration

| Field              | Parameter    | Description                                                                                          |
| ------------------ | ------------ | ---------------------------------------------------------------------------------------------------- |
| Project (required) | `project_id` | The StackAI Project to execute                                                                       |
| Loop Mode          | `loop_mode`  | If enabled, input will be treated as a list and project will execute for each item Default: `false`. |

## Outputs

| Field   | Parameter | Description                                |
| ------- | --------- | ------------------------------------------ |
| Results | `results` | Results from the StackAI Project execution |

## Related guidance

[Action Inputs, Outputs, and Validation](/technical-reference/connections-and-tool-execution/action-inputs-outputs-and-validation.md)


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