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

# Create and operate a Reactor

> Listen to Slack messages with inclusion and exclusion rules, run Ellie instructions, and govern connected actions.

Reactors watch for a condition and run a configured action when it occurs.

## Create a Reactor

1. Choose the signal to watch.
2. Add filters so it fires only for the intended teams, repositories, or severity.
3. Select the action and destination.
4. Test it with a narrow scope before enabling it broadly.

## Good first uses

* Alert a channel when a critical review or incident needs attention.
* Notify an owner when a delivery threshold is crossed.
* Start a follow-up workflow when a recurring production pattern appears.

<Warning>
  Avoid broad conditions paired with high-volume destinations. Test with one repository or team first.
</Warning>