> For the complete documentation index, see [llms.txt](https://docs.ownlayer.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ownlayer.com/monitor/evaluators/smart-trigger-an-online-evaluator.md).
# Smart Trigger an online Evaluator
{% hint style="info" %}
Note that only evaluators with **input** and **output** variables can be triggered for online evaluation in production
{% endhint %}
### Add Trigger Logic
To automatically evaluate an inference, you can add **Triggers** on the Evaluator detail page.
* Select the evaluator you just created.
* Navigate to the 'Triggers' section within the evaluator's detail page, and click on '**Add tag**'
### Implement Trigger in Inference Stream
* Ensure that the tags specified in the evaluators' triggers are included when you stream your inference data.
* Follow the full [API documentation](https://app.ownlayer.com/docs#tag/inferences) for detailed instructions on how to implement triggers in your inference stream.
---
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