# Filters

FeedOtter uses the TWIG template language in our email code.  As a result many common patterns and template operators are allowed.

Here are the most common filters used in FeedOtter emails:

{% content-ref url="/pages/6Brheuo3PsXFiCyIM1m9" %}
[Broken mention](broken://pages/6Brheuo3PsXFiCyIM1m9)
{% endcontent-ref %}

{% content-ref url="/pages/rpnXKLr1oGH6aEoPw6lA" %}
[Broken mention](broken://pages/rpnXKLr1oGH6aEoPw6lA)
{% endcontent-ref %}

{% content-ref url="/pages/p73G0mjsrTZT2roH4JM5" %}
[Broken mention](broken://pages/p73G0mjsrTZT2roH4JM5)
{% endcontent-ref %}

In addition to these special filters, most anything allowed in the TWIG language can be used in FeedOtter email templates.  Check out the TWIG documentation for more ideas.

{% embed url="<https://twig.symfony.com/doc/3.x/>" %}


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.feedotter.com/set-up-your-own-template/advanced-template-information/filters.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.