> ## Documentation index
> Fetch the complete documentation index at: https://arize.com/llms.txt
> Ask it with GET https://arize.com/ask?q=<keywords or question>. Short keywords rank best.
> Use these to discover all available pages before exploring further.

# Instructor

> Instructor is a library that helps you define structured output formats for LLMs.

<Card title="Instructor" href="https://python.useinstructor.com/" icon="globe" horizontal>
  [](https://python.useinstructor.com/)
</Card>

<Columns cols={2}>
  <Card img="https://storage.googleapis.com/arize-phoenix-assets/assets/images/phoenix-docs-images/7756bbf9-image.jpeg" horizontal title="Instructor Tracing" href="/docs/phoenix/integrations/python/instructor/instructor-tracing"/>
</Columns>