***

title: AI features
description: >-
Fern AI features help users find answers instantly, automate content updates,
and optimize documentation for AI tools with llms.txt support.
--------------------------------------------------------------

For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see [https://buildwithfern.com/learn/llms.txt](https://buildwithfern.com/learn/llms.txt). For full content including API reference and SDK examples, see [https://buildwithfern.com/learn/llms-full.txt](https://buildwithfern.com/learn/llms-full.txt).

Your documentation site comes with automatic optimizations for AI tools, plus features you can install to help users find answers and keep your content up to date.

<Anchor id="ai-credits">
  <Tip title="AI credits">
    AI features are usage-based and consume credits. Every [plan](https://buildwithfern.com/pricing) includes a monthly credit allowance: Hobby plans get 250 credits, Pro plans get 1,000 credits, and Enterprise plans get a custom amount.

    | Feature               | Credits               |
    | --------------------- | --------------------- |
    | Ask Fern              | 2 credits per message |
    | AI-generated examples | 1 credit              |
    | Fern Writer session   | 50 credits            |
  </Tip>
</Anchor>

## Find answers

Users can chat with Ask Fern to get instant answers from your documentation. It's available as an embedded chat widget, via the [API](/learn/docs/ai-features/ask-fern/api-reference/overview) for custom integrations, and as a [Slack app](/learn/docs/ai-features/ask-fern/slack-app) or [Discord bot](/learn/docs/ai-features/ask-fern/discord-bot) for your community workspace. Ask Fern understands context and provides citations so users can verify information and explore further.

<CardGroup cols={3}>
  <Card title="Ask Fern overview" icon="sparkles" href="/learn/docs/ai-features/ask-fern/overview" />

  <Card title="Ask Fern Slack app" icon="fa-brands fa-slack" href="/learn/docs/ai-features/ask-fern/slack-app" />

  <Card title="Ask Fern Discord bot" icon="fa-brands fa-discord" href="/learn/docs/ai-features/ask-fern/discord-bot" />
</CardGroup>

## Create and update content

AI helps keep your documentation current. Fern Writer is a Slack-based technical writing agent that creates pull requests with targeted edits when you tag `@Fern Writer` to request updates. For API Reference docs, Fern automatically generates realistic examples from your OpenAPI spec that stay synchronized with spec changes, replacing placeholder values like `"string"` with believable data.

<CardGroup cols={2}>
  <Card title="Fern Writer" icon="pen-line" href="/learn/docs/ai-features/fern-writer" />

  <Card title="AI-generated examples" icon="brackets-curly" href="/learn/docs/ai-features/ai-examples" />
</CardGroup>

## Optimize for AI

Your site is automatically optimized for AI tools and search engines. Fern serves Markdown instead of HTML to AI agents, reducing token consumption and helping these tools process your content faster. Your site hosts `llms.txt` and `llms-full.txt` files so LLMs can index your documentation efficiently.

<CardGroup cols={2}>
  <Card title="llms.txt" icon="file-text" href="/learn/docs/ai-features/llms-txt" />
</CardGroup>