AI features

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.

Find answers

Your users can ask a question instead of searching for one. Ask Fern answers with citations from your documentation, in your docs, in Slack, or in your own product through the API. Developers reach the same content from the agent they code with.

Build your docs with AI

You can hand your docs to an agent. Fern Agent writes them from inside Fern, opening a pull request with the change you describe, either on request or on a schedule you set. The coding agent you already use writes them too, once Fern’s skill and MCP server teach it how Fern Docs sites are built. Fern also generates realistic API examples from your spec.

Optimize for AI

Your site is automatically optimized for AI tools and search engines. Fern hosts an llms.txt file, serves Markdown instead of HTML to AI agents, and exposes a standards-based API catalog, so agents index and process your content with fewer tokens.

These files are generated from your content without calling a model. Your robots.txt controls whether third-party tools can crawl or train on them.

Data and controls

Only the content a feature needs reaches a model:

• Ask Fern sends the conversation and the documentation passages the viewer is allowed to read. Fern stores queries for analytics.
• AI-generated examples send the relevant part of your API definition.
• Fern Agent sends your request and keeps it only during the session.

Fern doesn’t use your documentation content, your code, or your end users’ queries to train AI models.