Explore code to write technical documentation
A technical writer uses Devin to explore code before documenting it, plus a Slack writing agent built on Devin, reporting about 20,000 lines of docs per month.
Done withDevin
- What they did
- Fern's only technical writer, Devin Logan, uses the Devin AI engineer, which already has context on all of Fern's repos, to explore code before writing. She also tags Fern Writer, a Slack agent built on Devin, with an engineering thread, and it opens a PR with drafted pages, reorganized content and redirects. She then pulls the branch and iterates locally with Claude Code.
- How it went
- She reports about 20,000 new lines of docs per month across roughly 500 pages. She reviews and edits every page, often heavily. Fern Writer's first drafts sometimes got the structure wrong or skipped a changelog entry.
- Worth knowing
- Engineer review still mattered: in one rewrite of the authentication docs, the engineer found the conceptual framing wrong, which forced a restructure.
Try it yourself with Devin
Explore the code in [path or module] and write technical documentation for [feature or API] aimed at [audience, e.g. new developers]. Cover what it does, how to set it up, the main functions or endpoints with examples, and common pitfalls, and mark anything you're unsure about so I can verify it. Save the result as [file name] and show me the draft before committing anything.
Source: buildwithfern.com · Mar 10, 2026
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