Fern

Shipped DDoS protections and multi-language Ask Fern support, alongside the redesigned changelog timeline with tag filtering.

Security hardening rolled out across all docs instances. Adaptive rate limiting, IP-based filtering, request validation, and real-time monitoring now protect both cloud-hosted and self-hosted Fern Docs sites from malicious traffic spikes. Self-hosted users should update to get the protections.

Ask Fern now speaks 15+ languages. The chat interface and document indexing support Spanish, French, German, Japanese, Mandarin, and more. Automatic language detection uses user locale, with per-language model optimization for accuracy.

Changelogs got two layout options and searchable tags. timeline (default) renders compact, date-grouped cards; classic stacks full entries with preserved code formatting and copy buttons. Set site-wide in docs.yml with layout.changelog-layout or override per-changelog in frontmatter. Search queries sync to the ?q= URL parameter for shareable filtered views, and per-entry <ChangelogTags> components let readers filter by topic.

API Explorer loads 40% faster with optimized payload handling and caching. Webhook reference pages gained request/response examples and improved schema visualization.

Search analytics now show query context and result interactions. See which pages users were on when they searched and which results they clicked. Redirect and slug handling improved for localized docs — redirects validate against available locales, locale-specific slugs are configurable, and resolution works across locale boundaries.

The fern-docs agent skill shipped for Claude Code, Cursor, and Copilot. Docs sites can serve author-supplied Agent Skills at /.well-known/skills/, with an install button for any page action bar.