Document automation site scope and run-history outcomes

[fern-api]

Fern Agent automations can now be limited to specific docs sites, keeping recurring work within the intended product sites and repositories. This helps teams manage portals where multiple sites share a hostname but use separate repositories. Run history also shows each run's outcome and every pull request it opened, making multi-repository changes easier to review.

Implements docs for: feat(fai): scope docs automations to docs sites and surface run outcomes (fern-api/fern-platform#14803)

Summary

• Fern Agent → Automations (fern/products/docs/pages/ai/fern-agent.mdx): Document when Docs sites appears, registered site URLs, the all-sites default, chat-based scoping, and changing an existing automation's scope. Explain that scoped runs can read and edit only the selected sites and open pull requests only in their repositories. Document the Docs sites, Status, and Pull requests columns, the actual Successful badge label, and PR labels such as owner/name#123.
• Docs changelog, October 1 (fern/products/docs/pages/changelog/2026-10-01.mdx): Summarize site scope and multi-repository run history. Retain the ai tag and the verified /learn/docs/ai-features/fern-agent#automations link.

Validation

• Reviewed the merged source PR diff and surrounding implementation.
• pre-commit run --files …: passed. No new Vale alerts compared with main; the Fern Agent page's 16 existing alerts remain unchanged. The changelog has no Vale alerts.
• npx --yes fern-api@5.100.0 check --warnings: 0 errors, 11 warnings in untouched configuration/content. The redirect check was skipped because FDR returned 403.
• git diff --check: passed.

Link to Devin session: https://app.devin.ai/sessions/531622c9b58541f9af32553f4f3963ab
Open in Devin Desktop: https://app.devin.ai/desktop/session/531622c9b58541f9af32553f4f3963ab?variant=devin

[github-actions]

🌿 Preview your docs: https://fern-preview-2026-10-01-fern-ai-1fb7a4-30ba9f29.docs.buildwithfern.com/learn

Here are the markdown pages you've updated:

• learn/docs/ai-features/fern-agent
• learn/docs/changelog/2026/10/1