docs: agent 404 responses now list up to five similar pages - #7010
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Summary
When an AI agent requests a
.md/.mdxURL that matches no page and no redirect, Fern's 404 response includes a## Similar pagessection so the agent can recover by following a suggested link. That section now lists up to five suggestions instead of three, because three was often too few on large sites for the right page to appear.Implements docs for: feat(docs): return up to five similar-page suggestions for missing markdown pages (fern-api/fern-platform#14850) — https://github.com/fern-api/fern-platform/pull/14850
Implements docs for: feat(docs): return up to five similar-page suggestions for missing markdown pages (fern-api/fern-platform#14853, follow-up) — https://github.com/fern-api/fern-platform/pull/14853
Pages changed
fern/products/docs/pages/ai/markdown.mdx: "up to three suggested pages" → "up to five suggested pages" in the missing-pages section.fern/products/docs/pages/changelog/2026-09-18.mdx: new Docs changelog entry (tagai) linking to/learn/docs/ai-features/markdown#missing-pages.The 2026-07-07 changelog entry that announced the original three suggestions is left as-is (historical record).
Checks
pre-commit run --files <changed files>: Vale passed, 0 errors/warnings/suggestions.cd fern && npx --yes fern-api@5.59.0 check --warnings: 0 errors; 11 preexisting warnings unrelated to this change.Link to Devin session: https://app.devin.ai/sessions/93044671336d46acaaede2eb11572b66
Open in Devin Desktop: https://app.devin.ai/desktop/session/93044671336d46acaaede2eb11572b66?variant=devin