feat(seo): noindex LLM text endpoints - #92
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The plain-text mirrors of the docs were competing with the HTML pages they duplicate: /llms-full.txt alone earned 37,527 Search impressions (18% of the site's total) at position 17.9 with a 0.03% CTR, which drags the whole site's CTR baseline down and puts a raw text dump in front of human searchers. Send X-Robots-Tag: noindex on every alternate-format endpoint: /llms.txt and its per-section copies plus /AGENTS.md via headers() in next.config.mjs, and /llms-full.txt plus the /llms.mdx route (which also backs every .md-suffixed docs URL) from the route handlers that build those responses. Crawling is untouched: robots.txt still allows everything, so agents fetch these as before and only indexing is suppressed. Header matching happens on the requested path, so the homepage keeps its own headers when middleware rewrites it to /AGENTS.md for markdown clients. No HTML page gets noindex.
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Problem
The plain-text mirrors of the docs are ranking against the HTML pages they duplicate. Search Console shows
/llms-full.txtwith 37,527 impressions (18% of the site's total) at average position 17.9 and a 0.03% CTR: a raw text dump shown to human searchers, dragging the site-wide CTR baseline down.Change
X-Robots-Tag: noindexon every alternate-format endpoint, using whichever mechanism owns the response:/llms.txtand per-section*/llms.txtheaders()innext.config.mjs(static files inpublic/)/AGENTS.mdheaders()innext.config.mjs/llms-full.txtapp/llms-full.txt/route.ts)/llms.mdx/*and every.md-suffixed docs URLapp/llms.mdx/[[...slug]]/route.ts), which middleware rewrites.mdURLs intoCrawling is untouched:
robots.txtstill allows everything and noDisallowwas added, so agents keep fetching these exactly as before. Only indexing is suppressed./AGENTS.mdgets its header fromnext.config.mjsrather than from its route handler on purpose. Middleware rewrites/to/AGENTS.mdfor markdown and programmatic clients, and header matching happens on the requested path, so the homepage keeps its own headers instead of inheritingnoindex. No HTML page is noindexed.Test evidence
TDD: the two new header assertions in
tests/e2e/llm-endpoints.test.tsfailed first (x-robots-tagwasnull), then passed after the implementation. A third test pins the homepage as indexable even when it negotiates markdown.bun test tests/e2e/llm-endpoints.test.ts: 14 pass, 0 failbun test(full suite): 230 pass, 0 failbun run lintclean,bun run typecheckcleanManual probe against
next devwith the generatedllms.txtfiles present: