llms.txt is a proposed standard — a plain-text file at your site root that gives AI models a clean, curated map of your content, much like robots.txt does for crawlers.
- ▪llms.txt is a proposed robots.txt-for-LLMs: a curated content map at your site root for AI models.
- ▪Solid volume — 2,800/mo — genuinely global (Japan and India rank high).
- ▪But the honest finding: search interest is down ~86% from its mid-2025 peak. The hype cooled.
- ▪KD 50 — the hardest “easy” term here; Ahrefs and Semrush own the explainers (DR 91–92).
- ▪Verdict: publish a solid reference page, but don’t over-invest — this may be a fading standard.
The rare topic where the emergence story and the cooling story are the same story — it surfaced in 2025 as generative search exploded, and it is already fading.
The emergence
Interest was genuinely global — Japan and India rank right behind the US. But the trend is the headline: it peaked above 5,000 searches a month in mid-2025 and has since fallen roughly 86% to the 700s. The volume of adoption blog posts is wildly out of step with actual demand.
The commercial pull
Commercial value is minimal — a $0.80 CPC. Nobody monetizes llms.txt directly; it is technical hygiene, not a purchase decision. The value is reputational, not revenue.
Who’s competing for attention
Dominated, pointedly, by the SEO-tool companies whose own visibility depends on owning AI-search topics — Semrush and Ahrefs have published the canonical explainers. Beating the two largest SEO platforms on an SEO topic is a genuine uphill fight.
Growth or decline
Poor and declining — the defining risk. The volume has fallen off a cliff and the standard remains “proposed,” with no guarantee of adoption. Flagged a clear headwind. Not a page to build a pillar around.
| llms.txt | MCP | |
|---|---|---|
| Trend | ▼ 86% | Maturing up |
| Adoption | Unproven | Cleared the threshold |
| Standard status | Proposed | Widely adopted |
| Invest? | One reference page | A content cluster |
How PPC Snobs executes here
llms.txt is on-brand for our Tagging module — AI-visibility plumbing — but real expertise means judgment. We implement an llms.txt file where it is low-effort and plausibly helps, and tell you honestly that the data says temper the ambition. One excellent implementation-first reference, maintained cheaply.
Publish it, interlink it, monitor the trend. If adoption turns, we’re positioned; if it fades, we spent one page, not a quarter.