citelayer® — AI Visibility for WordPress (Free)
citelayer® makes your WordPress site readable by AI agents — automatically. The free plugin generates a standards-compliant llms.txt file, adds Schema.org markup optimized for large language models, and serves Markdown instead of HTML to AI crawlers, reducing token consumption by up to 80%. Zero configuration required. AI-ready in under 5 minutes.
Automatic schema markup for all your content
llms.txt generation — structured for AI consumption
Compatible with 8 SEO plugins including Rank Math and Yoast
Free and open source — 100% GPL licensed
The web is changing. AI agents are the new search.
ChatGPT, Gemini, Claude, and Perplexity don’t crawl your site the way Google does. They process structured context — and if your site isn’t structured for them, you’re invisible to the fastest-growing discovery channel on the web.
citelayer® is a WordPress plugin built specifically for this shift. It implements the emerging standards that AI agents use to understand websites: llms.txt, Schema.org markup tuned for language models, content negotiation for Markdown delivery, and content signal headers per the contentsignals.org specification.
What citelayer® Free does — and why it matters
llms.txt Generation (Automatic)
The llms.txt file is a machine-readable index that tells AI agents what your site contains, how it’s structured, and what content is available for them to process. citelayer® generates and maintains this file automatically — no manual editing, no custom templates. Think of it as a robots.txt, but for language models rather than traditional crawlers.
Schema.org Markup Optimized for LLMs
Standard Schema.org implementations are designed for Google’s structured data parsers. citelayer® adds and extends Organization, WebSite, Article, and Product schemas specifically to maximize semantic clarity for language models — the entities that need to understand what your business is before they can recommend it.
Markdown for Agents (Content Negotiation)
When an AI agent requests a page, citelayer® detects the request and serves a clean Markdown version instead of your full HTML. This eliminates navigation markup, sidebars, footers, and presentational code — reducing token consumption by up to 80%. Less noise means faster, more accurate comprehension by the model.
Basic UCP Discovery Endpoint
The Universal Commerce Protocol (UCP) is an open standard, developed with input from Google, that allows AI agents to programmatically browse and interact with online shops. citelayer® Free publishes a UCP discovery endpoint that signals to AI agents that this site is UCP-capable.
AI Readability Score (Dashboard Widget)
Your WordPress dashboard gets a new widget that scores how well your site is currently structured for AI consumption. The score is based on concrete signals: presence of llms.txt, schema coverage, content signal headers, and Markdown availability.
Content-Signal Headers
citelayer® adds HTTP response headers aligned with the contentsignals.org specification. These headers communicate content type, language, freshness, and licensing information to AI agents at the HTTP layer.
Compatible with 8 Major SEO Plugins
citelayer® works alongside Rank Math, Yoast SEO, AIOSEO, SEOPress, The SEO Framework, Slim SEO, and more. It reads existing schema output from these plugins and extends it — no conflicts, no duplicate markup.
Built by a practitioner, not a marketing team
citelayer® was developed by Saskia Teichmann, a WordPress developer since 2009 and WooCommerce developer since 2012. The plugin implements real standards — llms.txt (Anthropic/Answer.AI), Schema.org, UCP, contentsignals.org — not proprietary formats. The free plugin is open source. The architecture is documented.