LLM-LDThe Open Standard for AI-Readable Websites

Overview ​

LLM-LD (Large Language Model Linked Data) is a specification for structuring your website's information so that AI systems and agents can understand your business. JSON-LD is for search engines. LLM-LD is for AI.

The Problem ​

AI crawlers visit your site every day. They find HTML designed for humans, not machines. They scrape your HTML, parse your nav menus, and try to figure out what your business does. They get it wrong. They miss your services, your locations, your differentiators.

The Solution ​

Structured data tells AI systems exactly what you do, who you serve, where you operate, and what actions to recommend. When someone asks an AI about your industry, it has everything it needs to recommend you accurately and in context.

Three Independent Layers ​

• Layer 1 works if nothing else does. Schema.org markup on your pages using existing standards every crawler already understands.
• Layer 2 adds depth. Entity files that define your people, products, services, and locations plus a knowledge graph showing how they connect.
• Layer 3 is the complete AI experience. A single file at /.well-known/llm-index.json containing everything AI needs.

Minimal Example ​

A minimal llm-index.json for a dental practice:

{
  "@context": ["https://schema.org", "https://llmld.org/v1"],
  "@type": "llmld:AIWebsite",
  "llmld:summary": {
    "one_liner": "Family dental practice in Springfield, IL",
    "key_facts": [
      "Accepting new patients",
      "Open Saturdays",
      "Most insurance accepted"
    ]
  },
  "llmld:actions": {
    "primary": [{"name": "Book Appointment", "url": "https://acmedental.com/book"}]
  }
}

That is it. One file.

Published February 2026 | License: CC BY 4.0 | Maintained by CAPXEL ​