The /llms.txt Specification v2 for Web-Browsing AI Agents

LinkJeremy HowardResource

Jeremy Howard presents version 2 of the /llms.txt proposal, specifying how websites can provide structured Markdown overviews and direct links so AI agents can navigate content efficiently.

Key points

  1. Defines a Markdown-formatted llms.txt file located at the site root or specific subpaths to guide LLMs and coding agents.
  2. Proposes serving clean Markdown counterparts of web pages via .md extensions, referenced through rel="alternate" and rel="describedby" link relations.
  3. Complements robots.txt and sitemap.xml by focusing on on-demand inference and token conservation rather than crawler permissions.
  4. Reflects two years of adoption, with integration into documentation tools, CMS plugins, and Chrome Lighthouse agentic checks.

Why it matters

Raw HTML layouts waste model context with boilerplate, ads, and JavaScript. As AI agents increasingly browse the live web to fetch technical documentation or business facts, llms.txt establishes a lightweight, vendor-neutral standard to deliver concise context directly.

Analysis

Choosing Markdown over formats like XML or JSON allows direct consumption by LLMs while maintaining strict structural parsing rules. The path-based approach solves deployment constraints on shared hosts (such as GitHub Pages) where RFC 8615 well-known endpoints are inaccessible. Broad ecosystem adoption across platforms like GitBook, Mintlify, and WordPress demonstrates strong momentum for agent-first web standards.

Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.

Similar in content, found by the AI search.

  • Link:agentwikis.com

    Agent Wikis: Maintained Knowledge Bases for Humans and AI Agents

    Agent Wikis transforms fast-moving information sources such as repositories, changelogs, transcripts, and community Q&A into structured Markdown knowledge bases. Designed for both humans and AI agents, the content is accessible via an llms.txt entry point.

    AI & LLMs· Resource

  • Link:specification.website

    The Website Specification: Open Reference for Modern Web Standards and Best Practices

    The Website Specification (specification.website) is a platform-agnostic, open-source guide licensed under MIT, detailing the technical features a good website should implement. It spans HTML foundations, SEO, accessibility, security, and agent readiness, offering direct Markdown access, an MCP server, and an Agent Skill.

    Web development· Resource

  • Link:Anthropic

    Agent Skills: An Open Standard for Modular AI Agent Capabilities

    Agent Skills is an open format designed to equip AI agents with specialised domain knowledge and repeatable workflows. Centred around a directory containing a SKILL.md file, it relies on progressive disclosure to keep context overhead minimal.

    AI & LLMs· Resource

  • Article:Google Chrome Developers Team

    Lighthouse Introduces Experimental Audits for Agentic Browsing

    Google has documented an experimental Lighthouse category designed to evaluate how well websites interact with autonomous AI agents, using pass/fail checks rather than a 0-100 score.

    AI & LLMs· Resource

  • Repository:Podcast72/showroom-la-finestra-webmcp

    WebMCP: In-Browser Agent Interface Layer via document.modelContext

    The showroom-la-finestra-webmcp repository demonstrates how existing websites can expose structured business knowledge and safe actions directly to AI agents without running a separate MCP server. By using an in-browser layer via `document.modelContext`, the website explains itself rather than relying on DOM scraping.

    1starsJavaScript

    AI & LLMs· Resource

  • Link:Joost de Valk

    The Future of the Website: Interface Bundles and Verifiable Home Bases

    Joost de Valk explores the evolution of websites in the age of AI agents. Rather than disappearing, websites are shifting from human-only HTML pages into canonical systems of record. They must serve as interface bundles—including protocols like MCP—that allow automated agents to read data and take actions, while verifiable authenticity remains the only lasting competitive moat.

    AI & LLMs· Opinion

Let's talk about your project

Locations

  • Mattersburg
    Johann Nepomuk Bergerstraße 7/2/14
    7210 Mattersburg, Austria
  • Vienna
    Ungargasse 64-66/3/404
    1030 Wien, Austria

Parts of this content were created with the assistance of AI.