What is llms.txt?

MCP and AI agents glossary · 1 primary source

A proposed Markdown file at /llms.txt that gives AI models a short, curated map of a website: a title, a one-paragraph summary and lists of key links.

Proposed by Jeremy Howard in September 2024. The only required part is an H1 with the site or project name; then an optional blockquote summary, optional detail paragraphs, and H2 sections of [name](url): notes link lists. An H2 named "Optional" marks links an agent can skip when it needs a shorter context.

The proposal also suggests serving clean Markdown versions of important pages at the same URL with .md added. Some sites also publish a longer /llms-full.txt with full text.

Sources

llmstxt.org

Related terms

Agent card (A2A)A JSON document, served at /.well-known/agent-card.json, that describes an AI agent for the Agent2Agent (A2A) protocol: its name, skills, interfaces, capabilities and authentication.
Model Context Protocol (MCP)An open protocol, introduced by Anthropic in November 2024, that lets AI applications connect to external tools and data through a standard interface.

On this site

All mcp and ai agents terms · Full glossary

Free: the Free API Starter Kit

Copy-paste calls for 4 APIs with free daily tiers (CVE priority, VIN recalls, US duty rates, email checks), then 5 short emails on KEV/EPSS, MCP and free data.