Discovery & Declaration

how a site announces itself to agents

6 of 28 The Agent Protocol Atlas

• llms.txt A markdown file at the domain root that gives language models a curated map of a site's most important content.
• NLWeb Turns a website into a conversational, queryable endpoint by combining Schema.org data, a vector store and an LLM — and every NLWeb endpoint is also an MCP server.
• agents.json A manifest that describes a site's APIs and workflows in a form agents can discover and execute, typically served from /.well-known/.
• agents.txt A root-level file that declares a site's identity, terms of use for AI agents, service catalog and agentic endpoints in a machine-readable form.
• DNS-AID Lets organizations publish and discover AI agents through standard DNS records — a naming convention over SVCB/TXT/TLSA records, signed with DNSSEC, with no new record types or servers.
• schema.org The shared structured-data vocabulary (JSON-LD) that gives agents machine-readable entities and relationships to read off a page — the noun layer the agentic web is built on.

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