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# Discover What is here, and where?

Classic-web analog: sitemap, .well-known

How an agent learns that a resource, tool or agent exists at an origin, and where to find its description.

- [Agent Directory Service](/protocols/ads/) ADS

- [Agent Discovery Protocol](/protocols/adp/) ADP

- [Agent Identity and Discovery](/protocols/aid/) AID

- [Agent Registration and Discovery Protocol](/protocols/ardp/) ARDP

- [Agentic Resource Discovery](/protocols/ard/) ARD [AI Catalog well-known file](/protocols/ai-catalog-well-known-file/)

- [agents.txt](/protocols/agents-txt/)

- [api-catalog: A Well-Known URI and Link Relation to Help Discovery of APIs](/protocols/api-catalog-rfc9727/) RFC 9727

- [DNS for AI Discovery](/protocols/dns-aid/) DNS-AID

- [DNS-Based Agent Naming](/protocols/dan/) DAN

- [LMOS (Language Model Operating System)](/protocols/lmos/) LMOS

- [Open Agentic Schema Framework](/protocols/oasf/) OASF

## Terms
- [Agent Card](/terms/agent-card/)
- [Agentmap directive](/terms/agentmap/)
- [MCP Server Card](/terms/server-card/)
- [Well-known URI](/terms/well-known/)