The Agent standards card on Site check lists files that tell AI agents what your site offers and how they may use it. Its heading counts what was found, for example 2 of 5 found, and each row reads Found or Not found.
None of them is required. A file that is not found is never shown as an error.
| Standard | What it is | Where we look |
|---|---|---|
| llms.txt | A markdown file that tells AI tools what the site is and where its key pages are. | /llms.txt |
| MCP | A server card that lets an AI agent find the site's tools and data. | /.well-known/mcp/server-card.json or /.well-known/mcp.json |
| A2A | An agent card that tells other agents what this site's agent can do and how to reach it. | /.well-known/agent-card.json or /.well-known/agent.json |
| OAuth discovery | Documents that tell an agent how to sign in to the site's API. | /.well-known/oauth-authorization-server or /.well-known/oauth-protected-resource |
| Content Signals | A Content-Signal line in robots.txt that says whether the content may be used for search, AI input and AI training. | /robots.txt |
Hover the "?" on a row to see what was found or where we looked. For Content Signals, the row shows the values it read, such as search=yes, ai-train=no.
What to do next
Most sites only need llms.txt and, if you have a view on AI training, Content Signals. The other three matter when you offer an API or an agent of your own. The card updates on the next site check.