# ECP Directory

This canonical URL serves two first-party representations from the same authority.

- Browsers receive the human submission interface at `https://ecp.directory/`.
- Agents receive this markdown representation from that same canonical URL when the request does not negotiate for HTML.

## What This Surface Is

`ecp.directory` is the public index for sites that pass the Endpoint Context Protocol qualification check.

The check currently verifies three conditions at the submitted canonical URL:

1. Browser requests receive HTML.
2. Agent requests receive AgentWelcome.md or an equivalent non-HTML agent representation.
3. The response varies on `Accept`.

## Submission Rules

- Submission is opt-in.
- The target site must pass preflight before it can be submitted.
- Duplicate submissions are rejected.

## Protocol Notes

This site itself is ECP-enabled.

- Canonical human URL: `https://ecp.directory/`
- Canonical agent URL: `https://ecp.directory/` via HTTP content negotiation
- Direct markdown alias: `https://ecp.directory/AgentWelcome.md`

## Related URLs

- Protocol documentation: `https://endpointcontextprotocol.io/`
- GitHub: `https://github.com/endpointcontextprotocol`