Right now, this should be https://github.com/matrix-org/matrix-public-archive but after #219 is fixed, this could be simply https://archive.matrix.org

It might also be included in the user avatar as well if some platform fails to forward the display name.

The top of the web page and the readme should link to the FAQ that answers something like

Why did @archive:matrix.org join my room?

Background

Certain communities have a policy about only allowing bots that identify themselves, share their source code and the result of their activities. Some ask that bots respond to !botlist, !rollcall or if the bot is @-mentioned.

• https://tilde.chat/wiki/bots
• https://rfc.tildeverse.org/rfcs/2

Alternatives

This could be achieved in multiple ways. The least intrusive of which is to make it trivial to find information about the bot, such as running it under its own subdomain & domain with information about it. The second best is what I suggested above.

Another possibility is vocally announcing itself after joining, but some may actually find that creepier and more intrusive.