Hey @AndrewC, yes, that exists.
Cloud agents read a file at .cursor/CLOUD.md (inside the .cursor folder at the root of the repo, not a CLOUD.md at the root itself). It is only loaded for cloud agents, so agents in the IDE never see it. That makes it a good home for cloud-only notes: how to start services, how to run tests, and any gotchas on the cloud machine.
The approach in our docs is a section in your root AGENTS.md titled ## Cursor Cloud specific instructions, which cloud agents also pick up: Cloud Environment Setup | Cursor Docs
The difference is that AGENTS.md is read by every agent, IDE included, so anything in that section also lands in your local agents’ context.
A good split: keep the app map (main folders, where key logic lives, conventions) in AGENTS.md, since every agent benefits from it, and put cloud-only setup and testing notes in .cursor/CLOUD.md.
Keep both short and link out to other files for detail. Whatever is in them gets re-read at the start of every run, so a lean file is also cheaper.