Mark
System-wide UI annotation for coding agents — press a hotkey, click anything, type a note.
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Annotate anything on screen: press the hotkey, click an element, type a note, send. The annotation (note + element info + screenshots) reaches your coding agent as a sentinel it can resolve into full context.
Apple frameworks only, no dependencies. A background daemon (markd) handles hotkeys and capture; a CLI (mark) controls everything and serves an MCP server. Pair with a Cloudflare hub to deliver annotations to remote agents.