cmux-socket-policy

# cmux Socket Policy ## Threading policy - Do not use `DispatchQueue.main.sync` for high-frequency socket telemetry commands such as `report_*`, `ports_kick`, status/progress updates, or log metadata updates. - For telemetry hot paths, parse and validate arguments off-main. - Dedupe and coalesce off-main first. - Schedule minimal UI/model mutation with `DispatchQueue.main.async` only when needed. - Commands that directly manipulate AppKit/Ghostty UI state are allowed to run on the main actor. - If adding a new socket command, default to off-main handling and require an explicit reason in code comments when main-thread execution is necessary. ## Focus policy - Socket/CLI commands must not steal macOS app focus. - Do not activate the app or raise windows unless the command has explicit focus intent. - Only explicit focus-intent commands may mutate in-app focus/selection. - Explicit focus-intent commands include `window.focus`, `workspace.select/next/previous/last`, `surface.focus`, `pane.focus/last`, browser focus commands, and v1 focus equivalents. - All non-focus commands should preserve the current user focus context while still applying data/model changes. ## Detailed reference - Read [references/threading-and-focus.md](references/threading-and-focus.md) when adding a command, changing command execution context, or deciding whether focus changes are allowed.