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LidAssistant (盒盖助手)

A native macOS menu-bar utility that keeps selected AI work running with the lid closed, then restores normal sleep behavior when the work is done.

Two modes, one clear boundary

• Auto watches supported local task signals. When the lid is closed, active work keeps the Mac awake; after activity ends, the app waits for the configured delay before requesting sleep.
• Manual lets you explicitly choose “sleep on lid close” or “stay awake on lid close.”
• Black-screen energy saver lowers the built-in display brightness while closed-lid work continues, then restores brightness after the lid opens.
• External display guard stops the app from intervening while an external display is connected.
• Crash watchdog restores normal lid-close sleep if the app stops unexpectedly.

Interface

Auto mode	Manual mode

Task signals

LidAssistant inspects local status and recent activity; it does not read or upload prompt text.

Per-process network activity may extend an active state briefly, but does not create a task on its own.

Install

Homebrew

brew install --cask yinshi1226-ai/tap/lidassistant
/Applications/盒盖助手.app/Contents/Resources/grant.sh

The second command is a one-time authorization step. It installs a tightly scoped sudoers rule, the crash watchdog, and launch-at-login support.

Download a release

1. Download LidAssistant.zip from the latest release.
2. Unzip the app into /Applications.
3. Run /Applications/盒盖助手.app/Contents/Resources/grant.sh once.

The release is ad-hoc signed. On first launch, macOS may ask you to confirm it in System Settings → Privacy & Security.

Build from source

git clone https://github.com/yinshi1226-ai/LidAssistant.git
cd LidAssistant
./install.sh

Permissions and privacy

• No telemetry and no advertising SDK.
• The sudoers rule allows only pmset -a disablesleep 0 and pmset -a disablesleep 1.
• Task detection uses timestamps, status fields, and event markers—not prompt content.
• Local diagnostic logs remain on the Mac.
• Authorization and installed support files can be removed with ./uninstall.sh.

See SECURITY.md for the exact files and privilege boundary.

Notes

• Other macOS sleep assertions—such as video calls or media playback—can still delay sleep.
• Non-Harness task detection is based on recent local events and may need tuning if an upstream app changes its log format.
• LidAssistant is intended for Apple silicon Macs running macOS 13 or later.

Development

cd LidAssistant
swift test
swift run LidAssistant --dry-run
./build-app.sh

License

MIT