KeyLang is a local macOS helper that runs in the user's login session. It registers fixed global hotkeys and switches macOS input sources.

It does not:

• install a keyboard event tap
• request Accessibility permission
• request Input Monitoring permission
• read arbitrary keypresses
• send network requests
• run with elevated privileges

It does:

• compile a Swift helper locally
• create a background .app bundle in the repository directory
• install a user LaunchAgent at ~/Library/LaunchAgents/io.github.keylang.keylang.plist
• write logs to ~/Library/Logs/keylang.*.log

Before installing, inspect:

• Sources/KeyLang.swift
• install-keylang.sh
• uninstall-keylang.sh

The expected sensitive APIs are:

• RegisterEventHotKey
• TISSelectInputSource
• CGEventSource.flagsState

CGEventSource.flagsState is used only to wait until shortcut modifier keys are released before changing input source. The project should not use CGEvent.tapCreate unless future maintainers explicitly document a broader permission model.

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