Night Duty

What This Skill Does

Mac utility skill with three modes:

• caffeinate — keeps the Mac awake indefinitely (prevents sleep)
• blind — dims screen to zero, say "restore" to bring it back to ~50%. Keyboard backlight must be dimmed manually (F5 key)
• night duty — asks which of the two (or both) and executes

Detecting the Mode

Determine mode from the user's message:

• If the message contains "caffeinate" (and NOT "night duty") → run Caffeinate Mode directly
• If the message contains "blind" (and NOT "night duty") → run Blind Mode directly
• If the message contains "night duty" → run Night Duty Mode (interactive)

Caffeinate Mode

Run this bash command in the background:

caffeinate -dis &
CAFFEINE_PID=$!
echo $CAFFEINE_PID > /tmp/caffeinate.pid
# Start hourly watcher (no --wait-blind since this is caffeinate-only)
nohup /Users/sarthak/Claude/.claude/scripts/night-duty/watcher.sh > /dev/null 2>&1 &
echo $! > /tmp/night-duty-watcher.pid
echo "Caffeinate running (PID: $CAFFEINE_PID). Hourly reminders active."

Use run_in_background: true on the Bash tool so it doesn't block.

Tell the user:

• Mac will stay awake until they say "stop caffeinate" or "kill caffeinate"
• They'll get a macOS notification every hour as a reminder

Blind Mode

Two-step process: dim now, restore when user says "restore".

Step 1 — Dim screen:

osascript -e '
tell application "System Events"
    repeat 50 times
        key code 145
        delay 0.03
    end repeat
end tell' && touch /tmp/night-duty-blind && echo "Screen dimmed to zero."

Tell the user: "Screen dimmed. Dim your keyboard manually (F5 key). Say 'restore' when you want brightness back."

Step 2 — Restore (when user says "restore", "unblind", or "lights on"):

osascript -e '
tell application "System Events"
    repeat 8 times
        key code 144
        delay 0.05
    end repeat
end tell' && rm -f /tmp/night-duty-blind && echo "Brightness restored to ~50%."

Night Duty Mode (Interactive)

Ask the user: "Night duty activated. What do you need?"

• Caffeinate — keep Mac awake
• Blind — dim screen to zero
• Both — caffeinate + blind

Then execute the chosen mode(s). If both:

1. Run caffeinate with the blind-aware watcher:

caffeinate -dis &
CAFFEINE_PID=$!
echo $CAFFEINE_PID > /tmp/caffeinate.pid
touch /tmp/night-duty-blind
# Start watcher in --wait-blind mode (waits for keypress restore before counting hours)
nohup /Users/sarthak/Claude/.claude/scripts/night-duty/watcher.sh --wait-blind > /dev/null 2>&1 &
echo $! > /tmp/night-duty-watcher.pid
echo "Caffeinate running (PID: $CAFFEINE_PID). Hourly reminders start after screen restores."

2. Then run blind mode (the rm -f /tmp/night-duty-blind in the restore step signals the watcher to start counting).

Stopping Caffeinate

If the user says "stop caffeinate", "kill caffeinate", or "stop night duty":

kill $(cat /tmp/caffeinate.pid) 2>/dev/null && rm -f /tmp/caffeinate.pid
kill $(cat /tmp/night-duty-watcher.pid) 2>/dev/null && rm -f /tmp/night-duty-watcher.pid
rm -f /tmp/night-duty-blind
echo "Night duty fully stopped."

Notes

• Key code 145 = screen brightness down, key code 144 = screen brightness up (macOS system keys)
• 50 repeats for dimming ensures we hit absolute zero from any starting brightness
• 8 repeats for screen restore brings it to ~50% — user can adjust from there
• Keyboard backlight cannot be controlled programmatically on this Mac — user must dim manually via F5 key
• caffeinate flags: -d (prevent display sleep), -i (prevent idle sleep), -s (prevent system sleep)
• Blind mode is two-step: dim immediately, restore when user says "restore"/"unblind"/"lights on"
• Do NOT ask for confirmation before running bash commands — just execute