When I start a longer Codex task, I tend to go and do something else. I did not want to keep checking the VS Code sidebar to see whether it had finished, so I made my desk lamp flash instead.
What happens
When Codex finishes a turn, its notify hook runs a local PowerShell script. The script talks to the Hue Bridge on my network and makes one lamp flash red three times.
Codex finishes a turn
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Codex notify hook
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PowerShell script
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Hue Bridge API
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Desk lamp flashesThe lamp flashing when Codex finishes a task.
Why I made it
It is unnecessary, but useful. A light in the room is less distracting than another sound, badge, or popup, and it means I can stop watching the progress indicator.
There is no cloud service or custom extension involved. Codex emits an event, PowerShell runs a script, and the Hue Bridge gets a request. Every piece is easy to replace.
Possible next bits
Codex currently gives me one useful event: agent-turn-complete. If more hooks arrive, I could use colours for success and errors, show a busy state, trigger more lamps, or restore the previous light state afterwards.
For now, it tells me one thing clearly: task done.
The script and setup notes are on GitHub.