[BUG] Claude desktop app holds NoIdleSleepAssertion indefinitely, preventing macOS idle sleep

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Platform: macOS 15.6.1 (Sequoia)

Describe the bug:
The Claude desktop app (Electron) holds a NoIdleSleepAssertion power assertion
indefinitely, preventing the Mac from sleeping when idle. The assertion is never
released until the app is quit.

To reproduce:

1. Open Claude desktop app
2. Leave it open for several hours without quitting
3. Run: pmset -g assertions
4. Observe pid <N>(Claude): NoIdleSleepAssertion named: "Electron" with a

multi-hour elapsed time

Expected: The assertion should be released when Claude is idle / not
actively processing.

Actual: The assertion persists indefinitely (observed 48+ hours),
preventing macOS idle sleep.

Workaround: Quit and relaunch Claude to release the assertion.

What Should Happen?

Claude Desktop should not prevent waking from sleep.

Error Messages/Logs

Steps to Reproduce

Diagnosed with Claude via calling

pmset -g assertions

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Sonnet 4.6

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_