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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.8 15 Jan 2026

macOS Sleep Prevention

What

Claude Code now automatically prevents macOS from sleeping during long-running operations.

Usage: Automatic—no user action required.

Details

Uses macOS caffeinate -i command to prevent idle sleep
Active only during operations that need it (reference-counted)
Automatically restarts caffeinate every 4 minutes to maintain prevention during very long tasks
Properly cleans up on session exit
Only applies to macOS; no effect on other platforms

Evidence

OW9() at line 517291 (caffeinate, -i, -t, "Started caffeinate to prevent sleep")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.8 →