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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 v2.1.221 3 Aug 2026

Spare background job is rebooted when defaults change

You'll notice

Useful3 Signal0

Sessions

Fixes background jobs starting with stale settings by rebooting the pre-warmed spare when defaults change.

What

A pre-warmed spare job is no longer reused when it was started with different defaults from the ones now requested.

Details

the spare's defaults are compared to the requested ones before reuse
on mismatch the spare is torn down and defaults_mismatch_reboot is recorded under job_spare_ensure

Evidence

defaults_mismatch_reboot

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

See this entry in the whole of v2.1.221 →