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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.

← All of v2.1.221 Home All releases ←olderv2.1.220 v2.1.222newer→

Claude Code v2.1.221 3 Aug 2026

Bug hunter runs code-quality checks by default

You'll notice

Useful3 Signal0

Agents Notable not in their notes

Bug hunter now runs a code-quality pass automatically unless you set code_quality to false.

code_qualityBUGHUNTER_CODE_QUALITY

What

Bug hunter runs now enable a code-quality pass unless you turn it off in config.

Details

the bug hunter environment sets BUGHUNTER_CODE_QUALITY: "1" alongside the existing fleet size, duration and timeout variables
opt-out only: the variable is omitted when the config sets code_quality to false
there is no opt-in step, so existing runs pick this up automatically

Evidence

BUGHUNTER_CODE_QUALITY

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 →