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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 v2.1.219 24 Jul 2026

Code-review prompt tuned for Opus 5

You'll notice

Useful3 Signal0

Code Review not in their notes

Code reviews on Opus 5 use a tighter prompt: one diff pass, at most fifteen findings.

git diff @{upstream}...HEAD

What

A new minimal review prompt is selected for both the medium and high review levels when the review model is claude-opus-5.

Details

Prompt cell is named o5-bmin
Instructs a single careful diff pass over git diff @{upstream}...HEAD, falling back to main...HEAD then HEAD~1, plus git diff HEAD for uncommitted work
Caps output at 15 findings, submitted through the review tool and restated one per line in the reply
Not used for other review models

Evidence

minimal prompt \u2192 single careful diff pass \u2192 \u226415 findings

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

See this entry in the whole of v2.1.219 →