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Skill

Review

gstack

Reads a finished code change just before it lands and flags what should block the merge - correctness, risk, missed cases - on the actual diff. It reviews written code at merge time, not an architecture plan before building and not a running failure.

Situations it fits

A finished pull request is sitting in the queue; you want someone to read the actual changed lines right before it merges and flag anything that should block it - a broken edge case, a risky change, a missed test.
Review. The four all sound like "look at the code," which is the trap. review reads the finished diff at merge time. plan-eng-review judges a proposed design before code exists; review reads a finished diff at merge time; investigate chases a live bug to its root cause; health tracks the whole codebase's quality over time.
A junior dev pushes his first solo branch. You open the pull request and immediately notice he flipped the comparison on line 47; two customers will receive each other’s medals if that ships.
Review. review-gstack is the correct fit because the situation involves examining a completed set of changes just before they go live and flagging a specific correctness issue that ought to stop them from shipping - spotting a swapped comparison operator on a line of delivered code is precisely the kind of defect this skill catches. The tempting distractor investigate-gstack might seem appropriate because both involve finding a mistake, but that skill is meant for chasing a live system failure to its root cause through systematic evidence-gathering, not for manually scanning a finished diff at merge time; the trap is mistaking a post-commit code inspection for a live failure diagnosis, even though no runtime system is acting up right now.

3 scenarios in the bank answer to Review. The rest are in the game.

Skills it gets confused with

These share a family with Review, which is another way of saying they are the ones you might reach for by mistake.

Knowing what Review does is the easy half. Telling it apart from the others under time pressure is the game.

Today's session

Review is part of garrytan/gstack. Licence: MIT. The description above was written for this game, not taken from the skill.