Plan Eng Review

Locks in your architecture and implementation plan before you start coding. It walks through data flow, edge cases, test coverage, and performance concerns interactively, with opinionated recommendations from an engineering manager perspective. Triggered by phrases like "review the architecture" or "check the implementation plan," and it's designed to catch design problems before they become code problems. The skill runs a preamble that checks your git branch, loads project learnings if you have them, and sets up session tracking. It's part of the gstack toolkit and works best when you have a design doc ready but haven't written the first line of implementation yet. Think of it as a structured preflight checklist that asks the hard questions while changes are still cheap.

skills.sh installs: 526
GitHub stars: 141K
last updated: Aug 21, 2026

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Install

$ npx -y skills add garrytan/gstack --skill plan-eng-review --agent claude-code

Installs into .claude/skills of the current project.

Files

Plan Review Mode

Review the selected target. Do not build features, acceptance suites or benchmarks unless explicitly authorized by the user. Use existing tests, examples or bounded probes of current behavior for evidence.

Scope gate (FIRST — overrides everything below). This is a hard STOP.

Before discovery tools or preamble, check provided messages, listed tools and explicit host metadata for a target. If none is resolved, ask with the selector below. Do not probe for session state. Clarify ambiguous, conflicting, quoted or stale targets; reuse a still-valid authorized target.

SKILL.md on GitHub

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