Coding standards, frameworks, refactoring, and code review (18.4K skills)
Systematic code review checklist and pre-commit quality gates for PRs. Use when: reviewing pull requests, checking code quality, before committing code. Keywords: review, PR, pull request, checklist, quality, commit, 審查, 檢查, 簽入.
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Refactor with tests first, one change at a time, never mix refactoring with bug fixes or new features
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Dispatch code-reviewer subagent to review implementation against plan or requirements before proceeding
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Validate at every layer data passes through to make bugs impossible
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Receive and act on code review feedback with technical rigor, not performative agreement or blind implementation
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Systematically trace bugs backward through call stack to find original trigger
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Create isolated git worktrees with smart directory selection and safety verification
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Comment WHY code exists and non-obvious decisions, not WHAT code does (mechanics)
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Each routine does one thing and does it well - extract when routines have multiple responsibilities
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Declare variables in smallest possible scope, initialize close to first use, minimize span and live time
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Name code by what it does in the domain, not how it's implemented or its history
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Flatten nested conditionals with early returns or table-driven methods - keep nesting depth under 3 levels
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Check all external inputs for validity - garbage in, nothing out, never garbage out
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Write comments explaining WHAT and WHY, never temporal context or history
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Search previous Claude Code conversations for facts, patterns, decisions, and context using semantic or text search
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Four-phase debugging framework that ensures root cause investigation before attempting fixes. Never jump to solutions.
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Use each variable for exactly one purpose - no hybrid coupling or hidden meanings
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Try 2-3 different approaches before implementing - don't settle for first design you think of
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Run verification commands and confirm output before claiming success
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Choose names that fully and accurately describe what the variable represents
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Release a new version of an R package including version bumping, NEWS.md updates, git tagging, GitHub release creation, and post-release development version setup. Use when a package is ready for a new patch, minor, or major release, after CRAN acceptance to create the corresponding GitHub release, or when setting up the development version bump immediately after a release.
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Multi-phase deep codebase review with severity ratings and structured output. Covers architecture, security, code quality, and UX/accessibility in a single coordinated pass. Produces a prioritized findings table suitable for direct conversion to GitHub issues via the create-github-issues skill.
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Refactor an over-long or poorly structured SKILL.md by extracting examples to references/EXAMPLES.md, splitting compound procedures, and reorganizing sections for progressive disclosure. Use when a skill exceeds the 500-line CI limit, when code blocks dominate the skill body, when a procedure step contains multiple unrelated operations, or after a content update pushed the skill over the line limit.
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Scaffold a new CLI command using Commander.js with options, action handler, three output modes (human-readable, quiet, JSON), and optional ceremony variant. Covers command naming, option design, shared context patterns, error handling, and integration testing. Use when adding a command to an existing Commander.js CLI, designing a new CLI tool from scratch, or standardizing command structure across a multi-command CLI.
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