Logic Diff

Quality score: 70/100 · Category: Dev Tools · Sub-category: ide-editor

Compare two code versions for semantic equivalence via semi-formal tracing of both versions side-by-side. Trigger when the user shares a refactor, rewrite, migration, or A/B implementation and wants to confirm behavior is unchanged — "did I break anything", "is this equivalent", "check my refactor", "same behavior after the change?", "does my rewrite produce the same output", "switched from X to Y — same results?". SCOPE HARD RULE: requires two code versions (A and B). A single version for bug-finding uses logic-review; one version + a failing test uses logic-locate; explaining what one piece of code does uses logic-explain; codebase audit uses logic-health. Do NOT trigger for: single-version review, performance comparison, design-quality comparison, or "which is better-written" questions.

What this skill does

Logic Diff is a production-ready Claude Code skill (quality score 70/100) in the ide-editor sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/logic-diff/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Logic Diff skill is built for developers, power users, and teams automating repetitive workflows and improving developer experience. It is part of the open ClaudSkills registry, a community-curated catalog of 15,000+ capabilities you can install for Claude Code — the Claude CLI agent.

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/logic-diff
curl -L https://claudskills.com/skills/logic-diff/SKILL.md \
  -o ~/.claude/skills/logic-diff/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/logic-diff/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/logic-diff/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\logic-diff\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

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