# Skill Diff

> Shows side-by-side diffs of skill changes. Generates HTML comparison of before/after for changed SKILL.md files. Use when reviewing skill changes. Use when this capability is needed.

- Skill: `tomevault-io/skill-diff` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/skill-diff`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/skill-diff/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/skill-diff

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Generate visual diffs for changed skills, organized by scope.

## Scopes

| Scope | Comparison |
|-------|------------|
| **Uncommitted** | Working tree vs HEAD |
| **Staged** | Index vs HEAD |
| **Branch** | HEAD vs main |

## Usage

Run the script (auto-opens in browser):

```bash
node .claude/skills/skill-diff/scripts/skill-diff.js
```

Do NOT run `open` manually — the script handles it.

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<!-- tomevault:4.0:skill_md:2026-04-13 -->