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JimLiu/baoyu-skills
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Compare two versions of a skill's instructions to detect degradations and complexity increases.
Install Diff Skill
$ npx skills add serpro69/claude-toolbox --skill diff-skill -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install serpro69/claude-toolbox diff-skill --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/serpro69/claude-toolbox.git skills-src && mkdir -p .claude/skills && cp -r skills-src/kodex-plugin/skills/diff-skill .claude/skills/diff-skill && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "diff-skill" agent skill from https://github.com/serpro69/claude-toolbox/tree/master/kodex-plugin/skills/diff-skill into .claude/skills/diff-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "diff-skill", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/serpro69/claude-toolbox/tree/master/kodex-plugin/skills/diff-skillType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add serpro69/claude-toolbox --skill diff-skill -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install serpro69/claude-toolbox diff-skill --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/serpro69/claude-toolbox.git skills-src && mkdir -p .agents/skills && cp -r skills-src/kodex-plugin/skills/diff-skill .agents/skills/diff-skill && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "diff-skill" agent skill from https://github.com/serpro69/claude-toolbox/tree/master/kodex-plugin/skills/diff-skill into .agents/skills/diff-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "diff-skill", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add serpro69/claude-toolbox --skill diff-skill -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install serpro69/claude-toolbox diff-skill --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/serpro69/claude-toolbox.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/kodex-plugin/skills/diff-skill .cursor/skills/diff-skill && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "diff-skill" agent skill from https://github.com/serpro69/claude-toolbox/tree/master/kodex-plugin/skills/diff-skill into .cursor/skills/diff-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "diff-skill", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/serpro69/claude-toolbox.git --path kodex-plugin/skills/diff-skill--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add serpro69/claude-toolbox --skill diff-skill -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install serpro69/claude-toolbox diff-skill --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/serpro69/claude-toolbox.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/kodex-plugin/skills/diff-skill .gemini/skills/diff-skill && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "diff-skill" agent skill from https://github.com/serpro69/claude-toolbox/tree/master/kodex-plugin/skills/diff-skill into .gemini/skills/diff-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "diff-skill", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install serpro69/claude-toolbox diff-skillInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add serpro69/claude-toolbox --skill diff-skill -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/serpro69/claude-toolbox.git skills-src && mkdir -p .github/skills && cp -r skills-src/kodex-plugin/skills/diff-skill .github/skills/diff-skill && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "diff-skill" agent skill from https://github.com/serpro69/claude-toolbox/tree/master/kodex-plugin/skills/diff-skill into .github/skills/diff-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "diff-skill", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add serpro69/claude-toolbox --skill diff-skill -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install serpro69/claude-toolbox diff-skill --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/serpro69/claude-toolbox.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/kodex-plugin/skills/diff-skill .opencode/skills/diff-skill && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "diff-skill" agent skill from https://github.com/serpro69/claude-toolbox/tree/master/kodex-plugin/skills/diff-skill into .opencode/skills/diff-skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "diff-skill", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
diff-skill- GitHub stars
- 151
- Token cost
- ~617 tokens
- SKILL.md length
- 221 words
- Files
- 7
- Skills in repo
- 12
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Compare two versions of a skill's instructions to detect degradations and complexity increases.
- Works in 2 steps: Degradation (asymmetric) — load-bearing… → Complexity — split into regressions…
- : user asks to diff
- SKILL.md covers Conventions, Required Outputs, Invocation and Workflow
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Diff Skill is an agent skill from serpro69/claude-toolbox. Compare two versions of a skill's instructions to detect degradations and complexity increases. TRIGGER when: user asks to diff, compare, or review changes to a skill's markdown instructions. Asymmetric check — only regressions count. Additions, clarifications, and strengthenings are not degradations. Compares HEAD → working tree by default. Walks the full reachable file set from SKILL.md via markdown links. Produces a report file under docs/reviews/diff-skill/ and an inline summary.
Its SKILL.md is about 620 tokens, which your agent loads only when the skill is triggered. The skill folder holds 9 other files (for example `diff-process.md`, `evals/clean-refactor/eval.json` and `evals/known-degradation/eval.json`).
It sits in Documents & Office. The repository describes itself as: Minimal by design, explicitly multi-lang, production-ready and battle-tested collection of configs and plugins for your Claude Code agentic development workflows: mcp, configs…
When your agent uses it
- : user asks to diff
- Review changes to a skills markdown instructions
Example prompts
- “/diff-skill”
Workflow steps
2 steps, taken from the first numbered list in SKILL.md.
- Degradation (asymmetric) — load-bearing instruction dropped, constraint weakened, verification step removed, scope narrowed, required…
- Complexity — split into regressions (introduced or worsened by the edit, affects verdict) and pre-existing advisories (exist regardless of…
What it can do on your machine
Read from SKILL.md and the folder at commit 94c5a05. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Diff Skill loads about 617 tokens when it runs. Until then it costs about 125 tokens; SKILL.md has 221 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 221 words (~617 tokens).
“Goal: Detect whether an edit to a skill's markdown instructions introduced degradations or made the skill harder for an LLM to follow.”
- name
- diff-skill
Files
SKILL.md and 6 other files in kodex-plugin/skills/diff-skill of serpro69/claude-toolbox.
- SKILL.md
- diff-process.md
- evals/clean-refactor/eval.json
- evals/clean-refactor/test-files
- evals/known-degradation/eval.json
- evals/known-degradation/test-files
- shared-capy-knowledge-protocol.md
Open the folder on GitHubat commit 94c5a05
Compare with similar skills
Diff Skill next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Diff Skill this skillserpro69/claude-toolbox | 151 | — | ~617 | Automated safety check: Pass | Custom licence | |
| Markdown Article FormatterJimLiu/baoyu-skills | 26k | 6 repos | ~3.5k | Automated safety check: Pass | MIT | |
| MarkitdownImCa0/just-laws | 782 | 14 repos | ~3.2k | Automated safety check: Notes | MIT | |
| Obsidian MarkdownAtmosphere/atmosphere | 3.8k | 20 repos | ~1.3k | Automated safety check: Pass | Apache-2.0 | |
| DOCXrvdbreemen/OTGW-firmware | 207 | 33 repos | ~4.3k | Automated safety check: Pass | Proprietary | |
| Gzh Designisjiamu/gzh-design-skill | 3.9k | 1 repos | ~2.2k | Automated safety check: Pass | AGPL-3.0 |
Similar skills
Markitdown
ImCa0/just-laws
Convert files and office documents to Markdown. An agent skill from ImCa0/just-laws.
Obsidian Markdown
Atmosphere/atmosphere
Create and edit Obsidian Flavored Markdown with wikilinks, embeds, callouts, properties, and other Obsidian-specific syntax.
DOCX
rvdbreemen/OTGW-firmware
A skill your agent uses whenever the user wants to create, read, edit, or manipulate Word documents (.docx files).
Gzh Design
isjiamu/gzh-design-skill
微信公众号文章排版引擎，将 Markdown 转换为可直接粘贴到公众号编辑器的 HTML。主题风格从 references/theme-index.md 注册的自定义主题库中选取，自动章节编号、关键词下划线标记、引言卡片、目录导航、代码块、图片/GIF、作者签名。支持 Markdown / Word(.docx) / PDF / 纯文本输入（非 Markdown…
Word Document Reader and Writer
HKUDS/DeepTutor
Reads, creates and edits Word .docx files with python-docx, and drops to raw OOXML for tracked changes, comments and byte-exact edits.
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TRIGGER when: asked to brainstorm, think through, explore, or pressure-test a technical idea or decision through conversation.
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TRIGGER when: asked to clarify or improve the explanation in existing local human documentation, such as a guide, design document, or implementation plan.
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TRIGGER when: asked to clarify or improve the explanation in existing local human documentation or a PR-description draft, including a PR URL or pasted body.
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TRIGGER when: asked to clarify or improve existing documentation, PR drafts or issue descriptions, including URLs and pasted bodies.
Related
Categories
Questions about Diff Skill
What does Diff Skill do?
Compare two versions of a skill's instructions to detect degradations and complexity increases. Diff Skill is an agent skill from serpro69/claude-toolbox. Compare two versions of a skill's instructions to detect degradations and complexity increases.
When should I use Diff Skill?
Diff Skill fits situations like: : user asks to diff; review changes to a skills markdown instructions.
How do I install Diff Skill in Claude Code?
Run `npx skills add serpro69/claude-toolbox --skill diff-skill -a claude-code`. Or copy the skill folder (kodex-plugin/skills/diff-skill in serpro69/claude-toolbox) into .claude/skills/diff-skill in your project. Claude Code loads it when a task matches its description.
How do I install Diff Skill in Codex?
Run `npx skills add serpro69/claude-toolbox --skill diff-skill -a codex`. Or copy the skill folder (kodex-plugin/skills/diff-skill in serpro69/claude-toolbox) into .agents/skills/diff-skill in your project. Codex loads it when a task matches its description.
Can I use Diff Skill in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add serpro69/claude-toolbox --skill diff-skill -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/diff-skill, .gemini/skills/diff-skill, .github/skills/diff-skill and .opencode/skills/diff-skill in your project.
What does Diff Skill need to run?
SKILL.md names no scripts, command-line tools or credentials: Diff Skill is instructions for the agent only.
Does Diff Skill access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Diff Skill safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Diff Skill use?
Diff Skill has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Diff Skill use?
About 617 tokens (SKILL.md is roughly 2.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Diff Skill?
Skills that share tags, products or a category with Diff Skill: Markdown Article Formatter (JimLiu/baoyu-skills, 26k stars), Markitdown (ImCa0/just-laws, 782 stars), Obsidian Markdown (Atmosphere/atmosphere, 3.8k stars) and DOCX (rvdbreemen/OTGW-firmware, 207 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Diff Skill?
serpro69 (a GitHub user) maintains it in serpro69/claude-toolbox, which has 151 GitHub stars. The repository holds 12 skills in this directory. The repository was last updated on October 9, 2026.
Source: serpro69/claude-toolbox on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.