Using Agent Skills
addyosmani/agent-skills
Meta-skill for choosing which workflow skill fits the task at hand, plus always-on habits: surface assumptions, stop on confusion, push back, keep it simple and stay in scope.
Initialize a Harness Engineering framework in the current project.
Install Harness Engineering
$ npx skills add kangarooking/kangarooking-skills --skill harness-engineering -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install kangarooking/kangarooking-skills harness-engineering --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/kangarooking/kangarooking-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/harness-engineering .claude/skills/harness-engineering && 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 "harness-engineering" agent skill from https://github.com/kangarooking/kangarooking-skills/tree/main/harness-engineering into .claude/skills/harness-engineering/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "harness-engineering", 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/kangarooking/kangarooking-skills/tree/main/harness-engineeringType 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 kangarooking/kangarooking-skills --skill harness-engineering -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install kangarooking/kangarooking-skills harness-engineering --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kangarooking/kangarooking-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/harness-engineering .agents/skills/harness-engineering && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "harness-engineering" agent skill from https://github.com/kangarooking/kangarooking-skills/tree/main/harness-engineering into .agents/skills/harness-engineering/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "harness-engineering", 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 kangarooking/kangarooking-skills --skill harness-engineering -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install kangarooking/kangarooking-skills harness-engineering --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kangarooking/kangarooking-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/harness-engineering .cursor/skills/harness-engineering && 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 "harness-engineering" agent skill from https://github.com/kangarooking/kangarooking-skills/tree/main/harness-engineering into .cursor/skills/harness-engineering/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "harness-engineering", 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/kangarooking/kangarooking-skills.git --path harness-engineering--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 kangarooking/kangarooking-skills --skill harness-engineering -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install kangarooking/kangarooking-skills harness-engineering --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kangarooking/kangarooking-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/harness-engineering .gemini/skills/harness-engineering && 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 "harness-engineering" agent skill from https://github.com/kangarooking/kangarooking-skills/tree/main/harness-engineering into .gemini/skills/harness-engineering/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "harness-engineering", 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 kangarooking/kangarooking-skills harness-engineeringInstalls 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 kangarooking/kangarooking-skills --skill harness-engineering -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/kangarooking/kangarooking-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/harness-engineering .github/skills/harness-engineering && 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 "harness-engineering" agent skill from https://github.com/kangarooking/kangarooking-skills/tree/main/harness-engineering into .github/skills/harness-engineering/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "harness-engineering", 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 kangarooking/kangarooking-skills --skill harness-engineering -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install kangarooking/kangarooking-skills harness-engineering --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kangarooking/kangarooking-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/harness-engineering .opencode/skills/harness-engineering && 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 "harness-engineering" agent skill from https://github.com/kangarooking/kangarooking-skills/tree/main/harness-engineering into .opencode/skills/harness-engineering/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "harness-engineering", 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
harness-engineering- GitHub stars
- 657
- Token cost
- ~1.2k tokens
- SKILL.md length
- 331 words
- Files
- 20 (incl. scripts)
- Skills in repo
- 19
- Repo updated
- First seen
- Licence
- None found
At a glance
Initialize a Harness Engineering framework in the current project.
- Works in 4 steps: Gather Project Info → Generate Framework Files → Configure Hooks → …
- User says harness
- SKILL.md covers When to Use, Initialization Process, Usage After Initialization and Key Principles, plus 1 more section
- Runs Python scripts from its folder; calls python3
What it does
Harness Engineering is an agent skill from kangarooking/kangarooking-skills. Initialize a Harness Engineering framework in the current project. Use when user says 'harness', 'init harness', 'initialize framework', 'setup harness engineering', '/harness', or wants to set up a Plan-Build-Verify development workflow with specialized agents (planner, generator, evaluator). Creates CLAUDE.md, agent definitions, command templates, hooks, and documentation structure for autonomous AI-driven development.
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 25 other files, including scripts (for example `scripts/scaffold.py`, `templates/CLAUDE.md` and `templates/agents/doc-gardener.md`).
It sits in Agent Workflows, covering Agent instruction files. The repository describes itself as: My custom AI Agent skills.
When your agent uses it
- User says harness
- Initialize framework
- Setup harness engineering
- Wants to set up a Plan-Build-Verify development workflow with specialized agents (planner
Example prompts
- “harness”
- “init harness”
- “initialize framework”
- “/harness-engineering”
Requirements
- Python 3
- Node.js
Workflow steps
4 steps, taken from the step headings in SKILL.md.
- Gather Project Info
- Generate Framework Files
- Configure Hooks
- Verify Installation
What it can do on your machine
Read from SKILL.md and the folder at commit 08bbee0. 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
Ships 1 file in scripts/ (Python, from the files we listed), which the agent can run.
Shell commands in SKILL.md call:
python3
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
Harness Engineering loads about 1.2k tokens when it runs. Until then it costs about 111 tokens; SKILL.md has 331 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); the scripts in this folder are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 331 words (~1,196 tokens).
“One-click initialization of a complete Harness Engineering framework in any project directory.”
- name
- harness-engineering
Files
SKILL.md and 19 other files (scripts) in harness-engineering of kangarooking/kangarooking-skills.
- SKILL.md
- scripts/scaffold.py
- templates/CLAUDE.md
- templates/agents/doc-gardener.md
- templates/agents/evaluator.md
- templates/agents/generator.md
- templates/agents/planner.md
- templates/commands/build.md
- templates/commands/plan.md
- templates/commands/qa.md
- templates/commands/sprint.md
- templates/docs/architecture.md
- templates/docs/contracts/TEMPLATE.md
- templates/docs/golden-principles.md
- templates/docs/sprint-workflow.md
- … and 5 more
Open the folder on GitHubat commit 08bbee0
Compare with similar skills
Harness Engineering 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 |
|---|---|---|---|---|---|---|
| Harness Engineering this skillkangarooking/kangarooking-skills | 657 | — | ~1.2k | Automated safety check: Pass | None | |
| Using Agent Skillsaddyosmani/agent-skills | 103k | 4 repos | ~2.4k | Automated safety check: Pass | MIT | |
| Claude ReflectBayramAnnakov/claude-reflect | 1.7k | 2 repos | ~627 | Automated safety check: Pass | MIT | |
| Writing For Agentsbestofjs/bestofjs | 3.1k | 19 repos | ~2.7k | Automated safety check: Pass | MIT | |
| Neat-Freak Knowledge CloseoutKKKKhazix/khazix-skills | 21k | — | ~1.9k | Automated safety check: Pass | MIT | |
| Task Observerrebelytics/one-skill-to-rule-them-all | 3.2k | 1 repos | ~12k | Automated safety check: Pass | CC-BY-4.0 |
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Categories
Questions about Harness Engineering
What does Harness Engineering do?
Initialize a Harness Engineering framework in the current project. Harness Engineering is an agent skill from kangarooking/kangarooking-skills. Initialize a Harness Engineering framework in the current project.
When should I use Harness Engineering?
Harness Engineering fits situations like: user says harness; initialize framework; setup harness engineering; wants to set up a Plan-Build-Verify development workflow with specialized agents (planner.
How do I install Harness Engineering in Claude Code?
Run `npx skills add kangarooking/kangarooking-skills --skill harness-engineering -a claude-code`. Or copy the skill folder (harness-engineering in kangarooking/kangarooking-skills) into .claude/skills/harness-engineering in your project. Claude Code loads it when a task matches its description.
How do I install Harness Engineering in Codex?
Run `npx skills add kangarooking/kangarooking-skills --skill harness-engineering -a codex`. Or copy the skill folder (harness-engineering in kangarooking/kangarooking-skills) into .agents/skills/harness-engineering in your project. Codex loads it when a task matches its description.
Can I use Harness Engineering 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 kangarooking/kangarooking-skills --skill harness-engineering -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/harness-engineering, .gemini/skills/harness-engineering, .github/skills/harness-engineering and .opencode/skills/harness-engineering in your project.
What does Harness Engineering need to run?
Going by SKILL.md and its folder, Harness Engineering needs Python for the scripts in its folder and the command-line tools its instructions call (python3). Our summary lists: Python 3; Node.js.
Does Harness Engineering 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 Harness Engineering 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Harness Engineering use?
No licence was found for Harness Engineering or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Harness Engineering use?
About 1.2k tokens (SKILL.md is roughly 4.8k 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 Harness Engineering?
Skills that share tags, products or a category with Harness Engineering: Using Agent Skills (addyosmani/agent-skills, 103k stars), Claude Reflect (BayramAnnakov/claude-reflect, 1.7k stars), Writing For Agents (bestofjs/bestofjs, 3.1k stars) and Neat-Freak Knowledge Closeout (KKKKhazix/khazix-skills, 21k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Harness Engineering?
kangarooking (a GitHub user) maintains it in kangarooking/kangarooking-skills, which has 657 GitHub stars. The repository holds 19 skills in this directory. The repository was last updated on September 7, 2026.
Source: kangarooking/kangarooking-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.