Darwin Skill Optimizer
alchaincyf/darwin-skill
Scores SKILL.md files on a nine-dimension rubric, then improves them in a keep-or-revert loop with independent judge agents, test prompts, git history and human checkpoints.
Search and install agent skills from ClawHub, the public skill registry.
Install Clawhub
$ npx skills add PhyAgentOS/PhyAgentOS-core --skill clawhub -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install PhyAgentOS/PhyAgentOS-core clawhub --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/PhyAgentOS/PhyAgentOS-core.git skills-src && mkdir -p .claude/skills && cp -r skills-src/PhyAgentOS/skills/clawhub .claude/skills/clawhub && 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 "clawhub" agent skill from https://github.com/PhyAgentOS/PhyAgentOS-core/tree/main/PhyAgentOS/skills/clawhub into .claude/skills/clawhub/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "clawhub", 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/PhyAgentOS/PhyAgentOS-core/tree/main/PhyAgentOS/skills/clawhubType 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 PhyAgentOS/PhyAgentOS-core --skill clawhub -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install PhyAgentOS/PhyAgentOS-core clawhub --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PhyAgentOS/PhyAgentOS-core.git skills-src && mkdir -p .agents/skills && cp -r skills-src/PhyAgentOS/skills/clawhub .agents/skills/clawhub && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "clawhub" agent skill from https://github.com/PhyAgentOS/PhyAgentOS-core/tree/main/PhyAgentOS/skills/clawhub into .agents/skills/clawhub/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "clawhub", 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 PhyAgentOS/PhyAgentOS-core --skill clawhub -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install PhyAgentOS/PhyAgentOS-core clawhub --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PhyAgentOS/PhyAgentOS-core.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/PhyAgentOS/skills/clawhub .cursor/skills/clawhub && 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 "clawhub" agent skill from https://github.com/PhyAgentOS/PhyAgentOS-core/tree/main/PhyAgentOS/skills/clawhub into .cursor/skills/clawhub/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "clawhub", 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/PhyAgentOS/PhyAgentOS-core.git --path PhyAgentOS/skills/clawhub--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 PhyAgentOS/PhyAgentOS-core --skill clawhub -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install PhyAgentOS/PhyAgentOS-core clawhub --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PhyAgentOS/PhyAgentOS-core.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/PhyAgentOS/skills/clawhub .gemini/skills/clawhub && 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 "clawhub" agent skill from https://github.com/PhyAgentOS/PhyAgentOS-core/tree/main/PhyAgentOS/skills/clawhub into .gemini/skills/clawhub/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "clawhub", 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 PhyAgentOS/PhyAgentOS-core clawhubInstalls 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 PhyAgentOS/PhyAgentOS-core --skill clawhub -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/PhyAgentOS/PhyAgentOS-core.git skills-src && mkdir -p .github/skills && cp -r skills-src/PhyAgentOS/skills/clawhub .github/skills/clawhub && 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 "clawhub" agent skill from https://github.com/PhyAgentOS/PhyAgentOS-core/tree/main/PhyAgentOS/skills/clawhub into .github/skills/clawhub/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "clawhub", 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 PhyAgentOS/PhyAgentOS-core --skill clawhub -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install PhyAgentOS/PhyAgentOS-core clawhub --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PhyAgentOS/PhyAgentOS-core.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/PhyAgentOS/skills/clawhub .opencode/skills/clawhub && 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 "clawhub" agent skill from https://github.com/PhyAgentOS/PhyAgentOS-core/tree/main/PhyAgentOS/skills/clawhub into .opencode/skills/clawhub/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "clawhub", 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
clawhub- GitHub stars
- 2.8k
- Used in
- 3 other repos
- Token cost
- ~351 tokens
- SKILL.md length
- 127 words
- Files
- 1
- Skills in repo
- 5
- Repo updated
- First seen
- Licence
- MIT
At a glance
Search and install agent skills from ClawHub, the public skill registry.
- Tasks that involve Skill management
- SKILL.md covers When to use, Search, Install and Update, plus 2 more sections
- Calls npx
What it does
Clawhub is an agent skill from PhyAgentOS/PhyAgentOS-core. Search and install agent skills from ClawHub, the public skill registry.
Its SKILL.md is about 350 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Agent Workflows, covering Skill management. The repository describes itself as: PhyAgentOS is a Recursive Self-Improving (RSI) physical agent operating system that enables agents to recursively self-improve through agentic workflows. The licence is MIT.
When your agent uses it
- Tasks that involve Skill management
Example prompts
- “/clawhub”
Requirements
- Node.js
What it can do on your machine
Read from SKILL.md and the folder at commit 466e38b. 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
Shell commands in SKILL.md call:
npx
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use npx, which can reach the network depending on how they are called.
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
Clawhub loads about 351 tokens when it runs. Until then it costs about 20 tokens; SKILL.md has 127 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
The full file from PhyAgentOS/PhyAgentOS-core at commit 466e38b, republished under its MIT licence (© PhyAgentOS). 127 words, ~351 tokens.
Download SKILL.mdSave it as
.claude/skills/clawhub/SKILL.md (or your agent's skills folder).- name
- clawhub
- description
- Search and install agent skills from ClawHub, the public skill registry.
- homepage
- https://clawhub.ai
ClawHub
Public skill registry for AI agents. Search by natural language (vector search).
When to use
Use this skill when the user asks any of:
- "find a skill for …"
- "search for skills"
- "install a skill"
- "what skills are available?"
- "update my skills"
Search
npx --yes clawhub@latest search "web scraping" --limit 5Install
npx --yes clawhub@latest install <slug> --workdir ~/.PhyAgentOS/workspaceReplace <slug> with the skill name from search results. This places the skill into ~/.PhyAgentOS/workspace/skills/, where PhyAgentOS loads workspace skills from. Always include --workdir.
Update
npx --yes clawhub@latest update --all --workdir ~/.PhyAgentOS/workspaceList installed
npx --yes clawhub@latest list --workdir ~/.PhyAgentOS/workspaceNotes
- Requires Node.js (
npxcomes with it). - No API key needed for search and install.
- Login (
npx --yes clawhub@latest login) is only required for publishing. --workdir ~/.PhyAgentOS/workspaceis critical — without it, skills install to the current directory instead of the PhyAgentOS workspace.- After install, remind the user to start a new session to load the skill.
© PhyAgentOS, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in PhyAgentOS/skills/clawhub of PhyAgentOS/PhyAgentOS-core.
Open the folder on GitHubat commit 466e38b
Used in 3 other repositories
We found 3 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 3 other GitHub owners. This page covers the copy in PhyAgentOS/PhyAgentOS-core, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Clawhub 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 |
|---|---|---|---|---|---|---|
| Clawhub this skillPhyAgentOS/PhyAgentOS-core | 2.8k | 3 repos | ~351 | Automated safety check: Pass | MIT | |
| Darwin Skill Optimizeralchaincyf/darwin-skill | 6.2k | 1 repos | ~4.7k | Automated safety check: Pass | MIT | |
| Using Agent Skillsaddyosmani/agent-skills | 103k | 4 repos | ~2.4k | Automated safety check: Pass | MIT | |
| Ponytail Help CardDietrichGebert/ponytail | 158k | — | ~728 | Automated safety check: Pass | MIT | |
| Skill Creatorzhayujie/CowAgent | 47k | — | ~4.7k | Automated safety check: Notes | MIT | |
| Task Observerrebelytics/one-skill-to-rule-them-all | 3.2k | 1 repos | ~12k | Automated safety check: Pass | CC-BY-4.0 |
Similar skills
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.
Ponytail Help Card
DietrichGebert/ponytail
Shows a one-shot quick-reference card for the ponytail skills: intensity levels, the six commands, and how to turn it off, set a default mode and update.
Skill Creator
zhayujie/CowAgent
Guides creating, installing and updating agent skills in a workspace: SKILL.md frontmatter, bundled scripts and references, with scripts to scaffold, validate and package.
Task Observer
rebelytics/one-skill-to-rule-them-all
Monitors task execution for skill improvement opportunities.
Open-Science Skill Creator
aipoch/open-science
Creates, revises, evaluates and publishes skills in the Open-Science app through its native host.skills composer, with optional test prompts and benchmarks.
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Related
Categories
Questions about Clawhub
What does Clawhub do?
Search and install agent skills from ClawHub, the public skill registry. Clawhub is an agent skill from PhyAgentOS/PhyAgentOS-core. Search and install agent skills from ClawHub, the public skill registry.
When should I use Clawhub?
Clawhub fits situations like: tasks that involve Skill management.
How do I install Clawhub in Claude Code?
Run `npx skills add PhyAgentOS/PhyAgentOS-core --skill clawhub -a claude-code`. Or copy the skill folder (PhyAgentOS/skills/clawhub in PhyAgentOS/PhyAgentOS-core) into .claude/skills/clawhub in your project. Claude Code loads it when a task matches its description.
How do I install Clawhub in Codex?
Run `npx skills add PhyAgentOS/PhyAgentOS-core --skill clawhub -a codex`. Or copy the skill folder (PhyAgentOS/skills/clawhub in PhyAgentOS/PhyAgentOS-core) into .agents/skills/clawhub in your project. Codex loads it when a task matches its description.
Can I use Clawhub 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 PhyAgentOS/PhyAgentOS-core --skill clawhub -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/clawhub, .gemini/skills/clawhub, .github/skills/clawhub and .opencode/skills/clawhub in your project.
What does Clawhub need to run?
Going by SKILL.md and its folder, Clawhub needs the command-line tools its instructions call (npx). Our summary lists: Node.js.
Does Clawhub access the network?
SKILL.md contains no URLs. Its commands use npx, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Clawhub 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 Clawhub use?
Clawhub is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Clawhub use?
About 351 tokens (SKILL.md is roughly 1.4k 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 Clawhub?
Skills that share tags, products or a category with Clawhub: Darwin Skill Optimizer (alchaincyf/darwin-skill, 6.2k stars), Using Agent Skills (addyosmani/agent-skills, 103k stars), Ponytail Help Card (DietrichGebert/ponytail, 158k stars) and Skill Creator (zhayujie/CowAgent, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Clawhub?
PhyAgentOS (a GitHub organization) maintains it in PhyAgentOS/PhyAgentOS-core, which has 2,758 GitHub stars. The repository holds 5 skills in this directory. The repository was last updated on October 8, 2026.
Source: PhyAgentOS/PhyAgentOS-core on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.