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.
Bundles one or more existing skills and the integrations they need into a single named, installable capability.
Install Capability Creator
$ npx skills add holaboss-ai/holaOS --skill capability-creator -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install holaboss-ai/holaOS capability-creator --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/holaboss-ai/holaOS.git skills-src && mkdir -p .claude/skills && cp -r skills-src/runtime/harnesses/src/embedded-skills/capability-creator .claude/skills/capability-creator && 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 "capability-creator" agent skill from https://github.com/holaboss-ai/holaOS/tree/main/runtime/harnesses/src/embedded-skills/capability-creator into .claude/skills/capability-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "capability-creator", 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/holaboss-ai/holaOS/tree/main/runtime/harnesses/src/embedded-skills/capability-creatorType 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 holaboss-ai/holaOS --skill capability-creator -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install holaboss-ai/holaOS capability-creator --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/holaboss-ai/holaOS.git skills-src && mkdir -p .agents/skills && cp -r skills-src/runtime/harnesses/src/embedded-skills/capability-creator .agents/skills/capability-creator && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "capability-creator" agent skill from https://github.com/holaboss-ai/holaOS/tree/main/runtime/harnesses/src/embedded-skills/capability-creator into .agents/skills/capability-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "capability-creator", 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 holaboss-ai/holaOS --skill capability-creator -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install holaboss-ai/holaOS capability-creator --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/holaboss-ai/holaOS.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/runtime/harnesses/src/embedded-skills/capability-creator .cursor/skills/capability-creator && 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 "capability-creator" agent skill from https://github.com/holaboss-ai/holaOS/tree/main/runtime/harnesses/src/embedded-skills/capability-creator into .cursor/skills/capability-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "capability-creator", 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/holaboss-ai/holaOS.git --path runtime/harnesses/src/embedded-skills/capability-creator--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 holaboss-ai/holaOS --skill capability-creator -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install holaboss-ai/holaOS capability-creator --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/holaboss-ai/holaOS.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/runtime/harnesses/src/embedded-skills/capability-creator .gemini/skills/capability-creator && 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 "capability-creator" agent skill from https://github.com/holaboss-ai/holaOS/tree/main/runtime/harnesses/src/embedded-skills/capability-creator into .gemini/skills/capability-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "capability-creator", 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 holaboss-ai/holaOS capability-creatorInstalls 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 holaboss-ai/holaOS --skill capability-creator -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/holaboss-ai/holaOS.git skills-src && mkdir -p .github/skills && cp -r skills-src/runtime/harnesses/src/embedded-skills/capability-creator .github/skills/capability-creator && 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 "capability-creator" agent skill from https://github.com/holaboss-ai/holaOS/tree/main/runtime/harnesses/src/embedded-skills/capability-creator into .github/skills/capability-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "capability-creator", 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 holaboss-ai/holaOS --skill capability-creator -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install holaboss-ai/holaOS capability-creator --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/holaboss-ai/holaOS.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/runtime/harnesses/src/embedded-skills/capability-creator .opencode/skills/capability-creator && 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 "capability-creator" agent skill from https://github.com/holaboss-ai/holaOS/tree/main/runtime/harnesses/src/embedded-skills/capability-creator into .opencode/skills/capability-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "capability-creator", 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
capability-creator- GitHub stars
- 11k
- Token cost
- ~385 tokens
- SKILL.md length
- 127 words
- Files
- 1
- Skills in repo
- 30
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Bundles one or more existing skills and the integrations they need into a single named, installable capability.
- Works in 5 steps: Clarify the outcome the capability… → Ensure each skill it needs exists under… → Write the manifest to… → …
- Packaging a set of skills and their integrations into one capability
- SKILL.md covers Workflow and Manifest format
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
This skill is a workflow for assembling a capability: a bundle that references existing skills and declares the external integrations they depend on, then installs the bundle as one named unit. It has you confirm the outcome the capability should deliver, check that every skill it needs already exists under a skills folder (creating any missing one first), and write a manifest that references skills rather than copying them.
Once the manifest is written it calls an install tool with the capability's id and reports the result back, including telling you which service to connect if an integration comes back needing a connection.
When your agent uses it
- Packaging a set of skills and their integrations into one capability
- Installing a new capability into the workspace
Example prompts
- “Create a capability that bundles the invoicing and email skills.”
- “Install the capability I just defined and tell me what needs connecting.”
Requirements
- Existing skills already present in the workspace
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Clarify the outcome the capability should deliver and which platforms it touches.
- Ensure each skill it needs exists under skills//. Create any
- Write the manifest to capabilities//capability.yaml at the
- Call the capability_install tool with capability_id: .
- Report the result. If an integration comes back needs_connection, tell the
What it can do on your machine
Read from SKILL.md and the folder at commit 4684714. 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 (its code samples are yaml).
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
Capability Creator loads about 385 tokens when it runs. Until then it costs about 34 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 127 words (~385 tokens).
“A capability bundles one or more skills and the integrations they need into one named, installable unit. Use this when the user wants to create a capability.”
- name
- capability-creator
Files
Just SKILL.md in runtime/harnesses/src/embedded-skills/capability-creator of holaboss-ai/holaOS.
Open the folder on GitHubat commit 4684714
Compare with similar skills
Capability Creator 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 |
|---|---|---|---|---|---|---|
| Capability Creator this skillholaboss-ai/holaOS | 11k | — | ~385 | Automated safety check: Pass | Custom licence | |
| 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 | 159k | — | ~726 | 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 |
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Skill Creator
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Task Observer
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Related
Categories
Questions about Capability Creator
What does Capability Creator do?
Bundles one or more existing skills and the integrations they need into a single named, installable capability. This skill is a workflow for assembling a capability: a bundle that references existing skills and declares the external integrations they depend on, then installs the bundle as one named unit. It has you confirm the outcome the capability should deliver, check that every skill it needs already exists under a skills folder (creating any missing one first), and write a manifest that references skills rather than copying them.
When should I use Capability Creator?
Capability Creator fits situations like: packaging a set of skills and their integrations into one capability; installing a new capability into the workspace.
How do I install Capability Creator in Claude Code?
Run `npx skills add holaboss-ai/holaOS --skill capability-creator -a claude-code`. Or copy the skill folder (runtime/harnesses/src/embedded-skills/capability-creator in holaboss-ai/holaOS) into .claude/skills/capability-creator in your project. Claude Code loads it when a task matches its description.
How do I install Capability Creator in Codex?
Run `npx skills add holaboss-ai/holaOS --skill capability-creator -a codex`. Or copy the skill folder (runtime/harnesses/src/embedded-skills/capability-creator in holaboss-ai/holaOS) into .agents/skills/capability-creator in your project. Codex loads it when a task matches its description.
Can I use Capability Creator 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 holaboss-ai/holaOS --skill capability-creator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/capability-creator, .gemini/skills/capability-creator, .github/skills/capability-creator and .opencode/skills/capability-creator in your project.
What does Capability Creator need to run?
SKILL.md names no scripts, command-line tools or credentials: Capability Creator is instructions for the agent only. Our summary lists: Existing skills already present in the workspace.
Does Capability Creator 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 Capability Creator 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 Capability Creator use?
Capability Creator 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 Capability Creator use?
About 385 tokens (SKILL.md is roughly 1.5k 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 Capability Creator?
Skills that share tags, products or a category with Capability Creator: Darwin Skill Optimizer (alchaincyf/darwin-skill, 6.2k stars), Using Agent Skills (addyosmani/agent-skills, 103k stars), Ponytail Help Card (DietrichGebert/ponytail, 159k 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 Capability Creator?
holaboss-ai (a GitHub organization) maintains it in holaboss-ai/holaOS, which has 11,455 GitHub stars. The repository holds 30 skills in this directory. The repository was last updated on August 21, 2026.
Source: holaboss-ai/holaOS on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.