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.
Find, install, create, improve, and publish AI agent skills through the Sundial ecosystem.
Install Skill
$ npx skills add sundial-org/skills --skill skill -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install sundial-org/skills 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/sundial-org/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/skill .claude/skills/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 "skill" agent skill from https://github.com/sundial-org/skills/tree/main/skills/skill into .claude/skills/skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "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/sundial-org/skills/tree/main/skills/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 sundial-org/skills --skill skill -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install sundial-org/skills skill --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sundial-org/skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/skill .agents/skills/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 "skill" agent skill from https://github.com/sundial-org/skills/tree/main/skills/skill into .agents/skills/skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "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 sundial-org/skills --skill skill -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install sundial-org/skills skill --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sundial-org/skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/skill .cursor/skills/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 "skill" agent skill from https://github.com/sundial-org/skills/tree/main/skills/skill into .cursor/skills/skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "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/sundial-org/skills.git --path skills/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 sundial-org/skills --skill skill -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install sundial-org/skills skill --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sundial-org/skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/skill .gemini/skills/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 "skill" agent skill from https://github.com/sundial-org/skills/tree/main/skills/skill into .gemini/skills/skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "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 sundial-org/skills 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 sundial-org/skills --skill skill -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/sundial-org/skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/skill .github/skills/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 "skill" agent skill from https://github.com/sundial-org/skills/tree/main/skills/skill into .github/skills/skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "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 sundial-org/skills --skill 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 sundial-org/skills skill --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sundial-org/skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/skill .opencode/skills/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 "skill" agent skill from https://github.com/sundial-org/skills/tree/main/skills/skill into .opencode/skills/skill/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "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
skill- GitHub stars
- 152
- Token cost
- ~1.2k tokens
- SKILL.md length
- 437 words
- Files
- 6 (incl. scripts, references)
- Skills in repo
- 13
- Repo updated
- First seen
- Licence
- None found
At a glance
Find, install, create, improve, and publish AI agent skills through the Sundial ecosystem.
- Works in 7 steps: Ask the user what the skill should do… → Ask: project scope or global scope? → Read references/skill-creation-guide.md… → …
- The user wants to find
- SKILL.md covers Agent Detection, Find & Install Skills, Create a Skill and Improve a Skill, plus 3 more sections
- Runs Shell scripts from its folder; calls npx and bash; reaches sundialhub.com
What it does
Skill is an agent skill from sundial-org/skills. Find, install, create, improve, and publish AI agent skills through the Sundial ecosystem. Use when the user wants to find or search for skills, install a skill, create a new skill, improve or evaluate an existing skill, or publish a skill to Sundial Hub. Trigger phrases include "find a skill", "install skill", "create a skill", "make a skill", "improve this skill", "evaluate skill", "publish skill", "push skill", "search for skills".
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including scripts and reference files (for example `references/improvement-rubric.md`, `references/output-patterns.md` and `references/skill-creation-guide.md`).
It sits in Agent Workflows, covering Skill authoring and Skill management. The repository describes itself as: Claude Code Skills by Sundial.
When your agent uses it
- The user wants to find
- Search for skills
- Install a skill
- Create a new skill
Example prompts
- “find a skill”
- “install skill”
- “create a skill”
- “/skill”
Requirements
- Node.js
- A Bash shell
Workflow steps
7 steps, taken from the first numbered list in SKILL.md.
- Ask the user what the skill should do and gather concrete usage examples
- Ask: project scope or global scope?
- Read references/skill-creation-guide.md for full guidance on skill anatomy, frontmatter spec, body writing, and design patterns
- Create the skill directory with SKILL.md containing proper frontmatter (name + description) and markdown body
- Add any needed scripts/, references/, or assets/ subdirectories
- Validate by running
- Tell the user: "Publish when ready using the publish workflow below"
What it can do on your machine
Read from SKILL.md and the folder at commit 5a3bf9f. 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/ (Shell), which the agent can run.
Shell commands in SKILL.md call:
npxbash
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
sundialhub.com
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
Skill loads about 1.2k tokens when it runs, and up to ~4.4k if it reads all its reference files. Until then it costs about 111 tokens; SKILL.md has 437 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 437 words (~1,211 tokens).
“Find, install, create, improve, and publish skills via Sundial Hub.”
- name
- skill
Files
SKILL.md and 5 other files (scripts, references) in skills/skill of sundial-org/skills.
- SKILL.md
- references/improvement-rubric.md
- references/output-patterns.md
- references/skill-creation-guide.md
- references/workflows.md
- scripts/validate_skill.sh
Open the folder on GitHubat commit 5a3bf9f
Compare with similar skills
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 |
|---|---|---|---|---|---|---|
| Skill this skillsundial-org/skills | 152 | — | ~1.2k | Automated safety check: Pass | None | |
| Darwin Skill Optimizeralchaincyf/darwin-skill | 6.2k | 1 repos | ~4.7k | Automated safety check: Pass | MIT | |
| Skill Creatorzhayujie/CowAgent | 47k | — | ~4.7k | Automated safety check: Notes | MIT | |
| Open-Science Skill Creatoraipoch/open-science | 5.5k | — | ~1.7k | Automated safety check: Pass | Apache-2.0 | |
| Skill Quality ReviewerGalaxy-Dawn/claude-scholar | 5.7k | 1 repos | ~3k | Automated safety check: Pass | MIT | |
| Prismer Skill CreatorPrismer-AI/PrismerCloud | 1.6k | — | ~2.6k | Automated safety check: Notes | MIT |
Similar skills
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.
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.
Skill Quality Reviewer
Galaxy-Dawn/claude-scholar
Scores a skill across description, content organization, writing style and structure, then produces letter grades and a prioritized improvement plan.
Prismer Skill Creator
Prismer-AI/PrismerCloud
Walks an agent through creating, importing, editing, validating, testing and publishing Prismer Skills with a fixed workflow and bundled scripts.
Skill Factory
sangrokjung/claude-forge
Analyze session work and automatically convert reusable patterns into Claude Code skills.
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Related
Categories
Questions about Skill
What does Skill do?
Find, install, create, improve, and publish AI agent skills through the Sundial ecosystem. Skill is an agent skill from sundial-org/skills. Find, install, create, improve, and publish AI agent skills through the Sundial ecosystem.
When should I use Skill?
Skill fits situations like: the user wants to find; search for skills; install a skill; create a new skill.
How do I install Skill in Claude Code?
Run `npx skills add sundial-org/skills --skill skill -a claude-code`. Or copy the skill folder (skills/skill in sundial-org/skills) into .claude/skills/skill in your project. Claude Code loads it when a task matches its description.
How do I install Skill in Codex?
Run `npx skills add sundial-org/skills --skill skill -a codex`. Or copy the skill folder (skills/skill in sundial-org/skills) into .agents/skills/skill in your project. Codex loads it when a task matches its description.
Can I use 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 sundial-org/skills --skill 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/skill, .gemini/skills/skill, .github/skills/skill and .opencode/skills/skill in your project.
What does Skill need to run?
Going by SKILL.md and its folder, Skill needs a shell for the scripts in its folder and the command-line tools its instructions call (npx and bash). Our summary lists: Node.js; A Bash shell.
Does Skill access the network?
SKILL.md names 1 domain. In commands or code: sundialhub.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.
Is 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Skill use?
No licence was found for Skill or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Skill 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. Its references folder adds about 3.2k tokens, read only when the agent opens those files.
What are the alternatives to Skill?
Skills that share tags, products or a category with Skill: Darwin Skill Optimizer (alchaincyf/darwin-skill, 6.2k stars), Skill Creator (zhayujie/CowAgent, 47k stars), Open-Science Skill Creator (aipoch/open-science, 5.5k stars) and Skill Quality Reviewer (Galaxy-Dawn/claude-scholar, 5.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Skill?
sundial-org (a GitHub organization) maintains it in sundial-org/skills, which has 152 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on July 15, 2026.
Source: sundial-org/skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.