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.
Self-evolving skill optimization via SkillOpt-paper-grounded text-space optimizer.
Install Skill Optimizer
$ npx skills add inbrainfun/inbrain --skill skill-optimizer -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install inbrainfun/inbrain skill-optimizer --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/inbrainfun/inbrain.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/skill-optimizer .claude/skills/skill-optimizer && 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-optimizer" agent skill from https://github.com/inbrainfun/inbrain/tree/main/skills/skill-optimizer into .claude/skills/skill-optimizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-optimizer", 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/inbrainfun/inbrain/tree/main/skills/skill-optimizerType 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 inbrainfun/inbrain --skill skill-optimizer -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install inbrainfun/inbrain skill-optimizer --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/inbrainfun/inbrain.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/skill-optimizer .agents/skills/skill-optimizer && 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-optimizer" agent skill from https://github.com/inbrainfun/inbrain/tree/main/skills/skill-optimizer into .agents/skills/skill-optimizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-optimizer", 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 inbrainfun/inbrain --skill skill-optimizer -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install inbrainfun/inbrain skill-optimizer --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/inbrainfun/inbrain.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/skill-optimizer .cursor/skills/skill-optimizer && 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-optimizer" agent skill from https://github.com/inbrainfun/inbrain/tree/main/skills/skill-optimizer into .cursor/skills/skill-optimizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-optimizer", 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/inbrainfun/inbrain.git --path skills/skill-optimizer--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 inbrainfun/inbrain --skill skill-optimizer -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install inbrainfun/inbrain skill-optimizer --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/inbrainfun/inbrain.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/skill-optimizer .gemini/skills/skill-optimizer && 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-optimizer" agent skill from https://github.com/inbrainfun/inbrain/tree/main/skills/skill-optimizer into .gemini/skills/skill-optimizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-optimizer", 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 inbrainfun/inbrain skill-optimizerInstalls 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 inbrainfun/inbrain --skill skill-optimizer -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/inbrainfun/inbrain.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/skill-optimizer .github/skills/skill-optimizer && 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-optimizer" agent skill from https://github.com/inbrainfun/inbrain/tree/main/skills/skill-optimizer into .github/skills/skill-optimizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-optimizer", 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 inbrainfun/inbrain --skill skill-optimizer -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install inbrainfun/inbrain skill-optimizer --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/inbrainfun/inbrain.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/skill-optimizer .opencode/skills/skill-optimizer && 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-optimizer" agent skill from https://github.com/inbrainfun/inbrain/tree/main/skills/skill-optimizer into .opencode/skills/skill-optimizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-optimizer", 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-optimizer- GitHub stars
- 142
- Used in
- 1 other repo
- Token cost
- ~2.2k tokens
- SKILL.md length
- 859 words
- Files
- 3
- Skills in repo
- 54
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Self-evolving skill optimization via SkillOpt-paper-grounded text-space optimizer.
- Works in 4 steps: Generate the starter. Run → Review AND STRENGTHEN the judges. This… → Delete the sentinel line (#… → …
- Tasks that involve Skill management
- SKILL.md covers When to invoke this skill, Iron Law, The pipeline and Starting a benchmark from the…, plus 5 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Skill Optimizer is an agent skill from inbrainfun/inbrain. Self-evolving skill optimization via SkillOpt-paper-grounded text-space optimizer.
Its SKILL.md is about 2.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files.
It sits in Agent Workflows, covering Skill management.
When your agent uses it
- Tasks that involve Skill management
Example prompts
- “/skill-optimizer”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Generate the starter. Run
- Review AND STRENGTHEN the judges. This is YOUR job and it is load-bearing.
- Delete the sentinel line (# BOOTSTRAP_PENDING_REVIEW, the last line).
- Run the optimizer with --split 1:1:1
What it can do on your machine
Read from SKILL.md and the folder at commit 5231990. 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
Skill Optimizer loads about 2.2k tokens when it runs. Until then it costs about 25 tokens; SKILL.md has 859 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 859 words (~2,209 tokens).
“Self-evolving skill optimization. Treats SKILL.md as the trainable parameters of a frozen agent. Validation-gated, budget-capped, atomic-versioned.”
- name
- skill-optimizer
- version
- 0.1.0
- triggers
- optimize this skill, tune the skill against the benchmark, make the skill better, run skillopt, skillopt for
- mutating
- true
- brain_first
- exempt
Files
SKILL.md and 2 other files in skills/skill-optimizer of inbrainfun/inbrain.
- SKILL.md
- routing-eval.jsonl
- skillopt-benchmark.jsonl
Open the folder on GitHubat commit 5231990
Used in 1 other repository
We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in inbrainfun/inbrain, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Skill Optimizer 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 Optimizer this skillinbrainfun/inbrain | 142 | 1 repos | ~2.2k | 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 | 102k | 4 repos | ~2.4k | 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 | |
| Skill Stocktakeaffaan-m/ECC | 274k | 5 repos | ~1.9k | Automated safety check: Pass | MIT |
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Categories
Questions about Skill Optimizer
What does Skill Optimizer do?
Self-evolving skill optimization via SkillOpt-paper-grounded text-space optimizer. Skill Optimizer is an agent skill from inbrainfun/inbrain. Self-evolving skill optimization via SkillOpt-paper-grounded text-space optimizer.
When should I use Skill Optimizer?
Skill Optimizer fits situations like: tasks that involve Skill management.
How do I install Skill Optimizer in Claude Code?
Run `npx skills add inbrainfun/inbrain --skill skill-optimizer -a claude-code`. Or copy the skill folder (skills/skill-optimizer in inbrainfun/inbrain) into .claude/skills/skill-optimizer in your project. Claude Code loads it when a task matches its description.
How do I install Skill Optimizer in Codex?
Run `npx skills add inbrainfun/inbrain --skill skill-optimizer -a codex`. Or copy the skill folder (skills/skill-optimizer in inbrainfun/inbrain) into .agents/skills/skill-optimizer in your project. Codex loads it when a task matches its description.
Can I use Skill Optimizer 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 inbrainfun/inbrain --skill skill-optimizer -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-optimizer, .gemini/skills/skill-optimizer, .github/skills/skill-optimizer and .opencode/skills/skill-optimizer in your project.
What does Skill Optimizer need to run?
SKILL.md names no scripts, command-line tools or credentials: Skill Optimizer is instructions for the agent only.
Does Skill Optimizer 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 Skill Optimizer 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 Skill Optimizer use?
Skill Optimizer 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 Skill Optimizer use?
About 2.2k tokens (SKILL.md is roughly 8.8k 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 Skill Optimizer?
Skills that share tags, products or a category with Skill Optimizer: Darwin Skill Optimizer (alchaincyf/darwin-skill, 6.2k stars), Using Agent Skills (addyosmani/agent-skills, 102k stars), Skill Creator (zhayujie/CowAgent, 47k stars) and Task Observer (rebelytics/one-skill-to-rule-them-all, 3.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Skill Optimizer?
inbrainfun (a GitHub user) maintains it in inbrainfun/inbrain, which has 142 GitHub stars. The repository holds 54 skills in this directory. The repository was last updated on July 17, 2026.
Source: inbrainfun/inbrain on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.