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.
Alive skill router — reads the current project's stack and loads/unloads skills dynamically.
Install Skill Router
$ npx skills add stevesolun/ctx --skill skill-router -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install stevesolun/ctx skill-router --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/stevesolun/ctx.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/skill-router .claude/skills/skill-router && 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-router" agent skill from https://github.com/stevesolun/ctx/tree/main/skills/skill-router into .claude/skills/skill-router/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-router", 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/stevesolun/ctx/tree/main/skills/skill-routerType 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 stevesolun/ctx --skill skill-router -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install stevesolun/ctx skill-router --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/stevesolun/ctx.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/skill-router .agents/skills/skill-router && 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-router" agent skill from https://github.com/stevesolun/ctx/tree/main/skills/skill-router into .agents/skills/skill-router/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-router", 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 stevesolun/ctx --skill skill-router -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install stevesolun/ctx skill-router --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/stevesolun/ctx.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/skill-router .cursor/skills/skill-router && 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-router" agent skill from https://github.com/stevesolun/ctx/tree/main/skills/skill-router into .cursor/skills/skill-router/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-router", 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/stevesolun/ctx.git --path skills/skill-router--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 stevesolun/ctx --skill skill-router -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install stevesolun/ctx skill-router --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/stevesolun/ctx.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/skill-router .gemini/skills/skill-router && 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-router" agent skill from https://github.com/stevesolun/ctx/tree/main/skills/skill-router into .gemini/skills/skill-router/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-router", 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 stevesolun/ctx skill-routerInstalls 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 stevesolun/ctx --skill skill-router -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/stevesolun/ctx.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/skill-router .github/skills/skill-router && 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-router" agent skill from https://github.com/stevesolun/ctx/tree/main/skills/skill-router into .github/skills/skill-router/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-router", 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 stevesolun/ctx --skill skill-router -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install stevesolun/ctx skill-router --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/stevesolun/ctx.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/skill-router .opencode/skills/skill-router && 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-router" agent skill from https://github.com/stevesolun/ctx/tree/main/skills/skill-router into .opencode/skills/skill-router/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-router", 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-router- GitHub stars
- 588
- Token cost
- ~292 tokens
- SKILL.md length
- 89 words
- Files
- 6 (incl. references)
- Skills in repo
- 26
- Repo updated
- First seen
- Licence
- MIT
At a glance
Alive skill router — reads the current project's stack and loads/unloads skills dynamically.
- Works in 5 steps: 01-scope — Is a scan needed? → 02-plan — Run the scanner → 03-build — Resolve the manifest → …
- Tasks that involve Skill management
- SKILL.md covers Pipeline, Invoke When and Stage Files
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Skill Router is an agent skill from stevesolun/ctx. Alive skill router — reads the current project's stack and loads/unloads skills dynamically. Invoke at session start or when project context changes.
Its SKILL.md is about 290 tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `references/01-scope.md`, `references/02-plan.md` and `references/03-build.md`).
It sits in Agent Workflows, covering Skill management. The repository describes itself as: CTX Fit finds the cheapest AI coding setup that reliably works on your repository, then applies the winner as a reviewable change. The licence is MIT.
When your agent uses it
- Tasks that involve Skill management
Example prompts
- “/skill-router”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- 01-scope — Is a scan needed?
- 02-plan — Run the scanner
- 03-build — Resolve the manifest
- 04-check — Validate before loading
- 05-deliver — Present to user
What it can do on your machine
Read from SKILL.md and the folder at commit 11b582a. 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 Router loads about 292 tokens when it runs, and up to ~1.8k if it reads all its reference files. Until then it costs about 41 tokens; SKILL.md has 89 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 stevesolun/ctx at commit 11b582a, republished under its MIT licence (© stevesolun). 89 words, ~292 tokens.
Download SKILL.mdSave it as
.claude/skills/skill-router/SKILL.md (or your agent's skills folder). This skill also uses 5 other files; get the full folder from GitHub.- name
- skill-router
- description
- Alive skill router — reads the current project's stack and loads/unloads skills dynamically. Invoke at session start or when project context changes.
- type
- meta
- priority
- 99
- always_load
- true
skill-router
Reads ~/.claude/skill-manifest.json and ~/.claude/pending-skills.json.
Executes the 5-stage pipeline. No skipping stages.
Pipeline
01-scope → 02-plan → 03-build → 04-check → 05-deliverInvoke When
- Session starts (automatic via using-superpowers pattern)
- User switches projects or opens a new repo
pending-skills.jsonexists (mid-session signals detected)- User asks "what skills are loaded?" or "update my skills"
Stage Files
All stage files are in references/. Read and follow each in order.
- 01-scope — Is a scan needed?
- 02-plan — Run the scanner
- 03-build — Resolve the manifest
- 04-check — Validate before loading
- 05-deliver — Present to user
See check-gates.md for validation questions.
© stevesolun, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 5 other files (references) in skills/skill-router of stevesolun/ctx.
- SKILL.md
- references/01-scope.md
- references/02-plan.md
- references/03-build.md
- references/04-check.md
- references/05-deliver.md
Open the folder on GitHubat commit 11b582a
Compare with similar skills
Skill Router 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 Router this skillstevesolun/ctx | 588 | — | ~292 | 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 | 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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Related
Categories
Questions about Skill Router
What does Skill Router do?
Alive skill router — reads the current project's stack and loads/unloads skills dynamically. Skill Router is an agent skill from stevesolun/ctx. Alive skill router — reads the current project's stack and loads/unloads skills dynamically.
When should I use Skill Router?
Skill Router fits situations like: tasks that involve Skill management.
How do I install Skill Router in Claude Code?
Run `npx skills add stevesolun/ctx --skill skill-router -a claude-code`. Or copy the skill folder (skills/skill-router in stevesolun/ctx) into .claude/skills/skill-router in your project. Claude Code loads it when a task matches its description.
How do I install Skill Router in Codex?
Run `npx skills add stevesolun/ctx --skill skill-router -a codex`. Or copy the skill folder (skills/skill-router in stevesolun/ctx) into .agents/skills/skill-router in your project. Codex loads it when a task matches its description.
Can I use Skill Router 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 stevesolun/ctx --skill skill-router -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-router, .gemini/skills/skill-router, .github/skills/skill-router and .opencode/skills/skill-router in your project.
What does Skill Router need to run?
SKILL.md names no scripts, command-line tools or credentials: Skill Router is instructions for the agent only.
Does Skill Router 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 Router 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 Router use?
Skill Router 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 Skill Router use?
About 292 tokens (SKILL.md is roughly 1.2k 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 1.5k tokens, read only when the agent opens those files.
What are the alternatives to Skill Router?
Skills that share tags, products or a category with Skill Router: 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 Skill Router?
stevesolun (a GitHub user) maintains it in stevesolun/ctx, which has 588 GitHub stars. The repository holds 26 skills in this directory. The repository was last updated on October 4, 2026.
Source: stevesolun/ctx on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.