Color Expert
nexu-io/open-design
Color science expert skill with 286K words of reference material covering OKLCH/OKLAB, palette generation, accessibility/contrast, color naming, pigment mixing, and historical color theory.
Display colorful ANSI art of the word "ultrathink". An agent skill from intellectronica/agent-skills.
CC0-1.0Auto-check passed
Install Ultrathink
$ npx skills add intellectronica/agent-skills --skill ultrathink -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install intellectronica/agent-skills ultrathink --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/intellectronica/agent-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/ultrathink .claude/skills/ultrathink && 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 "ultrathink" agent skill from https://github.com/intellectronica/agent-skills/tree/main/skills/ultrathink into .claude/skills/ultrathink/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ultrathink", 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/intellectronica/agent-skills/tree/main/skills/ultrathinkType 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 intellectronica/agent-skills --skill ultrathink -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install intellectronica/agent-skills ultrathink --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/intellectronica/agent-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/ultrathink .agents/skills/ultrathink && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "ultrathink" agent skill from https://github.com/intellectronica/agent-skills/tree/main/skills/ultrathink into .agents/skills/ultrathink/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ultrathink", 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 intellectronica/agent-skills --skill ultrathink -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install intellectronica/agent-skills ultrathink --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/intellectronica/agent-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/ultrathink .cursor/skills/ultrathink && 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 "ultrathink" agent skill from https://github.com/intellectronica/agent-skills/tree/main/skills/ultrathink into .cursor/skills/ultrathink/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ultrathink", 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/intellectronica/agent-skills.git --path skills/ultrathink--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 intellectronica/agent-skills --skill ultrathink -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install intellectronica/agent-skills ultrathink --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/intellectronica/agent-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/ultrathink .gemini/skills/ultrathink && 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 "ultrathink" agent skill from https://github.com/intellectronica/agent-skills/tree/main/skills/ultrathink into .gemini/skills/ultrathink/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ultrathink", 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 intellectronica/agent-skills ultrathinkInstalls 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 intellectronica/agent-skills --skill ultrathink -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/intellectronica/agent-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/ultrathink .github/skills/ultrathink && 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 "ultrathink" agent skill from https://github.com/intellectronica/agent-skills/tree/main/skills/ultrathink into .github/skills/ultrathink/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ultrathink", 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 intellectronica/agent-skills --skill ultrathink -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install intellectronica/agent-skills ultrathink --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/intellectronica/agent-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/ultrathink .opencode/skills/ultrathink && 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 "ultrathink" agent skill from https://github.com/intellectronica/agent-skills/tree/main/skills/ultrathink into .opencode/skills/ultrathink/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ultrathink", 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
ultrathink- GitHub stars
- 295
- Token cost
- ~184 tokens
- SKILL.md length
- 23 words
- Files
- 1
- Skills in repo
- 21
- Repo updated
- First seen
- Licence
- CC0-1.0
At a glance
Display colorful ANSI art of the word "ultrathink". An agent skill from intellectronica/agent-skills.
- The user says ultrathink
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Invokes /ultrathink
What it does
Ultrathink is an agent skill from intellectronica/agent-skills. Display colorful ANSI art of the word "ultrathink". Use when the user says "ultrathink" or invokes /ultrathink.
Its SKILL.md is about 180 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
The repository describes itself as: @intellectronica's agent skills. The licence is CC0-1.0.
When your agent uses it
- The user says ultrathink
- Invokes /ultrathink
Example prompts
- “ultrathink”
- “/ultrathink”
What it can do on your machine
Read from SKILL.md and the folder at commit 9b0e00a. 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 bash).
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
Ultrathink loads about 184 tokens when it runs. Until then it costs about 31 tokens; SKILL.md has 23 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 intellectronica/agent-skills at commit 9b0e00a, republished under its CC0-1.0 licence (© intellectronica). 23 words, ~184 tokens.
Download SKILL.mdSave it as
.claude/skills/ultrathink/SKILL.md (or your agent's skills folder).- name
- ultrathink
- description
- Display colorful ANSI art of the word "ultrathink". Use when the user says "ultrathink" or invokes /ultrathink.
Ultrathink
When this skill is invoked, run this Bash command to display colourful ANSI art:
printf '\n \033[1;31m╦ ╦\033[1;33m╦ \033[1;32m╔╦╗\033[1;36m╦═╗\033[1;34m╔═╗\033[1;35m╔╦╗\033[1;31m╦ ╦\033[1;33m╦\033[1;32m╔╗╔\033[1;36m╦╔═\033[0m\n \033[1;31m║ ║\033[1;33m║ \033[1;32m║ \033[1;36m╠╦╝\033[1;34m╠═╣\033[1;35m ║ \033[1;31m╠═╣\033[1;33m║\033[1;32m║║║\033[1;36m╠╩╗\033[0m\n \033[1;31m╚═╝\033[1;33m╩═╝\033[1;32m ╩ \033[1;36m╩╚═\033[1;34m╩ ╩\033[1;35m ╩ \033[1;31m╩ ╩\033[1;33m╩\033[1;32m╝╚╝\033[1;36m╩ ╩\033[0m\n\n'Do not add any other output or commentary.
© intellectronica, CC0-1.0. 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 skills/ultrathink of intellectronica/agent-skills.
Open the folder on GitHubat commit 9b0e00a
Compare with similar skills
Ultrathink 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 |
|---|---|---|---|---|---|---|
| Ultrathink this skillintellectronica/agent-skills | 295 | — | ~184 | Automated safety check: Pass | CC0-1.0 | |
| Color Expertnexu-io/open-design | 100k | — | ~331 | Automated safety check: Pass | Apache-2.0 | |
| Algorithmic Artnexu-io/open-design | 100k | — | ~351 | Automated safety check: Pass | Apache-2.0 | |
| Algorithmic Art with p5.jsanthropics/skills | 180k | 38 repos | ~4.9k | Automated safety check: Pass | Apache-2.0 | |
| Retina Displaythedaviddias/Front-End-Checklist | 74k | — | ~388 | Automated safety check: Pass | MIT | |
| Color Oklchthedaviddias/Front-End-Checklist | 74k | — | ~564 | Automated safety check: Pass | MIT |
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Questions about Ultrathink
What does Ultrathink do?
Display colorful ANSI art of the word "ultrathink". An agent skill from intellectronica/agent-skills. Ultrathink is an agent skill from intellectronica/agent-skills. Display colorful ANSI art of the word "ultrathink".
When should I use Ultrathink?
Ultrathink fits situations like: the user says ultrathink; invokes /ultrathink.
How do I install Ultrathink in Claude Code?
Run `npx skills add intellectronica/agent-skills --skill ultrathink -a claude-code`. Or copy the skill folder (skills/ultrathink in intellectronica/agent-skills) into .claude/skills/ultrathink in your project. Claude Code loads it when a task matches its description.
How do I install Ultrathink in Codex?
Run `npx skills add intellectronica/agent-skills --skill ultrathink -a codex`. Or copy the skill folder (skills/ultrathink in intellectronica/agent-skills) into .agents/skills/ultrathink in your project. Codex loads it when a task matches its description.
Can I use Ultrathink 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 intellectronica/agent-skills --skill ultrathink -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ultrathink, .gemini/skills/ultrathink, .github/skills/ultrathink and .opencode/skills/ultrathink in your project.
What does Ultrathink need to run?
SKILL.md names no scripts, command-line tools or credentials: Ultrathink is instructions for the agent only.
Does Ultrathink 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 Ultrathink 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 Ultrathink use?
Ultrathink is published under the CC0-1.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Ultrathink use?
About 184 tokens (SKILL.md is roughly 736 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 Ultrathink?
Skills that share tags, products or a category with Ultrathink: Color Expert (nexu-io/open-design, 100k stars), Algorithmic Art (nexu-io/open-design, 100k stars), Algorithmic Art with p5.js (anthropics/skills, 180k stars) and Retina Display (thedaviddias/Front-End-Checklist, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Ultrathink?
intellectronica (a GitHub user) maintains it in intellectronica/agent-skills, which has 295 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on April 25, 2026.
Source: intellectronica/agent-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.