Agent skill

Composer UI

by dxos in dxos/dxos

A skill your agent uses when building or styling plugin UI with Composer's design system — the @dxos/react-ui packages.

Custom licenceAuto-check passedFrontend & Design

Install Composer UI

skills CLI
$ npx skills add dxos/dxos --skill composer-ui -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install dxos/dxos composer-ui --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/dxos/dxos.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/composer-ui .claude/skills/composer-ui && rm -rf skills-src

Use ~/.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/

Facts

Skill name
composer-ui
GitHub stars
525
Token cost
~9.3k tokens
SKILL.md length
3,807 words
Files
1
Skills in repo
41
Repo updated
First seen
Licence
Custom licence

At a glance

A skill your agent uses when building or styling plugin UI with Composer's design system — the @dxos/react-ui packages.

  • Works in 3 steps: Need a picker / combobox (choose from a… → A simple flat list (display rows,… → A reorderable / resizable / tiled…
  • Styling plugin UI with Composers design system — the @dxos/react-ui packages
  • SKILL.md covers Package family, Theme tokens, Sizing vs logical utilities… and Icons, plus 13 more sections
  • Calls curl and git

What it does

Composer UI is an agent skill from dxos/dxos. Use when building or styling plugin UI with Composer's design system — the @dxos/react-ui packages. Covers theme tokens, primitives (Panel/Card/List/Input/Button/Icon), the standard container layout (Panel + ScrollArea), lists/pickers/stacks, schema-driven forms, toolbar/menu wiring, reactivity (useObject), attention/density, translations, storybook setup, and before/after screenshots. The UI adjunct to the composer-plugins skill; consult it whenever you write a container/component, reach for a Tailwind color…

Its SKILL.md is about 9.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design, covering Design tokens, CSS and styling and Pull requests. It works with React, Tailwind CSS and Storybook. The repository describes itself as: TypeScript implementation of the DXOS protocols, SDK, toolchain and Composer.

When your agent uses it

  • Styling plugin UI with Composers design system — the @dxos/react-ui packages
  • Tasks that involve Design tokens
  • Tasks that involve CSS and styling

Example prompts

  • “/composer-ui”

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. Need a picker / combobox (choose from a set, typeahead)? Check for an existing one first —
  2. A simple flat list (display rows, selectable rows, or rows with per-row
  3. A reorderable / resizable / tiled collection of surfaces? Use the **Stack from

What it can do on your machine

Read from SKILL.md and the folder at commit f0fc12a. 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

    Shell commands in SKILL.md call:

    • curl
    • git

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use curl and git, which can reach the network depending on how they are called.

    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

Composer UI loads about 9.3k tokens when it runs. Until then it costs about 159 tokens; SKILL.md has 3,807 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~159
When it runs · the whole SKILL.md, loaded when a task matches
~9.3k

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 3,807 words (~9,289 tokens).

“How to consume Composer's design system (@dxos/react-ui*) from a plugin. This is the UI adjunct to [[composer-plugins]] (which owns plugin structure: capabilities, surfaces, schema, operations) and [[composite-components]] (which owns authoring new @dxos/react-ui primitives). When you're laying out a container, picking…”

— opening of SKILL.md by dxos, Custom licence
name
composer-ui

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/composer-ui of dxos/dxos.

Open the folder on GitHubat commit f0fc12a

Compare with similar skills

Composer UI 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.

Composer UI compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Composer UI this skilldxos/dxos525—~9.3kAutomated safety check: PassCustom licence
Extract DesignManavarya09/design-extract4.2k—~786Automated safety check: NotesMIT
Tailwind V4 Shadcnever-works/ever-works1582 repos~3.8kAutomated safety check: PassMIT
Shadcn Tailwind UILiarMTTT/TavernWeave150—~1.7kAutomated safety check: PassCustom licence
Shift UI Componentsshift-editor/shift347—~2.5kAutomated safety check: PassApache-2.0
Light Frontend DesignLight0305/Light-skills641—~3.1kAutomated safety check: PassMIT

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Questions about Composer UI

What does Composer UI do?

A skill your agent uses when building or styling plugin UI with Composer's design system — the @dxos/react-ui packages. Composer UI is an agent skill from dxos/dxos. Use when building or styling plugin UI with Composer's design system — the @dxos/react-ui packages.

When should I use Composer UI?

Composer UI fits situations like: styling plugin UI with Composers design system — the @dxos/react-ui packages; tasks that involve Design tokens; tasks that involve CSS and styling.

How do I install Composer UI in Claude Code?

Run `npx skills add dxos/dxos --skill composer-ui -a claude-code`. Or copy the skill folder (.agents/skills/composer-ui in dxos/dxos) into .claude/skills/composer-ui in your project. Claude Code loads it when a task matches its description.

How do I install Composer UI in Codex?

Run `npx skills add dxos/dxos --skill composer-ui -a codex`. Or copy the skill folder (.agents/skills/composer-ui in dxos/dxos) into .agents/skills/composer-ui in your project. Codex loads it when a task matches its description.

Can I use Composer UI 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 dxos/dxos --skill composer-ui -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/composer-ui, .gemini/skills/composer-ui, .github/skills/composer-ui and .opencode/skills/composer-ui in your project.

What does Composer UI need to run?

Going by SKILL.md and its folder, Composer UI needs the command-line tools its instructions call (curl and git).

Does Composer UI access the network?

SKILL.md contains no URLs. Its commands use curl and git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Composer UI 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 Composer UI use?

Composer UI 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 Composer UI use?

About 9.3k tokens (SKILL.md is roughly 37k 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 Composer UI?

Skills that share tags, products or a category with Composer UI: Extract Design (Manavarya09/design-extract, 4.2k stars), Tailwind V4 Shadcn (ever-works/ever-works, 158 stars), Shadcn Tailwind UI (LiarMTTT/TavernWeave, 150 stars) and Shift UI Components (shift-editor/shift, 347 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Composer UI?

dxos (a GitHub organization) maintains it in dxos/dxos, which has 525 GitHub stars. The repository holds 41 skills in this directory. The repository was last updated on October 8, 2026.

Source: dxos/dxos on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.