coss ui is a component library built on Base UI with a shadcn-like developer experience plus a large particle catalog.
Coss is a community-contributed Claude Code skill in the accessibility sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/coss/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when building UIs with coss primitives (buttons, dialogs, selects, forms, menus, tabs, inputs, toasts, etc.), migrating from shadcn/Radix to coss/Base UI, composing trigger-based overlays, or troubleshooting coss component behavior.
The Coss Claude Code skill is built for product managers, product designers, and cross-functional teams planning, shipping, and measuring product features. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 69,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/coss curl -L https://claudskills.com/skills/coss/SKILL.md \ -o ~/.claude/skills/coss/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/coss/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/coss/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\coss\SKILL.md on Windows. See the full install guide for step-by-step instructions.
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
Browse all Product skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.