Cloudflare's component library for building modern web applications.
Kumo is Cloudflare's component library for building web application interfaces with accessible, design-system-compliant UI elements. Developers use it to add components with built-in keyboard navigation, focus management, and ARIA attributes, while advanced users can access re-exported Base UI primitives. Catalogue add-ons support the library's development workflow.
Latest release @cloudflare/[email protected] · 26 Oct 2026
2 files for Claude Code, Codex and OpenCode: index-knowledge, kumo AGENTS.md — 2,355 tokens loaded in every session.
AGENTS.md A 2,355 tok .agents/skills/index-knowledge/SKILL.md A 26 tok These files are cloudflare/kumo's own configuration — they tell Claude Code, Codex and OpenCode how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.