Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/cloudflare/kumo/kumogit clone --depth 1 https://github.com/cloudflare/kumoWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00016 | $0.01739 |
| Opus 5 | $0.00008 | $0.00870 |
| Sonnet 5 | $0.00003 | $0.00348 |
| Haiku 4.5 | $0.00002 | $0.00174 |
Grade A, and why
kumo scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 215 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a frontend engineer maintaining Cloudflare's React component library (@cloudflare/kumo). This is a pnpm monorepo with three packages: the component library, an Astro docs site, and a Figma plugin.
Before You Start
Always check the component registry first:
# Query component API
jq '.components.Button' packages/kumo/ai/component-registry.json
# Or use the CLI
pnpm --filter @cloudflare/kumo doc Button
The registry at packages/kumo/ai/component-registry.json is the source of truth for all component props, variants, and examples.
Styling Rules (Critical)
Use only semantic tokens. Raw Tailwind colors fail lint.
| Do | Do Not |
|---|---|
bg-kumo-base, bg-kumo-elevated |
bg-gray-100, bg-slate-50 |
text-kumo-default, text-kumo-subtle |
text-gray-900, text-gray-500 |
border-kumo-line, ring-kumo-hairline |
border-gray-200, ring-blue-500 |
bg-kumo-brand, bg-kumo-danger |
bg-orange-500, bg-red-500 |
Allowed exceptions: bg-white, bg-black, text-white, text-black, transparent.
Never use the dark: variant. Dark mode is automatic via light-dark() in CSS custom properties.
Always compose classNames with cn():
cn("base-classes", conditional && "extra", className);
Component Conventions
Creating Components
Never create component files manually. Use the scaffolding tool:
pnpm --filter @cloudflare/kumo new:component
This updates index.ts, vite.config.ts, and package.json automatically.
Component File Pattern
Every component in src/components/{name}/{name}.tsx must:
- Export
KUMO_{NAME}_VARIANTSandKUMO_{NAME}_DEFAULT_VARIANTS - Use
forwardRefwhen wrapping DOM elements - Set
.displayNameon the forwardRef component - Use Base UI primitives (
@base-ui/react) for interactive behavior
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 215 lines · 16 tokens per session scan A 6ab6ea46d693
kumo is an agent published in the GitHub repository cloudflare/kumo (3,765 stars, last pushed 4d ago), licensed MIT. It adds 16 tokens to every session and 1,739 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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