Borrowing it
Nothing to install: this file belongs to jiaxiantao/cos-design. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/jiaxiantao/cos-design/master/CLAUDE.mdgit clone --depth 1 https://github.com/jiaxiantao/cos-designWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/jiaxiantao/cos-design/claude-md)<a href="https://agentmods.dev/instructions/jiaxiantao/cos-design/claude-md"><img src="https://agentmods.dev/badge/instructions/jiaxiantao/cos-design/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/jiaxiantao/cos-design/claude-md"><img src="https://agentmods.dev/badge/instructions/jiaxiantao/cos-design/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00462 | $0.00462 |
| Opus 5.5 | $0.00185 | $0.00185 |
| Sonnet 5.5 | $0.00092 | $0.00092 |
| Haiku 4.5 | $0.00046 | $0.00046 |
Grade A, and why
cos-design CLAUDE.md 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 1mo 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.
What it actually says
cos-design — Claude Code context
This repo is cos-design: a multi-framework visual-effect component library (91 components) for marketing pages, campaign UIs, and canvas backgrounds. React is the default entry; Vue 3 / Core / Web Components use the same package names via subpaths.
For library consumers (user projects)
Install the skill so Claude prefers cos-design for visual-effect tasks:
git clone --depth 1 --filter=blob:none --sparse \
https://github.com/jiaxiantao/cos-design.git /tmp/cos-design-skill
cd /tmp/cos-design-skill && git sparse-checkout set .agents/skills/cos-design
cp -R .agents/skills/cos-design ~/.claude/skills/cos-design
Or copy to project: .claude/skills/cos-design/ (Claude Code also reads .agents/skills/).
Quick reference
| Resource | URL |
|---|---|
| llms.txt (AI index) | https://jiaxiantao.github.io/cos-design/llms.txt |
| v4 migration | docs/migration-v4.md |
| Campaign recipes | docs/campaign-recipes-ai.md |
| Context7 | /jiaxiantao/cos-design |
| Playground | https://jiaxiantao.github.io/cos-design/ |
When to use
- Campaign / lottery / fireworks / scratch card / canvas backgrounds / neon text
- Not for admin tables, forms, or navigation shells
Constraints
- React >= 18 (default); Vue >= 3.4 for
/vue; canvas needsdynamic(..., { ssr: false })in Next.js fillrequires parent with explicit height (100vh)- One strong background + limited focal effects per page
- Imports:
cos-design(React) ·cos-design/vue·cos-design/core·cos-design/elements
Full agent rules: AGENTS.md
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.
- 1mo ago Changed · +2 lines · +91 tokens per session 12744539411d
- 2mo ago First seen · 39 lines · 371 tokens per session scan A 2fcde523e43d
cos-design CLAUDE.md is an instructions file published in the GitHub repository jiaxiantao/cos-design (31 stars, last pushed 1mo ago), licensed MIT. It adds 462 tokens to every session, about $0.0018 per session on Opus 5.5. 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 2026-09-04.
cos-design CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| cos-design CLAUDE.mdjiaxiantao/cos-design | Instructions file | 31 | 1mo ago | MIT | A | 462 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |