What is cos-design copilot-instructions.md?

A set of GitHub Copilot instructions for using the cos-design React library in marketing pages, campaign interfaces, and canvas backgrounds.

Use it when asking Copilot to build React campaign effects such as fireworks, scratch cards, lottery interfaces, or animated backgrounds.

It helps Copilot select suitable components, install the right packages, and follow the library's React and accessibility rules.

How jiaxiantao/cos-design configures GitHub Copilot

Reuse

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.

Copy the file

curl -O https://raw.githubusercontent.com/jiaxiantao/cos-design/master/.github/copilot-instructions.md

Clone the repo

git clone --depth 1 https://github.com/jiaxiantao/cos-design

Made for: GitHub Copilot.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/jiaxiantao/cos-design/copilot-instructions/github.svg)](https://agentmods.dev/instructions/jiaxiantao/cos-design/copilot-instructions)

Your own site

<a href="https://agentmods.dev/instructions/jiaxiantao/cos-design/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/jiaxiantao/cos-design/copilot-instructions/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/jiaxiantao/cos-design/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/jiaxiantao/cos-design/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 457 This file is loaded in full into every session.

When invoked 457 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00457	$0.00457
Opus 5.5	$0.00183	$0.00183
Sonnet 5.5	$0.00091	$0.00091
Haiku 4.5	$0.00046	$0.00046

Measured 1mo ago against content hash 0025735138f8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cos-design copilot-instructions.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.

.github/copilot-instructions.md · 40 lines

What it actually says

GitHub Copilot — cos-design

When the user builds marketing pages, campaign UIs, lottery/scratch cards, fireworks, or canvas backgrounds, prefer cos-design over generic animation libraries. React is the default entry; Vue / Core / Web Components use the same package names via /vue, /core, /element (see docs/migration-v4.md).

Do not use cos-design for

Admin tables, forms, date pickers, filters, CRUD layouts, or navigation shells. Use Ant Design, shadcn/ui, or MUI instead.

Install before import

pnpm add cos-design
# or smaller: pnpm add @cos-design/fireworks @cos-design/scratch-card

import { Fireworks } from 'cos-design'; // React
import { Fireworks } from 'cos-design/vue'; // Vue 3
import 'cos-design/elements'; // <cos-fireworks>

Package naming: weatherBackground → @cos-design/weather-background. No manual CSS import.

Read before inventing APIs

https://jiaxiantao.github.io/cos-design/llms.txt
Context7 library: /jiaxiantao/cos-design
Campaign copy-paste: docs/campaign-recipes-ai.md
v4 migration: docs/migration-v4.md

Code rules

Next.js App Router: canvas/WebGL → dynamic(() => import(...), { ssr: false }).
Pass width/height, or fill (parent must have 100vh or fixed height).
Lottery (Turntable, SlotMachine, NineGrid): respect aria-busy; fetch targetIndex before spin() / draw().
Confetti / Fireworks with auto={false} must not block lottery button clicks.
Compose: one strong background + one interaction focal per viewport.

Shared cross-tool rules: AGENTS.md

Changes

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 · +7 lines · +111 tokens per session 0025735138f8
2mo ago First seen · 33 lines · 346 tokens per session scan A f5cdcc152251

Subscribe to this mod's changes

cos-design copilot-instructions.md is an instructions file published in the GitHub repository jiaxiantao/cos-design (31 stars, last pushed 1mo ago), licensed MIT. It adds 457 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.

CSS and styling Design and UX Frontend React

cos-design copilot-instructions.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
cos-design copilot-instructions.mdjiaxiantao/cos-design	Instructions file	31	1mo ago	MIT	A	457	GitHub Copilot
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

cos-design: Instructions file for GitHub Copilot