copilot-instructions: Instructions file for GitHub Copilot

.github/instructions/frontend.instructions.md

copilot-instructions frontend.instructions.md is an instructions file for GitHub Copilot from ThiagoGuislotti/copilot-instructions. It costs 2,538 tokens per session, scanned C, original, MIT.

Frontend development instructions for Vue applications, covering project structure, naming, components, composables, services, and styling.

In plain words
What is it for?
Guiding the design of Vue components, reactive composables, HTTP services, CSS classes, and feature modules.
Why use it?
They give developers shared rules for organizing and naming frontend code consistently.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file.

This is ThiagoGuislotti/copilot-instructions's own configuration. It tells GitHub Copilot how to work on copilot-instructions itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything copilot-instructions configures →

Reuse

Borrowing it

Nothing to install: this file belongs to ThiagoGuislotti/copilot-instructions. 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/ThiagoGuislotti/copilot-instructions/main/.github/instructions/frontend.instructions.md
Clone the repo
git clone --depth 1 https://github.com/ThiagoGuislotti/copilot-instructions

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.

agentmods badge for copilot-instructions frontend.instructions.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/thiagoguislotti/copilot-instructions/frontend/github.svg)](https://agentmods.dev/instructions/thiagoguislotti/copilot-instructions/frontend)
Your own site
<a href="https://agentmods.dev/instructions/thiagoguislotti/copilot-instructions/frontend"><img src="https://agentmods.dev/badge/instructions/thiagoguislotti/copilot-instructions/frontend/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.

agentmods 80×15 button for copilot-instructions frontend.instructions.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/thiagoguislotti/copilot-instructions/frontend"><img src="https://agentmods.dev/badge/instructions/thiagoguislotti/copilot-instructions/frontend.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 2,538 This file is loaded in full into every session.
When invoked 2,538 The same file — it is already loaded in full.
Security scan C 1 finding. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.02538 $0.02538
Opus 5.5 $0.01015 $0.01015
Sonnet 5.5 $0.00508 $0.00508
Haiku 4.5 $0.00254 $0.00254

Measured 1mo ago against content hash e9a663f3cd1b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

copilot-instructions frontend.instructions.md scanned grade C with 1 finding 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.

Hidden instructionshighPrompt injection

Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.

<!-- ✅ CORRECT: Design system utility when needed -->
.github/instructions/frontend.instructions.md · 327 lines

How it starts

The opening of the file, as written. The whole thing — 327 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Architecture

  • Hooks/composables for reactive logic
  • Presentational components using props and slots
  • Services for pure HTTP requests
  • Feature-first Clean Architecture: modules//{domain,application,infrastructure,presentation}
  • Shared resources: shared/{domain,application,infrastructure,presentation,utils,constants}
  • CSS in SFC: Keep component styles in <style scoped> within .vue files (Vue 3 best practice)
  • Prefer Quasar utilities: Use Quasar classes before writing custom CSS
const { rows } = useTablePaging(apiEndpoint);
<UserCard :user="u" v-slot:actions><button>Edit</button></UserCard>

Naming

  • Prefix composables with use*
  • Never use default exports
  • Avoid side effects on import
  • Component files in PascalCase: BaseButton.vue, SearchPage.vue
  • Composables in camelCase: useAuth.ts, useFormRules.ts
  • CSS classes in kebab-case: search-container, action-buttons
export function useAuth() { /* ... */ } // not export default
// Import modules without executing code automatically

Component Library Pattern

Base Component Naming

  • Prefix shared components with Base*: BaseButton, BaseInput, BaseCard
  • Use slots for flexible content injection
  • Expose consistent prop interfaces across components
  • Document props with JSDoc comments

Component Categories

components/
├── form/           # BaseInput, BaseSelect, BaseTextarea, BaseDatePicker, BaseTimePicker
├── layout/         # BaseHeader, BaseFooter, BaseSection, BaseHero, BaseSidebar
└── ui/             # BaseButton, BaseCard, BaseChip, BaseLogo, MetricCard, InfoCard

Export Pattern (Single Entry Point)

// index.ts
export { default as BaseButton } from './components/ui/BaseButton.vue'
export { default as BaseInput } from './components/form/BaseInput.vue'
export * from './composables/ui/useTheme'
export * from './config/theme.config'

Theme System

Multi-Theme Architecture

  • Define theme configuration interface with colors, fonts, gradients
  • Use CSS custom properties for runtime theme switching
  • Implement useTheme composable for reactive theme management
  • Store theme preference in localStorage

Read the full file on GitHub · 327 lines

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.

  1. 1mo ago First seen · 327 lines · 2,538 tokens per session scan C e9a663f3cd1b

Subscribe to this mod's changes

copilot-instructions frontend.instructions.md is an instructions file published in the GitHub repository ThiagoGuislotti/copilot-instructions (2 stars, last pushed 3mo ago), licensed MIT. It adds 2,538 tokens to every session, about $0.0102 per session on Opus 5.5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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