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maui: Instructions file for GitHub Copilot

.github/copilot-instructions.md

maui copilot-instructions.md is an instructions file for GitHub Copilot from dotnet/maui. It costs 5,990 tokens per session, scanned A, original, MIT.

Repository guidance for GitHub Copilot working on .NET MAUI, a framework for building Android, iOS, macOS, and Windows apps from shared C# and XAML code.

In plain words
What is it for?
Use it when changing .NET MAUI code, selecting the correct .NET SDK or branch, following the build system, or reviewing a pull request.
Why use it?
It gives the agent the repository's expected development, versioning, build, and review context instead of leaving those decisions implicit.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file.

This is dotnet/maui's own configuration. It tells GitHub Copilot how to work on maui 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 maui configures →

not rated 23krepo +3 changed 23d ago A scan 5,990 tokens original MIT
View source ↗ dotnet/maui dot.net
About the project

.NET MAUI is a C# and XAML framework for building native mobile and desktop applications from one shared codebase. Developers use it to create apps for Android, iOS, iPadOS, macOS, and Windows. The catalogue entries provide skills, instructions, and agents for working with .NET MAUI.

dotnet/maui · 23,322 stars · on GitHub · dot.net

Reuse

Borrowing it

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

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.

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README.md
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Your own site
<a href="https://agentmods.dev/instructions/dotnet/maui/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/dotnet/maui/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.

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<a href="https://agentmods.dev/instructions/dotnet/maui/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/dotnet/maui/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 5,990 This file is loaded in full into every session.
When invoked 5,990 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.05990 $0.05990
Opus 5.5 $0.02396 $0.02396
Sonnet 5.5 $0.01198 $0.01198
Haiku 4.5 $0.00599 $0.00599

Measured 23d ago against content hash b0cb8de928ad, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

maui 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 23d 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 · 394 lines

How it starts

The opening of the file, as written. The whole thing — 394 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GitHub Copilot Development Environment Instructions

This document provides specific guidance for GitHub Copilot when working on the .NET MAUI repository. It serves as context for understanding the project structure, development workflow, and best practices.

Code Review Instructions

When performing a code review on PRs that change functional code, run the pr-finalize skill to verify that the PR title and description accurately match the actual implementation. This ensures proper documentation and helps maintain high-quality commit messages.

Repository Overview

.NET MAUI is a cross-platform framework for creating mobile and desktop applications with C# and XAML. This repository contains the core framework code that enables development for Android, iOS, iPadOS, macOS, and Windows from a single shared codebase.

Key Technologies

  • .NET SDK - Version is ALWAYS defined in global.json at repository root
    • main branch: Latest stable .NET version
    • Feature branches: Each netN.0 branch targets the .NET N SDK. By convention, the highest netN.0 branch is the current development branch for new features and API changes.
  • Cake build system for compilation and packaging (dotnet cake)
  • MSBuild with custom build tasks (must build Microsoft.Maui.BuildTasks.slnf first)
  • Testing frameworks:
    • xUnit - Unit tests (*.UnitTests.csproj)
    • NUnit - UI tests (TestCases.Shared.Tests)
    • Appium WebDriver - UI test automation

Development Environment Setup

This guidance assumes:

  • Repository is already cloned and tools are restored (dotnet tool restore completed)
  • Build tasks are compiled (Microsoft.Maui.BuildTasks.slnf built successfully)
  • Correct .NET SDK version installed (verify with dotnet --version against global.json)

Platform-Specific Requirements

  • Android: OpenJDK 17 + Android SDK (install via android command after dotnet tool restore)
  • iOS/macOS: Xcode (current stable version)
  • Windows: Windows SDK

Read the full file on GitHub · 394 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. 23d ago Changed · +8 lines · +82 tokens per session b0cb8de928ad
  2. 1mo ago Changed · +7 lines · +54 tokens per session 39f47d87651a
  3. 1mo ago First seen · 379 lines · 5,854 tokens per session scan A 01b3ceed1317

Subscribe to this mod's changes

maui copilot-instructions.md is an instructions file published in the GitHub repository dotnet/maui (23,322 stars, last pushed today), licensed MIT. It adds 5,990 tokens to every session, about $0.0240 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 2026-08-30.

LanguagesMobiledotnethacktoberfestmauimicrosoftmulti-platformuser-interface
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