C# agent skills for Claude Code, Codex and other agents.

Scans C# and .NET code for about 50 performance anti-patterns and reports prioritized findings with concrete fixes, at a scan depth you choose.

dotnet/skills

A skill your agent uses when adding a new RCS diagnostic in roslynator (RCS0 formatting, RCS1 general, RCS9 code-analysis), wiring roslynator EditorConfig options, or when docs say CHANGELOG.md…

dotnet/roslynator

Review dotnet/macios PRs against established rules. An agent skill from dotnet/macios.

dotnet/macios

Statically pairs source files with test files to list code that no test references, using Roslyn for C# or tree-sitter for many languages, with no build.

dotnet/skills

A skill your agent uses when adding a Roslynator code fix for C compiler error CS or RCF, editing Diagnostics.xml or CodeFixes.xml, or when compiler-diagnostic-fixes-testing.md shows…

dotnet/roslynator

Investigate and triage CI failures for dotnet/macios from Azure DevOps build URLs.

dotnet/macios

A skill your agent uses when adding a new RR refactoring in roslynator, editing Refactorings.xml, registering in RefactoringContext, or when refactorings-testing.md shows XunitRefactoringVerifier —…

dotnet/roslynator

Create and evaluate VS Code file-based instructions (.instructions.md files).

dotnet/efcore

Update dotnet/macios to a new Xcode beta and validate it end-to-end.

dotnet/macios

A skill your agent uses when fixing a Roslynator analyzer false positive or false negative, RCS, RR, or CS/RCF regression, incorrect diagnostic reporting, or bug report citing a specific rule id —…

dotnet/roslynator

Roll Playwright .NET to a new version

microsoft/playwright-dotnet

A skill your agent uses when shipping a roslynator release, rolling CHANGELOG.md [Unreleased], updating the VS Code extension changelog, creating a GitHub v release, or optionally tagging cli-v.

dotnet/roslynator

Migrate Python apps from Azure OpenAI Chat Completions to the Responses API.

microsoft/ai-agents-for-beginners

Investigate and fix flaky/random CI test failures in dotnet/macios.

dotnet/macios

Migrate a .NET 8 project to .NET 9 and resolve all breaking changes.

dotnet/skills

Manage stacked branches and pull requests with the gh-stack GitHub CLI extension.

dotnet/macios

Create C bindings for Apple frameworks in dotnet/macios. An agent skill from dotnet/macios.

dotnet/macios

Migrate a .NET 9 project or solution to .NET 10 and resolve all breaking changes.

dotnet/skills

A skill your agent uses when obsoleting or retiring RCS, RR, or RCF in roslynator, replacing an analyzer with another id, or when tempted to use IsObsolete on an Analyzer entry — analyzers use…

dotnet/roslynator

Post-mortem analysis of CI failures across recent PRs in dotnet/macios.

dotnet/macios

Shift Python apps dem from Azure OpenAI Chat Completions go Responses API.

microsoft/ai-agents-for-beginners

Comprehensive tier assessment for an MCP SDK repository against SEP-1730.

modelcontextprotocol/conformance

Download updated expected app size files from Azure DevOps CI artifacts for the current branch.

dotnet/macios

Reviews C changes in the ImageBuilder codebase against the repo's modern C conventions and invariants.

dotnet/docker-tools

Writes and reviews Blazor .razor components with correct parameters, EventCallback, lifecycle, async and disposal patterns, for components that need no JavaScript interop.

dotnet/skills

Fix MSBuild targets that generate files during the build but those files are missing from compilation or output.

microsoft/testfx

Enable nullable reference types in a C project and systematically resolve all warnings.

dotnet/skills

Write, validate, and improve XML documentation comments in C source code.

dotnet/macios

Refactors C# and .NET code without changing behavior, using binding-aware edits plus a build and tests, and separating out or declining anything that alters behavior.

dotnet/skills

Guidance for .NET MAUI XAML and C data bindings — compiled bindings, INotifyPropertyChanged / ObservableObject, value converters, binding modes, multi-binding, relative bindings, fallbacks, and MVVM…

dotnet/skills

.NET MAUI safe area and edge-to-edge layout guidance for .NET 10+.

dotnet/skills

Guide for theming .NET MAUI apps — light/dark mode via AppThemeBinding, ResourceDictionary theme switching, DynamicResource bindings, system theme detection, and user theme preferences.

dotnet/skills

Migrate a .NET 10 project or solution to .NET 11 and resolve all breaking changes.

dotnet/skills

DO NOT INVOKE when the primary request explicitly asks to convert, migrate, modernize, or rewrite a legacy/old-style project to SDK style; use msbuild-modernization.

dotnet/skills

Guides creation and modification of ASP.NET Core Web API endpoints with correct HTTP semantics, OpenAPI metadata, and error handling.

dotnet/skills

Run file-based C apps with the .NET CLI when the user explicitly wants C/.NET code without creating a project.

dotnet/skills

ACTIVATION PREREQUISITE: the request or discovered target must explicitly identify C, .NET, .cs, or .csproj; otherwise stay dormant without invoking this skill.

dotnet/skills

DO NOT USE when the target already consumes an injected interface or built-in abstraction such as IFileSystem or TimeProvider, even if the request says "generate a wrapper"; no new wrapper is needed.

dotnet/skills

ALWAYS USE when asked to migrate, replace, or make testable existing C static calls with a named wrapper or built-in abstraction: DateTime.UtcNow/Now or DateTimeOffset.UtcNow to TimeProvider/IClock…

dotnet/skills

Helps find, inspect, and compare (at a high level) .NET project templates.

dotnet/skills

MUST USE for C/.NET deterministic tests that require the smallest production seam for DateTime/Task.Delay/File/Environment/Guid/Random, static API preservation, nested/parallel overrides, or no real…

dotnet/skills

Add, review, or fix JavaScript interop in Blazor components.

dotnet/skills

A skill your agent uses when the user asks about using Gemini in an enterprise environment or explicitly mentions Vertex AI, Google Cloud, or Agent Platform.

google/skills

Azure AI Search SDK for .NET (Azure.Search.Documents). An agent skill from microsoft/skills.

microsoft/skills

Use only for MSBuild failure investigation, build-performance analysis, or review of existing build XML/extension contracts.

dotnet/skills

.NET timezone handling guidance for C applications. An agent skill from github/awesome-copilot.

github/awesome-copilot

Implementation details for EF Core scaffolding (reverse engineering).

dotnet/efcore

Ensure that C types are documented with XML comments and follow best practices for documentation.

github/awesome-copilot