.NET agent skills for Claude Code, Codex and other agents.

Create agent skills for Microsoft technologies using official documentation.

MicrosoftDocs/mcp

Mines local Copilot CLI session logs for dotnet/maui to rank costly or failing runs, tag recurring failure modes, propose repo edits and emit guard evals.

dotnet/maui

Find working code samples, verify API signatures, and fix Microsoft SDK errors using official docs.

MicrosoftDocs/mcp

Audits and updates os-packages.json files listing the Linux packages each .NET release needs per distro, then regenerates the Markdown from the JSON.

dotnet/core

Resolves .NET runtime frames in Apple .ips crash logs to function names, source files and line numbers using dSYM symbols, atos and the Microsoft symbol server.

dotnet/skills

Audits and updates the supported-os.json files for .NET releases, checking them against upstream lifecycle data and regenerating the markdown with the release-notes tool.

dotnet/core

Reviews the tests added in a pull request for fix coverage, quality, edge cases and test type, and recommends lighter test types where they would do.

dotnet/maui

Validates .NET release data with the release-notes CLI: download URL liveness, SHA512 hashes, CDN latest.version files and aka.ms redirects.

dotnet/core

Resolves native crash frames from .NET Android tombstones to function names, source files and line numbers using BuildIds, Microsoft's symbol server and llvm-symbolizer.

dotnet/skills

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

Activate this skill when BenchmarkDotNet (BDN) is involved in the task — creating, running, configuring, or reviewing BDN benchmarks.

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

Interprets pinned managed benchmark evidence for a dotnet/maui pull request and writes a narrative for the performance review workflow, without running or publishing anything.

dotnet/maui

Understand Microsoft technologies by querying official documentation.

MicrosoftDocs/mcp

Prepare a release for the Feature Management .NET SDK. An agent skill from microsoft/FeatureManagement-Dotnet.

microsoft/FeatureManagement-Dotnet

Modify Cottle templates that generate Dockerfiles and READMEs in dotnet/dotnet-docker.

dotnet/dotnet-docker

Produces the changes.json manifest for a .NET preview, RC or GA milestone by choosing the right VMR base and head refs and running release-notes generate changes.

dotnet/core

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

dotnet/macios

Orchestrates Aspire distributed applications using the Aspire CLI for running, debugging, and managing distributed apps.

microsoft/aspire.dev

Add a new AWS event source attribute (e.g., Kinesis, Kafka, MQ) to the Lambda .NET Annotations framework, including the attribute class, source generator integration, CloudFormation writer, unit…

aws/aws-lambda-dotnet

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

Plan and move changes between branches in dotnet/dotnet-docker.

dotnet/dotnet-docker

Ranks the changes in a release manifest and writes a scored features file that release notes, docs and blog posts can each cut at their own threshold.

dotnet/core

Guide for organizing MSBuild infrastructure with Directory.Build.props, Directory.Build.targets, Directory.Packages.props, and Directory.Build.rsp.

microsoft/testfx

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

dotnet/macios

Update/bump the libdatadog native library version in dd-trace-dotnet.

DataDog/dd-trace-dotnet

Makes .NET projects compatible with Native AOT and trimming by resolving IL trim and AOT analyzer warnings through annotations rather than suppressions.

dotnet/skills

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

Audits a scored features.json file and its draft release notes against editorial examples to catch over-scored, under-scored, or missing entries.

dotnet/core

Adds MAUI-specific guardrails on top of the maestro-cli skill and Maestro MCP tools for darc, BAR, and channel or feed lookups in dotnet/maui.

dotnet/maui

Project-wide code coverage and CRAP (Change Risk Anti-Patterns) score analysis for .NET projects.

microsoft/testfx

Roll Playwright .NET to a new version

microsoft/playwright-dotnet

Configures automatic crash dumps or captures dumps from running processes for modern .NET apps on Linux, macOS and Windows, including Docker and Kubernetes.

dotnet/skills

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

Upgrade the PowerShell SDK version in the Azure Functions PowerShell language worker.

Azure/azure-functions-powershell-worker

Analyze Azure DevOps CI build failures in dd-trace-dotnet pipeline.

DataDog/dd-trace-dotnet

Run ApiChief in the EF Core repo to emit baselines, summaries, deltas, review files, or breaking-change checks.

dotnet/efcore

Verify whether an exact T-SQL script is already supported by SqlScriptDOM, then add or update the correct parser tests and baselines.

microsoft/SqlScriptDOM

Creates and maintains the per-distro JSON files that list the native packages .NET needs on each Linux distribution, scoped to one .NET version.

dotnet/core

Manages .NET Docker images including adding images for new .NET versions, new Linux distros (Alpine, Ubuntu, Azure Linux), and new Windows versions.

dotnet/dotnet-docker

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

Adds dotnet/maui-specific context for investigating failing PR checks and broken nightly builds: pipelines, Helix logs, binlogs and merge-readiness verdicts.

dotnet/maui

Guide for modernizing and migrating MSBuild project files to SDK-style format.

microsoft/testfx

Build, test, and validate changes in the vstest repository. An agent skill from microsoft/vstest.

microsoft/vstest