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Guide for testing bug reproductions against locally-built MSBuild. Use this when you have a repro project and want to verify a fix works before submitting a PR.
デフォルトでは、最初にソースを確認する Prompt が選択されています。直接コマンドに切り替えるか、ローカルコピーをダウンロードすることもできます。
インストールを決める前に、SKILL.md と SkillsMP に表示されている付属ファイルをお読みください。
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
直接コマンドでは確認用 Prompt が省略されます。実行前にソースを確認してください。
npx skills add https://github.com/dotnet/msbuild --skill use-bootstrap-msbuildコマンドは1行のまま表示されます。コピー前に横へスクロールして全体を確認してください。
ローカルで確認しますか？SkillsMP が現在取得できるファイルをダウンロードできます。
Orchestrate an MSBuild release: create the tracking issue, branch, configure DARC channels and subscriptions, bump version in main, final-brand the release branch, insert into VS, and publish post-GA. Covers the full monthly release lifecycle aligned with VS shipping cadence.
Guide for running MSBuild unit tests efficiently. Use when running, scoping, filtering, or speeding up unit tests in this repository, or when finalizing a change with a heavier validation pass. Covers xUnit v3 + Microsoft.Testing.Platform (MTP) specifics and which `dotnet test` flags do and don't apply.
Guide for migrating MSBuild tasks to multithreaded mode support, including compatibility red-team review. Use this when converting tasks to thread-safe versions, implementing IMultiThreadableTask, adding TaskEnvironment support, or auditing migrations for behavioral compatibility.
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SKILL.md を表示中
| name | use-bootstrap-msbuild |
| description | Guide for testing bug reproductions against locally-built MSBuild. Use this when you have a repro project and want to verify a fix works before submitting a PR. |
This skill guides you through testing a bug reproduction project against your locally-built MSBuild to verify a fix.
After making changes to MSBuild, you need to test them against a repro project. The "bootstrap" is a self-contained MSBuild installation built from your local changes. It includes all dependencies needed to build real projects.
Build MSBuild to create the bootstrap directory:
# Windows
.\build.cmd
# Unix/macOS
./build.sh
This creates the bootstrap at artifacts\bin\bootstrap\ with your changes.
Rerun this after making any code change. If run in the default mode, there may be some errors on subsequent builds about locked files (due to MSBuild worker node processes lingering). If so, run ./artifacts/bin/bootstrap/core/dotnet build-server shutdown.
Use the bootstrap dotnet CLI directly (preferred):
# Windows
artifacts\bin\bootstrap\core\dotnet.exe build <path-to-repro.csproj>
# Unix/macOS
./artifacts/bin/bootstrap/core/dotnet build <path-to-repro.csproj>
All of the usual command line arguments should work, including -bl to create binlogs.
If the problem is specific to the .NET Framework MSBuild.exe that is used in Visual Studio, and you're running on Windows, you can use the bootstrap MSBuild.exe directly:
artifacts\bin\bootstrap\net472\MSBuild\Current\Bin\MSBuild.exe <path-to-repro.csproj>
Note: The .NET Framework bootstrap output will only be complete when built on Windows using MSBuild.exe.
artifacts\bin\bootstrap\core\sdk\*\MSBuild.dll timestamp./artifacts/bin/bootstrap/core/dotnet build-server shutdown
# Or use the helper function after sourcing msbuild-build-env.ps1
killdotnet
Your fix is working! The repro uses your local changes while the installed MSBuild has the bug.
| Scenario | Command |
|---|---|
| Build bootstrap | .\build.cmd |
| .NET Core repro | artifacts\bin\bootstrap\core\dotnet.exe build <project> |
| .NET Framework repro | artifacts\bin\bootstrap\net472\MSBuild\Current\Bin\MSBuild.exe <project> |