optimizing-msbuild-performance
openbooklet.com/s/optimizing-msbuild-performanceopenbooklet.com/s/optimizing-msbuild-performance@1.0.0GET /api/v1/skills/optimizing-msbuild-performanceGuides performance optimization for MSBuild engine code. Consult when working on hot paths in evaluation or execution, reducing allocations, choosing collection types, handling strings efficiently, modifying Expander.cs or Evaluator.cs, using Span<T>/stackalloc, caching values, or profiling build performance. Also applies when reviewing PRs for performance regression.
Guides assessment of backward compatibility for MSBuild changes. Consult when modifying behavior, adding warnings or errors, changing defaults, altering target ordering, removing or deprecating features, deciding whether a change needs a ChangeWave, reviewing blast radius of behavioral changes, or when a PR introduces user-visible output differences.
Guides authoring of MSBuild errors, warnings, and diagnostic messages. Consult when adding new MSBxxxx codes, writing or modifying user-facing diagnostic text, deciding between error/warning/message severity, working with Strings.resx resource files, formatting paths in error output, or evaluating whether a new warning could break WarnAsError builds.
Manage MSBuild Change Waves: create new waves, condition features behind opt-out flags, write tests for wave-gated features, document change waves in ChangeWaves.md, and retire expired waves. Use when adding changes that need an opt-out or rotating out old change waves. Changes that introduce a user-visible behavior change should consider whether to use a changewave.
Deploy locally-built MSBuild binaries into a Visual Studio installation for testing and debugging. Use when you need VS itself to use your local MSBuild changes, or when debugging MSBuild as invoked by VS.
Guides work on the SDK-MSBuild integration boundary. Consult when authoring or modifying SDK targets, working on dotnet CLI to MSBuild invocation, handling project-reference protocol, coordinating cross-repo changes with dotnet/sdk, debugging property resolution or import ordering, working on restore/build/publish/pack target chains, or dealing with Directory.Build.props/targets interaction.
Guides changes to MSBuild binary log infrastructure. Consult when modifying BinaryLogger or BinaryLogReplayEventSource, adding new BuildEventArgs types, changing event serialization/deserialization, modifying ProjectImportsCollector, adjusting message importance levels, or making changes that affect .binlog content. Also applies when verifying that behavioral changes are properly reflected in binary log output.
Review and merge open bot PRs: dependency updates from dotnet-maestro, codeflow from dotnet/dotnet, and OneLoc localization PRs. Produces a clickable dashboard with CI status, review state, and suspicious file flags. Use when you want to triage all open bot PRs in one pass.
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.
Check health of MSBuild CI pipelines, VS repo PR insertion statuses, and VMR codeflow PRs. Use when asked about pipeline health, build failures, infrastructure issues, CI status, insertion PR status, VMR codeflow status, or for periodic health monitoring.
Reviews MSBuild code changes using a 24-dimension methodology. Activates for code review, PR review, pull request analysis, design review, architecture review, code quality assessment, or style check of MSBuild code. Covers backwards compatibility, ChangeWave discipline, performance, allocation awareness, test coverage, error message quality, logging, string comparison, API surface, target authoring, cross-platform correctness, code simplification, concurrency, naming, SDK integration, evaluation model integrity, correctness, dependency management, security, and build infrastructure.
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.
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