Individual skill

property-patterns

Diagnose and fix concrete MSBuild property defects in projects and existing shared-file hierarchies. USE FOR: conditions, defaults, append versus overwrite, last-write-wins values, OS/TFM checks, portable paths, normalization, and reviews centered on those property defects. Property defects in Directory.Build.* remain in scope, including overwritten values across parent/child imports and conditions that run before TargetFramework is set, even when the fix changes import order or moves a property group to .targets. DO NOT USE FOR: placement-only or import-only requests with no concrete property defect, such as discovering shared files or choosing which file owns a target or customization (use directory-build-organization); item operations; target structure; broad reviews without a concrete property defect; non-MSBuild work.

plugins/dotnet-msbuild/skills/property-patterns/SKILL.md

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# MSBuild Property Patterns

Canonical property definition and manipulation patterns from the MSBuild repository.

## Conditional Defaults — The Foundational Pattern

Set a property **only if not already set**, allowing callers to override:

```xml
<PropertyGroup>
  <Configuration Condition="'$(Configuration)' == ''">Debug</Configuration>
  <Platform Condition="'$(Platform)' == ''">AnyCPU</Platform>
  <BuildInParallel Condition="'$(BuildInParallel)' == ''">true</BuildInParallel>
</PropertyGroup>