From f1e4b465bfa4cc10adbcc7352ab39e94b785621a Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 15 Jan 2026 21:36:04 +0000
Subject: [PATCH 1/2] Initial plan


From cf4dc96892d62d8d040615ac5d3440fa9d09098a Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 15 Jan 2026 22:05:54 +0000
Subject: [PATCH 2/2] Remove DisablePackageBaselineValidation from project
 files

Co-authored-by: MihaZupan <25307628+MihaZupan@users.noreply.github.com>
---
 docs/coding-guidelines/project-guidelines.md                 | 2 +-
 .../System.IO.Ports/pkg/runtime.native.System.IO.Ports.props | 2 --
 .../src/System.Linq.AsyncEnumerable.csproj                   | 5 -----
 .../Microsoft.NET.Runtime.WebAssembly.Templates.csproj       | 2 +-
 src/tools/illink/src/linker/Mono.Linker.csproj               | 4 ----
 5 files changed, 2 insertions(+), 13 deletions(-)

diff --git a/docs/coding-guidelines/project-guidelines.md b/docs/coding-guidelines/project-guidelines.md
index ca72ec4e2c1ce4..5ec42d75c9c0d0 100644
--- a/docs/coding-guidelines/project-guidelines.md
+++ b/docs/coding-guidelines/project-guidelines.md
@@ -78,7 +78,7 @@ By default, packable project (mostly source projects) have APICompat package val
 This also includes _package baseline validation_ which automatically restores a previously produced package version (from the NuGet feeds) of the project and compares the public API to guard against breaking changes.
 
 When adding a brand new library, package baseline validation needs to be disabled temporarily as there's no previously produced package available yet. This should be done
-by setting the `DisablePackageBaselineValidation` property to true: https://github.com/dotnet/runtime/blob/634641c806b129bd6892e071aece3f4916ea519d/src/libraries/System.Linq.AsyncEnumerable/src/System.Linq.AsyncEnumerable.csproj#L14-L17
+by setting the `DisablePackageBaselineValidation` property to true.
 
 ## TargetFramework conditions
 `TargetFramework` conditions should be avoided in the first PropertyGroup as that causes DesignTimeBuild issues: https://github.com/dotnet/project-system/issues/6143
diff --git a/src/libraries/System.IO.Ports/pkg/runtime.native.System.IO.Ports.props b/src/libraries/System.IO.Ports/pkg/runtime.native.System.IO.Ports.props
index c0b3f6bac390dd..deee46a1e4c120 100644
--- a/src/libraries/System.IO.Ports/pkg/runtime.native.System.IO.Ports.props
+++ b/src/libraries/System.IO.Ports/pkg/runtime.native.System.IO.Ports.props
@@ -12,8 +12,6 @@
     <UseRuntimePackageDisclaimer>true</UseRuntimePackageDisclaimer>
     <!-- This is a native package and doesn't contain any ref/lib assets. -->
     <NoWarn>$(NoWarn);NU5128</NoWarn>
-    <!-- Disabling baseline validation since this is  binary blob -nd we do not need API compat. -->
-    <DisablePackageBaselineValidation>true</DisablePackageBaselineValidation>
     <PackageReadmeFilePath>$(MSBuildThisFileDirectory)../src/PACKAGE.md</PackageReadmeFilePath>
   </PropertyGroup>
 
diff --git a/src/libraries/System.Linq.AsyncEnumerable/src/System.Linq.AsyncEnumerable.csproj b/src/libraries/System.Linq.AsyncEnumerable/src/System.Linq.AsyncEnumerable.csproj
index 62dda55139c872..bcca9244ad0be6 100644
--- a/src/libraries/System.Linq.AsyncEnumerable/src/System.Linq.AsyncEnumerable.csproj
+++ b/src/libraries/System.Linq.AsyncEnumerable/src/System.Linq.AsyncEnumerable.csproj
@@ -10,11 +10,6 @@
     <!-- Due to heavy use of callbacks, ConfigureAwait(false) should not be used.
          The callbacks should be allowed to run in the original context. -->
     <NoWarn>$(NoWarn);CA2007</NoWarn>
-
-    <!-- Disabling baseline validation since this is a brand new package.
-         Once this package has shipped a stable version, the following line
-         should be removed in order to re-enable validation. -->
-    <DisablePackageBaselineValidation>true</DisablePackageBaselineValidation>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/mono/wasm/templates/Microsoft.NET.Runtime.WebAssembly.Templates.csproj b/src/mono/wasm/templates/Microsoft.NET.Runtime.WebAssembly.Templates.csproj
index b1bae872a5ba21..8ac9749e9e9c5c 100644
--- a/src/mono/wasm/templates/Microsoft.NET.Runtime.WebAssembly.Templates.csproj
+++ b/src/mono/wasm/templates/Microsoft.NET.Runtime.WebAssembly.Templates.csproj
@@ -2,6 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>$(NetCoreAppToolCurrent)</TargetFramework>
+    <IsShipping>false</IsShipping>
 
     <PackageType>Template</PackageType>
     <!-- when changing the net version also change it in template.json in the templates -->
@@ -17,7 +18,6 @@
     <NoWarn>$(NoWarn);NU5128</NoWarn>
     <IsPackable>true</IsPackable>
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
-    <DisablePackageBaselineValidation>true</DisablePackageBaselineValidation>
     <!-- TODO: Add package readme -->
     <EnableDefaultPackageReadmeFile>false</EnableDefaultPackageReadmeFile>
   </PropertyGroup>
diff --git a/src/tools/illink/src/linker/Mono.Linker.csproj b/src/tools/illink/src/linker/Mono.Linker.csproj
index 35293cd7078a82..23b0c616a11b0c 100644
--- a/src/tools/illink/src/linker/Mono.Linker.csproj
+++ b/src/tools/illink/src/linker/Mono.Linker.csproj
@@ -9,10 +9,6 @@
     <IsPackable>true</IsPackable>
     <IsShipping>false</IsShipping>
     <PackageId>Microsoft.NET.ILLink</PackageId>
-    <!-- Disabling baseline validation since this is a brand new package.
-       Once this package has shipped a stable version, the following line
-       should be removed in order to re-enable validation. -->
-    <DisablePackageBaselineValidation>true</DisablePackageBaselineValidation>
     <!-- There are currently no translations, so the satellite assemblies are a waste of space. -->
     <EnableXlfLocalization>false</EnableXlfLocalization>
     <NoWarn Condition="'$(DotNetBuildSourceOnly)' == 'true'">$(NoWarn);CS8524</NoWarn>