From 030b4bdbf3657863e5e6e533455a1e248cb861fe Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 30 Jan 2026 22:08:18 +0000
Subject: [PATCH 1/3] Initial plan


From 57de0aa75a1b7896470fd68724ae224325803f1e Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 30 Jan 2026 22:14:48 +0000
Subject: [PATCH 2/3] Skip .NET Framework tests on non-Windows platforms

- Configure TargetFrameworks to conditionally include net472 only on Windows
- Remove mono setup steps from CI workflow

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
---
 .github/workflows/ci-build-test.yml                      | 9 ---------
 .../TestServerWithHosting/TestServerWithHosting.csproj   | 3 ++-
 .../ModelContextProtocol.TestServer.csproj               | 3 ++-
 .../ModelContextProtocol.Tests.csproj                    | 3 ++-
 4 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/.github/workflows/ci-build-test.yml b/.github/workflows/ci-build-test.yml
index 37ee6ab83..70e768761 100644
--- a/.github/workflows/ci-build-test.yml
+++ b/.github/workflows/ci-build-test.yml
@@ -47,15 +47,6 @@ jobs:
           10.0.x
           9.0.x
 
-    # NetFX testing on non-Windows requires mono
-    - name: 🔧 Setup Mono
-      if: runner.os == 'Linux'
-      run: sudo apt-get install -y mono-devel
-
-    - name: 🔧 Setup Mono on macOS
-      if: runner.os == 'macOS'
-      run: brew install mono
-
     - name: 🔧 Set up Node.js
       uses: actions/setup-node@6044e13b5dc448c55e2357c09f80417699197238 # v6.2.0
       with:
diff --git a/samples/TestServerWithHosting/TestServerWithHosting.csproj b/samples/TestServerWithHosting/TestServerWithHosting.csproj
index 7967395c0..3d2fd870b 100644
--- a/samples/TestServerWithHosting/TestServerWithHosting.csproj
+++ b/samples/TestServerWithHosting/TestServerWithHosting.csproj
@@ -2,7 +2,8 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net10.0;net9.0;net8.0;net472</TargetFrameworks>
+    <TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>
+    <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('Windows'))">$(TargetFrameworks);net472</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <PublishAot Condition="'$(TargetFramework)' == 'net9.0'">true</PublishAot>
diff --git a/tests/ModelContextProtocol.TestServer/ModelContextProtocol.TestServer.csproj b/tests/ModelContextProtocol.TestServer/ModelContextProtocol.TestServer.csproj
index c4b39bb54..b874c0385 100644
--- a/tests/ModelContextProtocol.TestServer/ModelContextProtocol.TestServer.csproj
+++ b/tests/ModelContextProtocol.TestServer/ModelContextProtocol.TestServer.csproj
@@ -2,7 +2,8 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net10.0;net9.0;net8.0;net472</TargetFrameworks>
+    <TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>
+    <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('Windows'))">$(TargetFrameworks);net472</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <AssemblyName>TestServer</AssemblyName>
diff --git a/tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj b/tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj
index e0fb3d1fa..8f44ba5f6 100644
--- a/tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj
+++ b/tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj
@@ -2,7 +2,8 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net10.0;net9.0;net8.0;net472</TargetFrameworks>
+    <TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>
+    <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('Windows'))">$(TargetFrameworks);net472</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
 

From 6a2bb115cdd94f60e6f2539df448a6277745c775 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 30 Jan 2026 22:28:38 +0000
Subject: [PATCH 3/3] Consolidate test target frameworks into
 Directory.Build.props

Define DefaultTestTargetFrameworks in root Directory.Build.props with
conditional net472 on Windows, then reference it from the test projects.

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
---
 Directory.Build.props                                       | 6 ++++++
 samples/TestServerWithHosting/TestServerWithHosting.csproj  | 3 +--
 .../ModelContextProtocol.TestServer.csproj                  | 3 +--
 .../ModelContextProtocol.Tests.csproj                       | 3 +--
 4 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/Directory.Build.props b/Directory.Build.props
index 390be36e7..f5cdd3aad 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -45,4 +45,10 @@
     <!-- Don't use x64 when running netfx test procs on Windows ARM -->
     <PreferNativeArm64>true</PreferNativeArm64>
   </PropertyGroup>
+
+  <PropertyGroup>
+    <!-- Shared target frameworks for test projects and test support projects. net472 is only included on Windows. -->
+    <DefaultTestTargetFrameworks>net10.0;net9.0;net8.0</DefaultTestTargetFrameworks>
+    <DefaultTestTargetFrameworks Condition="$([MSBuild]::IsOSPlatform('Windows'))">$(DefaultTestTargetFrameworks);net472</DefaultTestTargetFrameworks>
+  </PropertyGroup>
 </Project>
diff --git a/samples/TestServerWithHosting/TestServerWithHosting.csproj b/samples/TestServerWithHosting/TestServerWithHosting.csproj
index 3d2fd870b..9eca173cf 100644
--- a/samples/TestServerWithHosting/TestServerWithHosting.csproj
+++ b/samples/TestServerWithHosting/TestServerWithHosting.csproj
@@ -2,8 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>
-    <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('Windows'))">$(TargetFrameworks);net472</TargetFrameworks>
+    <TargetFrameworks>$(DefaultTestTargetFrameworks)</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <PublishAot Condition="'$(TargetFramework)' == 'net9.0'">true</PublishAot>
diff --git a/tests/ModelContextProtocol.TestServer/ModelContextProtocol.TestServer.csproj b/tests/ModelContextProtocol.TestServer/ModelContextProtocol.TestServer.csproj
index b874c0385..229c57d60 100644
--- a/tests/ModelContextProtocol.TestServer/ModelContextProtocol.TestServer.csproj
+++ b/tests/ModelContextProtocol.TestServer/ModelContextProtocol.TestServer.csproj
@@ -2,8 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>
-    <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('Windows'))">$(TargetFrameworks);net472</TargetFrameworks>
+    <TargetFrameworks>$(DefaultTestTargetFrameworks)</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <AssemblyName>TestServer</AssemblyName>
diff --git a/tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj b/tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj
index 8f44ba5f6..efc3527b4 100644
--- a/tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj
+++ b/tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj
@@ -2,8 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>
-    <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('Windows'))">$(TargetFrameworks);net472</TargetFrameworks>
+    <TargetFrameworks>$(DefaultTestTargetFrameworks)</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>