diff --git a/csharp/autobuilder/Semmle.Autobuild.Shared/Autobuilder.cs b/csharp/autobuilder/Semmle.Autobuild.Shared/Autobuilder.cs
index e3889c550c9f..4c8e5124a4cc 100644
--- a/csharp/autobuilder/Semmle.Autobuild.Shared/Autobuilder.cs
+++ b/csharp/autobuilder/Semmle.Autobuild.Shared/Autobuilder.cs
@@ -19,6 +19,12 @@ public interface IBuildRule
         BuildScript Analyse(Autobuilder builder, bool auto);
     }
 
+    /// <summary>
+    /// A delegate used to wrap a build script in an environment where an appropriate
+    /// version of .NET Core is automatically installed.
+    /// </summary>
+    public delegate BuildScript WithDotNet(Autobuilder builder, Func<IDictionary<string, string>?, BuildScript> f);
+
     /// <summary>
     /// Exception indicating that environment variables are missing or invalid.
     /// </summary>
diff --git a/csharp/autobuilder/Semmle.Autobuild.Shared/BuildCommandAutoRule.cs b/csharp/autobuilder/Semmle.Autobuild.Shared/BuildCommandAutoRule.cs
index 2ef98609512b..8677d1269a1e 100644
--- a/csharp/autobuilder/Semmle.Autobuild.Shared/BuildCommandAutoRule.cs
+++ b/csharp/autobuilder/Semmle.Autobuild.Shared/BuildCommandAutoRule.cs
@@ -11,9 +11,9 @@ namespace Semmle.Autobuild.Shared
     /// </summary>
     public class BuildCommandAutoRule : IBuildRule
     {
-        private readonly Func<Autobuilder, Func<IDictionary<string, string>?, BuildScript>, BuildScript> withDotNet;
+        private readonly WithDotNet withDotNet;
 
-        public BuildCommandAutoRule(Func<Autobuilder, Func<IDictionary<string, string>?, BuildScript>, BuildScript> withDotNet)
+        public BuildCommandAutoRule(WithDotNet withDotNet)
         {
             this.withDotNet = withDotNet;
         }
diff --git a/csharp/autobuilder/Semmle.Autobuild.Shared/BuildCommandRule.cs b/csharp/autobuilder/Semmle.Autobuild.Shared/BuildCommandRule.cs
index 79cdd8c01de4..0077bcca1a4b 100644
--- a/csharp/autobuilder/Semmle.Autobuild.Shared/BuildCommandRule.cs
+++ b/csharp/autobuilder/Semmle.Autobuild.Shared/BuildCommandRule.cs
@@ -8,9 +8,9 @@ namespace Semmle.Autobuild.Shared
     /// </summary>
     public class BuildCommandRule : IBuildRule
     {
-        private readonly Func<Autobuilder, Func<IDictionary<string, string>?, BuildScript>, BuildScript> withDotNet;
+        private readonly WithDotNet withDotNet;
 
-        public BuildCommandRule(Func<Autobuilder, Func<IDictionary<string, string>?, BuildScript>, BuildScript> withDotNet)
+        public BuildCommandRule(WithDotNet withDotNet)
         {
             this.withDotNet = withDotNet;
         }