diff --git a/src/ZB.MOM.WW.ScadaBridge.InboundAPI/InboundScriptExecutor.cs b/src/ZB.MOM.WW.ScadaBridge.InboundAPI/InboundScriptExecutor.cs
index 49106409..f63292fb 100644
--- a/src/ZB.MOM.WW.ScadaBridge.InboundAPI/InboundScriptExecutor.cs
+++ b/src/ZB.MOM.WW.ScadaBridge.InboundAPI/InboundScriptExecutor.cs
@@ -10,6 +10,7 @@ using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Services;
 using ZB.MOM.WW.ScadaBridge.Commons.Messages.InboundApi;
 using ZB.MOM.WW.ScadaBridge.Commons.Observability;
 using ZB.MOM.WW.ScadaBridge.Commons.Types;
+using ZB.MOM.WW.ScadaBridge.ScriptAnalysis;
 
 namespace ZB.MOM.WW.ScadaBridge.InboundAPI;
 
@@ -220,6 +221,17 @@ public class InboundScriptExecutor
     /// Same defect, same shape as the Site-side one confirmed from a live dump on 2026-08-12
     /// (<c>SiteRuntime.Scripts.ScriptCompilationService.SharedScriptOptions</c>).
     /// </para>
+    ///
+    /// <para>
+    /// Static options alone are NOT enough: every method compile binds the
+    /// transitive closure of these references, and Roslyn's default resolver
+    /// re-resolves that closure through <c>MetadataReference.CreateFromFile</c> on
+    /// EVERY compile (confirmed live post-5a781c70 on 2026-08-12: 6 inbound
+    /// methods held 2,699 AssemblyMetadata/PEReader/MetadataImageReference
+    /// objects, ~150 per compile — and method revisions recompile, so growth was
+    /// unbounded). The shared <see cref="CachingScriptMetadataResolver"/>
+    /// memoizes those resolutions process-wide.
+    /// </para>
     /// </summary>
     private static readonly ScriptOptions SharedScriptOptions = ScriptOptions.Default
         .WithReferences(
@@ -229,6 +241,7 @@ public class InboundScriptExecutor
             typeof(RouteHelper).Assembly,
             typeof(ScriptParameters).Assembly,
             typeof(Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo).Assembly)
+        .WithMetadataResolver(CachingScriptMetadataResolver.Instance)
         .WithImports(
             "System",
             "System.Collections.Generic",