3 files changed, 24 insertions, 2 deletions
diff --git a/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs b/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs
index e750c659..fdbfdd8d 100644
--- a/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs
+++ b/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs
@@ -350,6 +350,16 @@ namespace StardewModdingAPI.Framework.ModLoading
                     mod.SetWarning(ModWarning.UsesDynamic);
                     break;
 
+                case InstructionHandleResult.DetectedFilesystemAccess:
+                    this.Monitor.LogOnce(loggedMessages, $"{logPrefix}Detected filesystem access ({handler.NounPhrase}) in assembly {filename}.");
+                    mod.SetWarning(ModWarning.AccessesFilesystem);
+                    break;
+
+                case InstructionHandleResult.DetectedShellAccess:
+                    this.Monitor.LogOnce(loggedMessages, $"{logPrefix}Detected shell or process access ({handler.NounPhrase}) in assembly {filename}.");
+                    mod.SetWarning(ModWarning.AccessesShell);
+                    break;
+
                 case InstructionHandleResult.None:
                     break;
 
diff --git a/src/SMAPI/Framework/ModLoading/InstructionHandleResult.cs b/src/SMAPI/Framework/ModLoading/InstructionHandleResult.cs
index cfa23d08..f3555c2d 100644
--- a/src/SMAPI/Framework/ModLoading/InstructionHandleResult.cs
+++ b/src/SMAPI/Framework/ModLoading/InstructionHandleResult.cs
@@ -24,6 +24,12 @@ namespace StardewModdingAPI.Framework.ModLoading
         DetectedDynamic,
 
         /// <summary>The instruction is compatible, but references <see cref="SpecialisedEvents.UnvalidatedUpdateTick"/> which may impact stability.</summary>
-        DetectedUnvalidatedUpdateTick
+        DetectedUnvalidatedUpdateTick,
+
+        /// <summary>The instruction accesses the filesystem directly.</summary>
+        DetectedFilesystemAccess,
+
+        /// <summary>The instruction accesses the OS shell or processes directly.</summary>
+        DetectedShellAccess
     }
 }
diff --git a/src/SMAPI/Framework/ModLoading/ModWarning.cs b/src/SMAPI/Framework/ModLoading/ModWarning.cs
index 0e4b2570..c62199b2 100644
--- a/src/SMAPI/Framework/ModLoading/ModWarning.cs
+++ b/src/SMAPI/Framework/ModLoading/ModWarning.cs
@@ -26,6 +26,12 @@ namespace StardewModdingAPI.Framework.ModLoading
         UsesUnvalidatedUpdateTick = 16,
 
         /// <summary>The mod has no update keys set.</summary>
-        NoUpdateKeys = 32
+        NoUpdateKeys = 32,
+
+        /// <summary>Uses .NET APIs for filesystem access.</summary>
+        AccessesFilesystem = 64,
+
+        /// <summary>Uses .NET APIs for shell or process access.</summary>
+        AccessesShell = 128
     }
 }