3 files changed, 47 insertions, 11 deletions
diff --git a/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs b/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs
index 6c0e1c14..2fb2aba7 100644
--- a/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs
+++ b/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs
@@ -285,33 +285,27 @@ namespace StardewModdingAPI.Framework.ModLoading
                     this.Monitor.LogOnce(loggedMessages, $"{logPrefix}Broken code in {filename}: {handler.NounPhrase}.");
                     if (!assumeCompatible)
                         throw new IncompatibleInstructionException(handler.NounPhrase, $"Found an incompatible CIL instruction ({handler.NounPhrase}) while loading assembly {filename}.");
-                    this.Monitor.LogOnce(loggedMessages, $"{logPrefix}Found broken code ({handler.NounPhrase}) while loading assembly {filename}, but SMAPI is configured to allow it anyway. The mod may crash or behave unexpectedly.", LogLevel.Warn);
+                    mod.SetWarning(ModWarning.BrokenCodeLoaded);
                     break;
 
                 case InstructionHandleResult.DetectedGamePatch:
                     this.Monitor.LogOnce(loggedMessages, $"{logPrefix}Detected game patcher ({handler.NounPhrase}) in assembly {filename}.");
-                    this.Monitor.LogOnce(loggedMessages, $"{logPrefix}{mod.DisplayName} patches the game, which may impact game stability. If you encounter problems, try removing this mod first.", LogLevel.Warn);
+                    mod.SetWarning(ModWarning.PatchesGame);
                     break;
 
                 case InstructionHandleResult.DetectedSaveSerialiser:
                     this.Monitor.LogOnce(loggedMessages, $"{logPrefix}Detected possible save serialiser change ({handler.NounPhrase}) in assembly {filename}.");
-                    this.Monitor.LogOnce(loggedMessages, $"{logPrefix}{mod.DisplayName} seems to change the save serialiser. It may change your saves in such a way that they won't work without this mod in the future.", LogLevel.Warn);
+                    mod.SetWarning(ModWarning.ChangesSaveSerialiser);
                     break;
 
                 case InstructionHandleResult.DetectedUnvalidatedUpdateTick:
                     this.Monitor.LogOnce(loggedMessages, $"{logPrefix}Detected reference to {handler.NounPhrase} in assembly {filename}.");
-                    this.Monitor.LogOnce(loggedMessages, $"{logPrefix}{mod.DisplayName} uses a specialised SMAPI event that may crash the game or corrupt your save file. If you encounter problems, try removing this mod first.", LogLevel.Warn);
+                    mod.SetWarning(ModWarning.UsesUnvalidatedUpdateTick);
                     break;
 
                 case InstructionHandleResult.DetectedDynamic:
                     this.Monitor.LogOnce(loggedMessages, $"{logPrefix}Detected 'dynamic' keyword ({handler.NounPhrase}) in assembly {filename}.");
-                    this.Monitor.LogOnce(loggedMessages, $"{logPrefix}{mod.DisplayName} uses the 'dynamic' keyword, which isn't compatible with Stardew Valley on Linux or Mac.",
-#if SMAPI_FOR_WINDOWS
-                        this.IsDeveloperMode ? LogLevel.Warn : LogLevel.Debug
-#else
-                        LogLevel.Warn
-#endif
-                    );
+                    mod.SetWarning(ModWarning.UsesDynamic);
                     break;
 
                 case InstructionHandleResult.None:
diff --git a/src/SMAPI/Framework/ModLoading/ModMetadata.cs b/src/SMAPI/Framework/ModLoading/ModMetadata.cs
index d3a33e7a..e4ec7e3b 100644
--- a/src/SMAPI/Framework/ModLoading/ModMetadata.cs
+++ b/src/SMAPI/Framework/ModLoading/ModMetadata.cs
@@ -25,6 +25,9 @@ namespace StardewModdingAPI.Framework.ModLoading
         /// <summary>The metadata resolution status.</summary>
         public ModMetadataStatus Status { get; private set; }
 
+        /// <summary>Indicates non-error issues with the mod.</summary>
+        public ModWarning Warnings { get; private set; }
+
         /// <summary>The reason the metadata is invalid, if any.</summary>
         public string Error { get; private set; }
 
@@ -71,6 +74,14 @@ namespace StardewModdingAPI.Framework.ModLoading
             return this;
         }
 
+        /// <summary>Set a warning flag for the mod.</summary>
+        /// <param name="warning">The warning to set.</param>
+        public IModMetadata SetWarning(ModWarning warning)
+        {
+            this.Warnings |= warning;
+            return this;
+        }
+
         /// <summary>Set the mod instance.</summary>
         /// <param name="mod">The mod instance to set.</param>
         public IModMetadata SetMod(IMod mod)
diff --git a/src/SMAPI/Framework/ModLoading/ModWarning.cs b/src/SMAPI/Framework/ModLoading/ModWarning.cs
new file mode 100644
index 00000000..0e4b2570
--- /dev/null
+++ b/src/SMAPI/Framework/ModLoading/ModWarning.cs
@@ -0,0 +1,31 @@
+using System;
+using StardewModdingAPI.Events;
+
+namespace StardewModdingAPI.Framework.ModLoading
+{
+    /// <summary>Indicates a detected non-error mod issue.</summary>
+    [Flags]
+    internal enum ModWarning
+    {
+        /// <summary>No issues detected.</summary>
+        None = 0,
+
+        /// <summary>SMAPI detected incompatible code in the mod, but was configured to load it anyway.</summary>
+        BrokenCodeLoaded = 1,
+
+        /// <summary>The mod affects the save serializer in a way that may make saves unloadable without the mod.</summary>
+        ChangesSaveSerialiser = 2,
+
+        /// <summary>The mod patches the game in a way that may impact stability.</summary>
+        PatchesGame = 4,
+
+        /// <summary>The mod uses the <c>dynamic</c> keyword which won't work on Linux/Mac.</summary>
+        UsesDynamic = 8,
+
+        /// <summary>The mod references <see cref="SpecialisedEvents.UnvalidatedUpdateTick"/> which may impact stability.</summary>
+        UsesUnvalidatedUpdateTick = 16,
+
+        /// <summary>The mod has no update keys set.</summary>
+        NoUpdateKeys = 32
+    }
+}