Fixed enterprise configuration plugins losing to local plugins with the same ID

app/MindWork AI Studio/Tools/PluginSystem/PluginFactory.Loading.cs

@@ -110,10 +110,26 @@ public static partial class PluginFactory
             
                     LOG.LogInformation($"Successfully loaded plugin: '{pluginMainFile}' (Id='{plugin.Id}', Type='{plugin.Type}', Name='{plugin.Name}', Version='{plugin.Version}', Authors='{string.Join(", ", plugin.Authors)}')");
 
-                    var isConfigurationPluginInConfigDirectory =
-                        plugin.Type is PluginType.CONFIGURATION &&
-                        pluginPath.StartsWith(CONFIGURATION_PLUGINS_ROOT, StringComparison.OrdinalIgnoreCase);
+                    //
+                    // Plugin IDs must be unique: many lookups resolve a plugin by its ID alone, e.g.
+                    // the base language plugin in PluginFactory.Starting or the owner of a locked
+                    // setting. When two plugins share an ID, the one deployed by the organization's
+                    // IT wins. Otherwise, a manually placed copy could outrank the enterprise
+                    // configuration, which is the exact opposite of what an organization expects:
+                    //
+                    if (AVAILABLE_PLUGINS.FirstOrDefault(candidate => candidate.Id == plugin.Id) is { } duplicatePlugin)
+                    {
+                        if (!IsEnterpriseConfigurationPath(pluginPath) || IsEnterpriseConfigurationPath(duplicatePlugin.LocalPath))
+                        {
+                            LOG.LogWarning($"Ignoring the plugin '{pluginMainFile}': its ID ('{plugin.Id}') is already used by the plugin at '{duplicatePlugin.LocalPath}'. Plugin IDs must be unique. Please remove one of these plugins.");
+                            continue;
+                        }
 
+                        LOG.LogWarning($"Ignoring the plugin at '{duplicatePlugin.LocalPath}': it uses the ID ('{plugin.Id}') of the enterprise configuration plugin at '{pluginPath}'. Plugins deployed by your organization's IT take precedence.");
+                        AVAILABLE_PLUGINS.Remove(duplicatePlugin);
+                    }
+
+                    var isConfigurationPluginInConfigDirectory = plugin.Type is PluginType.CONFIGURATION && IsEnterpriseConfigurationPath(pluginPath);
                     var isManagedByConfigServer = false;
                     Guid? managedConfigurationId = null;
                     if (plugin is PluginConfiguration configPlugin)

app/MindWork AI Studio/Tools/PluginSystem/PluginFactory.cs

@@ -76,6 +76,35 @@ public static partial class PluginFactory
         return true;
     }
 
+    /// <summary>
+    /// Checks whether a plugin directory belongs to the enterprise configuration area.
+    /// </summary>
+    /// <remarks>
+    /// Only the IT department of an organization deploys plugins there: the config server downloads
+    /// them into a directory named after their configuration ID. We decide by path on purpose. The
+    /// Lua field DEPLOYED_USING_CONFIG_SERVER is self-declared, so any plugin could claim to be
+    /// deployed by an organization.
+    /// </remarks>
+    /// <param name="pluginPath">The directory of the plugin.</param>
+    /// <returns>True when the directory is nested in the enterprise configuration directory.</returns>
+    private static bool IsEnterpriseConfigurationPath(string? pluginPath)
+    {
+        if (string.IsNullOrWhiteSpace(pluginPath) || string.IsNullOrWhiteSpace(CONFIGURATION_PLUGINS_ROOT))
+            return false;
+
+        try
+        {
+            var configurationRoot = Path.GetFullPath(CONFIGURATION_PLUGINS_ROOT).TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar) + Path.DirectorySeparatorChar;
+            var pluginDirectory = Path.GetFullPath(pluginPath).TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar) + Path.DirectorySeparatorChar;
+            return pluginDirectory.StartsWith(configurationRoot, StringComparison.OrdinalIgnoreCase);
+        }
+        catch (Exception e)
+        {
+            LOG.LogWarning(e, $"Was not able to check whether the plugin directory '{pluginPath}' belongs to the enterprise configuration directory. Treating it as a local plugin.");
+            return false;
+        }
+    }
+
     private static async Task LockHotReloadAsync()
     {
         if (!IsInitialized)

app/MindWork AI Studio/wwwroot/changelog/v26.8.1.md

@@ -12,4 +12,5 @@
 - Fixed configuration-managed settings remaining active after their configuration plugin was removed.
 - Fixed the integrated code editor to keep errors and other issues in plugin code visible in the footer while scrolling.
 - Fixed the trusted badge so you can now see at a glance which models are trusted. It is shown consistently for self-hosted models and models from trusted providers.
+- Fixed which plugin wins when two plugins claim the same plugin ID. Previously, it was down to chance, so a manually placed copy could take over from a configuration your IT department deployed. Configurations from your organization now always win, and the ignored plugin is reported in the log.
 - Upgraded dependencies to their latest versions to improve security and stability.