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Source/WulaFallenEmpire/EventSystem/AI/Tools/Tool_ChangeExpression.cs

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+using System;
+using Verse;
+using WulaFallenEmpire.EventSystem.AI.UI;
+
+namespace WulaFallenEmpire.EventSystem.AI.Tools
+{
+    public class Tool_ChangeExpression : AITool
+    {
+        public override string Name => "change_expression";
+        public override string Description => "Changes your visual expression/portrait to match your current mood or reaction.";
+        public override string UsageSchema => "{\"expression_id\": \"int (1-6)\"}";
+
+        public override string Execute(string args)
+        {
+            try
+            {
+                var json = SimpleJsonParser.Parse(args);
+                int id = 0;
+                if (json.TryGetValue("expression_id", out string idStr) && int.TryParse(idStr, out id))
+                {
+                    var window = Find.WindowStack.WindowOfType<Dialog_AIConversation>();
+                    if (window != null)
+                    {
+                        window.SetPortrait(id);
+                        return $"Expression changed to {id}.";
+                    }
+                    return "Error: Dialog window not found.";
+                }
+                return "Error: Invalid arguments. 'expression_id' must be an integer.";
+            }
+            catch (Exception ex)
+            {
+                return $"Error executing tool: {ex.Message}";
+            }
+        }
+    }
+}