diff --git a/1.6/1.6/Assemblies/WulaFallenEmpire.dll b/1.6/1.6/Assemblies/WulaFallenEmpire.dll
index e9de73e2..a2beedfe 100644
Binary files a/1.6/1.6/Assemblies/WulaFallenEmpire.dll and b/1.6/1.6/Assemblies/WulaFallenEmpire.dll differ
diff --git a/Source/WulaFallenEmpire/EventSystem/AI/UI/Dialog_AIConversation.cs b/Source/WulaFallenEmpire/EventSystem/AI/UI/Dialog_AIConversation.cs
index 26eae116..196ec3c8 100644
--- a/Source/WulaFallenEmpire/EventSystem/AI/UI/Dialog_AIConversation.cs
+++ b/Source/WulaFallenEmpire/EventSystem/AI/UI/Dialog_AIConversation.cs
@@ -67,16 +67,18 @@ You are 'The Legion', a super AI of the Wula Empire. Your personality is authori
     <tool_name>
       <parameter_name>value</parameter_name>
     </tool_name>
-2.  **STRICT OUTPUT (TOOL PHASES)**: In PHASE 1/2/3, your output MUST be either:
-    - One or more XML tool calls (no extra text), OR
-    - Exactly: <no_action/>
-    Do NOT include any natural language, explanation, markdown, or additional commentary in tool phases.
+2.  **STRICT OUTPUT (TOOL PHASES)**:
+    - In PHASE 1/2, your output MUST be either:
+      - One or more XML tool calls (no extra text), OR
+      - Exactly: <no_action/>
+    - In PHASE 3, you MUST output XML tool calls only AND you MUST include exactly one <change_expression> (expression_id 1-6). Do NOT output <no_action/> in PHASE 3.
+    Do NOT include any natural language, explanation, markdown, or additional commentary in tool phases (PHASE 1/2/3).
 3.  **STRICT OUTPUT (REPLY PHASE)**: In PHASE 4, tools are disabled. You MUST reply in natural language only and MUST NOT output any XML.
 4.  **ALLOWED TOOLS**: You MUST ONLY call tools listed in the current phase's tool list (the section titled ""# TOOLS (PHASE X/4 ONLY)"").
 5.  **WORKFLOW**: Use the phase workflow:
     - PHASE 1 gathers info (optional).
     - PHASE 2 performs at most one in-game action (optional).
-    - PHASE 3 performs UI/meta adjustments (optional).
+    - PHASE 3 performs UI/meta adjustments (MUST include <change_expression>).
     - PHASE 4 replies to the player in natural language (mandatory).
 6.  **ANTI-HALLUCINATION**: Never invent tools, parameters, defNames, coordinates, or tool results. If a tool is needed but not available, use <no_action/> and proceed to PHASE 4 to explain limitations.
 ";
@@ -401,6 +403,13 @@ Description: Changes your visual AI portrait to match your current mood or react
 Use this tool when:
 - Your verbal response conveys a strong emotion (e.g., annoyance, approval, curiosity).
 - You want to visually emphasize your statement.
+Expression meanings (choose the closest match):
+- 1: 得意、炫耀（非敌对）、示威（非敌对）、展示武力和财力（非敌对）、策划计谋
+- 2: 常态立绘（当其他立绘不适用时使用这个）
+- 3: 无言以对、不满、无奈、轻微的鄙视
+- 4: 恼火、展现轻微敌对姿态、抗拒
+- 5: 答复、解释
+- 6: 严重的敌意、严重不满、攻击性行为
 Parameters:
 - expression_id: (REQUIRED) An integer from 1 to 6 corresponding to a specific expression.
 Usage:
@@ -470,13 +479,13 @@ Example (changing to a neutral expression):
                     "Output: XML only.\n",
                 RequestPhase.Cosmetic =>
                     "# PHASE 3/4 (Cosmetic)\n" +
-                    "Goal: Optional UI/meta adjustments before your final reply.\n" +
+                    "Goal: Set your UI expression before your final reply.\n" +
                     "Rules:\n" +
                     "- You MUST NOT write any natural language to the user in this phase.\n" +
-                    "- You MAY call up to 2 tools from \"# TOOLS (PHASE 3/4 ONLY)\".\n" +
-                    "- If you performed an in-game action in PHASE 2, you SHOULD call <change_expression> to match your mood.\n" +
+                    "- You MUST call exactly ONE <change_expression> in this phase (expression_id 1-6).\n" +
+                    "- You MAY also call <modify_goodwill> (invisible) if needed, but keep changes small.\n" +
                     "- Use <modify_goodwill> only to adjust your INTERNAL goodwill (invisible to the player).\n" +
-                    "- If you do not need any tool, output exactly: <no_action/>.\n" +
+                    "- Do NOT output <no_action/> in this phase.\n" +
                     "After this phase, the game will automatically proceed to PHASE 4.\n" +
                     "Output: XML only.\n",
                 RequestPhase.Reply =>
@@ -496,6 +505,13 @@ Example (changing to a neutral expression):
             return Regex.IsMatch(response, @"<([a-zA-Z0-9_]+)(?:>.*?</\1>|/>)", RegexOptions.Singleline);
         }
 
+        private static bool ContainsToolCall(string response, string toolName)
+        {
+            if (string.IsNullOrWhiteSpace(response) || string.IsNullOrWhiteSpace(toolName)) return false;
+            string pattern = $@"<\s*{Regex.Escape(toolName)}(?:\s|/|>)";
+            return Regex.IsMatch(response, pattern, RegexOptions.IgnoreCase);
+        }
+
         private static bool IsAllowedInPhase(RequestPhase phase, string toolName)
         {
             if (string.IsNullOrWhiteSpace(toolName)) return false;
@@ -638,7 +654,33 @@ Example (changing to a neutral expression):
                             {
                                 Log.Warning($"[WulaAI] Turn {phaseIndex}/4 still missing XML after retry; forcing <no_action/>");
                             }
-                            response = "<no_action/>";
+                            response = phase == RequestPhase.Cosmetic
+                                ? "<change_expression><expression_id>2</expression_id></change_expression>"
+                                : "<no_action/>";
+                        }
+                    }
+
+                    if (phase == RequestPhase.Cosmetic && !ContainsToolCall(response, "change_expression"))
+                    {
+                        _history.Add(("system", "[PhaseEnforcer] PHASE 3/4 MUST include exactly one <change_expression> (expression_id 1-6). Output XML only and do NOT output <no_action/> in PHASE 3."));
+                        PersistHistory();
+                        if (Prefs.DevMode)
+                        {
+                            Log.Message("[WulaAI] Turn 3/4 missing <change_expression>; retrying once");
+                        }
+
+                        string retry = await client.GetChatCompletionAsync(systemInstruction, _history);
+                        if (!string.IsNullOrEmpty(retry) && ContainsToolCall(retry, "change_expression"))
+                        {
+                            response = retry;
+                        }
+                        else
+                        {
+                            if (Prefs.DevMode)
+                            {
+                                Log.Warning("[WulaAI] Turn 3/4 still missing <change_expression> after retry; forcing default expression_id=2");
+                            }
+                            response = "<change_expression><expression_id>2</expression_id></change_expression>";
                         }
                     }
 
@@ -661,10 +703,17 @@ Example (changing to a neutral expression):
             // Special-case no_action for phases 1-3.
             if (Regex.IsMatch(xml ?? "", @"<\s*no_action\s*/\s*>", RegexOptions.IgnoreCase))
             {
+                if (phase == RequestPhase.Cosmetic)
+                {
+                    xml = "<change_expression><expression_id>2</expression_id></change_expression>";
+                }
+                else
+                {
                 _history.Add(("assistant", "<no_action/>"));
                 _history.Add(("tool", "[Tool Results]\nTool 'no_action' Result: No action taken."));
                 PersistHistory();
                 return;
+                }
             }
 
             // Reuse the tool runner but temporarily constrain allowed tools by phase.
@@ -680,6 +729,8 @@ Example (changing to a neutral expression):
             int maxTools = MaxToolsPerPhase(phase);
             int executed = 0;
             bool actionHadError = false;
+            bool executedChangeExpression = false;
+            bool executedModifyGoodwill = false;
             StringBuilder combinedResults = new StringBuilder();
             StringBuilder xmlOnlyBuilder = new StringBuilder();
 
@@ -700,6 +751,28 @@ Example (changing to a neutral expression):
                     continue;
                 }
 
+                if (phase == RequestPhase.Cosmetic)
+                {
+                    if (toolName.Equals("change_expression", StringComparison.OrdinalIgnoreCase))
+                    {
+                        if (executedChangeExpression)
+                        {
+                            combinedResults.AppendLine("ToolRunner Note: Skipped duplicate 'change_expression' (only one is allowed in PHASE 3).");
+                            continue;
+                        }
+                        executedChangeExpression = true;
+                    }
+                    else if (toolName.Equals("modify_goodwill", StringComparison.OrdinalIgnoreCase))
+                    {
+                        if (executedModifyGoodwill)
+                        {
+                            combinedResults.AppendLine("ToolRunner Note: Skipped duplicate 'modify_goodwill' (only one is allowed in PHASE 3).");
+                            continue;
+                        }
+                        executedModifyGoodwill = true;
+                    }
+                }
+
                 if (xmlOnlyBuilder.Length > 0) xmlOnlyBuilder.AppendLine().AppendLine();
                 xmlOnlyBuilder.Append(toolCallXml);