🐛 Bug: 1. Fix the bug where the max_tokens is missing in the Claude request body

2. Fix the bug where claude tool_choice does not support "tool_choice": {"type": "function", "function": {"name": "extract_underlined_text"}}

request.py

@@ -447,14 +447,11 @@ async def get_vertex_claude_payload(request, engine, provider):
         "anthropic_version": "vertex-2023-10-16",
         "messages": messages,
         "system": system_prompt or "You are Claude, a large language model trained by Anthropic.",
+        "max_tokens": 8192 if "claude-3-5-sonnet" in model else 4096,
     }
 
-    # 檢查是否需要添加 max_tokens
-    if 'max_tokens' not in payload:
-        if "claude-3-5-sonnet" in model:
-            payload['max_tokens'] = 8192
-        elif "claude-3" in model:  # 處理其他 Claude 3 模型
-            payload['max_tokens'] = 4096
+    if request.max_tokens:
+        payload["max_tokens"] = int(request.max_tokens)
 
     miss_fields = [
         'model',
@@ -477,9 +474,15 @@ async def get_vertex_claude_payload(request, engine, provider):
             tools.append(json_tool)
         payload["tools"] = tools
         if "tool_choice" in payload:
-            payload["tool_choice"] = {
-                "type": "auto"
-            }
+            if payload["tool_choice"]["type"] == "auto":
+                payload["tool_choice"] = {
+                    "type": "auto"
+                }
+            if payload["tool_choice"]["type"] == "function":
+                payload["tool_choice"] = {
+                    "type": "tool",
+                    "name": payload["tool_choice"]["function"]["name"]
+                }
 
     if provider.get("tools") == False:
         payload.pop("tools", None)
@@ -711,8 +714,12 @@ async def get_claude_payload(request, engine, provider):
         "model": model,
         "messages": messages,
         "system": system_prompt or "You are Claude, a large language model trained by Anthropic.",
+        "max_tokens": 8192 if "claude-3-5-sonnet" in model else 4096,
     }
 
+    if request.max_tokens:
+        payload["max_tokens"] = int(request.max_tokens)
+
     miss_fields = [
         'model',
         'messages',
@@ -735,9 +742,15 @@ async def get_claude_payload(request, engine, provider):
             tools.append(json_tool)
         payload["tools"] = tools
         if "tool_choice" in payload:
-            payload["tool_choice"] = {
-                "type": "auto"
-            }
+            if payload["tool_choice"]["type"] == "auto":
+                payload["tool_choice"] = {
+                    "type": "auto"
+                }
+            if payload["tool_choice"]["type"] == "function":
+                payload["tool_choice"] = {
+                    "type": "tool",
+                    "name": payload["tool_choice"]["function"]["name"]
+                }
 
     if provider.get("tools") == False:
         payload.pop("tools", None)