feat(tool system): add all methods for obtaining the tool

api/app/core/tools/builtin/datetime_tool.py

@@ -27,7 +27,7 @@ class DateTimeTool(BuiltinTool):
                 type=ParameterType.STRING,
                 description="操作类型",
                 required=True,
-                enum=["format", "convert_timezone", "timestamp_to_datetime", "datetime_to_timestamp", "calculate", "now"]
+                enum=["format", "convert_timezone", "timestamp_to_datetime", "now"]
             ),
             ToolParameter(
                 name="input_value",

api/app/core/tools/builtin/json_tool.py

@@ -29,8 +29,7 @@ class JsonTool(BuiltinTool):
                 type=ParameterType.STRING,
                 description="操作类型",
                 required=True,
-                enum=["format", "minify", "validate", "convert", "to_yaml", "from_yaml", "to_xml", "from_xml", "merge",
-                      "extract", "insert", "replace", "delete", "parse"]
+                enum=["insert", "replace", "delete", "parse"]
             ),
             ToolParameter(
                 name="input_data",

api/app/core/tools/mcp/client.py

@@ -204,7 +204,7 @@ class MCPClient:
             )
             
             init_response = json.loads(response)
-            if "error" in init_response:
+            if init_response.get("error", None) is not None:
                 raise MCPProtocolError(f"初始化失败: {init_response['error']}")
             
             return True
@@ -325,7 +325,7 @@ class MCPClient:
         try:
             response = await self._send_request(request_data, timeout)
             
-            if "error" in response:
+            if response.get("error", None) is not None:
                 error = response["error"]
                 raise MCPProtocolError(f"工具调用失败: {error.get('message', '未知错误')}")