diff --git a/pytests/config_test/test_model_info_normalization.py b/pytests/config_test/test_model_info_normalization.py
new file mode 100644
index 00000000..72db7ea6
--- /dev/null
+++ b/pytests/config_test/test_model_info_normalization.py
@@ -0,0 +1,11 @@
+from src.config.model_configs import ModelInfo
+
+
+def test_model_identifier_strips_surrounding_whitespace() -> None:
+    model_info = ModelInfo(
+        api_provider="test-provider",
+        model_identifier=" glm-5.1 ",
+        name="test-model",
+    )
+
+    assert model_info.model_identifier == "glm-5.1"
diff --git a/pytests/test_openai_client_toolless_request.py b/pytests/test_openai_client_toolless_request.py
index eb6f6ae9..d99a691f 100644
--- a/pytests/test_openai_client_toolless_request.py
+++ b/pytests/test_openai_client_toolless_request.py
@@ -1,16 +1,59 @@
 from types import SimpleNamespace
 
+import pytest
+
 from src.config.model_configs import APIProvider, ReasoningParseMode, ToolArgumentParseMode
 from src.llm_models.model_client.openai_client import (
     _OpenAIStreamAccumulator,
     _build_reasoning_key,
     _default_normal_response_parser,
+    _parse_tool_arguments,
     _sanitize_messages_for_toolless_request,
 )
 from src.llm_models.payload_content.message import Message, RoleType, TextMessagePart
 from src.llm_models.payload_content.tool_option import ToolCall
 
 
+@pytest.mark.parametrize("parse_mode", list(ToolArgumentParseMode))
+def test_parse_tool_arguments_treats_blank_arguments_as_empty_dict(parse_mode: ToolArgumentParseMode) -> None:
+    assert _parse_tool_arguments("", parse_mode, None) == {}
+    assert _parse_tool_arguments("   ", parse_mode, None) == {}
+
+
+def test_normal_response_parser_accepts_empty_string_arguments_for_parameterless_tool() -> None:
+    response = SimpleNamespace(
+        choices=[
+            SimpleNamespace(
+                finish_reason="tool_calls",
+                message=SimpleNamespace(
+                    content=None,
+                    tool_calls=[
+                        SimpleNamespace(
+                            id="finish-call",
+                            type="function",
+                            function=SimpleNamespace(name="finish", arguments=""),
+                        )
+                    ],
+                ),
+            )
+        ],
+        usage=None,
+        model="glm-5.1",
+    )
+
+    api_response, usage_record = _default_normal_response_parser(
+        response,
+        reasoning_parse_mode=ReasoningParseMode.AUTO,
+        tool_argument_parse_mode=ToolArgumentParseMode.AUTO,
+        reasoning_key=None,
+    )
+
+    assert len(api_response.tool_calls) == 1
+    assert api_response.tool_calls[0].func_name == "finish"
+    assert api_response.tool_calls[0].args == {}
+    assert usage_record is None
+
+
 def test_sanitize_messages_for_toolless_request_drops_assistant_tool_call_without_parts() -> None:
     messages = [
         Message(
diff --git a/src/config/model_configs.py b/src/config/model_configs.py
index faecff1d..9ef05dbf 100644
--- a/src/config/model_configs.py
+++ b/src/config/model_configs.py
@@ -351,6 +351,7 @@ class ModelInfo(ConfigBase):
     Gemini 客户端会按自身支持的字段筛选并映射到 GenerateContentConfig、EmbedContentConfig 或音频请求配置中。"""
 
     def model_post_init(self, context: Any = None):
+        self.model_identifier = self.model_identifier.strip()
         if not self.model_identifier:
             raise ValueError(t("config.model_identifier_empty_generic"))
         if not self.name:
diff --git a/src/llm_models/model_client/openai_client.py b/src/llm_models/model_client/openai_client.py
index 02611907..db2313ef 100644
--- a/src/llm_models/model_client/openai_client.py
+++ b/src/llm_models/model_client/openai_client.py
@@ -585,6 +585,9 @@ def _parse_tool_arguments(
     Raises:
         RespParseException: 当参数无法解析为字典时抛出。
     """
+    if not raw_arguments.strip():
+        return {}
+
     try:
         if parse_mode == ToolArgumentParseMode.STRICT:
             arguments: Any = json.loads(raw_arguments)