diff --git a/examples/dalle_gpt4v_agent.py b/examples/dalle_gpt4v_agent.py
index 2b54b18a0..28215dba3 100644
--- a/examples/dalle_gpt4v_agent.py
+++ b/examples/dalle_gpt4v_agent.py
@@ -2,15 +2,7 @@
 # -*- coding: utf-8 -*-
 # @Desc   : use gpt4v to improve prompt and draw image with dall-e-3
 
-"""
-set the configuration in `config2.yaml` like below
-```
-llm:
-  base_url: "xxx"
-  api_key: "sk-xxx"
-  model: "gpt-4-vision-preview"
-```
-"""
+"""set `model: "gpt-4-vision-preview"` in `config2.yaml` first"""
 
 import asyncio
 
diff --git a/examples/llm_hello_world.py b/examples/llm_hello_world.py
index dfc2603aa..1d132eb8a 100644
--- a/examples/llm_hello_world.py
+++ b/examples/llm_hello_world.py
@@ -29,14 +29,11 @@ async def main():
     if hasattr(llm, "completion"):
         logger.info(llm.completion(hello_msg))
 
-    # check llm-vision capacity if it supports
+    # check if the configured llm supports llm-vision capacity. If not, it will throw a error
     invoice_path = Path(__file__).parent.joinpath("..", "tests", "data", "invoices", "invoice-2.png")
     img_base64 = encode_image(invoice_path)
-    try:
-        res = await llm.aask(msg="if this is a invoice, just return True else return False", images=[img_base64])
-        assert "true" in res.lower()
-    except Exception:
-        pass
+    res = await llm.aask(msg="if this is a invoice, just return True else return False", images=[img_base64])
+    assert "true" in res.lower()
 
 
 if __name__ == "__main__":
diff --git a/tests/metagpt/actions/test_action_node.py b/tests/metagpt/actions/test_action_node.py
index 18b4d0d0d..589282879 100644
--- a/tests/metagpt/actions/test_action_node.py
+++ b/tests/metagpt/actions/test_action_node.py
@@ -254,6 +254,7 @@ async def test_action_node_with_image():
     node = await invoice.fill(context="", llm=LLM(), images=[img_base64])
     assert node.instruct_content.invoice
 
+
 class ToolDef(BaseModel):
     tool_name: str = Field(default="a", description="tool name", examples=[])
     description: str = Field(default="b", description="tool description", examples=[])
diff --git a/tests/metagpt/environment/test_base_env.py b/tests/metagpt/environment/test_base_env.py
index 59c68fc9e..ce8165f2f 100644
--- a/tests/metagpt/environment/test_base_env.py
+++ b/tests/metagpt/environment/test_base_env.py
@@ -18,7 +18,7 @@ class ForTestEnv(Environment):
     value: int = 0
 
     @mark_as_readable
-    def read_api_no_parms(self):
+    def read_api_no_param(self):
         return self.value
 
     @mark_as_readable
@@ -46,5 +46,5 @@ async def test_ext_env():
     with pytest.raises(ValueError):
         await env.observe("not_exist_api")
 
-    assert await env.observe("read_api_no_parms") == 15
+    assert await env.observe("read_api_no_param") == 15
     assert await env.observe(EnvAPIAbstract(api_name="read_api", kwargs={"a": 5, "b": 5})) == 10