diff --git a/metagpt/actions/action_node.py b/metagpt/actions/action_node.py
index fb7d621d8..9bb12fc84 100644
--- a/metagpt/actions/action_node.py
+++ b/metagpt/actions/action_node.py
@@ -52,6 +52,7 @@ def dict_to_markdown(d, prefix="-", postfix="\n"):
 
 class ActionNode:
     """ActionNode is a tree of nodes."""
+
     mode: str
 
     # Action Context
@@ -70,8 +71,15 @@ class ActionNode:
     content: str
     instruct_content: BaseModel
 
-    def __init__(self, key: str, expected_type: Type, instruction: str, example: str, content: str = "",
-                 children: dict[str, "ActionNode"] = None):
+    def __init__(
+        self,
+        key: str,
+        expected_type: Type,
+        instruction: str,
+        example: str,
+        content: str = "",
+        children: dict[str, "ActionNode"] = None,
+    ):
         self.key = key
         self.expected_type = expected_type
         self.instruction = instruction
diff --git a/metagpt/actions/project_management_an.py b/metagpt/actions/project_management_an.py
index 970cb0594..6208c1051 100644
--- a/metagpt/actions/project_management_an.py
+++ b/metagpt/actions/project_management_an.py
@@ -44,7 +44,7 @@ FULL_API_SPEC = ActionNode(
     key="Full API spec",
     expected_type=str,
     instruction="Describe all APIs using OpenAPI 3.0 spec that may be used by both frontend and backend. If front-end "
-                "and back-end communication is not required, leave it blank.",
+    "and back-end communication is not required, leave it blank.",
     example="openapi: 3.0.0 ...",
 )
 
diff --git a/metagpt/roles/project_manager.py b/metagpt/roles/project_manager.py
index f98d28cb7..42564cd70 100644
--- a/metagpt/roles/project_manager.py
+++ b/metagpt/roles/project_manager.py
@@ -30,5 +30,6 @@ class ProjectManager(Role):
 
     def __init__(self, **kwargs) -> None:
         super().__init__(**kwargs)
+
         self._init_actions([WriteTasks])
         self._watch([WriteDesign])