Add comprehensive documentation and type hints to FileReadTool

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai_tools/tools/file_read_tool/file_read_tool.py

@@ -11,22 +11,49 @@ class FileReadToolSchema(BaseModel):
 
 
 class FileReadTool(BaseTool):
+    """A tool for reading file contents.
+
+    This tool inherits its schema handling from BaseTool to avoid recursive schema
+    definition issues. The args_schema is set to FileReadToolSchema which defines
+    the required file_path parameter. The schema should not be overridden in the
+    constructor as it would break the inheritance chain and cause infinite loops.
+
+    The tool supports two ways of specifying the file path:
+    1. At construction time via the file_path parameter
+    2. At runtime via the file_path parameter in the tool's input
+
+    Args:
+        file_path (Optional[str]): Path to the file to be read. If provided,
+            this becomes the default file path for the tool.
+        **kwargs: Additional keyword arguments passed to BaseTool.
+
+    Example:
+        >>> tool = FileReadTool(file_path="/path/to/file.txt")
+        >>> content = tool.run()  # Reads /path/to/file.txt
+        >>> content = tool.run(file_path="/path/to/other.txt")  # Reads other.txt
+    """
     name: str = "Read a file's content"
-    description: str = "A tool that can be used to read a file's content."
+    description: str = "A tool that reads the content of a file. To use this tool, provide a 'file_path' parameter with the path to the file you want to read."
     args_schema: Type[BaseModel] = FileReadToolSchema
     file_path: Optional[str] = None
 
-    def __init__(self, file_path: Optional[str] = None, **kwargs):
+    def __init__(self, file_path: Optional[str] = None, **kwargs: Any) -> None:
+        """Initialize the FileReadTool.
+
+        Args:
+            file_path (Optional[str]): Path to the file to be read. If provided,
+                this becomes the default file path for the tool.
+            **kwargs: Additional keyword arguments passed to BaseTool.
+        """
         super().__init__(**kwargs)
         if file_path is not None:
             self.file_path = file_path
-            self.description = f"A tool that can be used to read {file_path}'s content."
-            self._generate_description()
+            self.description = f"A tool that reads file content. The default file is {file_path}, but you can provide a different 'file_path' parameter to read another file."
 
     def _run(
         self,
         **kwargs: Any,
-    ) -> Any:
+    ) -> str:
         file_path = kwargs.get("file_path", self.file_path)
         if file_path is None:
             return "Error: No file path provided. Please provide a file path either in the constructor or as an argument."
@@ -40,3 +67,15 @@ class FileReadTool(BaseTool):
             return f"Error: Permission denied when trying to read file: {file_path}"
         except Exception as e:
             return f"Error: Failed to read file {file_path}. {str(e)}"
+
+    def _generate_description(self) -> None:
+        """Generate the tool description based on file path.
+
+        This method updates the tool's description to include information about
+        the default file path while maintaining the ability to specify a different
+        file at runtime.
+
+        Returns:
+            None
+        """
+        self.description = f"A tool that can be used to read {self.file_path}'s content."