diff --git a/packages/jupyter-ai-test/jupyter_ai_test/test_providers.py b/packages/jupyter-ai-test/jupyter_ai_test/test_providers.py
index b32b22acc..1ec042afb 100644
--- a/packages/jupyter-ai-test/jupyter_ai_test/test_providers.py
+++ b/packages/jupyter-ai-test/jupyter_ai_test/test_providers.py
@@ -76,6 +76,7 @@ class TestProviderWithStreaming(BaseProvider, TestLLMWithStreaming):
     """User inputs expected by this provider when initializing it. Each `Field` `f`
     should be passed in the constructor as a keyword argument, keyed by `f.key`."""
 
+
 class TestProviderAskLearnUnsupported(BaseProvider, TestLLMWithStreaming):
     id: ClassVar[str] = "test-provider-ask-learn-unsupported"
     """ID for this provider class."""
diff --git a/packages/jupyter-ai/jupyter_ai/chat_handlers/base.py b/packages/jupyter-ai/jupyter_ai/chat_handlers/base.py
index 71cf25646..83aaef4f0 100644
--- a/packages/jupyter-ai/jupyter_ai/chat_handlers/base.py
+++ b/packages/jupyter-ai/jupyter_ai/chat_handlers/base.py
@@ -111,7 +111,7 @@ class BaseChatHandler:
     """Format string template that is used to build the help message. Specified
     from traitlets configuration."""
 
-    chat_handlers: Dict[str, 'BaseChatHandler']
+    chat_handlers: Dict[str, "BaseChatHandler"]
     """Dictionary of chat handlers. Allows one chat handler to reference other
     chat handlers, which is necessary for some use-cases like printing the help
     message."""
@@ -127,7 +127,7 @@ def __init__(
         preferred_dir: Optional[str],
         dask_client_future: Awaitable[DaskClient],
         help_message_template: str,
-        chat_handlers: Dict[str, 'BaseChatHandler'],
+        chat_handlers: Dict[str, "BaseChatHandler"],
     ):
         self.log = log
         self.config_manager = config_manager
@@ -381,16 +381,18 @@ def output_dir(self) -> str:
             return self.preferred_dir
         else:
             return self.root_dir
-    
+
     def send_help_message(self, human_msg: Optional[HumanChatMessage] = None) -> None:
         """Sends a help message to all connected clients."""
         lm_provider = self.config_manager.lm_provider
-        unsupported_slash_commands = lm_provider.unsupported_slash_commands if lm_provider else set()
+        unsupported_slash_commands = (
+            lm_provider.unsupported_slash_commands if lm_provider else set()
+        )
         chat_handlers = self.chat_handlers
-        slash_commands = {k: v for k, v in chat_handlers.items() if k != "default" }
+        slash_commands = {k: v for k, v in chat_handlers.items() if k != "default"}
         for key in unsupported_slash_commands:
             del slash_commands[key]
-        
+
         # markdown string that lists the slash commands
         slash_commands_list = "\n".join(
             [
@@ -399,7 +401,9 @@ def send_help_message(self, human_msg: Optional[HumanChatMessage] = None) -> Non
             ]
         )
 
-        help_message_body = self.help_message_template.format(persona_name=self.persona.name, slash_commands_list=slash_commands_list)
+        help_message_body = self.help_message_template.format(
+            persona_name=self.persona.name, slash_commands_list=slash_commands_list
+        )
         help_message = AgentChatMessage(
             id=uuid4().hex,
             time=time.time(),
diff --git a/packages/jupyter-ai/jupyter_ai/chat_handlers/clear.py b/packages/jupyter-ai/jupyter_ai/chat_handlers/clear.py
index df88a7db1..2d4252256 100644
--- a/packages/jupyter-ai/jupyter_ai/chat_handlers/clear.py
+++ b/packages/jupyter-ai/jupyter_ai/chat_handlers/clear.py
@@ -27,4 +27,4 @@ async def process_message(self, _):
             break
 
         # re-send help message
-        self.send_help_message()
\ No newline at end of file
+        self.send_help_message()
diff --git a/packages/jupyter-ai/jupyter_ai/chat_handlers/help.py b/packages/jupyter-ai/jupyter_ai/chat_handlers/help.py
index 718ea2e63..cd8556863 100644
--- a/packages/jupyter-ai/jupyter_ai/chat_handlers/help.py
+++ b/packages/jupyter-ai/jupyter_ai/chat_handlers/help.py
@@ -2,6 +2,7 @@
 
 from .base import BaseChatHandler, SlashCommandRoutingType
 
+
 class HelpChatHandler(BaseChatHandler):
     id = "help"
     name = "Help"
@@ -15,4 +16,4 @@ def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
     async def process_message(self, message: HumanChatMessage):
-        self.send_help_message(message)
\ No newline at end of file
+        self.send_help_message(message)
diff --git a/packages/jupyter-ai/jupyter_ai/extension.py b/packages/jupyter-ai/jupyter_ai/extension.py
index f80ae766d..e89f6bdb4 100644
--- a/packages/jupyter-ai/jupyter_ai/extension.py
+++ b/packages/jupyter-ai/jupyter_ai/extension.py
@@ -178,9 +178,9 @@ class AiExtension(ExtensionApp):
         'Jupyternaut'.
 
         - `slash_commands_list`: A string containing a bulleted list of the
-        slash commands available to the configured language model. 
+        slash commands available to the configured language model.
         """,
-        config=True
+        config=True,
     )
 
     def initialize_settings(self):
@@ -369,9 +369,10 @@ def _show_help_message(self):
         # call `send_help_message()` on any instance of `BaseChatHandler`. The
         # `default` chat handler should always exist, so we reference that
         # object when calling `send_help_message()`.
-        default_chat_handler: DefaultChatHandler = self.settings["jai_chat_handlers"]["default"]
+        default_chat_handler: DefaultChatHandler = self.settings["jai_chat_handlers"][
+            "default"
+        ]
         default_chat_handler.send_help_message()
-        
 
     async def _get_dask_client(self):
         return DaskClient(processes=False, asynchronous=True)