diff --git a/nanobot/config/schema.py b/nanobot/config/schema.py
index 0786080..76ec74d 100644
--- a/nanobot/config/schema.py
+++ b/nanobot/config/schema.py
@@ -27,9 +27,7 @@ class TelegramConfig(Base):
     enabled: bool = False
     token: str = ""  # Bot token from @BotFather
     allow_from: list[str] = Field(default_factory=list)  # Allowed user IDs or usernames
-    proxy: str | None = (
-        None  # HTTP/SOCKS5 proxy URL, e.g. "http://127.0.0.1:7890" or "socks5://127.0.0.1:1080"
-    )
+    proxy: str | None = None  # HTTP/SOCKS5 proxy URL, e.g. "http://127.0.0.1:7890" or "socks5://127.0.0.1:1080"
 
 
 class FeishuConfig(Base):
@@ -86,9 +84,7 @@ class EmailConfig(Base):
     from_address: str = ""
 
     # Behavior
-    auto_reply_enabled: bool = (
-        True  # If false, inbound email is read but no automatic reply is sent
-    )
+    auto_reply_enabled: bool = True  # If false, inbound email is read but no automatic reply is sent
     poll_interval_seconds: int = 30
     mark_seen: bool = True
     max_body_chars: int = 12000
@@ -163,9 +159,7 @@ class QQConfig(Base):
     enabled: bool = False
     app_id: str = ""  # 机器人 ID (AppID) from q.qq.com
     secret: str = ""  # 机器人密钥 (AppSecret) from q.qq.com
-    allow_from: list[str] = Field(
-        default_factory=list
-    )  # Allowed user openids (empty = public access)
+    allow_from: list[str] = Field(default_factory=list)  # Allowed user openids (empty = public access)
 
 
 class ChannelsConfig(Base):
@@ -285,9 +279,7 @@ class Config(BaseSettings):
         """Get expanded workspace path."""
         return Path(self.agents.defaults.workspace).expanduser()
 
-    def _match_provider(
-        self, model: str | None = None
-    ) -> tuple["ProviderConfig | None", str | None]:
+    def _match_provider(self, model: str | None = None) -> tuple["ProviderConfig | None", str | None]:
         """Match provider config and its registry name. Returns (config, spec_name)."""
         from nanobot.providers.registry import PROVIDERS