diff --git a/src/kimi_cli/exception.py b/src/kimi_cli/exception.py
index d8c21c75e..72ef586b6 100644
--- a/src/kimi_cli/exception.py
+++ b/src/kimi_cli/exception.py
@@ -1,43 +1,39 @@
 from __future__ import annotations
 
+__all__ = (
+    "KimiCLIException",
+    "ConfigError",
+    "AgentSpecError",
+    "InvalidToolError",
+    "SystemPromptTemplateError",
+    "MCPConfigError",
+    "MCPRuntimeError",
+)
+
 
 class KimiCLIException(Exception):
     """Base exception class for Kimi Code CLI."""
 
-    pass
-
 
 class ConfigError(KimiCLIException, ValueError):
     """Configuration error."""
 
-    pass
-
 
 class AgentSpecError(KimiCLIException, ValueError):
     """Agent specification error."""
 
-    pass
-
 
 class InvalidToolError(KimiCLIException, ValueError):
     """Invalid tool error."""
 
-    pass
-
 
 class SystemPromptTemplateError(KimiCLIException, ValueError):
     """System prompt template error."""
 
-    pass
-
 
 class MCPConfigError(KimiCLIException, ValueError):
     """MCP config error."""
 
-    pass
-
 
 class MCPRuntimeError(KimiCLIException, RuntimeError):
     """MCP runtime error."""
-
-    pass