refactor: move inline imports to module level (#1893)

src/mcp/client/__main__.py

@@ -1,6 +1,7 @@
 import argparse
 import logging
 import sys
+import warnings
 from functools import partial
 from urllib.parse import urlparse
 
@@ -15,8 +16,6 @@ from mcp.shared.message import SessionMessage
 from mcp.shared.session import RequestResponder
 
 if not sys.warnoptions:
-    import warnings
-
     warnings.simplefilter("ignore")
 
 logging.basicConfig(level=logging.INFO)

src/mcp/client/auth/extensions/client_credentials.py

@@ -9,6 +9,7 @@ Provides OAuth providers for machine-to-machine authentication flows:
 """
 
 import time
+import warnings
 from collections.abc import Awaitable, Callable
 from typing import Any, Literal
 from uuid import uuid4
@@ -409,8 +410,6 @@ class RFC7523OAuthClientProvider(OAuthClientProvider):
         timeout: float = 300.0,
         jwt_parameters: JWTParameters | None = None,
     ) -> None:
-        import warnings
-
         warnings.warn(
             "RFC7523OAuthClientProvider is deprecated. Use ClientCredentialsOAuthProvider "
             "or PrivateKeyJWTOAuthProvider instead.",