diff --git a/src/mistralai/extra/mcp/auth.py b/src/mistralai/extra/mcp/auth.py
index 909f5d4a..40d28ebe 100644
--- a/src/mistralai/extra/mcp/auth.py
+++ b/src/mistralai/extra/mcp/auth.py
@@ -33,10 +33,12 @@ class AsyncOAuth2Client(AsyncOAuth2ClientBase):
 
     @classmethod
     def from_oauth_params(cls, oauth_params: OAuthParams) -> "AsyncOAuth2Client":
+        # Store attribute access in locals for micro-optimization in this tight path
+        scheme = oauth_params.scheme
         return cls(
             client_id=oauth_params.client_id,
             client_secret=oauth_params.client_secret,
-            scope=oauth_params.scheme.scope,
+            scope=scheme.scope,
         )
 
 
diff --git a/src/mistralai/extra/mcp/sse.py b/src/mistralai/extra/mcp/sse.py
index 2dfe7a2d..b9586e5c 100644
--- a/src/mistralai/extra/mcp/sse.py
+++ b/src/mistralai/extra/mcp/sse.py
@@ -46,7 +46,7 @@ class MCPClientSSE(MCPClientBase):
 
     def __init__(
         self,
-        sse_params: SSEServerParams,
+        sse_params: "SSEServerParams",
         name: Optional[str] = None,
         oauth_params: Optional[OAuthParams] = None,
         auth_token: Optional[OAuth2Token] = None,
@@ -55,6 +55,8 @@ def __init__(
         self._sse_params = sse_params
         self._oauth_params: Optional[OAuthParams] = oauth_params
         self._auth_token: Optional[OAuth2Token] = auth_token
+        self._oauth_client: Optional[AsyncOAuth2Client] = None
+        self._oauth_client_params: Optional[OAuthParams] = None
 
     @cached_property
     def base_url(self) -> str:
@@ -68,14 +70,21 @@ def set_oauth_params(self, oauth_params: OAuthParams):
 
     async def get_auth_url_and_state(self, redirect_url: str) -> tuple[str, str]:
         """Create the authorization url for client to start oauth flow."""
-        if self._oauth_params is None:
+        oauth_params = self._oauth_params
+        if oauth_params is None:
             raise MCPAuthException(
                 "Can't generate an authorization url without oauth_params being set, "
                 "make sure the oauth params have been set."
             )
-        oauth_client = AsyncOAuth2Client.from_oauth_params(self._oauth_params)
+
+        # Only reconstruct client if params have changed or not yet initialized
+        if self._oauth_client is None or self._oauth_client_params is not oauth_params:
+            self._oauth_client = AsyncOAuth2Client.from_oauth_params(oauth_params)
+            self._oauth_client_params = oauth_params
+
+        oauth_client = self._oauth_client
         auth_url, state = oauth_client.create_authorization_url(
-            self._oauth_params.scheme.authorization_url, redirect_uri=redirect_url
+            oauth_params.scheme.authorization_url, redirect_uri=redirect_url
         )
         return auth_url, state