Ensure old settings access still works

src/fastmcp/settings.py

@@ -73,6 +73,8 @@ class Settings(BaseSettings):
         dotenv_settings: PydanticBaseSettingsSource,
         file_secret_settings: PydanticBaseSettingsSource,
     ) -> tuple[PydanticBaseSettingsSource, ...]:
+        # can remove this classmethod after deprecated FASTMCP_SERVER_ prefix is
+        # removed
         return (
             init_settings,
             ExtendedEnvSettingsSource(settings_cls),
@@ -80,6 +82,20 @@ class Settings(BaseSettings):
             file_secret_settings,
         )
 
+    @property
+    def settings(self) -> Self:
+        """
+        This property is for backwards compatibility with FastMCP < 2.8.0,
+        which accessed fastmcp.settings.settings
+        """
+        # Deprecated in 2.8.0
+        warnings.warn(
+            "Using fastmcp.settings.settings is deprecated. Use fastmcp.settings instead.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        return self
+
     home: Path = Path.home() / ".fastmcp"
 
     test_mode: bool = False

tests/deprecated/{test_server_init_kwargs.py → test_settings.py}

@@ -330,3 +330,22 @@ class TestDeprecatedEnvironmentVariables:
                 os.environ[env_var_name] = original_value
             else:
                 os.environ.pop(env_var_name, None)
+
+
+class TestDeprecatedSettingsProperty:
+    """Test deprecated settings property access."""
+
+    def test_settings_property_deprecation_warning(self):
+        """Test that accessing fastmcp.settings.settings raises a deprecation warning."""
+        from fastmcp import settings
+
+        with pytest.warns(
+            DeprecationWarning,
+            match=r"Using fastmcp\.settings\.settings is deprecated\. Use fastmcp\.settings instead\.",
+        ):
+            # Access the deprecated property
+            deprecated_settings = settings.settings
+
+        # Verify it still returns the same settings object
+        assert deprecated_settings is settings
+        assert isinstance(deprecated_settings, Settings)