Add flag for disabling deprecation warnings

src/fastmcp/__init__.py

@@ -1,5 +1,6 @@
 """FastMCP - An ergonomic MCP interface."""
 
+import warnings
 from importlib.metadata import version
 from fastmcp.settings import Settings
 
@@ -22,3 +23,9 @@ __all__ = [
     "settings",
     "Image",
 ]
+
+
+if settings.deprecation_warnings:
+    warnings.simplefilter("default", DeprecationWarning)
+else:
+    warnings.simplefilter("ignore", DeprecationWarning)

src/fastmcp/settings.py

@@ -111,6 +111,20 @@ class Settings(BaseSettings):
         ),
     ] = True
 
+    deprecation_warnings: Annotated[
+        bool,
+        Field(
+            description=inspect.cleandoc(
+                """
+                Whether to show deprecation warnings. You can completely reset
+                Python's warning behavior by running `warnings.resetwarnings()`.
+                Note this will NOT apply to deprecation warnings from the
+                settings class itself.
+                """,
+            )
+        ),
+    ] = True
+
     client_raise_first_exceptiongroup_error: Annotated[
         bool,
         Field(