diff --git a/metaflow/metaflow_config.py b/metaflow/metaflow_config.py
index b13de89c986..75343a4fe08 100644
--- a/metaflow/metaflow_config.py
+++ b/metaflow/metaflow_config.py
@@ -1,6 +1,10 @@
 import os
 import sys
 import types
+import uuid
+import datetime
+
+from typing import Dict, List, Union, Tuple as TTuple
 
 from metaflow.exception import MetaflowException
 from metaflow.metaflow_config_funcs import from_conf, get_validate_choice_fn
@@ -615,6 +619,56 @@ def get_pinned_conda_libs(python_version, datastore_type):
     return pins
 
 
+###
+# Runner API type mappings
+# Extensions can add custom Click parameter types via get_click_to_python_types
+###
+def get_click_to_python_types():
+    """
+    Returns the mapping from Click parameter types to Python types for Runner API.
+    Extensions can override this function to add custom type mappings.
+    """
+    from metaflow._vendor.click.types import (
+        BoolParamType,
+        Choice,
+        DateTime,
+        File,
+        FloatParamType,
+        IntParamType,
+        Path,
+        StringParamType,
+        Tuple,
+        UUIDParameterType,
+    )
+    from metaflow.parameters import JSONTypeClass
+    from metaflow.includefile import FilePathClass
+    from metaflow.user_configs.config_options import (
+        LocalFileInput,
+        MultipleTuple,
+        ConfigValue,
+    )
+
+    # Define JSON type for type hints
+    JSON = Union[Dict[str, "JSON"], List["JSON"], str, int, float, bool, None]
+
+    return {
+        StringParamType: str,
+        IntParamType: int,
+        FloatParamType: float,
+        BoolParamType: bool,
+        UUIDParameterType: uuid.UUID,
+        Path: str,
+        DateTime: datetime.datetime,
+        Tuple: tuple,
+        Choice: str,
+        File: str,
+        JSONTypeClass: JSON,
+        FilePathClass: str,
+        LocalFileInput: str,
+        MultipleTuple: TTuple[str, Union[JSON, ConfigValue]],
+    }
+
+
 # Check if there are extensions to Metaflow to load and override everything
 try:
     from metaflow.extension_support import get_modules
@@ -650,6 +704,16 @@ def _new_get_pinned_conda_libs(
                 if any(" " in x for x in o):
                     raise ValueError("Decospecs cannot contain spaces")
                 _TOGGLE_DECOSPECS.extend(o)
+            elif n == "get_click_to_python_types":
+                # Extension provides additional Click type mappings for Runner API
+                # Merge extension's types with base types
+                def _new_get_click_to_python_types(f1=globals()[n], f2=o):
+                    d1 = f1()
+                    d2 = f2()
+                    d1.update(d2)
+                    return d1
+
+                globals()[n] = _new_get_click_to_python_types
             elif not n.startswith("__") and not isinstance(o, types.ModuleType):
                 globals()[n] = o
     # If DEFAULT_DECOSPECS is set, use that, else extrapolate from extensions
diff --git a/metaflow/runner/click_api.py b/metaflow/runner/click_api.py
index 202eff6dc05..cf53a550090 100644
--- a/metaflow/runner/click_api.py
+++ b/metaflow/runner/click_api.py
@@ -57,26 +57,14 @@
 )
 from metaflow.user_decorators.user_flow_decorator import FlowMutator
 
+# Import Click type mappings from config (allows extensions to add custom types)
+from metaflow.metaflow_config import get_click_to_python_types
+
+click_to_python_types = get_click_to_python_types()
+
 # Define a recursive type alias for JSON
 JSON = Union[Dict[str, "JSON"], List["JSON"], str, int, float, bool, None]
 
-click_to_python_types = {
-    StringParamType: str,
-    IntParamType: int,
-    FloatParamType: float,
-    BoolParamType: bool,
-    UUIDParameterType: uuid.UUID,
-    Path: str,
-    DateTime: datetime.datetime,
-    Tuple: tuple,
-    Choice: str,
-    File: str,
-    JSONTypeClass: JSON,
-    FilePathClass: str,
-    LocalFileInput: str,
-    MultipleTuple: TTuple[str, Union[JSON, ConfigValue]],
-}
-
 
 def _method_sanity_check(
     possible_arg_params: TOrderedDict[str, click.Argument],