diff --git a/agents-api/agents_api/activities/utils.py b/agents-api/agents_api/activities/utils.py
index a9d4a11f2..99fc91da5 100644
--- a/agents-api/agents_api/activities/utils.py
+++ b/agents-api/agents_api/activities/utils.py
@@ -13,6 +13,7 @@
 from dataclasses import dataclass
 from threading import Lock as ThreadLock
 from typing import Any, ParamSpec, TypeVar
+from functools import reduce
 
 import re2
 from beartype import beartype
@@ -140,6 +141,7 @@ def safe_extract_json(string: str):
     "sum": sum,
     "tuple": tuple,
     "zip": zip,
+    "reduce": reduce,
     # Safe versions of potentially dangerous functions
     "range": safe_range,
     "load_json": safe_json_loads,