diff --git a/letta/constants.py b/letta/constants.py
index acaaca2c..ea42306a 100644
--- a/letta/constants.py
+++ b/letta/constants.py
@@ -150,6 +150,7 @@ CORE_MEMORY_BLOCK_CHAR_LIMIT: int = 5000
 
 # Function return limits
 FUNCTION_RETURN_CHAR_LIMIT = 6000  # ~300 words
+BASE_FUNCTION_RETURN_CHAR_LIMIT = 1000000  # very high (we rely on implementation)
 
 MAX_PAUSE_HEARTBEATS = 360  # in min
 
diff --git a/letta/services/tool_manager.py b/letta/services/tool_manager.py
index 2e831f92..0aa08206 100644
--- a/letta/services/tool_manager.py
+++ b/letta/services/tool_manager.py
@@ -2,7 +2,7 @@ import importlib
 import warnings
 from typing import List, Optional
 
-from letta.constants import BASE_MEMORY_TOOLS, BASE_TOOLS, MULTI_AGENT_TOOLS
+from letta.constants import BASE_FUNCTION_RETURN_CHAR_LIMIT, BASE_MEMORY_TOOLS, BASE_TOOLS, MULTI_AGENT_TOOLS
 from letta.functions.functions import derive_openai_json_schema, load_function_set
 from letta.log import get_logger
 from letta.orm.enums import ToolType
@@ -200,6 +200,7 @@ class ToolManager:
                             tags=tags,
                             source_type="python",
                             tool_type=tool_type,
+                            return_char_limit=BASE_FUNCTION_RETURN_CHAR_LIMIT,
                         ),
                         actor=actor,
                     )