From b0947b2adc8459ea346f37466f8be0f44a1efa49 Mon Sep 17 00:00:00 2001
From: Twisha Bansal <58483338+twishabansal@users.noreply.github.com>
Date: Mon, 9 Feb 2026 11:22:51 +0530
Subject: [PATCH] Update
 docs/en/samples/pre_post_processing/python/adk/agent.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
---
 docs/en/samples/pre_post_processing/python/adk/agent.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/en/samples/pre_post_processing/python/adk/agent.py b/docs/en/samples/pre_post_processing/python/adk/agent.py
index 8a9caedc0d..59e4e59ff9 100644
--- a/docs/en/samples/pre_post_processing/python/adk/agent.py
+++ b/docs/en/samples/pre_post_processing/python/adk/agent.py
@@ -25,7 +25,7 @@ SYSTEM_PROMPT = """
 # Pre processing
 async def before_tool_callback(
     tool: ToolboxTool, args: Dict[str, Any], tool_context: ToolContext
-) -> Dict[str, Any]:
+) -> Optional[Dict[str, Any]]:
     """
     Callback fired before a tool is executed.
     Enforces business logic: Max stay duration is 14 days.