fix(agents): fix agent related doc/ sample issues (#463)

* fix(agents): fix agent related doc/ sample issues

* fixes 405

---------

Co-authored-by: Lavi Nigam <[email protected]>

Author: Sita04

docs/deploy/cloud-run.md

@@ -16,6 +16,7 @@ To proceed, confirm that your agent code is configured as follows:
     1. Agent code is in a file called `agent.py` within your agent directory.
     2. Your agent variable is named `root_agent`.
     3. `__init__.py` is within your agent directory and contains `from . import agent`.
+    4. Your `requirements.txt` file is present in the agent directory.
 
 === "Java"
 

docs/tools/built-in-tools.md

@@ -117,7 +117,7 @@ to use built-in tools with other tools by using multiple agents:
         instruction="""
         You're a specialist in Code Execution
         """,
-        code_executor=BuiltInCodeExecutor(),
+        tools=[BuiltInCodeExecutor],
     )
     root_agent = Agent(
         name="RootAgent",
@@ -203,8 +203,7 @@ to use built-in tools with other tools by using multiple agents:
         name="RootAgent",
         model="gemini-2.0-flash",
         description="Root Agent",
-        tools=[custom_function], 
-        code_executor=BuiltInCodeExecutor() # <-- not supported when used with tools
+        tools=[custom_function, BuiltInCodeExecutor], # <-- BuiltInCodeExecutor not supported when used with tools
     )
     ```
 
@@ -244,7 +243,7 @@ is **not** currently supported:
         instruction="""
         You're a specialist in Code Execution
         """,
-        code_executor=BuiltInCodeExecutor(),
+        tools=[BuiltInCodeExecutor],
     )
     root_agent = Agent(
         name="RootAgent",