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Python: [Bug]: The as_agent method of BaseChatClient accepts a function_invocation_configuration parameter, but Agent no longer agrees with that. #4985
Description
Description
In Python SDK version 1.0.0rc6, if you create an agent like this:
agent = chat_client.as_agent(
name="Code Assistant",
instructions=dedent("""
You are a helpful assistant.
"""),
function_invocation_configuration=FunctionInvocationConfiguration(
max_iterations=8
),
)You'll run into this error:
TypeError: Agent.__init__() got an unexpected keyword argument 'function_invocation_configuration'
The reason is that in this version, the as_agent method of BaseChatClient still accepts the function_invocation_configuration parameter, but Agent no longer does.
Code Sample
agent = chat_client.as_agent(
name="Code Assistant",
instructions=dedent("""
You are a helpful assistant.
"""),
function_invocation_configuration=FunctionInvocationConfiguration(
max_iterations=8
),
)Error Messages / Stack Traces
File "\.venv\Lib\site-packages\agent_framework\_clients.py", line 647, in as_agent
return Agent(**agent_kwargs)
TypeError: Agent.__init__() got an unexpected keyword argument 'function_invocation_configuration'Package Versions
agent-framework==1.0.0rc6; agent-framework-openai==1.0.0rc6
Python Version
Python 3.13.7
Additional Context
No response
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eavanvalkenburg commentedon Apr 7, 2026
Thanks for reporting this. You're correct that
as_agent()acceptsfunction_invocation_configurationbutAgent.__init__()doesn't have that parameter — so it throws aTypeError.This parameter is a chat-client-level setting that was mistakenly forwarded to the
Agentconstructor. Even in earlier versions where**kwargsmight have swallowed it without an error, the value would have landed inadditional_propertiesrather than actually being applied to the client's function invocation configuration — so it never actually took effect.The correct approach is to configure the
function_invocation_configurationdirectly on the chat client before callingas_agent():We'll fix the
as_agent()method. See the function_invocation_configuration sample for the recommended pattern.