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SingleThreadedAgentRuntime to use subclass check for factory_wrapper instead of equality by ZenWayne · Pull Request #6731 · microsoft/autogen · GitHub
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@ZenWayne ZenWayne commented Jun 29, 2025

The agent factory in SingleThreadedAgentRuntime does not support customized class that inherited from ChatAgentContainer
Now change the judge expression to

if expected_class is not None and not isinstance(agent_instance, expected_class):
raise ValueError("Factory registered using the wrong type.")

instead of exactly match

Why are these changes needed?

To support Customized ChatAgentContainer that can ajust the logic after an event or a message published by ChatAgentContainer, which achieved by inheriting ChatAgentContainer

Related issue number

Resolves #6730

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@ekzhu ekzhu requested a review from Copilot June 29, 2025 15:12
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Pull Request Overview

This PR updates the agent factory in SingleThreadedAgentRuntime to accept subclasses of ChatAgentContainer by replacing a strict type equality check with an isinstance check.

  • Switched type_func_alias(agent_instance) != expected_class to not isinstance(agent_instance, expected_class)
  • Continues to raise a ValueError only when the instance is not an instance or subclass of the expected class
Comments suppressed due to low confidence (1)

python/packages/autogen-core/src/autogen_core/_single_threaded_agent_runtime.py:906

  • Add a unit test that verifies a subclass of the expected class is accepted by this check and that non-matching types still trigger the error.
            if expected_class is not None and not isinstance(agent_instance, expected_class):

@ZenWayne
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this is because participant_factory is hard coded in BaseGroupChat._create_participant_factory(_base_group_chat.py#L146) so that when it called by singlethread runtime, the agent factory requiement does not satified because it has to be match exactly as ChatAgentContainer
Related function call

  1. BaseGroupChat._create_participant_factory(_base_group_chat.py#L146)
  2. BaseGroupChat._init(_base_group_chat.py#L167)
  3. factory called(_single_threaded_agent_runtime.py#L906)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@ekzhu
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ekzhu commented Jul 7, 2025

@ZenWayne I made some changes please review.

@ekzhu ekzhu enabled auto-merge (squash) July 7, 2025 23:00
@ekzhu ekzhu disabled auto-merge July 7, 2025 23:00
@ekzhu ekzhu changed the title add customized ChatAgentContainer support SingleThreadedAgentRuntime to use subclass check for factory_wrapper instead of equality Jul 7, 2025
@ekzhu ekzhu merged commit 4ccac43 into microsoft:main Jul 7, 2025
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codecov bot commented Jul 7, 2025

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.44%. Comparing base (02e6574) to head (caee8e1).
Report is 1 commits behind head on main.

Files with missing lines Patch % Lines
...src/autogen_core/_single_threaded_agent_runtime.py 50.00% 1 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main    #6731      +/-   ##
==========================================
+ Coverage   76.42%   80.44%   +4.01%     
==========================================
  Files         343      237     -106     
  Lines       20982    17864    -3118     
  Branches      406        0     -406     
==========================================
- Hits        16035    14370    -1665     
+ Misses       4674     3494    -1180     
+ Partials      273        0     -273     
Flag Coverage Δ
unittests 80.44% <50.00%> (+4.01%) ⬆️

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ZenWayne commented Jul 8, 2025

LGTM, Thanks for the merge!

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Customized ChatAgentContainer not support

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