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fix: validate participants type in BaseGroupChat.__init__ #7607

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fix: validate participants type in BaseGroupChat.__init__ #7607

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06b826c
fix: validate participants type in BaseGroupChat.__init__
nileshpatil6 Apr 19, 2026
e87045b
fix: validate participants type in BaseGroupChat.__init__
nileshpatil6 Apr 20, 2026
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4 changes: 4 additions & 0 deletions ...on/packages/autogen-agentchat/src/autogen_agentchat/teams/_group_chat/_base_group_chat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,10 @@ def __init__(
):
self._name = name
self._description = description
if not isinstance(participants, list):
raise TypeError(
f"participants must be a list of ChatAgent or Team instances, got {type(participants).__name__!r}."
)
if len(participants) == 0:
raise ValueError("At least one participant is required.")
if len(participants) != len(set(participant.name for participant in participants)):
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