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Fix JSONDecodeError when tool_call.arguments is empty string in AssistantAgent._execute_tool_call #7128

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Fix JSONDecodeError when tool_call.arguments is empty string in AssistantAgent._execute_tool_call #7128

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6 changes: 5 additions & 1 deletion python/packages/autogen-agentchat/src/autogen_agentchat/agents/_assistant_agent.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1544,7 +1544,11 @@ async def _execute_tool_call(
"""Execute a single tool call and return the result."""
# Load the arguments from the tool call.
try:
arguments = json.loads(tool_call.arguments)
# Handle empty string as empty dict to support tools with no parameters
if not tool_call.arguments or tool_call.arguments.strip() == "":
arguments = {}
else:
arguments = json.loads(tool_call.arguments)
except json.JSONDecodeError as e:
return (
tool_call,
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