Autogen :Why is my first node in GraphFlow called twice?

[haiongngoai]

Hi everyone,

I'm building a GraphFlow using autogen-agentchat and running into an issue where the first node (start_agent) is being executed twice, even though I’ve already defined conditional branching.

Here is a simplified version of my graph setup:

builder = DiGraphBuilder()

builder.add_node(self.start_agent)

builder.add_node(self.validate_input_agent)

builder.add_node(self.validate_input_exist_agent)

builder.add_node(self.confirm_agent)

builder.add_node(self.error_agent)

builder.set_entry_point(self.start_agent)

builder.add_edge(self.start_agent, self.validate_input_agent, condition='{"status": "error"}')

builder.add_edge(self.start_agent, self.validate_input_exist_agent, condition='{"status": "ok"}')

builder.add_edge(self.validate_input_exist_agent, self.confirm_agent, condition="ok")

builder.add_edge(self.validate_input_exist_agent, self.error_agent, condition="error")

Despite that, I see two outputs from start_agent, both "ok" and "error", being generated back-to-back. This causes both conditional branches to trigger, here is my logs

🔍 Kiểm tra: source='user' models_usage=None metadata={} content='{"metadata": {"task_name": "nh\\u00f4m k\\u00ednh Ph\\u01b0\\u01a1ng Mai", "project": "test_zalo", "action": "create", "confirm": false}, "missing_fields": []}' type='TextMessage' 🧩 type: <class 'autogen_agentchat.messages.TextMessage'> source: user

🔍 Kiểm tra: source='start_agent' models_usage=RequestUsage(prompt_tokens=200, completion_tokens=7) metadata={} content='{"status": "ok"}' type='TextMessage' 🧩 type: <class 'autogen_agentchat.messages.TextMessage'> source: start_agent

🔍 Kiểm tra: source='start_agent' models_usage=RequestUsage(prompt_tokens=211, completion_tokens=7) metadata={} content='{"status": "error"}' type='TextMessage' 🧩 type: <class 'autogen_agentchat.messages.TextMessage'> source: start_agent

I'm not sure why this happens. I expect only one of the edges to be taken based on the single output from start_agent.

Any idea what I might be doing wrong here? Do I need to add some filter or condition to prevent duplicate execution of the entry node?

[ekzhu]

Which version are you using? The latest code in main has updated the graph flow execution logic

[haiongngoai]

i used 0.5.7 latest verssion @ekzhu

[ekzhu]

I think the next version should fix this.

[haiongngoai]

thank you, Mr. @ekzhu hope 0.5.8 official will release soon.