ADK multi agent handoff issue

[Vnk0410]

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Describe the Bug:
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I have created a root agent with multiple subagent, the multiple agent handoff is not happening, either one of the agent is executed. the others are not taken into consideration

Steps to Reproduce:
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1. Install '...'
2. Run '....'
3. Open '....'
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Expected Behavior:
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Observed Behavior:
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Environment Details:

• ADK Library Version (pip show google-adk): 1.31.1
• Desktop OS:** [e.g., macOS, Linux, Windows]
• Python Version (python -V):

Model Information:

• Are you using LiteLLM: Yes/No Yes
• Which model is being used: (e.g., gemini-2.5-pro) OpenAI

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Regression:
Did this work in a previous version of ADK? If so, which one?

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[llalitkumarrr]

Hello @KalRam0410 ,

Could you please share the reproduction steps or reproducible code? Also, please upgrade to google-adk==1.34.1, test with this version and share your observations with us.

[Vnk0410]

Steps to Reproduce:

Create an orchestrator agent with two sub agents

Prompt : (ie: what is the total outcome of the customer based on the april and draw a scenario of raining)

Actual Behavior:

The agent responds with one task complete, but is unable to do both.

Expected Behavior:

The agent should be able to complete multiple agent handoffs in a single message request.

The scenario which I see here is, each time the user always need to include orchestration instruction, do I need to come up with some default prompting that leads to better agent behaviour??

Is there any better solution