fix:Add disallowTransferToParent check to parent agent transfer condition

[JinXingJX]

Only allow transfer to parent agent when both conditions are met:

• Parent agent exists (agent.parentAgent() != null)
• Transfer to parent is allowed (!agent.disallowTransferToParent())

This prevents unwanted transfers to parent agents when explicitly disabled. Aligns Java implementation with Python version for consistency.

[gemini-code-assist]

Summary of Changes

Hello @JinXingJX, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the agent transfer mechanism by introducing a new condition that prevents an agent from transferring to its parent if such a transfer is explicitly disallowed. This change ensures that transfers only occur when both a parent agent exists and the transfer is permitted, enhancing consistency and control over agent interactions.

Highlights

• Agent Transfer Logic Update: The condition for allowing an agent to transfer to its parent has been updated to include a check for !agent.disallowTransferToParent(). This prevents transfers to parent agents when they are explicitly disabled, aligning the Java implementation with its Python counterpart.

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[gemini-code-assist]

Code Review

This pull request adds a check for disallowTransferToParent when constructing the LLM prompt, ensuring that instructions to transfer to a parent agent are only provided when it's allowed. This change correctly aligns the prompt generation logic with the agent transfer target selection logic, preventing potentially confusing instructions for the LLM. I have added one comment pointing out a related, pre-existing issue in the prompt text that could be addressed to further improve clarity.

[gemini-code-assist]

The added condition !agent.disallowTransferToParent() is correct and aligns the behavior with getTransferTargets.

On a related note, the instruction generated within this if block (on lines 94-96) seems to contain a contradiction. It says, ...If you don't have parent agent, try answer by yourself, but this code block is only entered if agent.parentAgent() != null. This might confuse the LLM.

Since you are working in this area, you might consider removing the contradictory part of the instruction to improve prompt clarity. For example:

sb.append(
    ".If neither the other agents nor you are best for answering the question according to"
        + " the descriptions, transfer to your parent agent.\n");