Fix IndexError in ParallelAgent by adding events length check

[prolsen]

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[gemini-code-assist]

Summary of Changes

Hello @prolsen, 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 addresses a potential runtime IndexError within the _run_async_impl function of the llm_agent.py file. By adding a simple conditional check, the change ensures that the code safely accesses list elements, thereby enhancing the stability and robustness of the ParallelAgent component and preventing unexpected crashes in specific scenarios.

Highlights

• Error Prevention: Introduced a length check for the events list to prevent an IndexError when attempting to access events[-2] if the list contains fewer than two elements.

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[gemini-code-assist]

Code Review

The pull request correctly fixes a potential IndexError by adding a length check before accessing events[-2]. I've also suggested a small refactoring to make the condition more concise and Pythonic using slicing and any(), which also handles edge cases gracefully.

[gemini-code-assist]

While the fix is correct, the logic to check the last two events can be simplified and made more robust using a slice and any(). This avoids manual length checks and is more idiomatic. Using [::-1] on the slice preserves the evaluation order of checking the last event first.

      if any(ctx.should_pause_invocation(event) for event in events[-2:][::-1]):

[adk-bot]

Response from ADK Triaging Agent

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[ryanaiagent]

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