feat: Add early exit mechanism to SequentialAgent using escalate action #2999
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Summary of ChangesHello @tommyhutcheson, 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 introduces a critical early exit mechanism for the Highlights
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Response from ADK Triaging Agent Hello @tommyhutcheson, thank you for your contribution! To help us track and review this new feature, could you please create and associate a GitHub issue with this PR? Additionally, since this change introduces a new user-facing tool ( This information will help reviewers to review your PR more efficiently. Thanks! |
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Code Review
This pull request introduces an early exit mechanism for SequentialAgent, which is a great feature for controlling agent flow. The implementation is clean and the new exit_sequence tool is well-defined. The tests are also comprehensive and cover the main scenarios.
I have a couple of suggestions for improvement:
- In
sequential_agent.py, the early exit logic can be simplified for better readability. - In
test_sequential_agent.py, one of the assertions is a bit confusing and could be removed to improve test clarity.
Additionally, I noticed that the early exit mechanism has been implemented for _run_async_impl, but it seems to be missing from _run_live_impl. For consistency and to fully implement the feature, you should consider adding similar logic to _run_live_impl to handle the escalate action and prevent subsequent agents from running in a live session as well.
Overall, this is a solid contribution. My comments are aimed at refining the implementation.
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…lAgent similar to what exists in LoopAgent. Here's what was accomplished
…n the agent terminates the sequence immediately preventing subsequent agents from running.
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Summary
I have implemented an early exit mechanism for SequentialAgent similar to what exists in LoopAgent to resolve #3000
Documentation PR - google/adk-docs#707
Here's what was accomplished:
Implementation Complete
- New tool function that sets escalate=True and skip_summarization=True
- Proper docstring explaining when to use the tool
- Follows the same pattern as exit_loop tool
- Modified _run_async_impl to check for event.actions.escalate after each event
- Added early termination logic with break and return statements
- Prevents subsequent agents from executing when escalation is triggered
- Added import for exit_sequence
- Added to all list for public API
- test_run_async_with_escalate_action: Tests early exit when first agent escalates
- test_run_async_escalate_action_in_middle: Tests escalation in middle of sequence
- test_run_async_no_escalate_action: Ensures normal operation when no escalation
- All tests passing
Key Features