Why does tool confirmation not support DatabaseSessionService?

[mrcaidev]

I come across this limitation on ADK: Action confirmations.

The tool confirmation feature has the following limitations:

• DatabaseSessionService is not supported by this feature.
• VertexAiSessionService is not supported by this feature.

But when I test it myself, it seems to be working properly.

Why do we have this limitation?

[adk-bot]

Response from ADK Answering Agent (experimental, answer may be inaccurate)

TLDR: You are correct! It seems that the documentation is outdated and this limitation has been resolved. The feature was likely marked as not supporting DatabaseSessionService and VertexAiSessionService during its initial experimental release, and the documentation has not been updated since.

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Hello! Thank you for your question and for pointing out this discrepancy.

The Tool Confirmation feature was introduced in ADK v1.14.0 as an experimental feature. [1, 4] At the time of its initial release, there were likely complexities in ensuring the confirmation state could be reliably managed with persistent session backends like DatabaseSessionService and VertexAiSessionService. [3] This is why the documentation states they are not supported. [4]

However, as you've discovered, this limitation appears to have been addressed in a later version of ADK. Your own testing is a good indicator that the feature now works as expected with these session services.

The documentation for this feature has not yet been updated to reflect this change. Thank you for bringing this to our attention!

[1] CHANGELOG
[3] Session: Tracking Individual Conversations
[4] Get action confirmation for ADK Tools