What is InMemorySessionService in google-adk?

InMemorySessionService stores session state in process memory. It resets on restart, making it ideal for unit tests and local development without a persistent backend.

What should the lookup helper return when nothing has been saved?

It returns the default "ko". Only after a preference is saved should the lookup return that saved value instead of the default.

How do I verify that a preference was actually saved?

Call the save function and then look it up again. If the saved value comes back, it held; if only the default returns, the value did not stay.

Remembering language preference

Your task

Make the assistant remember which language to reply in (the preferred language). Once saved, it holds when you ask again on the next turn of the same session. Complete set_preferred_language and preferred_language. Note: uses google-adk session state. set_preferred_language(service, app_name, user_id, session_id, language) saves the preferred language (e.g. "en"). preferred_language(service, app_name, user_id, session_id) returns the saved preference, or "ko" when none is saved.

Ground rules

•use google-adk's InMemorySessionService for session management.
•keep the preferred language in session state.

Not required

•validating language codes.
•actual translation or reply generation.

▶About this challenge

This challenge asks you to complete two helper functions that save and retrieve a language preference using google-adk session state. One stores the preference, the other retrieves it, defaulting to "ko" when nothing is saved. The saved value must hold when looked up again on the next turn.

Store a language preference in google-adk session state and verify it still returns on the next turn (and defaults to "ko" when nothing is set). One helper saves the preference and the other reads it back, so the behavior worth checking is whether a saved value really survives to the following turn rather than only confirming the default.

What is InMemorySessionService in google-adk?: InMemorySessionService stores session state in process memory. It resets on restart, making it ideal for unit tests and local development without a persistent backend.
What should the lookup helper return when nothing has been saved?: It returns the default "ko". Only after a preference is saved should the lookup return that saved value instead of the default.
How do I verify that a preference was actually saved?: Call the save function and then look it up again. If the saved value comes back, it held; if only the default returns, the value did not stay.