Allow user-provided API key at runtime with OpenAPI tools

Is it possible for tools created with the OpenAPIToolset to use API keys provided by the user in chat?

Currently it seems that the auth_credential can only be set upon initialization. When using the adk api_server, this means credentials are shared between users since there is only one root_agent per app.

It would be helpful to support user-provided API keys at runtime, so that each user’s credentials can be used only within their own session. Could this feature be added, or is there a recommended pattern for handling per-user credentials in this scenario?

Thanks