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Xiang (Sean) Zhou
ee873cae2e
This change adds framework-level support for resolving toolset authentication before calling get_tools(). Key changes:
- Add _resolve_toolset_auth() method in BaseLlmFlow that iterates
through toolsets, checks for auth config, and resolves credentials
via CredentialManager before tool listing
- Add TOOLSET_AUTH_CREDENTIAL_ID_PREFIX constant for identifying
toolset auth requests
- Add skip logic in auth_preprocessor to not resume function calls
for toolset auth (they do not need it)
- Add get_auth_response() method to CallbackContext for retrieving
auth credentials from session state
- Update CredentialManager to accept CallbackContext instead of
requiring ToolContext
When a toolset needs authentication but credentials are not available, the flow yields an adk_request_credential event and interrupts the invocation, allowing the user to complete the OAuth flow before retrying.
Co-authored-by: Xiang (Sean) Zhou <seanzhougoogle@google.com>
PiperOrigin-RevId: 863543036