This release introduces several breaking changes and significant feature updates. Developers who recently integrated with projects.locations.collections.engines.assistants.agents.toolCalls.operations.get (introduced on 2026-10-08) or projects.locations.collections.engines.collaborativeProjects.knowledgeSpaces.operations.get (introduced on 2026-09-23) must update their code immediately, as these methods have been removed. Additionally, the newly introduced projects.locations.knowledgeSpaces.operations.get method now strictly requires the name parameter.
On the feature front, you can now configure OAuth providers that are only reachable over private networks using the new privateNetworkConfig in GoogleCloudDiscoveryengineV1alphaAuthorizationServerSideOAuth2. Data stores can be restricted to specific notebooks via the new notebooks array in GoogleCloudDiscoveryengineV1alphaDataStoreFederatedSearchConfigNotebooklmConfig (also available in V1 and V1beta). Fine-tune search behavior with new partialMatchableOption and prefixMatchableOption fields in GoogleCloudDiscoveryengineV1alphaFieldConfig. Feedback mechanisms are enhanced with GOOGLE_AGENTSPACE_DESKTOP as a feedbackSource and new stepSeqNum, trajectoryId fields in GoogleCloudDiscoveryengineV1alphaFeedbackConversationInfo. Minor updates include clarified descriptions for the GRACE_PERIOD state in license configurations.
