Beta Sessions API replaced by Memory Stores and Memories APIs
This is a breaking change — integrations that rely on the affected behaviour will need updates before the change rolls out.
What changed
The beta endpoint /v1/sessions?beta=true (operationId BetaCreateSession) has been removed and replaced by a new /v1/memory_stores/{memory_store_id}/memories?beta=true endpoint (operationId BetaCreateMemory). This is a breaking change for any client using the sessions beta — request/response schemas (BetaManagedAgentsCreateSessionParams → BetaManagedAgentsCreateMemoryParams, BetaManagedAgentsSession → BetaManagedAgentsMemory) have changed as well. Additionally, many new beta webhook event types are added (deployment.*, deployment_run.*, environment.*, memory_store.*, agent.updated) and error responses now reference BetaManagedAgentsErrorResponse instead of BetaErrorResponse.