A persistence layer is the architectural tier responsible for durably storing and retrieving application state across sessions and process restarts. It abstracts the underlying storage technology, databases, object stores, or distributed logs, behind a uniform interface for reading and writing data. In agent and spatial-computing systems it preserves memory, anchors, and context so that state survives beyond a single runtime.
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- The layer mediates between in-memory application objects and durable backends, handling serialisation, transactions, indexing, and consistency guarantees. For autonomous agents it stores conversational memory and tool state, while for spatial computing it persists anchor poses and scene meshes so that virtual content reliably reattaches to the physical world across sessions.