Multi-Tenant Agent Memory: Scoping, Authorization, and Isolation

Multi-tenant agent memory requires authorization and a stable, server-derived scope for every write, retrieval, update, deletion, cache access, and background job, as namespaces or container tags alone do not establish permission boundaries. Applications should map authenticated tenant and user identities to opaque, stable scope IDs, use distinct document identifiers for separate conversations, and authorize personal and shared knowledge sources independently while preserving their provenance. A shared memory store can provide logical isolation if access controls and scoped queries are enforced, while dedicated databases or deployments may be justified by contractual, regional, recovery, or resource-isolation needs but do not eliminate authorization requirements. Security should be tested with adversarial multi-tenant scenarios, including duplicate user IDs, forged container identifiers, cross-scope document lookups, cache reuse, revoked access, and background retries, with verification extending to retrieved context and model input rather than final answers alone. Deletion must cover associated memories as well as application-controlled exports, caches, logs, and pending ingestion, while performance testing should separately assess noisy-neighbor effects through per-tenant measurements, quotas, scheduling, or workload separation.

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