Shared Agent Memory Is a Permissions Problem

Shared agent memory, often perceived as a productivity tool, is fundamentally a permissions issue that requires careful management of access rights and decision-making protocols. Products like MemBridge facilitate this by maintaining context across sessions, but the challenge lies in determining who can read or write memory under specific task contexts, as shared memory may contain sensitive information. To address this, a robust runtime authorization model is necessary, involving checks at retrieval and write times and considering various factors such as project scope, teammate identity, and task constraints. This ensures immediate revocation of access when necessary and aligns with shared MCP configuration patterns for consistent control semantics. Different security measures like redaction, encryption, and runtime authorization serve distinct purposes, with the latter enforcing least privilege access in real-time. Relationship-based access control (ReBAC) offers a clear model by linking humans, agents, teams, projects, and memory entries, simplifying policy enforcement and revocation. The safest approach to permissions involves intersection-based delegation, combining human rights, project policies, and agent scopes. Permit is proposed as the central authority for runtime enforcement, providing a consistent and auditable decision-making process across various tools and platforms, ensuring that memory servers remain secure and efficient without bypassing access controls.

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