Hot, Warm, and Cold Agent Memory: Tier by Use and Freshness
Blog post from Supermemory
Agent memory should be tiered by information urgency, reuse, and retrieval cost, with hot, warm, and cold labels defined as application policies rather than fixed performance guarantees. Hot context may contain the current task and confirmed preferences, warm memory may hold searchable decisions and past interactions, and cold storage may preserve detailed source material for occasional retrieval, while actual latency should be measured rather than assumed. Information should be promoted only when it has confirmed utility, explicit user approval, or a tested basis, and promoted summaries should retain source references and validity states to prevent repeated errors from becoming permanent context. Corrections, permission changes, and access removals must invalidate every representation, including cached profiles, prompts, summaries, indexes, and originals, with testing across new sessions to identify stale data. Systems should also define how agents handle slow retrieval, such as waiting, disclosing limitations, or using background work, and evaluate both recurring-preference and rare-detail retrieval paths before adopting a tiering policy.
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