Agent Memory Eviction: What to Leave Out of the Next Prompt

Context eviction concerns excluding information from a model’s next prompt without deleting it from storage, requiring selection policies based on task relevance, authority, current constraints, and a limited context budget rather than recency alone. Important evidence, exact identifiers, decisions, corrections, amounts, and unresolved blockers should be preserved when needed, while large logs, duplicate obsolete information, and tangential history can remain retrievable through source references. The guidance recommends comparing recency-only selection with relevance- and priority-based approaches, measuring whether necessary evidence survives within the same token allowance and avoiding unnecessary context that increases distraction and cost. Omitted material should retain a recovery path for later retrieval, and prompt-selection rules should remain distinct from storage retention, forgetting, and user-facing deletion policies. Testing should include cases where recency is misleading, while broader hot, warm, and cold memory strategies can separate prompt eligibility from long-term evidence retention.

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