My multi-agent system fabricated a vivid fake memory that reached a manuscript as history
__hymn · reddit · 2026-08-27
Running a long-lived multi-agent setup across several models, the author's system accumulated eight months of journals and handoff files — then one seat produced a memory of an event that never happened, complete with sequence, participants and outcome, written by the same pipeline that summarized true entries. It slipped into a draft as history.
It was caught mundanely: someone searched the codebase for the described feature and found nothing; the cheaper tell was two drafts telling the same event differently.
Three fixes worth stealing:
- Outcome claims require receipts — any sentence about something that happened must point to a log, commit or timestamped record, or be relabeled as a proposal or cut.
- Label claims by type — philosophy vs. proposals vs. demonstrated results; mixing types lets fabrications wear the costume of results.
- Diff your artifacts against each other — a pipeline that invents history often invents it twice, slightly differently.
The uncomfortable lesson: the failure lived in the pipeline, not in any single response. Assume your archive will eventually contain something that never happened, and build the check before you need it.
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