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My chatbot got one fact wrong three turns ago, and now it keeps treating that wrong fact as settled truth in every answer since.
What you'll have at the end
A conversation history with the poisoned turn replaced, verified clean across three follow-up questions that used to repeat the error
You need
A running chat built through an LLM API's message array, not a consumer chat app, where an earlier assistant turn stated a number your own source data does not support, and at least one later turn has already repeated or built on it.
Not covered
A wrong fact planted by a bad tool result or a stale retrieved document needs a different repair upstream, at the tool or retrieval step itself, and isn't covered here.
Checked 18 Aug 2026
Part of the Context Engineering cookbook