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fix(ai-chat) prevent duplicate assistant persistence on history round-trips #958

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Merged
threepointone merged 5 commits into from
Feb 21, 2026
+253 −63
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fix(ai-chat) prevent duplicate assistant persistence on history round-trips #958

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bda1522
fix(ai-chat): reconcile assistant IDs to prevent duplicate persistence
whoiskatrin Feb 20, 2026
1525c15
docs(playground): escape wildcard in testing note
whoiskatrin Feb 20, 2026
171d0a5
PR review: approve with minor suggestions
ask-bonk[bot] Feb 20, 2026
10b657a
test(ai-chat): cover repeated assistant text ID reconciliation
whoiskatrin Feb 20, 2026
3cbb85b
Merge branch 'main' into assistant-msgs-bug
whoiskatrin Feb 21, 2026
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7 changes: 7 additions & 0 deletions .changeset/calm-pens-juggle.md
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"@cloudflare/ai-chat": patch
---

Fix duplicate assistant message persistence when clients resend full history with local assistant IDs that differ from server IDs.

`AIChatAgent.persistMessages()` now reconciles non-tool assistant messages against existing server history by content and order, reusing the server ID instead of inserting duplicate rows.
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