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perf: use incremental chat message fingerprinting #40

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Merged
charlesrhoward merged 2 commits into from
Feb 21, 2026
Merged

perf: use incremental chat message fingerprinting #40

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perf: use incremental chat message fingerprinting
charlesrhoward Feb 21, 2026
f72af4c
chore: retrigger checks for PR #40
charlesrhoward Feb 21, 2026
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38 changes: 32 additions & 6 deletions components/ai-chat-panel.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -436,12 +436,38 @@ export function AIChatPanel({ canvasDimensions }: AIChatPanelProps) {
}, [])

const getMessagesFingerprint = useCallback((msgs: UIMessage[]) => {
return JSON.stringify(
msgs.map((msg) => ({
id: msg.id,
...chatService.convertToDbMessage(msg),
})),
)
if (msgs.length === 0) return "empty"

const last = msgs[msgs.length - 1]
const lastWithMeta = last as UIMessage & { content?: string; createdAt?: Date | string }

let textPartLength = 0
let filePartCount = 0
let reasoningPartCount = 0
for (const part of last.parts || []) {
if (part.type === "text") {
textPartLength += part.text.length
} else if (part.type === "file") {
filePartCount += 1
} else if (part.type === "reasoning") {
Comment on lines +448 to +452
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@chatgpt-codex-connector chatgpt-codex-connector bot Feb 21, 2026

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P1 Badge Include tool invocation state in message fingerprint

This fingerprint only tracks message count plus coarse metadata from the last message (text length and part counts), so updates to tool-invocation parts are not detected when their count stays the same. In this component, addToolResult(...) mutates existing tool-call parts in place; if the tool state/output changes but lengths/counts do not, usePersistMessagesOnChange treats the chat as unchanged and skips cloud/local persistence, which can leave restored sessions with stale or incomplete tool-call state.

Useful? React with 👍 / 👎.

reasoningPartCount += 1
}
}

const createdAt =
lastWithMeta.createdAt instanceof Date ? lastWithMeta.createdAt.toISOString() : (lastWithMeta.createdAt ?? "")

return [
msgs.length,
last.id,
last.role,
createdAt,
lastWithMeta.content?.length ?? 0,
last.parts?.length ?? 0,
textPartLength,
filePartCount,
reasoningPartCount,
].join("|")
}, [])

useLoadChatHistory({
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