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docs(ai-chat): atomic onTurnComplete writes + Anthropic prose #3693

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ericallam merged 1 commit into from
May 21, 2026
+26 −20
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docs(ai-chat): atomic onTurnComplete writes + Anthropic prose #3693

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2 changes: 1 addition & 1 deletion docs/ai-chat/background-injection.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -154,7 +154,7 @@ export const myChat = chat.agent({
});
```

The self-review runs on `gpt-4o-mini` (fast, cheap) in the background. If the user sends another message before it completes, the coaching is still injected — `chat.inject()` persists across the idle wait.
The self-review runs on `claude-haiku-4-5` (fast, cheap) in the background. If the user sends another message before it completes, the coaching is still injected — `chat.inject()` persists across the idle wait.

## Other use cases

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21 changes: 12 additions & 9 deletions docs/ai-chat/lifecycle-hooks.mdx
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Expand Up @@ -412,15 +412,18 @@ Fires after each turn completes, after the response is captured and the stream i
export const myChat = chat.agent({
id: "my-chat",
onTurnComplete: async ({ chatId, uiMessages, runId, chatAccessToken, lastEventId }) => {
await db.chat.update({
where: { id: chatId },
data: { messages: uiMessages },
});
await db.chatSession.upsert({
where: { id: chatId },
create: { id: chatId, runId, publicAccessToken: chatAccessToken, lastEventId },
update: { runId, publicAccessToken: chatAccessToken, lastEventId },
});
// Atomic write — see Database persistence for the race-condition rationale
await db.$transaction([
db.chat.update({
where: { id: chatId },
data: { messages: uiMessages },
}),
db.chatSession.upsert({
where: { id: chatId },
create: { id: chatId, runId, publicAccessToken: chatAccessToken, lastEventId },
update: { runId, publicAccessToken: chatAccessToken, lastEventId },
}),
]);
},
run: async ({ messages, signal }) => {
return streamText({ model: anthropic("claude-sonnet-4-5"), messages, abortSignal: signal });
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23 changes: 13 additions & 10 deletions docs/ai-chat/patterns/database-persistence.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -258,16 +258,19 @@ export const myChat = chat.agent({
});
},
onTurnComplete: async ({ chatId, uiMessages, runId, chatAccessToken, lastEventId }) => {
// Persist assistant response + stream position
await db.chat.update({
where: { id: chatId },
data: { messages: uiMessages },
});
await db.chatSession.upsert({
where: { id: chatId },
create: { id: chatId, runId, publicAccessToken: chatAccessToken, lastEventId },
update: { runId, publicAccessToken: chatAccessToken, lastEventId },
});
// Persist assistant response + stream position atomically — see the
// race-condition warning earlier on this page.
await db.$transaction([
db.chat.update({
where: { id: chatId },
data: { messages: uiMessages },
}),
db.chatSession.upsert({
where: { id: chatId },
create: { id: chatId, runId, publicAccessToken: chatAccessToken, lastEventId },
update: { runId, publicAccessToken: chatAccessToken, lastEventId },
}),
]);
},
run: async ({ messages, signal }) => {
return streamText({
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