toTanStackMessages

toTanStackMessages(messages: Message<unknown>[], options?: ToTanStackMessagesOptions): Promise<TanStackMessage[]>

• Keeps messages that have no text but carry content (images, files, links). Only messages with no usable content at all are skipped.
• Maps author.isMe === true to "assistant", otherwise "user"
• Uses message.text for content
• Appends bounded link metadata inside an explicit untrusted-content fence
• Includes image attachments as base64 ImageParts
• Inlines text file attachments into the message text as [File: name (mime)] blocks, since TanStack AI has no file content part
• Uses fetchData() when available to include attachment data inline
• Warns on unsupported attachment types (video, audio)

import { chat } from "@tanstack/ai";

const result = await thread.adapter.fetchMessages(thread.id, { limit: 20 });
const stream = chat({
  adapter,
  systemPrompts: ["You are a helpful assistant."],
  messages: await toTanStackMessages(result.messages),
});

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Parameters

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Returns