Adding custom attributes to user input message in useChat AI SDK UI

[sahas-si]

In our application we have the below requirements

1. While asking a query in chatbot, a user can select few filters(Like company, sector etc).
2. User has a previous previous conversation history which includes user messages containing these filters & we have to render these messages

My query:
How can we render these filters along with the message content? I've seen that handleSubmit directly sets the user message with content. How to update the user message to add these filters? Which message attribute should be updated? Can we add custom attributes to the message?

handleSubmit logic updating the user message:

[lgrammel]

Would you mind filing an issue? this could be great enhancement

[tobiasbueschel]

Hi @sahas-si how did you end up implementing this? This reminds me a lot of Cursor's prompt input component which allows you to not only add files, but also other context such as a URLs, custom rules, result of a RAG call for a certain search, or enable certain tools such as as webSearch for a particular prompt.

@lgrammel is there already a recommended pattern for this in AI SDK v5? I considered the following before:

• FilePart: https://ai-sdk.dev/docs/reference/ai-sdk-core/model-message#filepart doesn't work for attachments that are not files such as a custom rule, a URL of a website that needs to be fetched, a tool that should be enabled for a given prompt, additional structured JSON context that isn't a file
• Custom data parts: one can enrich message.parts of a user message with e.g., data-context but any non text or file part is stripped out when convertToModelMessages() is being called
• Message Metadata: https://ai-sdk.dev/docs/ai-sdk-ui/message-metadata#common-use-cases (mainly recommended for timestamps, model information and so on + not send to the LLM as convertToModelMessages() doesn't send it)

I've also looked at prepareStep to e.g., call a custom tool like getContext(attachmentIds) and then have it fetch the context, however, then this context is stored in the assistant message and not in the user message, hence, when editing the user message you couldn't remove the attached e.g., rules, tools, URLs, etc. anymore.

Thanks

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