Add copy action for user messages in ChatKit embed (configurable)

[Vanalio]

Hi ChatKit team — we’re integrating the ChatKit embed (web component + @openai/chatkit-react) and ran into what looks like a gap in message actions.

Summary

• In the ChatKit embed UI, there’s a “copy/share message” affordance for assistant turns, but not for user messages.
• We’d like to enable a copy icon/action on user messages as well (preferably behind an explicit option).

Current behavior

• User messages (type: "user_message") do not show a copy action in the thread UI.
• Assistant messages do, and widgets can participate in copy via WidgetItem.copy_text (works as expected).
• Public options don’t appear to expose any “copy” toggle:
  • threadItemActions only includes feedback + retry.
  • Docs/API reference: https://openai.github.io/chatkit-js/api/openai/chatkit/type-aliases/threaditemactionsoption/

We also inspected the currently hosted ChatKit frame bundle and the clipboard text builder appears to only include assistant_message items (plus widgets when copy_text is present), and excludes user_message.

Repro (minimal)

1. Load the embed script: https://cdn.platform.openai.com/deployments/chatkit/chatkit.js
2. Mount <openai-chatkit> (or via @openai/chatkit-react) with a working backend.
3. Send a user message and wait for an assistant response.
4. Observe: assistant message has copy/share UI; user message does not.

Why it matters

• In many chat UIs, users frequently want to copy their own prompt (reuse, quote, edit elsewhere, share with support, etc.).
• In embed contexts, a “copy user message” action is especially useful because the host app often can’t easily augment per-message UI (cross-origin iframe).

Proposal (one possible API shape)

Option A: extend threadItemActions (keeps actions in one place)

threadItemActions: {
  feedback?: boolean;
  retry?: boolean;
  copy?: {
    enabled?: boolean;
    includeUserMessages?: boolean;        // default false for back-compat
    includeAssistantMessages?: boolean;   // default true (existing behavior)
  };
}

Option B: separate user message actions (more explicit)

userMessageActions?: {
  copy?: boolean;
}

Implementation notes (for your consideration)

• For user_message.content, copy could concatenate input_text + input_tag text into plain text.
• Attachments could be ignored, or appended as e.g. [attachment: filename].

Question

• Is the absence of a user-message copy action intentional? If so, can the docs explicitly call it out?
• If not intentional, we’d love to see a supported way to enable copy for user messages.

Thanks!

[Vanalio]

Extra detail: in the currently-hosted ChatKit frame bundle at https://cdn.platform.openai.com/assets/ck1/index-DLCvBfo-.js, the function getTextClipboardContent filters turn items using s?.type==="assistant_message" || (s?.type==="widget" && !!s.copy_text) (no user_message). That seems to be the source of the missing copy/share affordance for user messages.

[Vanalio]

Clarification on UI: in the thread, the assistant message bubble/turn shows the copy/share affordance (icon) today, but the user message bubble does not show an equivalent copy action. The ask here is specifically to surface a copy action on user bubbles/turns as well (ideally opt-in).