injectSendFollowUpMessage

injectSendFollowUpMessage(): SendFollowUpMessageFn

type SendFollowUpMessageFn = (
  prompt: string,
  options?: SendFollowUpMessageOptions,
) => Promise<void>;

import { injectSendFollowUpMessage } from "ng-mcp-ui/web";

export class PollWidget {
  private readonly sendFollowUp = injectSendFollowUpMessage();

  explain(option: string) {
    this.sendFollowUp(`Why did most people choose ${option}?`);
  }
}

The message enters the conversation as a user turn. The model answers it.

Options

Option	Type	Effect
scrollToBottom	boolean, optional	Asks the host to scroll to the new turn.

When to use it

Use it to move work back to the model.

• Correct: a button that asks the model to explain the result on screen.
• Correct: a control that asks for a different analysis of the same data.
• Not correct: a data operation of your own. Call a tool with injectCallTool instead, because it keeps the result in the view.

A follow-up message costs a model turn. A tool call does not.

Write the prompt for the model

The model reads the string, not your intent. Name the subject.

this.sendFollowUp("Why did most people choose the second option?");   // clear
this.sendFollowUp("Explain this.");                                    // unclear

To give the model the state on screen without a message, use the [dataLlm] directive instead.

Host support

Host	Behavior
Apps SDK	Supported. scrollToBottom is honored.
MCP Apps	Supported. scrollToBottom is ignored.

Related

• injectCallTool
• DataLlmDirective