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Documentation Index

Fetch the complete documentation index at: https://prefab.prefect.io/docs/llms.txt

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SendMessage puts words in the user’s mouth — when triggered, it sends a message to the conversation as if the user typed it. This is useful for creating quick-action buttons that trigger follow-up questions or commands. The message appears in the chat attributed to the user, which means the AI assistant will respond to it naturally.

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Quick Action Buttons

Build a row of follow-up actions that save the user from typing:

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Dynamic Messages with State

Combine with state interpolation to include UI context in the message:

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API Reference

SendMessage Parameters

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content
str
required
Message text to send to the conversation. Can be passed as a positional argument. Supports {{ key }} interpolation.

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Protocol Reference

SendMessage
{
  "action": "sendMessage",
  "content": "string (required)"
}
For the complete protocol schema, see SendMessage.