{
  "description": "React to a message with a single emoji, the way you'd tapback in iMessage. Reach for it when a reaction is what a person would do: something funny gets a 😂, warmth gets a ❤️, a plan you're on board with gets a 👍 — then just carry on with whatever the message actually needs. If a reaction says it all, it can BE the reply (skip the redundant 'sounds good!' turn). Use it like a person would: occasionally, when felt — not on every message, and never as a status signal. NEVER narrate or explain a reaction ('I reacted with...', 'Reacting now') — the emoji appearing on the bubble is the whole point, and commentary kills it. Defaults to the user's most recent message. One reaction per message: a different emoji replaces yours, an empty string retracts it.",
  "name": "react_to_message",
  "parameters": {
    "properties": {
      "emoji": {
        "description": "The emoji to react with (e.g. '❤️', '😂', '👍'). Pass an empty string to remove your reaction.",
        "type": "string"
      },
      "message_row_id": {
        "description": "Optional. The specific message to react to. Omit to react to the user's latest message, which is almost always what you want.",
        "type": "integer"
      },
      "messages_back": {
        "description": "Optional. React to an EARLIER user message: 1 = the one before the latest, 2 = two before, and so on. For when something lands late — the joke you only got after answering.",
        "type": "integer"
      }
    },
    "required": [
      "emoji"
    ],
    "type": "object"
  }
}