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Reactions

The agent can add and remove emoji reactions on messages using the message tool with the react action. Reaction behavior varies by channel.

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How it works

{
  "action": "react",
  "messageId": "msg-123",
  "emoji": "thumbsup"
}
  • emoji is required when adding a reaction.
  • Set emoji to an empty string ("") to remove the bot’s reaction(s).
  • Set remove: true to remove a specific emoji (requires non-empty emoji).

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Channel behavior

  • Empty emoji removes all of the bot’s reactions on the message.
  • remove: true removes just the specified emoji.
  • Empty emoji removes the app’s reactions on the message.
  • remove: true removes just the specified emoji.
  • Empty emoji removes the bot’s reactions.
  • remove: true also removes reactions but still requires a non-empty emoji for tool validation.
  • Empty emoji removes the bot reaction.
  • remove: true maps to empty emoji internally (still requires emoji in the tool call).
  • Requires non-empty emoji.
  • remove: true removes that specific emoji reaction.
  • Inbound reaction notifications emit system events when channels.signal.reactionNotifications is enabled.
  • Agent Send — the message tool that includes react
  • Channels — channel-specific configuration
Last modified on March 22, 2026