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summary: "Reaction semantics shared across channels"
read_when:
- Working on reactions in any channel
title: "Reactions"
---
# Reaction tooling
Shared reaction semantics across channels:
- `emoji` is required when adding a reaction.
- `emoji=""` removes the bot's reaction(s) when supported.
- `remove: true` removes the specified emoji when supported (requires `emoji`).
Channel notes:
- **Discord/Slack**: empty `emoji` removes all of the bot's reactions on the message; `remove: true` removes just that emoji.
- **Google Chat**: empty `emoji` removes the app's reactions on the message; `remove: true` removes just that emoji.
- **Telegram**: empty `emoji` removes the bot's reactions; `remove: true` also removes reactions but still requires a non-empty `emoji` for tool validation.
- **WhatsApp**: empty `emoji` removes the bot reaction; `remove: true` maps to empty emoji (still requires `emoji`).
- **Signal**: inbound reaction notifications emit system events when `channels.signal.reactionNotifications` is enabled.
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