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