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openclaw/docs/tools/reactions.md

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---
summary: "Reaction tool semantics across all supported channels"
read_when:
- Working on reactions in any channel
- Understanding how emoji reactions differ across platforms
title: "Reactions"
---
# Reactions
The agent can add and remove emoji reactions on messages using the `message`
tool with the `react` action. Reaction behavior varies by channel.
## How it works
```json
{
"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`).
## Channel behavior
<AccordionGroup>
<Accordion title="Discord and Slack">
- Empty `emoji` removes all of the bot's reactions on the message.
- `remove: true` removes just the specified emoji.
</Accordion>
<Accordion title="Google Chat">
- Empty `emoji` removes the app's reactions on the message.
- `remove: true` removes just the specified emoji.
</Accordion>
<Accordion title="Telegram">
- Empty `emoji` removes the bot's reactions.
- `remove: true` also removes reactions but still requires a non-empty `emoji` for tool validation.
</Accordion>
<Accordion title="WhatsApp">
- Empty `emoji` removes the bot reaction.
- `remove: true` maps to empty emoji internally (still requires `emoji` in the tool call).
</Accordion>
<Accordion title="Zalo Personal (zalouser)">
- Requires non-empty `emoji`.
- `remove: true` removes that specific emoji reaction.
</Accordion>
<Accordion title="Signal">
- Inbound reaction notifications are controlled by `channels.signal.reactionNotifications`: `"off"` disables them, `"own"` (default) emits events when users react to bot messages, and `"all"` emits events for all reactions.
</Accordion>
</AccordionGroup>
## Related
- [Agent Send](/tools/agent-send) — the `message` tool that includes `react`
- [Channels](/channels) — channel-specific configuration