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74 lines
2.5 KiB
Markdown
74 lines
2.5 KiB
Markdown
---
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summary: "Reaction tool semantics across all supported channels"
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read_when:
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- Working on reactions in any channel
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- Understanding how emoji reactions differ across platforms
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title: "Reactions"
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---
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# Reactions
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The agent can add and remove emoji reactions on messages using the `message`
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tool with the `react` action. Reaction behavior varies by channel.
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## How it works
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```json
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{
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"action": "react",
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"messageId": "msg-123",
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"emoji": "thumbsup"
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}
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```
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- `emoji` is required when adding a reaction.
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- Set `emoji` to an empty string (`""`) to remove the bot's reaction(s).
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- Set `remove: true` to remove a specific emoji (requires non-empty `emoji`).
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## Channel behavior
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<AccordionGroup>
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<Accordion title="Discord and Slack">
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- Empty `emoji` removes all of the bot's reactions on the message.
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- `remove: true` removes just the specified emoji.
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</Accordion>
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<Accordion title="Google Chat">
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- Empty `emoji` removes the app's reactions on the message.
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- `remove: true` removes just the specified emoji.
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</Accordion>
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<Accordion title="Telegram">
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- Empty `emoji` removes the bot's reactions.
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- `remove: true` also removes reactions but still requires a non-empty `emoji` for tool validation.
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</Accordion>
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<Accordion title="WhatsApp">
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- Empty `emoji` removes the bot reaction.
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- `remove: true` maps to empty emoji internally (still requires `emoji` in the tool call).
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</Accordion>
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<Accordion title="Zalo Personal (zalouser)">
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- Requires non-empty `emoji`.
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- `remove: true` removes that specific emoji reaction.
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</Accordion>
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<Accordion title="Signal">
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- 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.
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</Accordion>
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</AccordionGroup>
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## Reaction level
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Per-channel `reactionLevel` config controls how broadly the agent uses reactions. Values are typically `off`, `ack`, `minimal`, or `extensive`.
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- [Telegram reactionLevel](/channels/telegram#reaction-notifications) — `channels.telegram.reactionLevel`
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- [WhatsApp reactionLevel](/channels/whatsapp#reactions) — `channels.whatsapp.reactionLevel`
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Set `reactionLevel` on individual channels to tune how actively the agent reacts to messages on each platform.
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## Related
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- [Agent Send](/tools/agent-send) — the `message` tool that includes `react`
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- [Channels](/channels) — channel-specific configuration
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