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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="Feishu/Lark">
+    - Use the `feishu_reaction` tool with actions `add`, `remove`, and `list`.
+    - Add/remove requires `emoji_type`; remove also requires `reaction_id`.
+  </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>
+
+## Reaction level
+
+Per-channel `reactionLevel` config controls how broadly the agent uses reactions. Values are typically `off`, `ack`, `minimal`, or `extensive`.
+
+- [Telegram reactionLevel](/channels/telegram#reaction-notifications) — `channels.telegram.reactionLevel`
+- [WhatsApp reactionLevel](/channels/whatsapp#reaction-level) — `channels.whatsapp.reactionLevel`
+
+Set `reactionLevel` on individual channels to tune how actively the agent reacts to messages on each platform.
+
+## Related
+
+- [Agent Send](/tools/agent-send) — the `message` tool that includes `react`
+- [Channels](/channels) — channel-specific configuration