fix: keep acp typing for tool-only replies

docs/channels/group-messages.md

@@ -81,7 +81,7 @@ Only the owner number (from `channels.whatsapp.allowFrom`, or the bot’s own E.
 - Heartbeats are intentionally skipped for groups to avoid noisy broadcasts.
 - Echo suppression uses the combined batch string; if you send identical text twice without mentions, only the first will get a response.
 - Session store entries will appear as `agent:<agentId>:whatsapp:group:<jid>` in the session store (`~/.openclaw/agents/<agentId>/sessions/sessions.json` by default); a missing entry just means the group hasn’t triggered a run yet.
-- Typing indicators in groups follow `agents.defaults.typingMode` (default: `message` when unmentioned).
+- Typing indicators in groups follow `agents.defaults.typingMode`. When visible replies use the default message-tool-only mode, typing starts immediately by default so group members can see the agent is working even if no automatic final reply is posted. Explicit typing-mode config still wins.
 
 ## Related
 

docs/channels/groups.md

@@ -45,6 +45,8 @@ That means the agent still processes the turn and can update memory/session stat
 
 This replaces the old pattern of forcing the model to answer `NO_REPLY` for most lurk-mode turns. In tool-only mode, doing nothing visible simply means not calling the message tool.
 
+Typing indicators are still sent while the agent works in tool-only mode. The default group typing mode is upgraded from "message" to "instant" for these turns because there may never be normal assistant message text before the agent decides whether to call the message tool. Explicit typing-mode config still wins.
+
 To restore legacy automatic final replies for group/channel rooms:
 
 ```json5