feat(messages): add whatsapp messagePrefix and responsePrefix auto

docs/concepts/messages.md

@@ -77,7 +77,7 @@ Details: [Thinking + reasoning directives](/tools/thinking) and [Token use](/tok
 ## Prefixes, threading, and replies
 
 Outbound message formatting is centralized in `messages`:
-- `messages.responsePrefix` and `messages.messagePrefix`
+- `messages.responsePrefix` (outbound prefix) and `whatsapp.messagePrefix` (WhatsApp inbound prefix)
 - Reply threading via `replyToMode` and per-provider defaults
 
 Details: [Configuration](/gateway/configuration#messages) and provider docs.

docs/gateway/configuration.md

@@ -926,8 +926,7 @@ See [Messages](/concepts/messages) for queueing, sessions, and streaming context
 ```json5
 {
   messages: {
-    messagePrefix: "[clawdbot]",
-    responsePrefix: "🦞",
+    responsePrefix: "🦞", // or "auto"
     ackReaction: "👀",
     ackReactionScope: "group-mentions"
   }
@@ -938,11 +937,13 @@ See [Messages](/concepts/messages) for queueing, sessions, and streaming context
 streaming, final replies) across providers unless already present.
 
 If `messages.responsePrefix` is unset, no prefix is applied by default.
+Set it to `"auto"` to derive `[{identity.name}]` for the routed agent (when set).
 
-If `messages.messagePrefix` is unset, the default stays **unchanged**:
-`"[clawdbot]"` when `whatsapp.allowFrom` is empty, otherwise `""` (no prefix).
-When using `"[clawdbot]"`, Clawdbot will instead use `[{identity.name}]` when
-the routed agent has `identity.name` set.
+WhatsApp inbound prefix is configured via `whatsapp.messagePrefix` (deprecated:
+`messages.messagePrefix`). Default stays **unchanged**: `"[clawdbot]"` when
+`whatsapp.allowFrom` is empty, otherwise `""` (no prefix). When using
+`"[clawdbot]"`, Clawdbot will instead use `[{identity.name}]` when the routed
+agent has `identity.name` set.
 
 `ackReaction` sends a best-effort emoji reaction to acknowledge inbound messages
 on providers that support reactions (Slack/Discord/Telegram). Defaults to the

docs/providers/whatsapp.md

@@ -197,7 +197,7 @@ Behavior:
 - `whatsapp.actions.reactions` (gate WhatsApp tool reactions).
 - `agents.list[].groupChat.mentionPatterns` (or `messages.groupChat.mentionPatterns`)
 - `messages.groupChat.historyLimit`
-- `messages.messagePrefix` (inbound prefix)
+- `whatsapp.messagePrefix` (inbound prefix; per-account: `whatsapp.accounts.<accountId>.messagePrefix`; deprecated: `messages.messagePrefix`)
 - `messages.responsePrefix` (outbound prefix)
 - `agents.defaults.mediaMaxMb`
 - `agents.defaults.heartbeat.every`