feat: strip webchat envelope metadata from user messages (#10)

When OpenClaw's webchat relays user messages, it wraps them in metadata
(conversation info JSON block + UTC timestamp prefix). This strips the
envelope at render time so users see only their actual text.

- Add hasWebchatEnvelope() and stripWebchatEnvelope() to systemEvent.ts
- Chain webchat + webhook stripping via stripAll() helper in ChatMessage
- Fix 'webhook' label only appearing for actual webhook messages, not
  for envelope-stripped webchat messages

Co-authored-by: togotago <drewmfleury@gmail.com>

src/components/ChatMessage.tsx

@@ -14,7 +14,7 @@ import { copyToClipboard } from '../lib/clipboard';
 import { Bot, User, Wrench, Copy, Check, CheckCheck, RefreshCw, Zap, Info, Webhook, Braces, Clock, AlertCircle, Bookmark, ChevronDown, Reply } from 'lucide-react';
 import { t, getLocale } from '../lib/i18n';
 import { useLocale } from '../hooks/useLocale';
-import { stripWebhookScaffolding, hasWebhookScaffolding } from '../lib/systemEvent';
+import { stripWebhookScaffolding, hasWebhookScaffolding, hasWebchatEnvelope, stripWebchatEnvelope } from '../lib/systemEvent';
 // ChevronDown, ChevronRight, Wrench still used by InternalOnlyMessage
 
 /** Avatar image with fallback to Bot icon on load error */
@@ -454,26 +454,38 @@ export const ChatMessageComponent = memo(function ChatMessageComponent({ message
   const isLight = resolvedTheme === 'light';
   const [showRawJson, setShowRawJson] = useState(false);
 
-  // Strip webhook/hook scaffolding from user messages before rendering
+  // Strip webhook/hook scaffolding and webchat envelope from user messages before rendering
   const message = useMemo(() => {
     if (rawMessage.role !== 'user') return rawMessage;
     const content = rawMessage.content || '';
     const textBlocks = getTextBlocks(rawMessage.blocks);
-    const contentHasScaffolding = hasWebhookScaffolding(content);
-    const anyBlockHasScaffolding = textBlocks.some(b =>
-      hasWebhookScaffolding((b as Extract<MessageBlock, { type: 'text' }>).text)
-    );
-    if (!contentHasScaffolding && !anyBlockHasScaffolding) return rawMessage;
+
+    // Helper: apply all applicable strip functions to a string
+    const stripAll = (text: string): string => {
+      let result = text;
+      if (hasWebhookScaffolding(result)) result = stripWebhookScaffolding(result);
+      if (hasWebchatEnvelope(result)) result = stripWebchatEnvelope(result);
+      return result;
+    };
+
+    const contentNeedsStrip = hasWebhookScaffolding(content) || hasWebchatEnvelope(content);
+    const anyBlockNeedsStrip = textBlocks.some(b => {
+      const t = (b as Extract<MessageBlock, { type: 'text' }>).text;
+      return hasWebhookScaffolding(t) || hasWebchatEnvelope(t);
+    });
+
+    if (!contentNeedsStrip && !anyBlockNeedsStrip) return rawMessage;
+
     // Clean the content and blocks
     const cleaned: ChatMessageType = { ...rawMessage };
     if (cleaned.content) {
-      cleaned.content = stripWebhookScaffolding(cleaned.content);
+      cleaned.content = stripAll(cleaned.content);
     }
     if (cleaned.blocks.length > 0) {
       cleaned.blocks = cleaned.blocks.map(b => {
         if (b.type === 'text') {
           const tb = b as Extract<MessageBlock, { type: 'text' }>;
-          return { ...tb, text: stripWebhookScaffolding(tb.text) };
+          return { ...tb, text: stripAll(tb.text) };
         }
         return b;
       });
@@ -481,7 +493,7 @@ export const ChatMessageComponent = memo(function ChatMessageComponent({ message
     return cleaned;
   }, [rawMessage]);
 
-  const wasWebhookMessage = rawMessage !== message;
+  const wasWebhookMessage = rawMessage !== message && hasWebhookScaffolding(rawMessage.content || '');
 
   const isUser = message.role === 'user';
 

src/lib/systemEvent.ts

@@ -93,3 +93,45 @@ export function hasWebhookScaffolding(text: string): boolean {
   return /<<<EXTERNAL_UNTRUSTED_CONTENT>>>/.test(text) ||
     /---\s*SECURITY NOTICE\s*---/i.test(text);
 }
+
+/**
+ * Detect OpenClaw webchat envelope metadata in a user message.
+ *
+ * Pattern:
+ *   Conversation info (untrusted metadata):
+ *   ```json
+ *   { ... }
+ *   ```
+ *
+ *   [Wed 2026-02-18 14:06 UTC] actual message
+ */
+export function hasWebchatEnvelope(text: string): boolean {
+  return /Conversation info \(untrusted metadata\):/.test(text) ||
+    /^\[(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun) \d{4}-\d{2}-\d{2} \d{2}:\d{2} UTC\] /.test(text.trim());
+}
+
+/**
+ * Strip webchat envelope metadata from a user message, returning only the
+ * actual user text.
+ *
+ * Removes:
+ *  - "Conversation info (untrusted metadata):" header + trailing JSON code fence
+ *  - Timestamp prefix "[Wed 2026-02-18 14:06 UTC] "
+ */
+export function stripWebchatEnvelope(text: string): string {
+  let cleaned = text;
+
+  // Remove the "Conversation info (untrusted metadata):" block + JSON code fence
+  cleaned = cleaned.replace(
+    /Conversation info \(untrusted metadata\):\s*```json\s*[\s\S]*?```\s*/,
+    ''
+  );
+
+  // Strip timestamp prefix: [Wed 2026-02-18 14:06 UTC]
+  cleaned = cleaned.replace(
+    /^\[(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun) \d{4}-\d{2}-\d{2} \d{2}:\d{2} UTC\] /,
+    ''
+  );
+
+  return cleaned.trim() || text.trim();
+}