diff --git a/plugin/web/input-filter.ts b/plugin/web/input-filter.ts
index a84503e..af42b02 100644
--- a/plugin/web/input-filter.ts
+++ b/plugin/web/input-filter.ts
@@ -16,7 +16,22 @@ function stripOpenClawTimestampPrefix(raw: string): string {
 }
 
 /**
- * Extract the latest user message from the OpenClaw request.
+ * Marker that prefixes the body of every OpenClaw runtime-context block.
+ * OpenClaw emits these as a separate `custom_message` in its session log; the
+ * OpenAI-completions adapter folds them into the request as an extra
+ * `role=user` message immediately after the actual user input. The bridge must
+ * skip them when picking the prompt to forward, otherwise Claude sees only the
+ * metadata envelope and reports the message as "empty".
+ */
+const RUNTIME_CONTEXT_MARKER =
+  "OpenClaw runtime context for the immediately preceding user message";
+
+function isRuntimeContextMessage(text: string): boolean {
+  return text.trimStart().startsWith(RUNTIME_CONTEXT_MARKER);
+}
+
+/**
+ * Extract the latest user-authored message from the OpenClaw request.
  *
  * OpenClaw accumulates all user messages and sends the full array every turn,
  * but assistant messages may be missing if the previous response wasn't streamed
@@ -26,15 +41,22 @@ function stripOpenClawTimestampPrefix(raw: string): string {
  * OpenClaw prefixes user messages with a timestamp: "[Day YYYY-MM-DD HH:MM TZ] text"
  * We strip the timestamp prefix before forwarding.
  *
- * Returns "" if no user messages exist or the latest user message is empty
- * (e.g. a bare /new turn — see also extractRequestContext.bareSessionReset).
+ * OpenClaw also emits a runtime-context envelope as an extra `role=user`
+ * message after each real user message (chat_id, sender, etc.). We skip those
+ * when scanning for the prompt — see RUNTIME_CONTEXT_MARKER.
+ *
+ * Returns "" if no user-authored messages exist (e.g. a bare /new turn — see
+ * also extractRequestContext.bareSessionReset).
  */
 export function extractLatestUserMessage(req: BridgeInboundRequest): string {
   const userMessages = req.messages.filter((m) => m.role === "user");
-  if (userMessages.length === 0) return "";
-
-  const raw = messageText(userMessages[userMessages.length - 1]);
-  return stripOpenClawTimestampPrefix(raw);
+  for (let i = userMessages.length - 1; i >= 0; i -= 1) {
+    const raw = messageText(userMessages[i]);
+    if (!raw) continue;
+    if (isRuntimeContextMessage(raw)) continue;
+    return stripOpenClawTimestampPrefix(raw);
+  }
+  return "";
 }
 
 export type RequestContext = {