diff --git a/src/agents/cli-runner/prepare.test.ts b/src/agents/cli-runner/prepare.test.ts
index ae44b9cd297..650629a1c67 100644
--- a/src/agents/cli-runner/prepare.test.ts
+++ b/src/agents/cli-runner/prepare.test.ts
@@ -95,6 +95,7 @@ function createTestMcpLoopbackServerConfig(port: number) {
           "x-openclaw-account-id": "${OPENCLAW_MCP_ACCOUNT_ID}",
           "x-openclaw-message-channel": "${OPENCLAW_MCP_MESSAGE_CHANNEL}",
           "x-openclaw-inbound-event-kind": "${OPENCLAW_MCP_INBOUND_EVENT_KIND}",
+          "x-openclaw-source-reply-delivery-mode": "${OPENCLAW_MCP_SOURCE_REPLY_DELIVERY_MODE}",
         },
       },
     },
diff --git a/src/auto-reply/reply/prompt-prelude.ts b/src/auto-reply/reply/prompt-prelude.ts
index 5600e062409..7f8499e6e4d 100644
--- a/src/auto-reply/reply/prompt-prelude.ts
+++ b/src/auto-reply/reply/prompt-prelude.ts
@@ -10,7 +10,7 @@ import { appendUntrustedContext } from "./untrusted-context.js";
 const REPLY_MEDIA_HINT =
   "To send an image back, prefer the message tool (media/path/filePath). If you must inline, use MEDIA:https://example.com/image.jpg (spaces ok, quote if needed) or a safe relative path like MEDIA:./image.jpg. Absolute and ~ paths only work when they stay inside your allowed file-read boundary; host file:// URLs are blocked. Keep caption in the text body.";
 const ROOM_EVENT_PROMPT = "[OpenClaw room event]";
-const ROOM_EVENT_VISIBLE_REPLY_CONTRACT = "message_tool_only";
+const ROOM_EVENT_SOURCE_REPLY_DELIVERY_MODE = "message_tool_only";
 
 export function buildReplyPromptBodies(params: {
   ctx: MsgContext;
@@ -134,7 +134,7 @@ function buildRoomEventContext(params: ReplyPromptEnvelopeBaseParams): string {
   return [
     "[OpenClaw room event]",
     "inbound_event_kind: room_event",
-    `visible_reply_contract: ${ROOM_EVENT_VISIBLE_REPLY_CONTRACT}`,
+    `visible_reply_contract: ${ROOM_EVENT_SOURCE_REPLY_DELIVERY_MODE}`,
     params.inboundUserContext.trim() ? `Room context:\n${params.inboundUserContext.trim()}` : "",
     `Current event:\n${formatRoomEventLine(params.sessionCtx, roomEventBody)}`,
     "Treat this as observed room activity. Decide whether to act.",