diff --git a/extensions/whatsapp/src/test-helpers.ts b/extensions/whatsapp/src/test-helpers.ts
index 5587cf9c4f2..3819d8c8f7b 100644
--- a/extensions/whatsapp/src/test-helpers.ts
+++ b/extensions/whatsapp/src/test-helpers.ts
@@ -252,6 +252,31 @@ function resolveSendableOutboundReplyPartsMock(payload: Record<string, unknown>)
   };
 }
 
+function resolveChannelSourceReplyDeliveryModeMock(params: {
+  cfg: {
+    messages?: {
+      visibleReplies?: "automatic" | "message_tool";
+      groupChat?: { visibleReplies?: "automatic" | "message_tool" };
+    };
+  };
+  ctx: { ChatType?: string; CommandSource?: "text" | "native" };
+  requested?: "automatic" | "message_tool_only";
+}) {
+  if (params.requested) {
+    return params.requested;
+  }
+  if (params.ctx.CommandSource === "native") {
+    return "automatic";
+  }
+  const chatType = normalizeLowercaseStringOrEmpty(params.ctx.ChatType);
+  if (chatType === "group" || chatType === "channel") {
+    return params.cfg.messages?.groupChat?.visibleReplies === "automatic"
+      ? "automatic"
+      : "message_tool_only";
+  }
+  return params.cfg.messages?.visibleReplies === "message_tool" ? "message_tool_only" : "automatic";
+}
+
 function toLocationContextMock(location: unknown) {
   return { Location: location };
 }
@@ -445,7 +470,7 @@ vi.mock("./auto-reply/monitor/inbound-dispatch.runtime.js", () => ({
   getAgentScopedMediaLocalRoots: () => [] as string[],
   jidToE164: normalizePhoneLikeToE164,
   logVerbose: (_msg: string) => undefined,
-  resolveChannelSourceReplyDeliveryMode: () => undefined,
+  resolveChannelSourceReplyDeliveryMode: resolveChannelSourceReplyDeliveryModeMock,
   resolveChunkMode: () => undefined,
   resolveIdentityNamePrefix: resolveIdentityNamePrefixMock,
   resolveInboundLastRouteSessionKey: (params: { sessionKey: string }) => params.sessionKey,
@@ -479,8 +504,8 @@ vi.mock("./auto-reply/monitor/runtime-api.js", () => ({
   normalizeE164: normalizePhoneLikeToE164,
   readStoreAllowFromForDmPolicy: async () => [] as string[],
   recordSessionMetaFromInbound: async () => undefined,
+  resolveChannelSourceReplyDeliveryMode: resolveChannelSourceReplyDeliveryModeMock,
   resolveChannelContextVisibilityMode: resolveChannelContextVisibilityModeMock,
-  resolveChannelSourceReplyDeliveryMode: () => undefined,
   resolveChunkMode: () => undefined,
   resolveIdentityNamePrefix: resolveIdentityNamePrefixMock,
   resolveInboundLastRouteSessionKey: (params: { sessionKey: string }) => params.sessionKey,