fix: scope whatsapp self-chat response prefix

src/web/auto-reply.web-auto-reply.prefixes-body-same-phone-marker-from.test.ts

@@ -258,6 +258,55 @@ describe("web auto-reply", () => {
     expect(reply).toHaveBeenCalledWith("🦞 hello there");
     resetLoadConfigMock();
   });
+  it("defaults responsePrefix for self-chat replies when unset", async () => {
+    setLoadConfigMock(() => ({
+      agents: {
+        list: [
+          {
+            id: "main",
+            default: true,
+            identity: { name: "Mainbot", emoji: "🦞", theme: "space lobster" },
+          },
+        ],
+      },
+      channels: { whatsapp: { allowFrom: ["+1555"] } },
+      messages: {
+        messagePrefix: undefined,
+        responsePrefix: undefined,
+      },
+    }));
+
+    let capturedOnMessage:
+      | ((msg: import("./inbound.js").WebInboundMessage) => Promise<void>)
+      | undefined;
+    const reply = vi.fn();
+    const listenerFactory = async (opts: {
+      onMessage: (msg: import("./inbound.js").WebInboundMessage) => Promise<void>;
+    }) => {
+      capturedOnMessage = opts.onMessage;
+      return { close: vi.fn() };
+    };
+
+    const resolver = vi.fn().mockResolvedValue({ text: "hello there" });
+
+    await monitorWebChannel(false, listenerFactory, false, resolver);
+    expect(capturedOnMessage).toBeDefined();
+
+    await capturedOnMessage?.({
+      body: "hi",
+      from: "+1555",
+      to: "+1555",
+      selfE164: "+1555",
+      chatType: "direct",
+      id: "msg1",
+      sendComposing: vi.fn(),
+      reply,
+      sendMedia: vi.fn(),
+    });
+
+    expect(reply).toHaveBeenCalledWith("[Mainbot] hello there");
+    resetLoadConfigMock();
+  });
   it("does not deliver HEARTBEAT_OK responses", async () => {
     setLoadConfigMock(() => ({
       channels: { whatsapp: { allowFrom: ["*"] } },

src/web/auto-reply/monitor/process-message.ts

@@ -1,4 +1,8 @@
-import { resolveEffectiveMessagesConfig, resolveIdentityName } from "../../../agents/identity.js";
+import {
+  resolveEffectiveMessagesConfig,
+  resolveIdentityName,
+  resolveIdentityNamePrefix,
+} from "../../../agents/identity.js";
 import {
   extractShortModelName,
   type ResponsePrefixContext,
@@ -172,10 +176,17 @@ export async function processMessage(params: {
   const textLimit = params.maxMediaTextChunkLimit ?? resolveTextChunkLimit(params.cfg, "whatsapp");
   let didLogHeartbeatStrip = false;
   let didSendReply = false;
-  const responsePrefix = resolveEffectiveMessagesConfig(
-    params.cfg,
-    params.route.agentId,
-  ).responsePrefix;
+  const configuredResponsePrefix = params.cfg.messages?.responsePrefix;
+  const resolvedMessages = resolveEffectiveMessagesConfig(params.cfg, params.route.agentId);
+  const isSelfChat =
+    params.msg.chatType !== "group" &&
+    Boolean(params.msg.selfE164) &&
+    normalizeE164(params.msg.from) === normalizeE164(params.msg.selfE164 ?? "");
+  const responsePrefix =
+    resolvedMessages.responsePrefix ??
+    (configuredResponsePrefix === undefined && isSelfChat
+      ? resolveIdentityNamePrefix(params.cfg, params.route.agentId) ?? "[clawdbot]"
+      : undefined);
 
   // Create mutable context for response prefix template interpolation
   let prefixContext: ResponsePrefixContext = {