feat(messages): also derive responsePrefix from identity.name

When identity.name is configured and responsePrefix is not explicitly set,
automatically default responsePrefix to [identity.name].

This means users only need to set their identity once:
  { identity: { name: "MyBot" } }

And outbound messages will automatically be prefixed with [MyBot].

src/config/types.ts

@@ -891,8 +891,8 @@ export type AudioConfig = {
 };
 
 export type MessagesConfig = {
-  messagePrefix?: string; // Prefix added to all inbound messages (default: "[{identity.name}]" or "[clawdbot]" if no allowFrom, else "")
-  responsePrefix?: string; // Prefix auto-added to all outbound replies (e.g., "🦞")
+  messagePrefix?: string; // Prefix added to all inbound messages (default: "[{agents.list[].identity.name}]" or "[clawdbot]" if no allowFrom, else "")
+  responsePrefix?: string; // Prefix auto-added to all outbound replies (default: "[{agents.list[].identity.name}]" when set, else none)
   groupChat?: GroupChatConfig;
   queue?: QueueConfig;
   /** Emoji reaction used to acknowledge inbound messages (empty disables). */

src/web/auto-reply.test.ts

@@ -2000,4 +2000,43 @@ describe("web auto-reply", () => {
     expect(resolverArg.Body).not.toContain("[clawdbot]");
     resetLoadConfigMock();
   });
+
+  it("uses identity.name for responsePrefix when set", async () => {
+    setLoadConfigMock(() => ({
+      identity: { name: "Richbot", emoji: "🦁" },
+      whatsapp: { allowFrom: ["*"] },
+    }));
+
+    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 monitorWebProvider(false, listenerFactory, false, resolver);
+    expect(capturedOnMessage).toBeDefined();
+
+    await capturedOnMessage?.({
+      body: "hi",
+      from: "+1555",
+      to: "+2666",
+      id: "msg1",
+      sendComposing: vi.fn(),
+      reply,
+      sendMedia: vi.fn(),
+    });
+
+    // Reply should have identity-based responsePrefix prepended
+    expect(reply).toHaveBeenCalledWith("[Richbot] hello there");
+    resetLoadConfigMock();
+  });
 });

src/web/auto-reply.ts

@@ -1170,9 +1170,15 @@ export async function monitorWebProvider(
       const textLimit = resolveTextChunkLimit(cfg, "whatsapp");
       let didLogHeartbeatStrip = false;
       let didSendReply = false;
+      // Derive responsePrefix from identity.name if not explicitly set
+      const responsePrefix =
+        cfg.messages?.responsePrefix ??
+        (cfg.identity?.name?.trim()
+          ? `[${cfg.identity.name.trim()}]`
+          : undefined);
       const { dispatcher, replyOptions, markDispatchIdle } =
         createReplyDispatcherWithTyping({
-          responsePrefix: cfg.messages?.responsePrefix,
+          responsePrefix,
           onHeartbeatStrip: () => {
             if (!didLogHeartbeatStrip) {
               didLogHeartbeatStrip = true;