fix(cli): tell user when default port is busy and suggest alternative

In interactive mode: "Port 3000 is busy — suggesting 3001 instead.
Press Enter to accept, or type a different port."

In auto mode: "Port 3000 is busy — using 3001 instead."

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/cli/__tests__/commands/init.test.ts

@@ -87,6 +87,34 @@ describe("init command", () => {
     }
   });
 
+  it("auto mode tells user when default port is busy and which port it picked", async () => {
+    tmpDir = mkdtempSync(join(tmpdir(), "ao-init-test-"));
+    const outputPath = join(tmpDir, "agent-orchestrator.yaml");
+
+    // Occupy port 3000
+    const blocker = createServer();
+    await new Promise<void>((resolve) => {
+      blocker.listen(3000, "127.0.0.1", () => resolve());
+    });
+
+    try {
+      const logSpy = vi.spyOn(console, "log").mockImplementation(() => {});
+
+      const program = new Command();
+      program.exitOverride();
+      registerInit(program);
+
+      await program.parseAsync(["node", "test", "init", "--auto", "--output", outputPath]);
+
+      const logCalls = logSpy.mock.calls.map((args) => args.join(" "));
+      const busyMessage = logCalls.find((msg) => msg.includes("Port 3000 is busy"));
+      expect(busyMessage).toBeDefined();
+      expect(busyMessage).toContain("instead");
+    } finally {
+      await new Promise<void>((resolve) => blocker.close(() => resolve()));
+    }
+  });
+
   it("auto mode writes name and sessionPrefix to project config", async () => {
     tmpDir = mkdtempSync(join(tmpdir(), "ao-init-test-"));
     const outputPath = join(tmpDir, "agent-orchestrator.yaml");

packages/cli/src/commands/init.ts

@@ -252,6 +252,11 @@ export function registerInit(program: Command): void {
             ),
           );
           console.log(chalk.dim("  Please specify a port manually.\n"));
+        } else if (freePort !== DEFAULT_PORT) {
+          console.log(
+            chalk.yellow(`\n⚠ Port ${DEFAULT_PORT} is busy — suggesting ${freePort} instead.`),
+          );
+          console.log(chalk.dim("  Press Enter to accept, or type a different port.\n"));
         }
         const portStr = await prompt(rl, "Dashboard port", String(freePort ?? DEFAULT_PORT));
         const port = parseInt(portStr, 10);
@@ -462,6 +467,8 @@ async function handleAutoMode(outputPath: string, smart: boolean): Promise<void>
       ),
     );
     console.log(chalk.dim("    Set the port manually in the config before running ao start.\n"));
+  } else if (port !== DEFAULT_PORT) {
+    console.log(chalk.yellow(`  ⚠ Port ${DEFAULT_PORT} is busy — using ${port} instead.`));
   }
   const config: Record<string, unknown> = {
     dataDir: "~/.agent-orchestrator",