diff --git a/packages/server/shared-handlers.test.ts b/packages/server/shared-handlers.test.ts
index d12fd03e..2856c46e 100644
--- a/packages/server/shared-handlers.test.ts
+++ b/packages/server/shared-handlers.test.ts
@@ -2,7 +2,12 @@ import { describe, expect, test } from "bun:test";
 import { mkdtempSync, readFileSync, rmSync } from "node:fs";
 import { join } from "node:path";
 import { tmpdir } from "node:os";
-import { handleSaveNotes, handleServerReady, writeServerReadyMetadata } from "./shared-handlers";
+import {
+  handleSaveNotes,
+  handleServerReady,
+  isCodexDesktopHost,
+  writeServerReadyMetadata,
+} from "./shared-handlers";
 
 function saveNotesRequest(body: unknown): Request {
   return new Request("http://localhost/api/save-notes", {
@@ -104,15 +109,30 @@ describe("writeServerReadyMetadata", () => {
 });
 
 describe("handleServerReady", () => {
+  test("detects the Codex Desktop app host", () => {
+    expect(isCodexDesktopHost({ __CFBundleIdentifier: "com.openai.codex" })).toBe(true);
+    expect(isCodexDesktopHost({ __CFBundleIdentifier: "com.apple.Terminal" })).toBe(false);
+  });
+
   test("does not open a browser when host-plugin mode handles it", async () => {
     let opened = false;
+    const originalBundleIdentifier = process.env.__CFBundleIdentifier;
+    process.env.__CFBundleIdentifier = "com.apple.Terminal";
 
-    await handleServerReady("http://localhost:12345", false, 12345, {
-      skipBrowserOpen: true,
-      openBrowser: async () => {
-        opened = true;
-      },
-    });
+    try {
+      await handleServerReady("http://localhost:12345", false, 12345, {
+        skipBrowserOpen: true,
+        openBrowser: async () => {
+          opened = true;
+        },
+      });
+    } finally {
+      if (originalBundleIdentifier === undefined) {
+        delete process.env.__CFBundleIdentifier;
+      } else {
+        process.env.__CFBundleIdentifier = originalBundleIdentifier;
+      }
+    }
 
     expect(opened).toBe(false);
   });
@@ -141,10 +161,12 @@ describe("handleServerReady", () => {
     const writes: string[] = [];
     let opened = "";
     const original = process.stderr.write.bind(process.stderr);
+    const originalBundleIdentifier = process.env.__CFBundleIdentifier;
     (process.stderr as { write: unknown }).write = (chunk: unknown) => {
       writes.push(String(chunk));
       return true;
     };
+    process.env.__CFBundleIdentifier = "com.apple.Terminal";
     try {
       await handleServerReady("http://localhost:3000", false, 3000, {
         openBrowser: async (u: string) => {
@@ -154,11 +176,40 @@ describe("handleServerReady", () => {
       });
     } finally {
       (process.stderr as { write: unknown }).write = original;
+      if (originalBundleIdentifier === undefined) {
+        delete process.env.__CFBundleIdentifier;
+      } else {
+        process.env.__CFBundleIdentifier = originalBundleIdentifier;
+      }
     }
     expect(writes.join("")).not.toContain("http://localhost:3000");
     expect(opened).toBe("http://localhost:3000");
   });
 
+  test("prints the URL for a local Codex Desktop session even when the browser opens", async () => {
+    const writes: string[] = [];
+    const originalWrite = process.stderr.write.bind(process.stderr);
+    const originalBundleIdentifier = process.env.__CFBundleIdentifier;
+    (process.stderr as { write: unknown }).write = (chunk: unknown) => {
+      writes.push(String(chunk));
+      return true;
+    };
+    process.env.__CFBundleIdentifier = "com.openai.codex";
+    try {
+      await handleServerReady("http://localhost:3000", false, 3000, {
+        openBrowser: async () => true,
+      });
+    } finally {
+      (process.stderr as { write: unknown }).write = originalWrite;
+      if (originalBundleIdentifier === undefined) {
+        delete process.env.__CFBundleIdentifier;
+      } else {
+        process.env.__CFBundleIdentifier = originalBundleIdentifier;
+      }
+    }
+    expect(writes.join("")).toContain("http://localhost:3000");
+  });
+
   // Regression: a local session whose browser can't be opened (headless box,
   // devcontainer with no display) must still surface the URL, or the agent
   // hangs at waitForDecision with the user having no link to visit.
diff --git a/packages/server/shared-handlers.ts b/packages/server/shared-handlers.ts
index dec45cce..e6e7c333 100644
--- a/packages/server/shared-handlers.ts
+++ b/packages/server/shared-handlers.ts
@@ -177,6 +177,10 @@ export function writeServerReadyMetadata(readyFile: string, metadata: ServerRead
   appendFileSync(readyFile, `${JSON.stringify(metadata)}\n`, "utf8");
 }
 
+export function isCodexDesktopHost(env: NodeJS.ProcessEnv = process.env): boolean {
+  return env.__CFBundleIdentifier === "com.openai.codex";
+}
+
 /** Attempt to open the browser for the session URL. */
 export async function handleServerReady(
   url: string,
@@ -203,6 +207,8 @@ export async function handleServerReady(
     process.stderr.write(
       `\n  Plannotator session ready — open on your local machine (forward port ${port} if needed):\n  ${url}\n\n`,
     );
+  } else if (isCodexDesktopHost()) {
+    process.stderr.write(`\n  Plannotator session ready:\n  ${url}\n\n`);
   }
 
   const skipBrowserOpen = options.skipBrowserOpen ?? process.env.PLANNOTATOR_SKIP_BROWSER_OPEN === "1";