diff --git a/.agents/skills/test-t3-mobile/SKILL.md b/.agents/skills/test-t3-mobile/SKILL.md
index 1222449cd8a60d4dc9d3b837899d626813156b35..b2f5443e431a13c056c1d8305be2a149b462ded0 100644
--- a/.agents/skills/test-t3-mobile/SKILL.md
+++ b/.agents/skills/test-t3-mobile/SKILL.md
@@ -41,6 +41,9 @@ Start `vp run dev:client` from `apps/mobile`, or reuse a healthy Metro belonging
 to this checkout. Open its printed development-client URL with AgentDevice
 `open com.t3tools.t3code.dev <url>` and all returned target arguments.
 The device must be able to reach both Metro and the isolated backend.
+Append `&disableAutoLaunch=1&disableFab=1` to the development-client URL query
+when developer chrome would obscure screenshots or taps; the SDK 58 dev client
+applies these preferences before the app loads.
 
 ## Pair and verify
 
diff --git a/scripts/mobile-showcase.ts b/scripts/mobile-showcase.ts
index 2b141e12164f17cdea99f3b2eac40dc3cd6f3d97..772ab38963503bfd1e4279ca2b07ac95daba4837 100644
--- a/scripts/mobile-showcase.ts
+++ b/scripts/mobile-showcase.ts
@@ -34,6 +34,9 @@ const REPO_ROOT = NodePath.resolve(NodePath.dirname(NodeURL.fileURLToPath(import
 const MOBILE_ROOT = NodePath.join(REPO_ROOT, "apps/mobile");
 const ANDROID_PACKAGE = "com.t3tools.t3code";
 const APP_SCHEME = "t3code";
+// expo-dev-launcher reads these off the manifest URL and updates the dev menu
+// preferences before the app loads, keeping captures free of dev chrome.
+const DEV_CLIENT_LAUNCH_FLAGS = "disableOnboarding=1&disableFab=1&disableAutoLaunch=1";
 const IOS_READY_FILENAME = "T3ShowcaseReadyScene";
 const SERVER_HOST = "0.0.0.0";
 const IOS_SIMULATOR_ARCH = NodeProcess.arch === "arm64" ? "arm64" : "x86_64";
@@ -1107,25 +1110,9 @@ async function captureIos(
     await runCommand("xcrun", ["simctl", "install", simulator.udid, appPath]);
   }
 
-  for (const [key, value] of [
-    ["EXDevMenuIsOnboardingFinished", "true"],
-    ["EXDevMenuShowFloatingActionButton", "false"],
-    ["EXDevMenuShowsAtLaunch", "false"],
-  ] as const) {
-    await runCommand("xcrun", [
-      "simctl",
-      "spawn",
-      simulator.udid,
-      "defaults",
-      "write",
-      ANDROID_PACKAGE,
-      key,
-      "-bool",
-      value,
-    ]);
-  }
-
-  const metroUrl = `http://${metroHost}:${config.metroPort}?disableOnboarding=1`;
+  // The dev-client launch URL carries the dev menu preferences (SDK 58), so
+  // nothing is written into the app container ahead of launch.
+  const metroUrl = `http://${metroHost}:${config.metroPort}?${DEV_CLIENT_LAUNCH_FLAGS}`;
   const scenePath = NodePath.join(
     await iosAppContainer(simulator.udid),
     "Library/Caches/T3ShowcaseScene",
@@ -1357,12 +1344,12 @@ async function writeAndroidShowcaseScene(serial: string, scene: ShowcaseScene):
   ]);
 }
 
+// Gesture and key-command toggles have no launch-URL flag, so they still go
+// through the preferences file; onboarding, auto-launch and the floating button
+// come from DEV_CLIENT_LAUNCH_FLAGS on the launch URL.
 async function prepareAndroidShowcaseApp(serial: string): Promise<void> {
   const preferences = `<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <map>
-  <boolean name="isOnboardingFinished" value="true" />
-  <boolean name="showsAtLaunch" value="false" />
-  <boolean name="showFab" value="false" />
   <boolean name="motionGestureEnabled" value="false" />
   <boolean name="touchGestureEnabled" value="false" />
   <boolean name="keyCommandsEnabled" value="false" />
@@ -1435,7 +1422,7 @@ async function captureAndroid(
     "-a",
     "android.intent.action.VIEW",
     "-d",
-    `${APP_SCHEME}://expo-development-client/?url=${metroUrl}`,
+    `'${APP_SCHEME}://expo-development-client/?url=${metroUrl}&${DEV_CLIENT_LAUNCH_FLAGS}'`,
     "--es",
     "showcasePairingUrl",
     encodeAndroidPairingUrls(pairingUrls),