Test T3 Mobile

Run one focused, end-to-end mobile verification pass against disposable T3 state. Use the sibling test-t3-app skill as the detailed reference for pairing-token semantics and SQLite fixtures.

Command examples use POSIX shell syntax. On Windows, use PowerShell equivalents: set variables with $env:NAME = "value", use an explicit temporary directory from [System.IO.Path]::GetTempPath(), and run multiline examples on one line or with PowerShell backticks. Use $env:ANDROID_HOME\platform-tools\adb.exe when adb is not already on PATH.

Select a viable platform

Inspect the host and the affected code before launching processes:

• On macOS with Xcode, prefer one representative iOS Simulator when the change is cross-platform so the user can watch through serve-sim. Load and follow ios-debugger-agent, and load ios-simulator-browser when live streaming is available.
• On macOS, Linux, or Windows with the Android SDK, use one Android Emulator when Android is the affected surface or iOS tooling is unavailable.
• When the change is platform-specific, test that platform. When neither platform is viable, report the missing SDK or emulator prerequisite rather than claiming verification. A missing development client is a build step, not a blocker.

Do not treat unavailable iOS tooling as a blocker when Android is a valid representative target.

Ensure a compatible native client

Authorized mobile verification includes building and installing a development client. A missing, stale, or unknown native client is not a reason to skip verification or leave a PR in draft. Build and install it, then continue. Respect an explicit user instruction not to rebuild; otherwise do not ask for separate permission.

Run this from the checkout being tested, on the machine that hosts the selected simulator or emulator. Select and boot one explicit iOS UDID or Android emulator serial first:

node scripts/mobile-native-client.ts ensure ios <simulator-udid>
node scripts/mobile-native-client.ts ensure android <emulator-serial>

ensure compares the checkout's local Expo development fingerprint and the installed app's binary contents against the last successful build record. It reuses a matching client; otherwise it runs a clean prebuild, builds and installs the development app, and records the successful result. It does not start Metro. Start Metro below after it succeeds. On hosts with an agent-job requirement, run the entire ensure command through that queue.

For a read-only decision, use check in place of ensure. Exit 0 means compatible, 2 means build required, and 1 means an operational error. An app installed outside this helper is initially unknown and gets rebuilt once. Records are local to the simulator host under ~/.cache/t3code/native-clients and work across checkouts. Do not copy records between machines or write them manually.

A JavaScript-only diff, bundle identifier, app version, or recent install date does not prove native compatibility. Always check the whole checkout. Expo fingerprints are computed locally with APP_VARIANT=development; no EAS credentials or cloud build are required. Generated ios/ and android/ directories are excluded by .fingerprintignore, so edit native source modules or config plugins rather than generated output.

The development identity is T3 Code Dev, bundle/package com.t3tools.t3code.dev, scheme t3code-dev. If a build fails, investigate the build error and fix the local prerequisites. Report the concrete failure if it cannot be resolved, not “no compatible client.”

Start one disposable T3 environment

Run backend commands from the repository root. Use the ignored, worktree-local .t3 directory or create a fresh directory with the host OS's temporary-directory mechanism. An explicit base directory stores state in <base-dir>/userdata; never point testing at shared ~/.t3 state.

Seed a small number of meaningful Git projects before starting the backend:

node apps/server/src/bin.ts project add <git-workspace> \
  --base-dir <base-dir> \
  --title <project-title>

Running project add before the backend starts gives it exclusive offline database access. If a backend is already running, wait until it is ready so the CLI dispatches through the live server; never run offline mutations concurrently with the server.

Use direct SQLite mutation only for disposable projection fixtures. Follow test-t3-app and stop the backend before writing.

Start a headless backend after seeding:

node apps/server/src/bin.ts serve \
  --host 127.0.0.1 \
  --port <server-port> \
  --base-dir <base-dir> \
  --no-browser

Use these client origins:

• iOS Simulator: http://127.0.0.1:<server-port>
• Android Emulator: http://10.0.2.2:<server-port>
• Physical device: bind the backend to 0.0.0.0 and use the host's reachable LAN origin

Enter the complete http:// origin to make the test transport explicit. Bare IP addresses default to HTTP, while bare hostnames default to HTTPS. When testing web and mobile together, run vp run dev --home-dir <base-dir> --host 127.0.0.1 instead and do not launch a second backend over the same base directory.

Start or reuse Metro safely

Run Metro from apps/mobile.

1. Inspect any process on the intended Metro port and its /status response. Reuse it only when it is healthy, belongs to this worktree, and matches APP_VARIANT=development, --dev-client, and scheme t3code-dev.

2. Never kill another worktree's Metro. Use a free explicit port when necessary.

3. Run vp run dev:client on the standard port. For another port, retain the complete development identity:

   APP_VARIANT=development vp exec expo start \
     --dev-client \
     --scheme t3code-dev \
     --lan \
     --port <metro-port>

   In PowerShell, set $env:APP_VARIANT = "development" first and then run the vp exec expo start ... command without the leading assignment.

4. Open the exact development-client URL for the selected device and confirm the loaded bundle belongs to this worktree and Metro port.

iOS launch

Use ios-debugger-agent to select one UDID and set these XcodeBuildMCP session defaults:

• Workspace: <repo>/apps/mobile/ios/T3CodeDev.xcworkspace
• Scheme: T3CodeDev
• Configuration: Debug
• Simulator ID: the selected UDID
• Bundle ID: com.t3tools.t3code.dev

After ensure succeeds, open the Metro URL:

xcrun simctl openurl <simulator-udid> <printed-dev-client-url>

Accept the iOS confirmation prompt and dismiss the developer menu when it obscures the app.

Android launch

Use the emulator serial already checked by ensure:

adb -s <emulator-serial> reverse tcp:<metro-port> tcp:<metro-port>
adb -s <emulator-serial> shell am start -W \
  -a android.intent.action.VIEW \
  -d '<printed-dev-client-url>' \
  com.t3tools.t3code.dev

Do not start, stop, erase, or reconfigure an emulator owned by another task. Track and later stop only processes owned by this test.

Pair each client once

Use the bundled helper from the repository root. It issues a fresh credential against the running backend's exact base directory, opens the existing Add Environment route with the credential in an encoded query parameter, and asks that route to connect once:

.agents/skills/test-t3-mobile/scripts/pair-client.sh \
  ios <simulator-udid> <server-port> <base-dir>

.agents/skills/test-t3-mobile/scripts/pair-client.sh \
  android <emulator-serial> <server-port> <base-dir>

Run only the command for the selected platform. The helper uses http://127.0.0.1:<server-port> for iOS and http://10.0.2.2:<server-port> for Android. Pass a fifth argument only when testing a non-development URL scheme.

The helper opens this registered route:

t3code-dev://connections/new?pairingUrl=<encoded-pairing-url>&autoConnect=1

The Add Environment route owns the behavior: pairingUrl prefills its normal host and token inputs, while autoConnect=1 submits once in development builds and returns to Home after success. Without autoConnect, the same route only prefills the form for manual inspection.

Do not enter pairing hosts or tokens through simulator keyboard automation. Xcode's semantic typer sends HID-style key events through the simulator's active keyboard state, which can corrupt uppercase tokens and punctuation even when the host Mac uses a U.S. input source. The one-shot route is the deterministic pairing path. Use the visible form only as a fallback, and paste credentials rather than typing them character by character.

Verify the expected seeded projects appear before exercising the affected flow.

Pairing credentials are secret, short-lived, and single-use. Create a different credential for every simulator, emulator, physical device, or browser. If an attempt fails, issue a new credential rather than retrying the old one. Do not expose tokens in screenshots, commits, or final responses.

Drive and observe the affected flow

iOS

Use snapshot_ui and current element references from XcodeBuildMCP for taps and typing. Stream the same UDID through ios-simulator-browser so the user can watch in T3 Code when the host supports it. Use the stream as a visual feed rather than a reason to switch to fragile browser coordinates.

Android

Prefer semantic Android automation exposed by the current agent host. Otherwise inspect the current hierarchy with adb shell uiautomator dump, target stable resource IDs, content descriptions, text, or bounds, and use scoped adb shell input actions. Refresh the hierarchy after navigation. Capture the final state with adb exec-out screencap -p.

Android does not use serve-sim. Use a browser-compatible Android mirror when the host already provides one; otherwise return focused emulator screenshots as evidence rather than installing unrelated streaming infrastructure during verification.

Verify and clean up

Exercise only the affected flow on one representative device unless the change specifically concerns platform, OS version, or screen size. Before finishing:

1. Confirm the app connected to the intended disposable environment instead of merely rendering an empty disconnected state.
2. Capture the relevant final state.
3. Remove the disposable environment from T3 Code Dev.
4. Remove any adb reverse rule created for this test with adb -s <emulator-serial> reverse --remove tcp:<metro-port>.
5. Stop only the serve-sim, Metro, backend, emulator, and log processes started by this test.
6. Remove only base directories and temporary Git repositories deliberately created for this test. Preserve them when they contain useful reproduction evidence.

Keep local verification focused. Do not turn this workflow into a full repository test run.

Troubleshoot predictable failures

• Old UI or an old error appears: verify Metro's worktree, variant, URL, and port before diagnosing the app.
• Metro serves stale or invalid transforms after those checks: stop the owned Metro process and run vp run dev:client:reset once on the standard port. For a custom port, add --clear to the complete explicit expo start command above.
• The environment remains empty: verify the platform-specific HTTP origin, use a fresh token, and confirm project seeding used the identical base directory.
• A second client cannot pair: pairing tokens are single-use; issue another token.
• The pairing form opens but does not connect: confirm the deep link uses the existing connections/new route, includes autoConnect=1, and carries a freshly minted encoded pairingUrl.
• Pairing text changes case or punctuation: do not retry semantic typing. Use scripts/pair-client.sh; the simulator keyboard layout and HID input path are not reliable for credentials.
• iOS semantic actions fail: set explicit XcodeBuildMCP defaults and refresh with snapshot_ui.
• Android cannot reach Metro: verify adb reverse for the exact Metro port and relaunch the development-client URL.
• Android cannot reach the backend: use 10.0.2.2, not 127.0.0.1, for the Android Emulator.