argent-metro-debugger
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How to install argent-metro-debugger?
software-mansion/argent/argent-metro-debugger
$npx -y skills add software-mansion/argent --skill argent-metro-debuggerargent-metro-debugger is an agent skill published from software-mansion/argent, installable through the skills CLI.
SKILL.md
| 1 | ## 1. Prerequisites |
| 2 | |
| 3 | For **React Native (iOS / Android)**: requires **Metro dev server running** (default `localhost:8081`) and **a React Native app connected to Metro** (at least one CDP target). Verify via `debugger-status`. |
| 4 | |
| 5 | For **Vega (Fire TV)**: requires a **Debug `.vpkg`** (a Release build never attaches) and **Metro reachable from the device** (`vega device start-port-forwarding --port 8081 --forward false`). Verify via `debugger-status`. `debugger-component-tree`, `debugger-inspect-element`, `debugger-reload-metro` and the `react-profiler-*` / `profiler-*` tools are unavailable there — see the `argent-tv-interact` skill. |
| 6 | |
| 7 | For **Chromium (CDP)**: requires a Chromium/CDP app already available — an Electron app booted via `boot-device` with `electronAppPath`, or any Chromium browser exposing a CDP port (auto-discovered by `list-devices` on `9222` / `ARGENT_CHROMIUM_PORTS`). The debugger re-uses the page CDP session — `port` is ignored, `device_id` is the `chromium-cdp-<port>` value from `list-devices` / `boot-device`. Only `debugger-connect`, `debugger-status`, `debugger-evaluate`, `debugger-log-registry`, `view-network-logs`, and `view-network-request-details` work on Chromium (the latter two read the browser's native CDP Network recording for the active tab instead of the Metro-injected `fetch` interceptor); `debugger-component-tree`, `debugger-reload-metro`, `debugger-inspect-element`, and the `react-profiler-*` / `profiler-*` tools are RN-only and reject Chromium at the capability gate with `Tool 'X' is not supported on chromium app`. |
| 8 | |
| 9 | ### Android: reverse port for Metro |
| 10 | |
| 11 | Android emulators and physical devices do not resolve the host's `localhost` by default. Before the RN app can reach Metro, forward port 8081 (or whichever port Metro is on) from the device back to the host: |
| 12 | |
| 13 | ```bash |
| 14 | adb -s <serial> reverse tcp:8081 tcp:8081 |
| 15 | ``` |
| 16 | |
| 17 | `<serial>` is the Android `serial` from `list-devices`. Once reversed, the app on the device connects to Metro just like an iOS simulator does, and all `debugger-*` / `network-*` / `react-profiler-*` tools work unchanged. If the device restarts or adb drops, re-run the command. A failing Metro connection on Android almost always means `adb reverse` has not been done or has been lost. |
| 18 | |
| 19 | ## 2. Tool Overview |
| 20 | |
| 21 | All tools accept `port` (default 8081) AND `device_id` (the iOS Simulator UDID, Android serial, or Vega serial — a.k.a. `logicalDeviceId`, the CDP-reported id that matches the device). Vega's legacy inspector reports no `logicalDeviceId`, so there keep passing the serial. Always make sure you target the correct app on the correct device. |
| 22 | |
| 23 | One Metro port can serve multiple connected devices (e.g. two simulators on `localhost:8081`, or an iOS simulator alongside an Android emulator with `adb reverse` set up). `device_id` pins every debugger/network/profiler call to a specific device so sessions do not collide. |
| 24 | |
| 25 | ### Connect & diagnostics |
| 26 | |
| 27 | | Tool | Purpose | |
| 28 | | ------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | |
| 29 | | `debugger-connect` | Connect to the JS runtime's CDP (Metro on iOS / Android / Vega; the page CDP session on Chromium). Returns port, projectRoot (empty on Chromium and on legacy Metro, e.g. Vega), deviceName, appName, `logicalDeviceId` (absent on Vega), isNewDebugger, connected. When a `logicalDeviceId` comes back, use it as the `device_id` for every subsequent debugger call. | |
| 30 | | `debugger-status` | Like connect + loadedScripts, enabledDomains, sourceMapReady (no-op on Chromium). **Use to diagnose.** | |
| 31 | |
| 32 | ### Reload & recovery |
| 33 | |
| 34 | | Tool |
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