Cometchat React Native Expo Patterns

What it does

When your agent uses it

• Tasks that involve Cross-platform mobile apps

Example prompts

• “/cometchat-react-native-expo-patterns”

Requirements

• Node.js
• Compatibility (from SKILL.md): Expo SDK >=53 (development builds; ships React Native 0.79 — SDK 52 ships RN 0.76, below the pack's RN floor); React Native >=0.77; @cometchat/chat-uikit-react-native ^5.4.0

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Testing in Expo Go — custom native modules cannot load. Development build, always.
2. 2Editing ios/ or android/ directly — prebuild overwrites it. Use app.json.
3. 3Forgetting punycode — Expo-only, and its absence surfaces as an unrelated module error.
4. 4Reloading JS after an app.json change — native config needs a rebuild.
5. 5Expecting calls to work on a simulator — no camera or mic capture.

What it can do on your machine

Read from SKILL.md and the folder at commit 911b108. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • npm
  • npx

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use npm and npx, which can reach the network depending on how they are called.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Expo SDK >=53 (development builds; ships React Native 0.79 — SDK 52 ships RN 0.76, below the pack's RN floor); React Native >=0.77; @cometchat/chat-uikit-react-native ^5.4.0

  From compatibility in the SKILL.md frontmatter.

Context cost

Cometchat React Native Expo Patterns loads about 1.4k tokens when it runs. Until then it costs about 83 tokens; SKILL.md has 503 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~83

When it runs · the whole SKILL.md, loaded when a task matches

~1.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from cometchat/cometchat-skills at commit 911b108, republished under its MIT licence (© cometchat). 503 words, ~1,436 tokens.

name

cometchat-react-native-expo-patterns

description

Expo-specific wiring for the CometChat React Native UI Kit v5 — why Expo Go cannot work, development builds, app.json permissions, and the Expo-only extra dependency. Triggers: CometChat in Expo, Expo chat app, expo development build CometChat, Expo Go chat not working, expo run ios CometChat.

compatibility

Expo SDK >=53 (development builds; ships React Native 0.79 — SDK 52 ships RN 0.76, below the pack's RN floor); React Native >=0.77; @cometchat/chat-uikit-react-native ^5.4.0

license

MIT

metadata.author

CometChat

metadata.version

1.0.0

metadata.tags

chat cometchat react-native expo development-build app-json permissions

npx expo run:ios      # or: npx expo run:android

npm install @cometchat/chat-uikit-react-native@5 @cometchat/chat-sdk-react-native@4
npm install @react-native-clipboard/clipboard \
  react-native-svg react-native-video react-native-localize react-native-gesture-handler \
  react-native-safe-area-context @react-native-async-storage/async-storage@^2.1.2 dayjs punycode

{
  "expo": {
    "ios": {
      "infoPlist": {
        "NSCameraUsageDescription": "Camera access for video calls",
        "NSMicrophoneUsageDescription": "Microphone access for voice/video calls"
      }
    },
    "android": {
      "permissions": [
        "android.permission.INTERNET",
        "android.permission.CAMERA",
        "android.permission.MODIFY_AUDIO_SETTINGS",
        "android.permission.RECORD_AUDIO",
        "android.permission.ACCESS_NETWORK_STATE",
        "android.permission.BLUETOOTH_CONNECT",
        "android.permission.VIBRATE"
      ]
    }
  }
}

npm install @cometchat/calls-sdk-react-native@5
# 6 REQUIRED peer deps — the calls SDK's declared peerDependencies. Pinned; do NOT float them.
npm install @react-native-async-storage/async-storage@^2.1.2 react-native-background-timer@^2.4.1 \
  react-native-performance@^5.1.2 react-native-svg@^15.12.0 react-native-url-polyfill@2.0.0 \
  react-native-webrtc@124.0.7
npx expo run:ios

© cometchat, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/cometchat-react-native-expo-patterns of cometchat/cometchat-skills.

Open the folder on GitHubat commit 911b108