# Add Expo Secure Store

> Use expo-secure-store for secrets (tokens, API keys) backed by iOS Keychain. Use when the user says 'secure storage', 'Keychain', 'store token', 'API key storage'.

- **Type:** Skill
- **Install:** `agentstack add skill-khadinakbarlabs-expo-mobile-app-builder-add-expo-secure-store`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [khadinakbarlabs](https://agentstack.voostack.com/s/khadinakbarlabs)
- **Installs:** 0
- **Category:** [Security](https://agentstack.voostack.com/c/security)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [khadinakbarlabs](https://github.com/khadinakbarlabs)
- **Source:** https://github.com/khadinakbarlabs/expo-mobile-app-builder/tree/main/skills/add-expo-secure-store
- **Website:** https://khadinakbar.com

## Install

```sh
agentstack add skill-khadinakbarlabs-expo-mobile-app-builder-add-expo-secure-store
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Add Expo Secure Store

Encrypted at-rest storage backed by iOS Keychain. Use for auth tokens, API keys, anything sensitive.

## Install
```bash
npx expo install expo-secure-store
```

## Usage
```ts
import * as SecureStore from 'expo-secure-store';

// Save
await SecureStore.setItemAsync('authToken', token);

// Read
const token = await SecureStore.getItemAsync('authToken');

// Delete
await SecureStore.deleteItemAsync('authToken');

// With biometric protection (Face ID / Touch ID required to unlock)
await SecureStore.setItemAsync('vaultKey', secret, {
  requireAuthentication: true,
  authenticationPrompt: 'Authenticate to access your vault',
});
```

## ABSOLUTE NO
- Never store tokens in AsyncStorage or MMKV (no encryption at rest)
- Never store more than 2KB per item (Keychain limits — use expo-sqlite for larger)
- Never call from main thread in tight loops (it's async, use it that way)

## Add Face ID permission
```json
{
  "expo": {
    "ios": {
      "infoPlist": {
        "NSFaceIDUsageDescription": "Access your secure vault"
      }
    }
  }
}
```

## Reference
`references/01-expo-sdk-54.md`

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [khadinakbarlabs](https://github.com/khadinakbarlabs)
- **Source:** [khadinakbarlabs/expo-mobile-app-builder](https://github.com/khadinakbarlabs/expo-mobile-app-builder)
- **License:** MIT
- **Homepage:** https://khadinakbar.com

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-khadinakbarlabs-expo-mobile-app-builder-add-expo-secure-store
- Seller: https://agentstack.voostack.com/s/khadinakbarlabs
- Browse the marketplace: https://agentstack.voostack.com/browse

---
Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.