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Features configurable permission guardrails including spend limits, chain allowlists, protocol restrictions, and approval thresholds. MetaMask-only (other wallets not supported).\ntags:\n  - crypto\n  - metamask\n  - wallet\n  - ethereum\n  - defi\n  - web3\n  - blockchain\n  - automation\n  - browser\n---\n\n# MetaMask Agent Wallet Skill\n\nControls a sandboxed MetaMask wallet for autonomous blockchain transactions with configurable permission guardrails.\n\n## Overview\n\nThis skill allows AI agents to interact with dapps and execute transactions through a dedicated MetaMask wallet. All operations are subject to user-defined constraints (spend limits, protocol allowlists, approval thresholds).\n\n**Security Model:** The agent controls a *separate* wallet in an isolated browser profile. Never use your main wallet.\n\n## Setup\n\n### 1. Install Dependencies\n\n```bash\ncd metamask-agent-skill\nnpm install\nnpx playwright install chromium\n```\n\n### 2. Create Agent Wallet Profile\n\n```bash\nnpm run setup\n```\n\nThis will:\n- Create a fresh Chrome profile at `~/.agent-wallet/chrome-profile`\n- Install MetaMask extension\n- Guide you through wallet creation (use a NEW seed phrase)\n\n### 3. Fund the Wallet\n\nTransfer a small amount to your agent wallet:\n- ETH for gas (0.01-0.05 ETH recommended)\n- Tokens for operations (start small, e.g., $50 USDC)\n\n### 4. Configure Permissions\n\nEdit `permissions.json` to set your constraints:\n\n```json\n{\n  \"constraints\": {\n    \"spendLimit\": {\n      \"daily\": \"50000000\",    // $50 in 6-decimal format\n      \"perTx\": \"10000000\"     // $10 max per transaction\n    },\n    \"allowedChains\": [1, 137, 42161],\n    \"allowedProtocols\": [\"0x...uniswap\", \"0x...1inch\"]\n  }\n}\n```\n\n## Available Actions\n\n### Connect to Dapp\n```\nconnect <dapp-url>\n```\nNavigates to dapp and connects the agent wallet.\n\n**Example:** `connect https://app.uniswap.org`\n\n### Execute Swap\n```\nswap <amount> <token-in> for <token-out> [on <dex>]\n```\nExecutes a token swap on an allowed DEX.\n\n**Example:** `swap 0.01 ETH for USDC on uniswap`\n\n### Send Tokens\n```\nsend <amount> <token> to <address>\n```\nSends tokens to an address (within spend limits).\n\n**Example:** `send 10 USDC to 0x1234...`\n\n### Sign Message\n```\nsign <message>\n```\nSigns an arbitrary message. Use with caution.\n\n### Check Balance\n```\nbalance [token]\n```\nReturns wallet balances.\n\n### View Transaction History\n```\nhistory [count]\n```\nShows recent agent transactions with outcomes.\n\n## Constraints\n\nAll operations check against `permissions.json` before execution:\n\n| Constraint | Description |\n|------------|-------------|\n| `spendLimit.daily` | Max USD value per 24h period |\n| `spendLimit.perTx` | Max USD value per transaction |\n| `allowedChains` | Whitelisted chain IDs |\n| `allowedProtocols` | Whitelisted contract addresses |\n| `blockedMethods` | Forbidden function selectors |\n| `requireApproval.above` | Threshold requiring user confirmation |\n\n### Approval Flow\n\nWhen a transaction exceeds `requireApproval.above`:\n1. Agent pauses execution\n2. Transaction details are logged\n3. Agent reports: \"Transaction requires approval: [details]\"\n4. User must explicitly approve before agent continues\n\n## Safety\n\n- **Isolated Profile:** Agent uses separate Chrome profile, never your main browser\n- **Separate Wallet:** Agent wallet is completely separate from your main wallet  \n- **Spend Caps:** Hard limits prevent runaway spending\n- **Protocol Allowlist:** Only whitelisted contracts can be called\n- **Full Logging:** Every transaction intent and outcome is logged\n- **Revocation:** Set `\"revoked\": true` in permissions.json to disable all actions\n\n## Logging\n\nAll transactions are logged to `~/.agent-wallet/logs/`:\n\n```json\n{\n  \"timestamp\": 1706900000000,\n  \"action\": \"swap\",\n  \"intent\": { \"to\": \"0x...\", \"value\": \"0\", \"data\": \"0x...\" },\n  \"guardResult\": { \"allowed\": true },\n  \"outcome\": \"confirmed\",\n  \"txHash\": \"0x...\"\n}\n```\n\nUse `history` command to view recent transactions.\n\n## Troubleshooting\n\n### \"Protocol not allowed\"\nAdd the contract address to `allowedProtocols` in permissions.json.\n\n### \"Exceeds daily limit\"\nWait 24h or increase `spendLimit.daily`.\n\n### MetaMask popup not detected\nEnsure the browser profile path is correct and MetaMask is installed.\n\n### Transaction simulation failed\nThe dapp may be trying to call a blocked method or unsupported chain.\n\n## Architecture\n\n```\nsrc/\n├── index.ts          # Main entry point\n├── browser.ts        # Playwright browser management\n├── wallet.ts         # MetaMask interaction primitives\n├── guard.ts          # Permission enforcement\n├── logger.ts         # Transaction logging\n├── price.ts          # USD price estimation\n├── types.ts          # TypeScript types\n└── config.ts         # Configuration loading\n```\n\n## Integration with Gator\n\nWhen Gator accounts are available, permissions.json can be replaced with on-chain permission attestations. 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