Two tools with clear verb-noun naming (get_wallet_balance, get_token_holdings) and proper JSON schemas. Descriptions are present but minimal (34-50 chars, below the 50-200 char LLM-optimized baseline). All parameters have type definitions and descriptions. No output schema documentation. Input validation exists (address format check) but error messages lack recovery guidance. Missing tool annotations (readOnlyHint), pagination support, and per-item error handling for batch token lookups.

• Expand tool descriptions to 80-150 chars. Example: 'Get the native token balance (ETH/MATIC) for a wallet. Use this to check account funding before operations. Returns raw and human-readable balances.'
• Document output schemas explicitly. Add to tool definition: outputSchema: { type: 'object', properties: { address: { type: 'string' }, chain: { type: 'string' }, native_balance: { type: 'object', properties: { raw: { type: 'string' }, formatted: { type: 'string' } } } } }
• Add readOnlyHint: true to both tool definitions to signal they are safe for autonomous execution without confirmation.
• Replace silent catch in get_token_holdings with per-item error tracking: return { address, chain, holdings: [...], failed: [{ token_address, reason }] } so agent knows which tokens failed.
• Enhance error message for invalid addresses: throw new Error(`Invalid address format: '${address}'. Expected 0x-prefixed 40-character hex string.`)