The "Balance Checks" feature is critical for enabling AI Agents to make informed decisions in blockchain workflows. In the context of a toolkit, this feature provides a reusable utility to query real-time balances for SUI tokens and other fungible tokens in a wallet. The utility must be modular, extensible, and easy to integrate into any AI-driven system.

This document provides a detailed guide to implement the Balance Checks feature, ensuring it is reusable and supports autonomous workflows.

Purpose of the Balance Checks Feature

The Balance Checks feature allows AI Agents to:

1. Retrieve Real-Time Balances: Query the current balances of SUI tokens and other fungible tokens in a wallet programmatically.
2. Enable Decision-Making: Use balance data to guide actions like token transfers, swaps, staking, or triggering alerts.
3. Support Multi-Token Wallets: Provide a comprehensive view of all tokens held by a wallet, including SUI and custom fungible tokens.
4. Ensure Modularity: Design the feature as a standalone utility that can be reused in various AI Agent workflows.

Key Features

1. Fetch SUI Token Balance:
   • Query the balance of the native SUI token in a wallet.
2. Fetch Custom Token Balances:
   • Retrieve balances for other fungible tokens (e.g., application-specific tokens created on SUI).
3. Comprehensive Balance Check:
   • Fetch all token types held by a wallet in one query.
4. Validation and Error Handling:
   • Handle scenarios like disconnected wallets, empty wallets, or RPC query failures gracefully.
5. Integration with AI Agents:
   • Provide balance data in a structured format that can be easily consumed by AI systems.

Implementation Steps

Step 1: Understand SUI's Balance Query Mechanisms

The SUI blockchain provides several RPC methods to retrieve token balances: