EVM Contract Source and ABI Fetcher

This tool retrieves verified Solidity contract metadata for a specific deployment on an EVM-compatible chain. It accepts chain_id (integer EVM chain ID, for example 1 for Mainnet or 8453 for Base) and contract_address (0x-prefixed contract address string). It returns the contract name, full Solidity source code (either flattened text or structured JSON), and the ABI string for downstream security analysis and logic verification. It does not accept any additional JSON payload input beyond these parameters. The tool output must strictly validate against the system-provided structured output schema, with all fields, types, and enums conforming exactly to that schema.