read contract derived

{
  "input": {
    "type": "mcp",
    "toolName": "read_contract",
    "transport": "streamable-http",
    "description": "Call any view/pure function on a smart contract and return the decoded result, using a supplied ABI fragment. Supports historical reads via block_identifier and caller_address context for msg.sender-dependent views. Read-only: state-changing functions are rejected.",
    "inputSchema": {
      "type": "object",
      "title": "ReadContractInput",
      "required": [
        "contract_address",
        "abi_fragment",
        "function_name"
      ],
      "properties": {
        "args": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "title": "Args",
          "maxItems": 50,
          "description": "DEPRECATED: Positional arguments for the function call. Use 'args_json' for complex objects or Gemini compatibility."
        },
        "chain_id": {
          "type": "integer",
          "title": "Chain Id",
          "default": 1,
          "description": "Chain ID (1=Ethereum, 8453=Base)"
        },
        "args_json": {
          "anyOf": [
            {
              "type": "string",
              "maxLength": 2000
            },
            {
              "type": "null"
            }
          ],
          "title": "Args Json",
          "default": null,
          "description": "Optional JSON array string of positional arguments for the function call. Use this instead of 'args' for complex types or when calling via Google/Gemini."
        },
        "abi_fragment": {
          "type": "string",
          "title": "Abi Fragment",
          "maxLength": 65536,
          "description": "JSON array containing the ABI for the function to call. Supports both modern (stateMutability: view/pure) and legacy (constant: true) formats. Only read-only functions are allowed."
        },
        "function_name": {
          "type": "string",
          "title": "Function Name",
          "maxLength": 200,
          "description": "Name of the function to call"
        },
        "caller_address": {
          "anyOf": [
            {
              "type": "string"
            },
            {
              "type": "null"
            }
          ],
          "title": "Caller Address",
          "default": null,
          "description": "Optional EVM address to supply as msg.sender for caller-dependent view functions. This does not sign or submit a transaction."
        },
        "block_identifier": {
          "type": "string",
          "title": "Block Identifier",
          "default": "latest",
          "maxLength": 80,
          "description": "Block number, block hash, or 'latest'/'earliest'/'pending'"
        },
        "contract_address": {
          "type": "string",
          "title": "Contract Address",
          "description": "Contract address (0x…)"
        }
      }
    }
  },
  "output": {
    "type": "json",
    "example": {
      "result": null,
      "chain_id": 0,
      "function_name": "",
      "block_identifier": "",
      "contract_address": ""
    }
  }
}