pragma solidity ^0.8.13;

contract VerifiedCapabilityRegistry {
    mapping(bytes4 => address) public getAgent;

    event Registered(bytes4 indexed interfaceId, address indexed agent);

    function register(bytes4 interfaceId, address agent) external {
        // supportsInterface(bytes4) selector
        (bool ok, bytes memory data) = agent.staticcall(
            abi.encodeWithSelector(0x01ffc9a7, interfaceId)
        );
        require(ok && data.length == 32 && data[31] == 0x01);
        getAgent[interfaceId] = agent;
        emit Registered(interfaceId, agent);
    }
}