The following is the output of an attempt to add a host using th API and CLI tool:

add host host=host dns=test groupids=1
*Debug(7)* parse_input: add host host=host dns=test groupids=1
*Debug(6)* params_to_hash: ["host=host", "dns=test", "groupids=1"]
*Debug(5)* start: Parsed input loop start: {:command=>:addhost, :parameters=>{"groupids"=>"1", "host"=>"host", "dns"=>"test"}}
*Debug(6)* addhost: Parameters passed in:

{"groupids"=>"1", "host"=>"host", "dns"=>"test"}

*Debug(10)* json_obj: json_obj: auth1a8f535c005ac6d0fb34f512e7ec6476id3methodhost.addparamsuseip0groupids1hosthostdnstestjsonrpc2.0
*Debug(8)* do_request: Sending: {"auth":"1a8f535c005ac6d0fb34f512e7ec6476","id":3,"method":"host.add","params":[

{"useip":0,"groupids":"1","host":"host","dns":"test"}

],"jsonrpc":"2.0"}
*Debug(8)* do_request: Response Code: 200
*Debug(8)* do_request: Response Body: {"jsonrpc":"2.0","error":

{"code":-32500,"message":"Application error.","data":"Unknown ZABBIX internal error [CHost]"}

,"id":3}
An error was received from the Zabbix server
Error code: -32500
Error message: Application error.
Error data: Unknown ZABBIX internal error [CHost]