Adding agent id to the webform query

Hello
I'm working on a webform that could help me add more custumer informations. i found a problem trying to set automatically the AGENTID field of my form with the current Agent ID. It seems it does not existe any variable for it in vicidial like for phone number for exemple (--A--phone_number--B--).
How could i make this work. is there an other way instead of VARS to achieve this.
Thanks and i'm sorry for my english (sincerly).
P.S i'm using limesurvey to edit my webforms.
I'm working on a webform that could help me add more custumer informations. i found a problem trying to set automatically the AGENTID field of my form with the current Agent ID. It seems it does not existe any variable for it in vicidial like for phone number for exemple (--A--phone_number--B--).
How could i make this work. is there an other way instead of VARS to achieve this.
Thanks and i'm sorry for my english (sincerly).
P.S i'm using limesurvey to edit my webforms.