Service Tax clarification

I need clarification for two below mentioned queries.:

1.      One of my client is acting as a commission brokers.  He is acting as an agent for local importers for importing Raw Cashew Nuts in shell from Foreign countries to india on contract basis.  He is getting commission from the importers.  Whether service tax is applicable?   Or exempt under the head of “Agricultural Products”.

and

2.      Another client, he is also acting as a commission brokers.  He is acting as an agent for local exporters for exporting processed cashewnets to foreign countries on contract basis.  He is getting commission from the Exporters.  Whether service tax is applicable?   Or exempt under the head of “Agricultural Products”