Slave missing Jenkins Groovy api jars

[Baz Lov]

I have a windows slave I am trying to use the Jenkins Groovy api on from the Groovy plugin "Execute Groovy Script" job element. However when I run the script it keeps throwing class not found exceptions for classes that come from dependencies of the Jenkins Groovy api. The first one was jenkins-core.jar. Is there a way I can tell Jenkins to deploy the api to the slave? So far I have been downloading them one at time.

I have admin access to the the slave in Jenkins and the server itself and I can configure my job by I cannot manage the Jenkins master. Although if master admin rights are required please tell me how to do it as if I had them.