nuget-agent/resources/META-INF/build-agent-plugin-nuget-pack.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"
       default-autowire="constructor">

  <bean class="jetbrains.buildServer.nuget.agent.runner.pack.PackRunner"/>

</beans>