The agent.jar (formerly known as slave.jar ) is the core executable used to connect a remote machine to a Jenkins controller via the or WebSocket protocol. For peak performance and stability, you must always download the version of agent.jar that matches your specific Jenkins controller version. How to Download agent.jar
You can obtain the agent.jar file through the Jenkins web interface or by using command-line tools like curl . This is the easiest method for manual setup: Best way to update agent.jar - Ask a question - Jenkins jenkins agent.jar download