The local_action parameter can be used to run a task on the control node (that's your Ansible server). Some (but not all) modules will also accept the connection and/or delegate_to modules to run the task on the control node.
In this example, the file module is used to remove a file on the control node.
- name: "remove foo.txt on control node" local_action: module: "file" path: "/tmp/foo.txt" state: "absent"
Running this task should produce the following.
TASK [remove foo.txt on control node] changed: [server1.example.com -> localhost]