Because the task functionality is currently considered experimental within PCF, the tooling around it within the CF ecosystem is not complete. In order to interact with tasks via the PCF command line interface (CLI), you need to install a plugin: v3-cli-plugin. It’s important to note that this plugin is only compatible with the PCF CLI version 6.17.0+5d0be0a-2016-04-15. You can read more about the functionality the plugin provides in its README.

It’s also important to note that there is no Apps Manager support for tasks as of this release. When running applications as tasks through Spring Cloud Data Flow, the only way to view them within the context of CF is via the plugin mentioned above.