How to describe custom tasks?

[jasonmccampbell]

Is there a convenient way to describe commands? That is, specify how to identify any output files names which should be modified to write to a temporary location and sent back. One example is running unit test commands.

Another issue with this is how to send environment variables. If the server is started under a Makefile, the environment may already be setup. Does the client need to capture and transmit any environment info to send with the task?