: Determine if your feature belongs in sander (main simulation engine), pmemd (high-performance engine), or cpptraj (analysis tool).
If amber2.mp4 is a video file—such as an exported molecular trajectory or a creative asset—a feature description would focus on its visual and technical specifications: amber2.mp4
In the context of scientific computing, "writing a feature" typically means adding a new capability or code module to the software suite. : Determine if your feature belongs in sander