Feature management is the OSRS feature that manages other features of the Open Source Rule Set. This feature allows all other OSRS features to be toggled on or off through their respective flag variables. So if a specific feature does not work or is not desired, then a module builder can turn the corresponding flag off, causing that feature's code to not be executed. This also allows a feature to be turned on (for testing perhaps) by changing only a single flag.
All future OSRS features must comply with this feature.