prescriptive

prescriptive /prɪˈskrɪptɪv/ adjective
prescriptive
/prɪˈskrɪptɪv/
adjective
Britannica Dictionary definition of PRESCRIPTIVE
1 
[more prescriptive; most prescriptive] : giving exact rules, directions, or instructions about how you should do something
2 
technical : providing rules and opinions that tell people how language should be used — opposite descriptive