Answer
List only the allowed actions in policy lines, omitting others (default deny). For example allow get and sync but not delete or override. Because ArgoCD RBAC is deny-by-default, granting sync without a delete rule means the user can trigger syncs but cannot delete the application.
p, role:operator, applications, get, '*/*', allow
p, role:operator, applications, sync, '*/*', allow
# no delete rule -> delete deniedReal-world example On-call operators can sync any app to recover from drift but cannot delete apps, limiting accidental damage.