The Guardian Protocols were rules implemented by the Jedi High Council during the High Republic Era to deal with the Nihil conflict.
The Guardian protocols were implemented by the Jedi High Council many generations before the Nihil conflict.
One method of the Guardian Protocols was to accelerate the Jedi youngling's training by letting them use real lightsabers instead of training lightsabers.
The Jedi Council informed the Galactic Senate of these rules of conduct. The Guardian Protocols also included Jedi Outposts being staffed by droids, pausing of independent research, early Padawan trials, restrictions of resource management, offensive combat as required, and most importantly no Jedi travels alone.
The words of the Guardian Protocols presented to the Galactic Senate were:
Charles Soule revealed that the Guardian Protocols were not created for the Nihil conflict and are instead a rarely used group of policies for times of crisis.
- Star Wars: The High Republic Character Encyclopedia