Now, the original purpose of the prime directive was to give Starfleet officers a stance to take whenever dealing with a developing society, and the responsibilities therein are:
Taken from Memory Alpha
There were stated exceptions for Starfleet officers, where they could interfere:* Providing knowledge of other inhabited worlds (even if individuals or governments in the society were already aware of such)
* Providing knowledge of technologies or science
* Taking actions to generally affect a society's overall development
* Taking actions which support one faction within a society over another
* Helping a society escape the negative consequences of its own actions
* Helping a society escape a natural disaster known to the society, even if inaction would result in a society's extinction.
* Subverting or avoiding the application of a society's laws
* Interfering in the internal affairs of a society
Taken from Memory Alpha
So, how would you rewrite it? What would you keep, what would you add, and what would you remove from the Prime Directive?* The society already knew of and contacted the Federation (e.g., seeking assistance; treaty matters)
* The society sent a general distress call to any space-faring cultures who might pick it up
* A material injustice involving a Federation citizen would occur absent the interference
* Compliance with specific (and valid) orders that could not be followed if the Prime Directive fully applied (e.g., ancillary to a war with the Federation; first contact missions; diplomatic missions; trade negotiations)
* The society hails or attacks a Federation vessel (TOS: "The Corbomite Maneuver"; VOY: "Thirty Days")
* Rescue missions
* The society is in diplomatic discussions with the Federation
* The society was previously interfered with by Federation citizens, whether or not in violation of the Prime Directive (e.g., prior to the Prime Directive being in force; accidental interference).
* The society was previously interfered with by non-Federation citizens (e.g., Klingons) in a manner that would have violated the Prime Directive had it been done by Starfleet personnel
* The society had been contacted by Starfleet but, upon recommendation by the contact/survey team, the planet was nonetheless subject to the Prime Directive as though such contact had not occurred.