The families of Sydney siege victims will be granted limited tactical details of the 2014 incident following a deal brokered with NSW Police.

Lawyers for police and the commonwealth had originally objected to any details of the December 2014 incident, which resulted in the deaths of hostages Katrina Dawson, Tori Johnson and gunman Man Haron Monis, on the basis of national security and public interest immunity.

At a hearing on Friday, representative for the Dawson family, Phillip Boulten SC reached an agreement with government lawyers to allow limited details of the action plans used by NSW Police during the siege to be released to both families.

Hostages escaping the Lindt Cafe in Martin Place (Getty)

“Generally speaking, we accept that there are very important matters of national security and public interest that need to be maintained,” Boulten told The Guardian.

“Our clients are being very reasonable but they are still very anxious to know as much as they can about plans that were considered and executed on the night of the siege.”

Under the brokered agreement lawyers for both families will receive full copies of the top secret plans in order to decide if the supplied summaries are sufficient.

Boulten said all parties had agreed that police would provide a summary of the action plans to the families, while their lawyers would see the full plans and decide whether the summaries were adequate.