The Kiwis were rocked to hear that Hansen was in enemy territory ahead of next month's tournament in France, with their prime minister Chris Hipkins joking they should cancel his citizenship.
Veteran hooker Dane Coles said he was gob-smacked and admitted it "hurt a bit" to see his former coach involved with their arch-rivals.
Jones said he had called on his long-time coaching rival and good friend to get a fresh perspective on the Wallabies, who open their World Cup against Georgia on Saturday September 9 (local time).
"I've coached against Steve since 1998 so we've got a long relationship, enjoy each other's company and I always had the thought we wanted this week to be a reset week for us," Jones told reporters from France on Tuesday night.
"We've been through the Rugby Championship, done our Australian responsibilities and now it's a rest so we've brought in Steve to have a look at what we're doing.
"It's purely like a mate having a beer (asking) 'What do you think? Where can we improve'?"
Asked what Hansen was looking at, Jones replied: "There's two main areas: there's training quality, which is our way of improving, and leadership of the team.
"So Steve is having a look at both of those areas.
"Every time he speaks there is some wisdom is what he says - when he says something, we are listening to him and how we can improve what we are doing, we are looking to to see if we can use his advice to do that."
While it caused shock-waves across the Tasman Jones said his players welcomed someone of Hanson's calibre, who boasts the most wins of any All Blacks coach.
"They like good people coming into camp, they want to get better and they can see the value of Steve," Jones said.
"If you just look at his Test record, I think he's coached 200 Tests; for the All Blacks he won I think 87 per cent.
"So they like good people coming into camp and he's a good person, so the reaction has been really positive."'
