Opposition leader Sussan Ley and her Nationals counterpart David Littleproud agreed to restore senior members to the front bench after a near-three-week separation that featured the duo publicly trading barbs.
The pact was announced on Sunday in a joint statement promising a coalition that would look "to the future, not the past".
The pair were all smiles as they addressed the media together in parliament house, denying any ongoing, interpersonal animus.
"We've resolved those differences, we've strengthened our processes and we're going forward as a united coalition to take the fight up to Labor," Ms Ley said.
"I trust David and I value and respect the National Party as one of the two great parties with ... the greatest political partnership in our history."
Mr Littleproud again walked back earlier comments he made blaming Ms Ley for the coalition split, instead accusing Prime Minister Anthony Albanese of rushing a vote on hate-speech laws that led to Nationals members breaking with the Liberals.
The breach of solidarity conventions triggered the resignation of three Nationals frontbenchers.
The Nationals leader guaranteed there would be no further fractures under his stewardship.
The coalition restoration deal will see all former Nationals frontbenchers reinstated to shadow cabinet after a short sin-bin period.
An offer previously put forward by Ms Ley would have seen them spend six months in parliamentary exile.
But a compromise of six weeks on the back bench, backdated to the mass resignation on January 21, provided an end to the stalemate.
Mr Littleproud and deputy Nationals leader Kevin Hogan will immediately rejoin leadership meetings and shadow cabinet processes.
Frontbenchers will also sign formal agreements to codify shadow cabinet solidarity, in which MPs and senators must step down from their roles if they vote against an agreed position of the Liberal-National joint party room.
The position clearly sets out that the joint party room has primacy over the individual National and Liberal positions, addressing the contradiction that instigated the split.
Three Nationals frontbenchers - Ross Cadell, Bridget McKenzie and Susan McDonald - had voted against Labor's hate-speech laws, in line with a party decision but in defiance of an agreed shadow cabinet position.
The coalition reunification comes during a seismic shift in Australia's right-wing political landscape, with minor party One Nation surging past the combined Liberal and National votes in some polls.
Tensions between the coalition parties remain elevated after Mr Littleproud's insistence they could not get back together with Ms Ley at the helm, seen by many Liberals as an unwelcome intervention in internal party affairs.
Mr Littleproud, who in January said the Nationals "cannot be a part of a shadow ministry under Sussan Ley", insisted that comment came with a caveat: if the three senators who broke shadow cabinet solidarity were not reinstated.
"This wasn't about personality, this was about principles," he said.
Nationals MP and former party leader Michael McCormack said the coalition was much better together as only then could it keep the government accountable.
"It was totally unnecessary," he told Sky News, pointing to a 2008 dispute over wheat policies that led the two parties to agree to vote separately in parliament.
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