Australia and Indonesia will pledge to potentially helping each other in the face of a security threat, but details of the landmark agreement remain under diplomatic camouflage.

Alongside the Indonesian president, Prime Minister Anthony Albanese on Wednesday said the treaty marked a "new era" in the relationship between the two neighbours.

He said the deal commits the nations to consult regularly at the highest levels on matters of security, and consider possible measures should either's security be threatened.

"It is a significant extension of existing security and defence cooperation," the prime minister told reporters in Sydney on Thursday.

Foreign Minister Penny Wong was scant with details on the types of scenarios that could trigger Australia into action under the deal.

"I'm not

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