Trilateral defense pact ...
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Pakistan’s role will also be limited to what the Saudis want. A precedent was set once by Nawaz Sharif. At the time, a procedure was established under which parliament would decide on the direct deployment of Pakistani forces in Saudi Arabia. Pakistan’s parliament voted against the proposal when General Bajwa was the commander of the Pakistani army. As a result, Pakistan’s role was limited to the air force.
But now, with Asim Munir wielding considerable power, I doubt Shehbaz Sharif would follow his brother’s precedent and refer the matter to parliament.
We would probably see a Pakistani military presence along the border between Yemen and Saudi Arabia, although it would most likely take the form of an advisory role. A military presence involving Pakistani soldiers directly engaging Ansarullah forces is unlikely because of the complications that could arise — for example, if they were taken prisoner and the international consequences that would follow.
I doubt such a scenario would happen on that scale. But an advisory presence, along with the continued involvement of Pakistan’s air force, is possible if Saudi Arabia makes such a request.