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Agar was returned to the Irish House of Commons for both Gowran and County Kilkenny in 1783, but chose to sit for the latter, a seat he held until 1789, when he succeeded his father in the Irish viscountcy and entered the Irish House of Lords.
He was secretary to Lord Chesterfield during the peer's second embassy to The Hague (1745), and when his patron somewhat later in the year entered on his duties as lord-lieutenant of Ireland, Dayrolles accompanied him in the same capacity, and was nominated by him gentleman usher of the black rod in the Irish House of Lords (2 September 1745), a sinecure.