From Molines-en-Queyras, take the D205T to the Refuge Agnel (2,580 m) located on the right of the road, then park either in the refuge car park or in the car park on the left of the road 250 m further on.
(S/E) From the refuge, go up the road to the first hairpin bend, then take theGR®58(red and white markings) on the left to Col Vieux.
(1) Take the path to the south-east to reach and then follow the base of the Pain de Sucre.
(2) Take the path on the right. It is the one furthest to the right that allows you to climb up. Cross the slabs following the right side of the western ridge of the peak (this is also the easiest route, as taught to me by a local hiker).
As you approach the summit, the trail disappears into the rocks and you have to climb the last slabs using your hands a little.
(3) Return in the opposite direction to reach the car park (S/E).