Masonry is the Search the List category - though Stucco is not a normal mason's product - Stucco would be the category for that.
However, I urge you to reconsider stucco over a chimney - not only is that a bad thing for brick unless there are "standoffs" (non-combustible firring) and vented space between the chimney and the stucco so the brick does not stay damp, stucco is not really a waterproof product so its survival rate above the roofline or on houses in wet areas without substantial roof overhangs is dubious. Nor is it a structural product for this application, if you are looking to do this as a "repair" due to deteriorating brick or mortar. Also, stucco construction means a lot of nails or masonry screws into the brick,, which will break it and the mortar up even more.
Stucco is basically a dry climate exterior covering, especially if exposed to the weather. IT can handle some rain against it, but not chronic wetting or water getting behind it like through cracks in the stucco or especially on chjimneys, failed or undersized chimney crown so instead of shedding the water on top of the chimney so it stays off the stucco, it gets onto/into it.
If you do decide to stucco (cringe), make sure that the crown is redone to include a metal flashing pan under the cement crown (or metal crown and cap), AND that it extends will past the surface of the chimney and has dripedge provision, so the runoff does not run down or behind the stucco. On chimneys, it is best if the crown detainl not only extends beyond the surface 3-4 inches minimum, but also covers the top 4-6 inches of the facing/siding on the chimney so water can't blow in at the top of the stucco off the dripedge.
Here are links to a couple of previous similar questions with answers FYI -
https://answers.angieslist.com/What-c...
https://answers.angieslist.com/Is-bri...
