This feat exists simply to add the supplementary information provided in Chapter 2 of Xanathar's Guide to Everything to a character's sheet so that they can more easily flavor their interactions with their tool proficiencies. It does not function as a standard feat, and is not to be taken as part of an Ability Score Increase.

Mason’s tools allow you to craft stone structures, including walls and buildings crafted from brick.

Components. Mason’s tools consist of a trowel, a hammer, a chisel, brushes, and a square.

History. Your expertise aids you in identifying a stone building’s date of construction and purpose, along with insight into who might have built it.

Investigation. You gain additional insight when inspecting areas within stone structures.

Perception. You can spot irregularities in stone walls or floors, making it easier to find trap doors and secret passages.

Demolition. Your knowledge of masonry allows you to spot weak points in brick walls. You deal double damage to such structures with your weapon attacks.