Game concept
Builder
From the game's encyclopedia
A Builder wants to invest all of their Gold into the Realm. They will empty their treasury to fund Buildings and Men-at-Arms, and often construct more Economic Buildings and Holdings. They only save up gold if directly threatened, such as by a strong Faction.
Builder rulers are slightly less likely to create and promote Legends.
Bold Rulers with a propensity for building and no particular inclination for War tend to be Builders.
Common Traits include Calm, Patient, Diligent, Generous, Stubborn, and Profligate. Rulers with the Domain Focus also tend to be Builders.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Builder is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Builder wants to invest all of their Gold into the Realm." It is part of Economic Archetype. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.