Agent Builder Platforms offer visual, low-code, or managed environments for creating and deploying AI agents — targeting product teams, operations teams, and semi-technical builders who need to ship agent-powered workflows without writing framework-level code. Core capabilities include visual workflow editors with drag-and-drop agent graph construction, pre-built tool and integration connectors, managed hosting and one-click deployment, prompt management and testing, built-in evaluation, and scaling infrastructure. The category absorbs the AI workflow automation space as those tools add autonomous agent capabilities. It spans open-source builder platforms (Dify, Langflow, Flowise) and commercial agent platforms (Vellum, Relevance AI, MindStudio, Wordware) as well as AI automation tools converging toward agent builders (Lindy, Bardeen).