Which tool is typically used to create initial sketches within a scratch area?

The brush tool is commonly used to create initial sketches within a scratch area because it allows for freehand drawing, enabling artists to express their ideas fluidly and organically. This tool mimics the effect of a traditional paintbrush, providing versatility in line thickness and stroke style. Artists can adjust the pressure and angle of the stroke, making it suitable for capturing the nuances of their thoughts and designs as they develop their concepts.

In contrast, while the text tool is designed primarily for adding written content, the line tool focuses on creating straight lines and geometric shapes, which may not effectively convey the artistic and freeform nature of a preliminary sketch. The grid tool is used for alignment and precision, providing a framework, but it does not facilitate the free, creative expression needed for initial sketches. Thus, the brush tool stands out as the most appropriate choice for this purpose.