SolidCraft is an open-source parametric 3D CAD application for designing and revising parts and assemblies. Users create dimensioned, constrained sketches, add features such as extrusions, revolutions, fillets, shells, holes, and patterns, and edit designs through a feature timeline with parameters and configurations. It includes component assemblies, joints, motion studies, sheet-metal workflows, and plastic-part tools. Desktop and browser editors, command-line tools, and a Model Context Protocol (MCP) server support interactive, scripted, and agent-assisted modeling. SolidCraft imports and exports formats including STEP, IGES, STL, OBJ, and 3MF, with format-specific limits; assemblies can also be exported as URDF. The software serves people who design, inspect, edit, or exchange mechanical parts and assemblies.