What is Tool Design?

How is a Tool Design on Design Process?

Production planning and tool design that does more than plan how to mass produce the project and the tools should be used in manufacturing parts. Task to resolve in this step including selecting materials, selection of production processes, determining the sequence of operations, and selection tools, such as jigs, fixtures, and tooling. This task also involves the testing of working prototypes to ensure parts are designed to meet qualification standards.

Here is a tool design guide selection:

Jig and Fixture Design