Say what to draw
FigJam diagrams can be flowcharts, Gantt charts and sequence diagrams, made from a description or from Mermaid. Pointing at code gets you a diagram of what the code does rather than what someone remembers.
Say to Claude CodeCreate a flowchart for the user authentication flow. Read the code in src/auth to get the real steps, including the error paths.
Refine it by asking
Say to Claude CodeAdd the password-reset branch, and mark the steps that call an outside service.
Try another shape
The same description can become a sequence diagram, which shows who calls whom.