How to Make a Flowchart or Diagram with Claude

The short version

Drawing a process is the fastest way to find out where it breaks. Describe how something works today, let Claude draw it, then ask it where a customer could get stuck or a task could fall through the cracks.

Step by step

1. Pick one process with a clear start and end: “a customer orders a cake”, “a new hire’s first week”.
2. Describe the steps in order, as you would to a new employee, including who does each one.
3. Name the decisions: “If the cake is custom, the baker approves the design first.”
4. Ask Claude to draw it as a flowchart Artifact.
5. Ask for problems: missing steps, decisions with no “no” branch, steps with no owner.
6. Fix and redraw until it matches reality.

Prompts to copy

Draw it:

Draw a flowchart of this process. Use boxes for steps, diamonds for decisions, and label who does each step.
<process>
A customer orders a custom cake by phone or website. If it's a custom design, the baker approves it
within a day; if not approved, we call the customer. Customer pays a 50% deposit. Baker bakes the day before.
Customer picks up and pays the rest.
</process>

Find the gaps:

What's missing from this process? List decisions without both branches, steps without an owner,
and places a customer could wait without hearing from us.

Get editable code:

Give me this flowchart as Mermaid code too, so I can edit it in other tools.

Example

The cake process above, once drawn, shows a gap: if the customer misses pickup, nothing happens. That’s a real problem (a wasted cake and a lost deposit dispute) found in two minutes.

Mistakes to avoid

• Describing the ideal process instead of the real one. Draw what actually happens.
• Too much in one chart. Split big processes into a few smaller ones.
• No owners. Every step should say who does it.

When to go further

A clear flowchart is also the best brief for software: if you want online ordering or booking built around your process, it shows a developer exactly what to build. See our project playbook for how we use these diagrams.

Related: use Claude Artifacts.