Sequence diagrams, with a clearer story.

A practical workflow

1. Choose one scenario, such as sign-in or checkout. List each participant once, using the same names as the implementation.
2. Write messages in time order and distinguish requests from responses. Include the failure branch that matters most.
3. Check the source and rendered preview together. Share the diagram alongside assumptions about timeouts, retries, or authentication.

Try this starting prompt

Create a sequence diagram for password sign-in with a browser, API, and user database. Show credentials submission, password verification, session creation, success response, and an invalid-password alternative.

Adapt the names, connections, and constraints to your own system. AI output is a draft: inspect its assumptions and edit the result before sharing.

Choose the handoff

Use the visual canvas for presentation, Code or Split view for precise changes, and saved versions before major revisions. A read-only link is useful for a quick review; export source or an editable project backup when the recipient needs to continue editing.