An inventory of what exists
Start with a plain list of every workflow, scheduled job, webhook and integration delivered. For each one, record what it does in business terms, what triggers it, which systems it reads and writes, and where it runs. Include anything that was set up in a connected system, such as a webhook subscription in the CRM or a rule in the email platform, because those are easy to forget.
If the automation platform supports it, the workflow definitions should also live in version control. n8n's source control and environments feature, for example, links instances to a Git repository so changes can move between environments through reviewed commits. Whatever the platform, the business should have a copy of the definitions it controls.