depot projects create now supports a --cache-policy-keep-days flag, so you can set build cache retention at creation time instead of adjusting it afterward.

depot projects create my-project --cache-policy-keep-days 30

The default is 14 days, and 0 means no limit. Previously, cache TTL could only be set through the SDK or the dashboard, which made scripting project management against the CLI difficult. See the CLI reference.