Tool upgrade sequence and downtime
Blacksmith upgrades improve tools in ascending material order and take two days, leaving the tool unavailable during that interval. Plan around the work it supports.
How it works
The Tools guide says upgrades use gold and metal bars, proceed through ascending materials, and take two days. It also says the shop and geode service remain available during the upgrade. Its practical timing description says you wake without the tool on the next day and collect it from the Blacksmith the following day.
When it helps
Consider upgrading when the improved power or area will help recurring work and you can manage without the tool during the interval. The supplied passages do not establish a universally best upgrade order.
The tradeoff
A stronger tool can reduce effort for a task, but the upgrade temporarily removes it from use and requires gold and bars.
Your next step
Identify the tool you rely on most, check its next material tier, and plan around the days it will be unavailable.
Read the supporting references
Check the edition and source version for patch-specific details. Guide methodology.