ToolsTree=yes

[unonweb]

Version: 26
Host: Debian 13

Issue:
With ToolsTree=mkosi.tools mkosi.conf fails to build and throws Tools Tree is missing /etc/resolv.conf or if you fix that by manually placing this file into the ToolsTree there will be another error.

Solution:
ToolsTree=yes

I suppose that if you specify a custom path mkosi expects an existing ToolsTree there and is not willing to build a new one. I think this is not very clear in the docs.