ToolBox uses a locally subsetted JetBrains Mono 2.304 font, renamed ToolBox Mono.
Source: https://github.com/JetBrains/JetBrainsMono/tree/v2.304
License: JetBrainsMono-OFL.txt

Selected Lucide 1.8.0 SVG geometry.
Source: https://github.com/lucide-icons/lucide
License: Lucide-LICENSE.txt
No font or icon requests are sent to third-party hosts.