Xcode Tools 1.5 Release was released on 4 Aug 2004 and requires macOS 10.3+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/xcode_v1.5/xcode_tools_1.5_cd.dmg.bin.
Release notes are located at https://download.developer.apple.com/Developer_Tools/xcode_v1.5/554_xcode_tools_1.5_read_me.pdf.