Tonel is a text-based file format used to store Smalltalk source code on disk, and was designed from scratch to be version control system (VCS) friendly. Because it is widely accepted by the Smalltalk community, Tonel support was introduced in VAST Platform 2021 (10.0.0). Tonel support is meant to enhance ENVY (the standard VCS in VAST).

For more, see Appendix: Tonel