[jmillikin]

Yeah, pretty much all of them are written in either Go or Rust. The Go tools pull in the Go standard library's Go parser to do things like compute dependencies via package imports, and the Rust ones use the Cargo libraries to parse Cargo.toml files.

From the perspective of a Bazel ruleset maintainer, precompiled helper tools are much easier to provide if your language has easy cross-compilation. So maybe one day Zig will start to make an appearance too.