PSA: On the surface it looks great - but it's something that spawns a Python server (with uv - I think) and does communicate with it during tests. I don't think it's complexity we need to take on on our unit tests.

A saner approach would be to start with a FFI-friendly language and create bindings. I don't think just being able to use an already written framework in Python is worth the trade-off.

> A saner approach would be to start with a FFI-friendly language and create bindings. I don't think just being able to use an already written framework in Python is worth the trade-off.

For what it's worth the devs say their "current long-term plan is to implement a second Hegel server in Rust" [0], so the current state of affairs is probably a compromise between getting something usable for end users out and something more "sane", as you put it.

[0]: https://antithesis.com/blog/2026/hegel/#what%E2%80%99s-next