# Changelog #0009

Happy Friday!

Nothing user-facing to report in this week’s changelog, so hang tight.

We continue to invest in internal tooling: evals, infra rewrite, and prepping last week’s [automatic template induction POC](https://blog.butter.dev/changelog-0008#heading-automatic-template-induction) for production.

For fun, here’s a shout-out for some of the tools we’ve been using and loving:

* [Bun](http://bun.sh) for runtime and tests.
    
* [E2B](http://e2b.dev) for TS sandboxing.
    
* [Braintrust](http://braintrust.dev) for evals.
    
* [Vercel](https://ai-sdk.dev/docs/introduction) AI SDK for structured generation.
    
* And of course, [Butter](http://butter.dev) for caching tests and evals - it’s really sped up our iteration cycles to have LLM requests return 20x faster.
    

Stay tuned next week for more updates!