Show HN: Open-source, developer-first prompt engineering platform

Hey HN - over the past few months, we’ve been working on Hatchet, which lets you write and manage workflows as code (previous HN post [1]).

Today we’re launching Hatchet's prompt engineering features, which lets developers create internal playgrounds from existing code. Unlike other platforms, Hatchet is backed by our low-latency workflow engine which lets you run any function within your codebase, not just managed or third-party LLM templates. This is useful for a number of reasons:

- Your prompt engineering playground is directly in sync with your codebase. We also support creating pull requests to your codebase from our UI when you’ve made changes to prompt parameters.

- You can view how changes to an LLM call impact the rest of your function calls downstream

- When deployed in production, you get full observability into inputs/outputs to each of your function calls so you can trace and capture user-facing errors

We built this because we got tired of using prompt engineering tools that don’t integrate well with your existing codebase - and we felt our workflow engine was a good fit for solving this.

Looking forward to hearing your thoughts and feedback on our tool.

[1] https://news.ycombinator.com/item?id=38970038