Under "Prerequisites"[0] I see: "Get an Anthropic API key".

I presume this is temporary since the project is still in alpha, but I'm curious why this requires use of an API at all and what's special about it that it can't leverage injecting the prompt into a Claude Code or other LLM coding tool session.

[0]: https://codespeak.dev/blog/greenfield-project-tutorial-20260...