Show HN: Simboba – Evals in under 5 mins
ntkris Tuesday, January 06, 2026
Hi HN,
I built Simboba because we needed something for our own product, and I wanted to explore how dev tools change with AI coding assistants.
The hardest part of evals is creating good annotated test cases. So I focused on getting users there with the power of AI coding assistants.
How it works:
- AI drafts datasets from your codebase - Web UI to review and refine cases - Everything tracked in git - Multi-turn conversation support - LLM-as-judge + deterministic checks (e.g. was tool xyz called) - Evals run as simple Python scripts
The AI coding assistant angle: I wanted users running customised evals in 5 minutes, not just a generic example. Started with a CLI command that generates a prompt for Claude Code / Cursor. That felt like too much friction. Then tried a separate markdown file with instructions, but AI tools didn't find this easily.
What worked: clear instructions in the README plus structured schemas (Pydantic). The AI reads the README, understands your codebase, the structure required for the package and drafts a real dataset for your product. Then writes the eval script.
I'd love to know what you think, and happy to answer questions!