Show HN: An AI agent that debugs your LLM app and submits pull requests

Hi HN,

I built Kaizen Agent, an open-source CLI tool that acts like an AI QA engineer for your LLM applications and agents.

It helps catch broken behavior, apply fixes automatically, and open a pull request — all in one workflow.

What it does: - Runs test inputs with expected outputs

- If a test fails, it analyzes the failure

- Applies prompt/code fixes

- Re-runs tests until they pass

- Submits a GitHub PR with the fix

Why I built it: I got tired of manually debugging and iterating while developing multi-step LLM agents. Writing test cases, checking outputs, tweaking prompts, rerunning — it was all too repetitive. This tool automates that loop.

Try it: GitHub: https://github.com/Kaizen-agent/kaizen-agent

Would love feedback — especially from anyone building agents, LLM tools, or testing frameworks. Curious how others are thinking about evaluation, brittleness, and automation in this space.