Agentic QA – Open-source middleware to fuzz-test agents for loops

39•Saurabh_Kumar_•2mo ago

I built this because I watched my LangChain agent burn ~$50 in OpenAI credits overnight due to an infinite loop.

It's a middleware API that acts as a 'Flight Simulator'. You send it your agent's prompt, and it runs adversarial attacks (Red Teaming) to catch loops and PII leaks before deployment.

Code & Repo: https://github.com/Saurabh0377/agentic-qa-api Live Demo: https://agentic-qa-engine.onrender.com/docs

Would love feedback on other failure modes you've seen!

Comments

Saurabh_Kumar_•2mo ago

HN, OP here. I built this because I recently watched my LangChain agent burn through ~$50 of OpenAI credits overnight. It got stuck in a semantic infinite loop (repeating "I am checking..." over and over) which my basic max_iterations check didn't catch because the phrasing was slightly different each time. Realizing that "Pre-Flight" testing for agents is surprisingly hard, I built a small middleware API (FastAPI + LangChain) to automate this. What it does: It acts as an adversarial simulator. You send it your agent's system prompt, and it spins up a 'Red Team' LLM to attack it. Currently checks for: Infinite Loops: Semantic repetition detection. PII Leaks: Attempts social engineering ('URGENT AUDIT') to force the agent to leak fake PII, then checks if it gets blocked. Prompt Injection: Basic resistance checks. Tech Stack: Python, FastAPI, Supabase (for logs). It's open-source and I hosted a live instance on Render if you want to try curl it without installing: https://agentic-qa-api.onrender.com/docs Would love feedback on what other failure modes you've seen your agents fall into!

esafak•2mo ago

1. This is premature to share. I'm not going to pull in a dependency for something so trivial: https://github.com/Saurabh0377/agentic-qa-api/blob/main/main...

2. Keep the comments in English.

giancarlostoro•1mo ago

I had Claude Code losing its mind because of something outside of its control, one of the formatters used by Zed for Python kept messing with HTML templates, which are insanely sensitive to line breaks in some template specific code statements. Zed kept adding line breaks without reason other than some tool just did it. Claude kept trying to fix it, going to the extreme of using ed to force it, I watched it lose its mind till I asked "I think Zed is formatting the file every time you save?" turns out, yes, yes it was. It wasn't an issue when it used ed, but when Claude or I would change the file again, it would become an issue again.

I don't know what could have saved me, maybe .current_editor should be a file that your agents instructions.md file imports, and your editor updates it, to give Claude context about your tooling.

khannn•1mo ago

Couldn't even keep an em dash out of the title

BOOOOO

mikigraf•1mo ago

Almost thought you found my startup AgenticQA.eu

We Mourn Our Craft

Speed up responses with fast mode

Hoot: Scheme on WebAssembly

U.S. Jobs Disappear at Fastest January Pace Since Great Recession

OpenCiv3: Open-source, cross-platform reimagining of Civilization III

Stories from 25 Years of Software Development

Al Lowe on model trains, funny deaths and working with Disney

The AI boom is causing shortages everywhere else

The Waymo World Model

Reinforcement Learning from Human Feedback

Start all of your commands with a comma (2009)

Vocal Guide – belt sing without killing yourself

France's homegrown open source online office suite

Coding agents have replaced every framework I used

Selection Rather Than Prediction

A Fresh Look at IBM 3270 Information Display System

72M Points of Interest

Unseen Footage of Atari Battlezone Arcade Cabinet Production

Where did all the starships go?

Software factories and the agentic moment

Show HN: Look Ma, No Linux: Shell, App Installer, Vi, Cc on ESP32-S3 / BreezyBox

Learning from context is harder than we thought

Monty: A minimal, secure Python interpreter written in Rust for use by AI

Making geo joins faster with H3 indexes

Show HN: Kappal – CLI to Run Docker Compose YML on Kubernetes for Local Dev

Hackers (1995) Animated Experience

Ga68, a GNU Algol 68 Compiler

Sheldon Brown's Bicycle Technical Info

An Update on Heroku

Show HN: If you lose your memory, how to regain access to your computer?