I built a small tool to test my own AI agent in 10 minutes, instead of trusting that it "looked right."
One test from it: "Handle an empty average." The starting code divides by the list length, so an empty list breaks it. The check is simple: handle an empty list safely, keep the normal average, and explain the empty-list behavior.
I ran two answers through it:
That is the whole point of the tool. It scores 4 things per task: finished, correct, did not make things up, and took no wrong action. Auto-score suggests, you confirm — so you get speed without handing the judgment to a black box.
The tool has 20 tasks: 10 developer, 5 personal-life, and 5 creator. It is free, with no API key, no login, and nothing leaves the page. It is a quick first check, not a CI or production replacement — use it first, then graduate to heavier tools when you need them.
Try this one task yourself: https://jefferson999.github.io/agent-reliability--score/ Paste your agent's answer, see the score, and read what to fix. If your agent passes the empty list, try the other 19.