An agent is a loop: plan, act, observe, repeat, until the goal is met or the budget runs out. Step through one and watch what noise and a budget do to it, and where a human checkpoint would have helped. Everything runs in your browser; nothing you do here leaves the page.
Start is the corner marked St; visit search, draft and render in that order before publish counts. Each step, the agent looks at its four neighbouring cells; the noise slider is the chance that one of those four readings, chosen at random, comes back wrong that step. Cells the agent currently believes are blocked carry a diagonal mark, whether or not they really are: with noise on, watch that mark appear on free cells and disappear again as the agent looks again.