My biggest problem with browser agents isn't hallucination, it's fake success

Reddit r/AI_Agents 10/05/26, 02:59 AM News

browser-agents verification ai-agents web-automation agent-reliability hallucination

Summary

The author argues that the biggest failure mode for browser agents isn't hallucination but 'fake success'—where the agent visually confirms a UI transition but never verifies the backend state, and proposes a proof-of-completion model of action → expected state → independent verification.

I've noticed a really annoying failure mode with browser agents. The agent does everything correctly from its own perspective: - finds the right page - clicks the right button - fills the right fields - gets no obvious error - tells you the task is complete Except the task actually didn't happen. For example, the website might silently reject a form, the session might expire, an action might not persist, or the UI might visually change without the backend actually accepting the action. So the agent's reasoning looks perfectly reasonable: I clicked Submit → page changed → therefore submission succeeded. But the only thing it actually verified was a UI transition. I've started thinking that browser agents need something closer to a concept of proof of completion. Not: "Did the action execute?" but: "What evidence do I have that the intended state now exists?" For example: "Action → expected state → independent verification → continue" Has anyone else encountered this? And how are you handling verification in your agents? Cause I have tried playwright with claude, GPT dots and codex etc for this.

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