Browser agents' worst failure mode isn't hallucination, it's fake success
Comfortable_Oven6576 · reddit · 2026-10-05
A Reddit developer describes a frustrating browser agent failure mode: the agent finds the right page, clicks the right button, fills the right fields, sees no error, and declares the task complete—yet nothing actually happened. Silent form rejections, expired sessions, and unpersisted actions mean the agent only verified a UI transition, not real state: "clicked Submit → page changed → therefore success" is plausible-sounding but fragile reasoning.
The author argues browser agents need a concept of "proof of completion"—asking not "did the action execute?" but "what evidence do I have that the intended state now exists?"—following an "action → expected state → independent verification → continue" loop. They've hit this with Playwright combined with Claude, GPT, and Codex, and are soliciting verification approaches from the community.
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