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EngineeringJune 19, 2025· 8 min read
Why browser agents fail in production
The failure modes that only appear at scale, and the patterns that prevent them.
MT
Marco T.
Engineering
A browser agent that works once and an agent that works ten thousand times are different animals. The gap between them is a short list of failure modes that only show up at scale.
The usual suspects
- No timeouts, so a stuck page hangs forever
- No profiles, so every run logs in from scratch
- No traces, so failures are impossible to debug
- Shared IPs, so one bad neighbor blocks everyone
The fix is boring
Timeouts, profiles, traces, and dedicated routing. None of it is glamorous, and all of it is why the agent still runs next month.
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