Agent browser silent failures: tool returns success but side effect never lands
Downtown_Item_9996 · reddit · 2026-08-11
A developer shares debugging experiences with an agent-driven browser, highlighting silent failures where tools report success but no effect occurs. Examples include Reddit form submission blocked by reCAPTCHA, media upload API resolving before preview hydration, editor normalizing newlines causing comparison failures, and CLI wait command dropping the session. The author emphasizes that the most dangerous failures are not crashes but operations that return success without the side effect, and suggests asserting actual effects after tool calls.
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