Developer spent $11,922 on Cursor in under four weeks
A developer ran six Cursor windows in parallel, each pointed at a different project with autonomous agents. Context length and token costs compounded across two billing cycles ($4,339 then $7,583), with a single premium model accounting for over $9,400.
An agent ran without supervision while the operator was asleep or away, accumulating charges for hours. The fix is a time-of-day rule and a hard daily cap. time-of-day + daily total would have rejected or flagged this transaction before any money moved.
max_amount_usd: 500
daily_max_usd: 200
category: compute, daily_max_usd: 50
block_after: "22:00", block_before: "07:00"
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What happened
A developer ran six Cursor windows in parallel, each pointed at a different project with autonomous agents. Context length and token costs compounded across two billing cycles ($4,339 then $7,583), with a single premium model accounting for over $9,400.
The root cause was classified as Unattended / overnight session. An agent ran without supervision while the operator was asleep or away, accumulating charges for hours. The fix is a time-of-day rule and a hard daily cap.
This is one of 14 documented incidents in the open registry. Every entry is sourced to a public URL; amounts and dates are as reported by the source.