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Source-linked reports: Amounts and outcomes come from the original reports and linked replies.

Durable Objectslion-brain-durable-object-alarm-loop

Lion Brain: a Durable Object alarm loop from an AI-coding bug wrote about 250 million rows, roughly $210.

Replying in another user's Community thread, bennygoldstein says a bug written by an AI coding tool made a Durable Object alarm in their Lion Brain app re-index the same data every few seconds on October 10 and 11, 2026, writing about 250 million rows and costing roughly $210 in overage on Workers Paid. He says he only found out from the budget alert email, which never pauses anything, and that he opened a billing case asking for a one-time courtesy credit and a real hard spending cap.

What happened

Reported cause
Unbounded loop
Incident date
2026-10-10
First reported
2026-10-12
Billing outcome
Request submittedAuthor-reported
Case progress
Not established
Public Cloudflare reply
Not linked

Latest reported outcome

The author says he opened a billing case asking for a one-time courtesy credit and a hard spending cap and is still waiting for a reply.

View this update in the timeline

Original sources

Each entry links to the report or reply it describes.

Case timeline

  1. Author reports the alarm loop and asks for credit

    Open original source

    The author says an alarm loop wrote about 250 million rows over October 10 and 11, roughly $210 in overage, that the budget alert email did not pause anything, and that a billing case asks for a courtesy credit and a hard spending cap.

Community resourceWorkers +3

Cloudflare Cost Guard: a read-only agent skill for runaway-billing audits

Layer Cache’s open-source agent skill, announced by Domenico (@purposelyblnk), audits a Cloudflare codebase from source alone for paths that can run up uncontrolled billable usage, and reports findings without changing code or calling Cloudflare.

Workers

A voting page polling every three seconds: the author revises a $1,000 report.

@keking99 first reports about $1,000 for a voting page polling /api/result every three seconds. A later post reports $816.52 in accumulated usage as of October 4 and cites another screenshot total of $817.14. He later says his support ticket keeps being refused.

Author experienceWorkers +5

Four layers of cost protection for small Cloudflare projects

David Z (@davezfr) writes an X article for vibe coders on budget alerts, stop conditions for paid paths, automatic pausing, and letting a personal agent verify and pause.