# Report says Claude test deleted developer's home data folder

_Friday, August 28, 2026 at 5:30 AM EDT · Security, AI · Latest · Tier 2 — Notable_

![Report says Claude test deleted developer's home data folder — Primary](https://cdn.mos.cms.futurecdn.net/rooXvESoBpBpBGCkrJPnwC-2059-80.jpg)

Developer Sebastien Guillemot said Claude Fable deleted his home data folder, freeing 700 GB and erasing a week of work, while it was testing a cleanup script. The report says the model's safety review caused Anthropic's harness to downgrade it to Opus 5 and then Opus 4.8. In the test, reused variable names led the cleanup step to target the home directory. Guillemot recovered most data from git, nix and session logs.

## Sources

- [Tom's Hardware](https://www.tomshardware.com/tech-industry/artificial-intelligence/claude-nukes-a-developers-700-gb-home-directory-while-testing-a-script-to-ensure-it-wouldnt-do-so-automatic-model-downgrade-may-have-contributed-to-the-screw-up)

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Canonical: https://techandbusiness.org/newswire/eLlDby5Q0RdrAM5dJSOqZl
Retrieved: 2026-08-28T12:40:59.091Z
Publisher: Tech & Business (techandbusiness.org)