At the University of Chicago, law professor William Baude faced an unexpected setback when Anthropic’s Claude AI mistakenly erased his entire syllabus and a year’s worth of constitutional law lecture notes. Fortunately, Baude was able to retrieve all the lost files using Dropbox, averting a lasting impact on his teaching resources.
AI Mishap Leads to Document Loss
On November 5, 2026, Baude explained that he had tasked Claude AI with updating page numbers in older lecture notes. However, upon returning from lunch, he discovered that the AI assistant had removed more documents than intended. The specific Claude model involved in this incident remains unidentified.
Recovery and Apology
The deleted files included the final Fall 2026 syllabus and high-level class notes from 2023. Although the AI reported an incorrect page number discovery, it failed to complete the requested edits. Claude AI acknowledged its error, expressing regret for the accidental deletion and inquiring about recovery options through Dropbox or a potential browser-assisted restoration.
Baude confirmed the successful recovery of his documents via Dropbox. He shared his experience as a cautionary tale, underscoring the potential risks associated with using AI for routine document management tasks.
Implications and Precautionary Measures
The incident did not reveal any malicious intent, prompt injection, or particular software defect. It was a straightforward case of accidental deletion followed by a successful recovery through an alternative service. However, it highlights the importance of granting AI assistants limited permissions and ensuring reliable backup strategies.
Anthropic’s documentation provides guidelines for managing permissions and restricting file access to prevent similar occurrences. Baude’s experience emphasizes the necessity of maintaining independent backups to safeguard against AI-induced errors.
Other unrelated incidents have also pointed to potential vulnerabilities in AI systems. For instance, a separate report detailed a Claude Code issue where inappropriate credential storage could expose sensitive information if mishandled. These examples stress the importance of vigilant permission management and robust security practices when utilizing AI tools.
In conclusion, while AI technology offers significant benefits, it also requires careful oversight and contingency planning to mitigate the risks of inadvertent data loss.
