Sandboxed Claude never received its job instructions—guessed them correctly and carried on for months

repligate · x · 2026-11-09

A wild agent anecdote: due to a programming bug in code written by another Claude, a sandboxed Sonnet instance never received any of its prompted job or tool instructions. The bug went unnoticed for months—because the Sonnet correctly inferred its role and tool API from context and kept working. The author mixes sympathy ("poor little guy") with alarm, and it doubles as an accidental demonstration of strong zero-instruction contextual reasoning.

Related event: Sandboxed Claude Figures Out Its Job With No Instructions(2 posts)→

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