Claude Fable is relentlessly proactive

· · June 11, 2026, 11:37 p.m.
Summary
The author discusses their experience using Claude Fable 5, an AI coding agent, which demonstrated remarkable abilities by autonomously debugging a CSS issue in their project, Datasette Agent. The post illustrates the proactive nature of Fable, including its methods for diagnosing problems, performing tasks like taking screenshots, and running JavaScript for data analysis. While the capabilities of Fable are impressive, the author also raises concerns about security risks associated with running such powerful agents outside a controlled environment.
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