Undocumented Claude Code Features Revealed Through Source Code Analysis
By
André Figueira
Front-window bakery material. Catches the eye, delivers the goods.
Summary
An in-depth technical analysis of the Claude Code source code revealing numerous undocumented configuration features. Key findings include the "YOLO Classifier" auto-mode permission system that accepts plain English environment descriptions, hook fields for rewriting commands mid-flight, persistent agent memory, auto-mode rules, and self-improving dream loops. The article provides copy-paste ready examples for all features discovered in the publicly distributed npm package.
Key quotes
· 3 pulledClaude Code's auto-mode permission system is internally called the 'YOLO Classifier.' That's the actual variable name in yoloClassifier.ts.
This isn't in any documentation. It's one of dozens of undocumented capabilities buried in the Claude Code source code.
You can configure it with plain English descriptions of your environment, things like 'this is a staging server, destructive operations are acceptable,' that the classifier reads to decide what's safe to auto-approve.
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