A lightweight VS Code extension that automatically folds code when you open a file, so the main structure fits on one screen (~40 lines). Originally designed to boost efficiency for handwritten code, it is now also a powerful assistant for reviewing code in Vibe Coding.
Open any file – the extension will auto-fold deeper blocks to show the high-level structure
If needed, run "B9AutoFold: Refold Current File" from the Command Palette to reapply folding
Features
Out-of-the-box: no settings required
Great Helper for Reviewing AI-Generated Code: Automatically keeps uncommitted changes (git diff) unfolded. When AI agents modify your code, you see exactly what changed while the rest remains folded—perfect for efficient reviews.
Uses the editor's Document Symbols (Outline) to plan folding for any language that provides them
Fallback to "Fold Level 2" when symbols are not available
Respects your current selection: selected regions are avoided during folding
Skips short files (under ~40 lines) to prevent unnecessary folding
Special handling for test files: keeps describe blocks visible while folding individual tests when space is tight
Commands
B9AutoFold: Refold Current File – Unfolds everything, then reapplies the folding plan for the current editor
B9AutoFold: Export Symbols for Debugging – Copies symbol info and the computed folding plan to the clipboard to help investigate unexpected folding
Configuration
B9AutoFold works out-of-the-box, but you can customize the uncommitted changes behavior:
B9AutoFold.uncommittedChanges.enable: Enable/disable "do not fold uncommitted changes" (default: true).
How It Works
The extension retrieves Document Symbols and computes a folding plan starting from deeper symbols first, aiming to reduce visible lines to about 40
When a language does not provide symbols, it falls back to VS Code's "Fold Level 2"
Folding avoids regions you have selected in the editor
It only triggers on file open/activation and when you manually run the refold command
Limitations and Notes
Works best for languages that support Document Symbols (Outline view). For others, it uses a simple level-based fold
When reapplying folding, the extension may unfold all first to ensure clean results
Very large files or unusual symbol providers may lead to conservative folding
Privacy & Performance
No telemetry, no network calls – all logic runs locally using VS Code APIs
Minimal performance impact: folding is calculated once on open/activation and on manual refold
