Your disk is full.

Models, caches, and forgotten worktrees. One report with sizes and cleanup guidance, ready for you or your coding agent.

Download the app Install the skill

Paste into your local coding agent.

Free & open source. Runs locally. No automatic deletion.

An exploded 3D donut illustrating the mix of developer tools that occupy disk space.

It all adds up.

Find the leftovers from the tools you use every day.

AI models

Ollama
LM Studio
Hugging Face
PyTorch & Whisper

App & web caches

Adobe Camera Raw
Spotify
Google Chrome
VS Code

Package stores

npm & pnpm
pip & uv
Cargo
Homebrew

Build tools

Xcode DerivedData
iOS Simulators
Playwright
Electron

Containers

Docker VM images
WSL2 virtual disks

Agents & worktrees

Codex
Claude Code
Cursor
Windsurf

See all supported locations ↗

Find it. Understand it. Clear it.

1 Run a report.

Find bulky caches, models, and worktrees.
2 See what can go.

Get sizes, context, and cleanup guidance.
3 Reclaim space.

Let your agent work through the report, or follow it yourself.

For your agent

npx whyfull --json

For you

npx whyfull

Install the agent skill.

Give your agent the same local reports you can explore in the app. Run this command and choose your agent.

npx skills add iplanwebsites/whyfull --skill whyfull

Download SKILL.md ↗

View agent prompt

Agent prompt

Help me reclaim disk space on this computer using Whyfull (https://whyfull.app).

Use an installed whyfull command to run whyfull --json. This can be the CLI installed from the desktop app or a standalone installation. Otherwise, run npx --yes whyfull@latest --json. If neither command or filesystem access is available, explain what is needed. The report covers known tool locations, discovered caches, and Git worktrees; it is not a full-drive inventory.

Prioritize the largest useful cleanup opportunities. Explain what created the data, the safety tier, and the recommended tool-specific cleanup method. Account for overlapping measurements and incomplete scans; measured usage is not guaranteed reclaimable space.

Investigate the findings and propose a concrete plan. Use the owning tool’s cleanup commands where appropriate. Carry out cleanup within permissions I have already given you. Ask before deleting personal data, removing worktrees with uncommitted work, or making choices about models, environments, or projects I may still need. If cleanup is not already authorized, ask me to approve the plan first.

Keep paths and report contents private. If visual inspection would help, suggest the desktop app or whyfull --view (npx --yes whyfull@latest --view if using npm). After approved cleanup, run the report again and summarize what changed.

Your disk. Your decisions.

Does Whyfull delete anything?

Scanning doesn’t delete anything. Cleanup is a separate action you control; the optional viewer Trash feature requires confirmation.

Is every gigabyte reclaimable?

No. Some files matter; some caches cost time to rebuild. Whyfull helps you decide what to keep.

Where does the report go?

Whyfull runs locally. You choose what to share with your agent; reports can include private paths.

Go further. Open any folder.

The app and CLI include the same local disk viewer. Drill into folders, compare their sizes, and find what’s worth clearing out.

Radial chart showing folders as nested rings — Follow the space.

Move through folders with the radial view.

Treemap comparing the relative sizes of folders — See what’s biggest.

Compare directories at a glance with the treemap.

Or open the viewer from your terminal:

npx whyfull --view

One tool for you and your agent.

Start with a prompt, install the skill for future runs, or explore visually in the app. The desktop app includes the CLI.

Free. Private. Open source.