ENOSPC: no space left on device

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Cowork sessions fail with ENOSPC: no space left on device errors. The VM disk fills up before any user work begins, making the session unusable.

Error example:

ENOSPC: no space left on device, mkdir '/sessions/determined-stoic-clarke/tmp/claude-1028'

What Should Happen?

Root cause
The VM disk is consumed by pre-loaded content:

Plugin caches at /mnt/.local-plugins/cache/knowledge-work-plugins/ — multiple versions of plugins (legal, marketing, product-management, sales, finance, data, bio-research, brand-voice, etc.) with skills, references, and example files
Built-in skills at /mnt/.skills/skills/ (pdf, docx, pptx, xlsx, etc.)
Once the disk is full, even basic bash commands fail (shell needs temp space to start), so there's no way to recover from within the session.

Error Messages/Logs

Steps to Reproduce

Reproduction
Start a new Cowork session on a project with moderate size (~300MB including media assets)
Session either starts full or fills up quickly
All commands fail with ENOSPC
Attempted fixes
Restarting the session — same issue on fresh VM
Creating a new session entirely — same result
Added .claudeignore to reduce project sync size — didn't help since bloat is VM-side, not project-side
Expected behavior
Cowork VMs should have enough disk headroom for the pre-loaded plugins + user workspace + temp files. Old plugin cache versions should be pruned.

Environment
macOS (Darwin 24.6.0)
Claude Code (latest)

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.78 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_