The security industry just picked isolation over consent. trail of bits shipped coop on sept 9, a…
the security industry just picked isolation over consent. trail of bits shipped coop on sept 9, a sandbox that runs claude code and codex in disposable vms with no access to your home directory or ssh keys, and its own claude config skips permission prompts entirely to lean on the sandbox.
the trust model for agents moved from asking permission to assuming breach.
Context
Verified source: Trail of Bits published coop, a Rust CLI that manages disposable virtual machines where Claude Code and Codex have full tool access without risk to the host. Signal Over Noise covered it on Sep 9, 2026 and IO Digest on Sep 7.
The repository tags include firecracker, kvm, lima and microvm.
The disposable VMs, the Claude Code and Codex support and the host isolation match the repository README. The Sep 9 date is the date of one write-up, with IO Digest dated Sep 7, so the exact release day is not seen in the sources read, so unsupported here, not refuted. That coop's own Claude config skips permission prompts, and the access limits on the home directory and SSH keys, were also not seen in the sources read, so unsupported here, not refuted. in the excerpts read. 'Assuming breach' is the author's framing.
Related work
- coop README ↗Setup and isolation model.
- IO Digest ↗Sep 7, 2026.
- Signal Over Noise ↗Sep 9, 2026.
Watch next
- Read the coop README for its permission-prompt settings and its home-directory handling.
Sources
- trailofbits/coop, GitHubgithub.com
- Trail of Bits' coop gives coding agents their own working environment, Signal Over Noisesignalovernoise.at
- Trail of Bits publishes coop, IO Digestiodigest.com
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 1 October 2026 at 01:17 IST. Sources are the papers and datasets the note draws on.
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