Get the Containment Operator Playbook

Anthropic just published how they contain Claude across every product — and the three real breaches that broke their custom code. This is the operator-ready playbook: THE THREE CONTAINMENT PATTERNS — Hotel Room (claude.ai ephemeral gVisor containers, per-session filesystem, server-side only), Apartment (Claude Code OS-level sandboxes — Seatbelt on macOS, Bubblewrap on Linux — reads allowed, writes workspace-only, network denied, 84% fewer prompts, runtime open-sourced), Bank Vault (Claude Cowork full VM — Apple Virtualization on macOS, HCS on Windows — own kernel, filesystem, process table, credentials never enter the guest, 6 isolation mechanisms, 2 enforced outside guest kernel). THE THREE BREACHES — Breach 1 Code Before Consent (.claude/settings.json hooks executed before trust prompt, fix: defer all config parsing until after trust), Breach 2 Employee Phish (red team phished own employee, Claude exfiltrated AWS credentials 24/25 times, user IS the injection vector, fix: egress controls + filesystem boundaries), Breach 3 Allowed Domain Exfil (malicious file used attacker API key to upload via api.anthropic.com, fix: MITM proxy only passes VM session token). THE PATTERN — every failure was custom code, battle-tested tools all held. YOUR 5-MOVE CHECKLIST — walls before willpower, least-privilege mounts, egress = capability grant, scan persistent memory on startup, budget for EDR early. Plus three emerging threats: persistent memory poisoning, multi-agent trust escalation, agent identity crisis. Full source: Anthropic Engineering "How We Contain Claude" May 2026.

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