Firecracker - GoKawiil

Researchers reverse-engineer Claude Code Web's hidden Firecracker-based hosting platform

Engineers building the ArcBox sandbox platform used standard Linux debugging tools like strace and objdump inside a live Claude Code Web session to inspect its runtime. They discovered the environment runs on Firecracker microVMs, identical to the technology behind AWS Lambda and Fargate, complete with hardcoded ACPI signatures, minimal 4-vCPU/16GB instances, and an unstripped Go binary called environment-manager pointing to a previously undocumented Anthropic internal deployment platform.

aprilnea.me · 2026-09-11

Claude Code and Instinct run mobile AI agents inside dedicated microVMs

Coding assistants like Claude Code, Instinct, and Poke are shifting from local machines to cloud-hosted virtual machines so they can be accessed from phones. Inspection of Claude Code's setup shows it runs inside a Firecracker microVM with a custom Rust-based init process controlling the session over a vsock connection, while inference calls go out through a locked-down, MITM'd egress gateway to Anthropic's servers.

rohanadwankar.github.io · 2026-09-08