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🧵 I just reverse-engineered the binaries inside Claude Code's Firecracker MicroVM and found something wild: Anthropic is building their own PaaS platform called "Antspace" (Ants + Space). It's a full deployment pipeline — hidden in plain sight inside the environment-runner binary. Here's what I found 👇
1/ Claude Code runs inside a Firecracker MicroVM. PID 1 is /process_api — a custom init + WebSocket API server. ACPI tables are literally signed "FIRECK". No systemd, no sshd, nothing. Just a bare kernel + one binary.
2/ The real goldmine is /usr/local/bin/environment-runner — a 27MB Go binary, not stripped, with debug info. Built from <a target="_blank" href="http://github.com/anthropics/anthropic/api-go/environment-manager/" color="blue">github.com/anthropics/ant…</a>. I extracted everything.
3/ Inside, there are TWO deploy targets: Vercel (public, well-known) and Antspace(completely undocumented, zero public mentions anywhere).
4/ Antspace has a full deployment protocol: POST to create deployment Upload dist.tar.gz via multipart/form-data Stream NDJSON status: packaging → uploading → building → deploying → deployed Own auth system (Bearer token + dynamic control plane URL)
5/ It powers "Baku" — Anthropic's internal codename for the web app builder on <a target="_blank" href="http://claude.ai" color="blue">claude.ai</a>. When you say "build me a web app," it spins up a Vite + React + TypeScript template with auto-provisioned Supabase DB and 6 MCP tools.
6/ The strategic play is clear: Natural language → Claude builds app → Deploys to Antspace Idea to production without ever leaving Anthropic's ecosystem. An AI-native PaaS with full vertical integration from model to runtime to hosting.
7/ This puts Anthropic in direct competition with Vercel, Netlify, Replit, Lovable, and Bolt — but with one advantage nobody else has: they own the entire stack from the LLM to the deployment platform. All discovered via strace, objdump, and go tool objdump on a running Claude Code session. The binary was right there, unstripped, waiting to be read. 🔬
Wrote a blog post for this. <a target="_blank" href="https://aprilnea.me/en/blog/reverse-engineering-claude-code-antspace" color="blue">aprilnea.me/en/blog/revers…</a>