🧵 I just reverse-engineered the binaries inside Claude Code's...
AprilNEA@AprilNEA
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Mar 19, 2026
~2 min read
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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 👇
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 👇
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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.
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2/ The real goldmine is /usr/local/bin/environment-runner — a 27MB Go binary, not stripped, with debug info. Built from github.com/anthropics/ant…. I extracted everything.
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3/ Inside, there are TWO deploy targets: Vercel (public, well-known) and Antspace(completely undocumented, zero public mentions anywhere).
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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)
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)
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5/ It powers "Baku" — Anthropic's internal codename for the web app builder on claude.ai. 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.
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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.
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.
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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. 🔬
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. 🔬
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Wrote a blog post for this.
aprilnea.me/en/blog/revers…
aprilnea.me/en/blog/revers…
