Engineering notes on the agent runtime you own.
v0.4 turns receipts into artifacts a human can read, verify, and own: keep doctor, keep story, proof packs anyone can verify, a nightly self-attack in public, and the Open Work Receipt standard.
Keep is a self-hosted E2B alternative: sandboxes with $0 idle cost, sealed secrets, receipt chains, and prepaid credits with a hard circuit breaker.
How to run agent sandboxes on your own VPS: process and container isolation, per-domain egress gateways, KVM microVMs, and billing that stops when you stop.
With a former open-source dev-environment platform going closed source, Keep offers a genuinely open, self-hosted agent runtime: your VPS, your keys, your receipts.