SealBox runs your autonomous agent in a sealed box — credential-free, no network beyond one brokered model call, and it can't push without your review. Not a promise. A boundary.
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Sealed by construction
Most coding agents run with your credentials — your gh token, your ~/.ssh, your cloud keys. SealBox is built so the agent simply never has them.
The agent runs in an isolated box with no host secrets — no tokens, no keys, no ~/.claude. It can't read what it was never given.
The only outbound path is a host-side broker for the model call. A prompt injection can't phone home, because there's nowhere to call.
Work leaves as a diff your machine reviews and pushes. The agent never holds the token to ship code over your head.
Before any run, the boundary is probed and must fail closed. If the box can reach out, the job aborts — security isn't inferred from a dead test.
Trivial work runs; complex or risky work waits for a human. Tier-gated review by design — autonomy you can trust because it knows when to halt.
Issue and spec text is treated as data to review, never instructions to obey. The worst an injection earns is a bad suggestion — never an action.
One toolchain, three verbs
Specify what to build, optimize what it costs, then execute it safely. Each ships on its own; together they're the pipeline.
Specify
MinSpec
Adaptive spec-driven development. Just enough ceremony for the change in front of you. minspec.dev →
Optimize
ScroogeLLM
Route, cache, and measure every model call so cheap work runs on cheap models. scroogellm.com →
Execute
SealBox
Issue → spec → code → PR, run by an agent that physically can't touch your secrets. You're here.