ProveRun is a Blast Radius Zero (Pattern A) web agent for Vultr Agent Rush. A user asks a question in the browser (optionally with a CSV); Vultr Serverless Inference writes Python; the code runs in a disposable Docker sandbox with no network, memory and time caps, dropped capabilities, and a read-only root. Real stdout returns to the model for a short explanation. Secrets stay in the API process and never enter the sandbox. The control plane runs on a Vultr Cloud Compute VM. Live demo: http://140.82.0.23:8787 — Public GitHub: https://github.com/happy-star/proverun — Judges can use the in-app containment test: network probes, secret reads, and host writes fail while the host canary stays unchanged.
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