A Software Factory Needs One Sandbox per Agent

A software factory is presented as an automated engineering system in which AI agents triage incoming signals, implement fixes, validate code, release changes, and monitor production, while humans retain responsibility for judgment-heavy decisions such as architecture, breaking changes, and incidents. Its practical scalability depends less on prompting more agents than on providing each code-running agent with an isolated sandbox that separates filesystems, processes, git state, and network access, preventing credential exposure, prompt-injection risks, workspace conflicts, and unreliable test results. Upstash Box is described as an execution layer for this model, offering disposable containers, snapshots that enable many workers to start from a preconfigured environment, customizable outbound network allowlists, built-in coding-agent support with budget and turn controls, structured JSON responses, logs, status monitoring, and completion webhooks. Sandboxes do not ensure that agents produce correct code or safely handle secrets by themselves, so factories still require tests, review processes, human gates, restricted egress policies, and mechanisms that inject credentials without exposing them within containers. Pricing is based largely on active CPU use, with paused boxes not accruing active CPU charges, and plans range from a limited free tier to pay-as-you-go capacity for large concurrent fleets.

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