Engineers… Your Software Factory NEEDS Agent Sandboxes to SCALE (exe.dev)

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• To scale software factories with AI agents, engineers must move out of the loop and stop renting their machines to agents; instead, each agent needs its own isolated, ephemeral “agent sandbox” to achieve true isolation, scale, and autonomy.
• The “Factory In A Box” model places the entire software development workflow inside these sandboxes, managed by a three-tier architecture, ensuring security with “disposable keys” (e.g., OpenRouter API keys with spend caps) that are revoked upon teardown, creating a “bounded blast radius.”
• Leverage “Best of N” by running multiple agent configurations (“Model Stack, Not Model”) in parallel sandboxes against a single prompt to pick the optimal outcome and gather cost/quality data, distinguishing this “agentic engineering” from “vibe coding.”
• Engineers should focus on the planning and reviewing stages, letting the automated “Mount, Run, Teardown” system handle execution, while utilizing live observability views to monitor agent performance and token spend for continuous improvement.