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boxd.sh and Flue, the agent harness framework Flue is the agent harness framework from Fred K. Schott, known from Astro. It feels like Claude Code, but fully headless and programmable in TypeScript. Flue agents can opt into a full sandbox, and the boxd connector gives each agent its own Linux VM:
You own the machine’s lifecycle through the TypeScript SDK, and the connector adapts it to Flue’s sandbox interface. The connector is written so a coding agent can install it into your Flue project, and Flue’s own docs cover it under sandboxes.