Agentbox is an open-source agent harness and isolation orchestrator created by Marco Madarco. It provides structured runtime sandboxes and host-agent bridging mechanisms designed to run AI coding assistants, such as Claude Code and OpenAI Codex, with controlled access to host resources. In standard workflows, Agentbox operates through a CLI utility and installable skills for host-side agents. It configures execution sandboxes for coding agents, provides host relays for operations such as Git interactions, and supports queuing agent tasks in the background. Developers prepare environments using provider-specific commands and dispatch coding agents into designated target sandboxes. Agentbox differentiates itself by focusing on the harness and isolation layer rather than building a proprietary model agent. It treats agents as modular workers, enabling host-side tools, background processing queues, and native plugin integration for major agent interfaces while keeping the development host safeguarded. Agentbox is open-source software distributed on GitHub, actively maintained with plugin integrations for both Claude Code and Codex ecosystems.
Tags: agent harness, ai agent, cli, coding agent, developer tools, OpenSource