Show HN: Handler – Open-source local sandboxes and control plane for code agents

Category: devtools

Tags: ai-agents, sandbox, self-hosted, firecracker, devops

Score: 7.5/10 (Innovation: 7, Technical: 8, Documentation: 8, Utility: 7)

Handler is a self-hosted control plane for creating isolated sandboxes (Docker containers, Firecracker microVMs, cloud VMs) through a unified API and UI, designed specifically for AI coding agents. It's interesting because it solves the security and isolation problem for AI agents that need to execute code, while providing advanced features like persistent tmux sessions, AI-classified terminal activity, and a visual canvas workspace for supervising multiple concurrent agent sessions.

Target audience: devops, backend devs, ai engineers

Repository: https://handler.dev · TypeScript · MIT

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