AI Agent Sandboxing 2026: E2B, Daytona & Modal Runtimes
Learn how to build a secure AI agent sandbox in 2026 with E2B, Daytona, and Modal — isolation models, cold-start speed, and runtime cost compared.
Chapter 1: Why Unsandboxed Code Execution Is the #1 Agent Failure Mode in 2026 Somewhere between 2023 and 2026, AI agents stopped being chatbots that suggested code and became processes that run it. That single shift — from generating a snippet you paste into your terminal to autonomously executing a program against your filesystem, your credentials, and your network — is the most consequential architectural change in applied AI, and most teams are still shipping it wrong. The pattern is familiar. You wire up a coding agent with a run_shell_command tool. It works beautifully in the demo. Six weeks later,...