Terrarium launches a local VM for AI agents with explicit permissions
11/07/2026 — 11/07, 22:18·1 sources (all)·1 reports (all)
Key takeaways
- A developer launched Terrarium, a local persistent Linux VM approach for running AI agents. Each box is defined by a YAML recipe that allows…
- restrictions apply to all processes inside the VM, including tools and scripts the agent invokes.
Background & analysis
On November 7, 2026, a developer posted in the Reddit r/LocalLLaMA community about Terrarium, a self-built local virtual machine sandbox for running AI agents. According to the post, the developer wanted a secure way to run AI agents against local models without handing over the whole machine. He said the existing solutions he found tried to do too much, so he built Terrarium himself. The approach is said to be in the spirit of pi: simple, narrow in scope, auditable, yet flexible. Terrarium runs agents in persistent Linux VMs ("boxes") on the machine. A YAML recipe declares which host folders a box may read or modify and which network destinations it may reach; everything else is blocked. These restrictions apply to every process inside the VM, including the agent itself and any tool or script it invokes. As of now, this Reddit post is the only available source on Terrarium, and no further developments are documented in the material.
AI-generated from 1 reports · updated 3 hours ago
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A developer has released Terrarium, a tool that runs AI agents in persistent Linux VMs on the local machine instead of handing them the whole host. A YAML recipe declares which host folders each box may read or modify and which network destinations it can reach, and everything else is blocked for every process in the VM, including the agent and any tool or script it launches.
Reddit · LocalLLaMAAI score 54
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