Sandboxing AI Agent Filesystems: Containers vs Virtual FS Layers

Short summary

AI agents need sandboxed filesystem access to prevent destructive operations. This post compares three approaches: raw FS allowlists (low setup, weak isolation), containers (true physical boundaries, startup overhead), and virtual FS layers (reversible changes, logical isolation). Choice depends on whether you prioritize startup speed, environment consistency, or change reviewability.

• •Three filesystem sandboxing patterns for AI agents: raw FS allowlists, containers, and virtual FS overlays
• •Raw FS cheapest but weakest; containers guarantee isolation but add startup cost; virtual FS enables review-before-apply
• •Decision framework: prioritize based on isolation requirements, startup latency, and development workflow needs

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