AI coding agents have direct access to your file system and terminal. Understanding their safety architecture is critical — especially for enterprise deployments.
Claude Code (15/15): 4-layer progressive permission chain — config rules → tool checkPermissions → side-model command classifier → UI confirmation. The side-model classifier uses a small LLM to silently vet all bash commands before execution.
Codex (10/15): Configurable rules with tool-level permissions. Less layered than Claude Code but still robust.
Open-Source Agents (4-6/15): Most open-source agents have basic safety at best. Aider relies on git as its safety net (auto-commits enable undo). Cline and Continue have basic permission prompts for critical operations.
Permission Chains: The best agents have layered permission systems where each sensitive action requires approval at multiple levels. Claude Code's side-model classifier is unique — it silently evaluates command safety without blocking productivity.
Anti-Distillation: Claude Code includes fake tool definitions and cryptographic signatures to prevent model extraction. Enterprise-grade protection against prompt injection.
Git Safety: Aider uses git auto-commits as a safety net — every change is reversible. This is a pragmatic approach that works well for individual developers.
For teams handling sensitive codebases, Claude Code's 15/15 safety score is unmatched. For personal projects, git-based safety (Aider) or basic permission prompts are sufficient.