Doberman: An execution gateway to prevent agent disasters
Da_Lil_Fu · reddit · 2026-09-02
After an agent deleted a project before a hackathon demo due to a hallucination, the author built Doberman, a security layer that gates every tool call with a Pass/Approve/Block verdict before execution.
Mechanism:
- Sits on the execution path rather than filtering inputs.
- Native integration with Codex (PreToolUse hook) and Claude Code; supports other tools via MCP stdio proxy.
- Unified policy across all agents.
Features: Blocks with reason codes, one-time approvals, output scanning to prevent leaked keys from re-entering context, and fail-closed error handling.
Related event: Doberman: Open-Source Gateway Intercepts Risky Agent Actions(3 posts)→
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