Protect U Back: A Local Pre-I/O Audit Gate for AI Agents

Protect U Back (PUB) is a local pre-I/O audit gate and supervisor for AI coding agents, designed to enforce a simple rule: any agent action must leave observable evidence before it is allowed to affect the real world. It operates by intercepting proposed tool calls and filesystem or shell actions, normalizing them into auditable "envelopes," observing the state of a protected surface before and after the action, and deciding to `PASS`, `HOLD`, `KILL`, or `QUARANTINE` the action. The system uses an "X-ray" layer to take snapshots and compute residuals based on a process equation, ensuring that any unobserved or mutated state triggers a `HOLD`. It is not a prompt filter but an action inspector, designed to prevent silent data exfiltration or system modification. The project provides a launcher to run Claude Code or Codex CLI through this gate, and on Linux/WSL2 can additionally confine the agent inside a `bwrap` cage. The repository includes a reproducible credential-egress verification experiment to demonstrate how the gate would block a malicious exfiltration attempt. The tool is experimental and provided as-is for review, with an explicit non-commercial license. 

https://github.com/tim-harries430/Protect_U_Back

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