---
title: "Documentation"
weight: 1
bookFlatSection: true
---

# CPEX Documentation

CPEX is a policy enforcement runtime for AI agents: a deterministic reference monitor that mediates every operation an untrusted LLM triggers. Each capability an agent can invoke defines its own enforcement pipeline (authorization, delegation, redaction, information-flow control, audit), configured in APL and run deterministically at the boundary.

Start with the [Vision]({{< relref "/docs/vision" >}}) for the reference-monitor model, the [Quick Start]({{< relref "/docs/quickstart" >}}) to stand up an enforcement point, or [APL]({{< relref "/docs/apl" >}}) to write policy.

Using the Python 0.1.x line? Its docs are preserved under [0.1.x (Legacy)]({{< relref "/docs/0.1.x" >}}).
