CPEX#

A lightweight plugin framework for building extensible AI systems

CPEX lets you intercept, enforce, and extend application behavior through plugins — without modifying core logic. Define hook points in your application, write plugins that attach to them, and compose enforcement pipelines that run automatically.

from cpex.framework import hook, Plugin, PluginResult, PluginViolation

class RateLimitPlugin(Plugin):
    @hook("tool_pre_invoke")
    async def check_rate_limit(self, payload, context):
        if self.is_over_limit(context):
            return PluginResult(
                continue_processing=False,
                violation=PluginViolation(reason="Rate limit exceeded", code="RATE_LIMIT")
            )
        return PluginResult(continue_processing=True)

Register the plugin, and it runs at every hook invocation. No changes to your application logic.

What you can build with CPEX#

• Security — access control, prompt injection detection, data loss prevention
• Observability — request tracing, audit logging, metrics collection
• Governance — policy enforcement, compliance validation, approval workflows
• Reliability — rate limiting, circuit breakers, response validation