This feature has graduated! Guardrails are now a core feature of Civic Nexus. For the complete documentation, see Guardrails in Nexus.
Overview
The Guardrail Proxy started as a labs project to implement security rules between AI assistants and MCP tools. It has since become a core feature of Nexus, available to all users.What’s available in Nexus
- Conversational management: Add, list, and remove guardrails through natural language
- Request guardrails: Block or validate parameters before tools execute
- Response guardrails: Redact PII, transform data, and filter outputs
- Built-in protection: Prompt injection detection, PII patterns, and unsafe file blocking
- Hierarchy controls: Account, toolkit, and user-level policies
Get started
See the Guardrails documentation to:- Learn how guardrails work
- View available guardrail templates
- Add guardrails to your toolkits
- Configure PII redaction and other protections