SystemPrompt

SystemPrompt is a self-hosted control plane that sits between your developers (or agents) and the LLM providers they call. It proxies traffic to Claude, OpenAI, Gemini, Groq and custom endpoints through a single gateway, then applies a governance pipeline that checks each request against organizational policy, redacts secrets, restricts which tools and data sources the model can touch, and writes a full audit log with per-user cost attribution.

The pitch is aimed squarely at security and compliance teams who are tired of stitching together a half-dozen point tools to satisfy SOC 2, ISO 27001, HIPAA or the OWASP Agentic Top 10. Because the whole stack runs inside your own VPC, prompt data and credentials never leave the network boundary, which is the differentiator versus SaaS guardrail vendors. The product is free to download and run indefinitely; commercial licensing (and hands-on implementation services) is sold direct by the founder rather than by self-serve plan.

A template repo is published on GitHub under systempromptio/, and the gateway exposes drop-in endpoints like /v1/messages so existing Anthropic SDK clients can be repointed with a base-URL change. It is infrastructure, not an end-user chat product, so expect to invest engineering time to deploy, write policies and wire it into your identity provider.