This is Ravi, the developer who built this.
Few months back, I was building an AI app and realized my users data was going to OpenAI in plaintext. I searched for a local firewall something that would sit between my app and the LLM provider, inspect everything, and block threats. Nothing open-source existed that was complete. So I built Sentinel Protocol. It works like this:
1. You run one command: npx sentinel bootstrap --profile minimal
2. It starts a proxy at localhost:8787
3. You point your existing OpenAI SDK at localhost:8787 instead
4. Done.
Every prompt and response now goes through 81 security engines on YOUR machine.
What makes it different from LLM Guard / Rebuff / NeMo Guardrails: -
Runs 100% locally (they mostly require cloud) - 9 npm dependencies (they have 50–200+)
Formal verification with TLA+ and Alloy specs
Self-healing immune system that learns from attacks
Federated threat mesh - share threat signatures with peers.
The thing I'm most proud of is the self-healing engine. When it detects a new attack pattern it has never seen, it auto-generates a blocking rule for future attacks. It gets smarter every day.
Happy to answer any questions about the architecture, the security model, or specific engines.
1. You run one command: npx sentinel bootstrap --profile minimal 2. It starts a proxy at localhost:8787 3. You point your existing OpenAI SDK at localhost:8787 instead 4. Done.
Every prompt and response now goes through 81 security engines on YOUR machine. What makes it different from LLM Guard / Rebuff / NeMo Guardrails: - Runs 100% locally (they mostly require cloud) - 9 npm dependencies (they have 50–200+) Formal verification with TLA+ and Alloy specs Self-healing immune system that learns from attacks Federated threat mesh - share threat signatures with peers. The thing I'm most proud of is the self-healing engine. When it detects a new attack pattern it has never seen, it auto-generates a blocking rule for future attacks. It gets smarter every day.
Happy to answer any questions about the architecture, the security model, or specific engines.