---
title: "LLM firewall · Highflame Glossary"
description: "A checkpoint in front of a model that inspects prompts and responses for injection, sensitive data, and unsafe content. It guards the model's edge, not the agent's actions behind it."
doc_version: "0.1.0"
last_updated: "2026-08-07T04:48:55.536Z"
canonical: "https://www.highflame.com/glossary/llm-firewall"
---

[Home](/index.md)·[Glossary](/glossary.md)·LLM firewall

# LLM firewall

A checkpoint in front of a model that inspects prompts and responses for injection, sensitive data, and unsafe content. It guards the model's edge, not the agent's actions behind it.

Learn more: [LLM Firewall](/learn/llm-firewall.md)

Part of [the Agent Control Fabric](/platform.md): Highflame's identity, policy, and enforcement substrate for AI agents.

[Book a demo](/contact.md) [All terms](/glossary.md)

## Keep exploring the glossary.

[

### LLM security tools

The stack that protects LLM applications: input/output filters, firewalls and gateways, runtime enforcement, red teaming, and observability. No single tool covers all five.

Read →](/glossary/llm-security-tools.md)[

### MCP (Model Context Protocol)

An open protocol that connects agents to external tools and data. Powerful for capability. But every connection is a new access path that has to be governed.

Read →](/glossary/mcp.md)[

### MCP Gateway

A governed checkpoint every tool connection passes through (authenticated, policy-checked, and logged) so credentials stay central and unapproved servers can't connect.

Read →](/glossary/mcp-gateway.md)[

### Mission drift

When a non-deterministic agent gradually diverges from its intended task. Tracked at runtime so it can be contained before consequences land.

Read →](/glossary/mission-drift.md)[

### Non-human identity (NHI)

Identities belonging to machines, services, and agents rather than people. Agents are the fastest-growing and least-governed class of NHI.

Read →](/glossary/nhi.md)[

### On-behalf-of (OBO) chain

The unbroken provenance recorded on a credential (who authorized the action, what scope was granted, and how deep the delegation goes) so an audit walks back to a human.

Read →](/glossary/obo-chain.md)

## Sitemap

Full site map: [/sitemap.md](https://www.highflame.com/sitemap.md). Machine index: [/sitemap-index.xml](https://www.highflame.com/sitemap-index.xml).