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Mountain Theory
The antivirus for AI
Table of Contents
Mountain Theory - 2026 Pricing, Features, Reviews & Alternatives
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Last updated: October 2026
Mountain Theory overview
What is Mountain Theory?
Mountain Theory is the antivirus for AI. It checks every action an AI agent takes before it runs, against rules written in plain English, then allows it, holds it for a person, or blocks it. No signatures to update. Every decision is logged for your auditor. It works with any AI you already use, from coding agents like Claude Code and OpenAI Codex to models in your own environment or the cloud.
It stops an AI working around a block, catches an AI drifting off its task, and stops new bad behavior on day one, with no new rule needed to do it. It keeps personal data from leaving and blocks instructions hidden in documents.
Built for organizations in healthcare, financial services, defense, public safety and education, where a wrong action by an AI agent is a breach, not a bug report.
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