Prismor is a new free, open-source runtime control plane for AI coding agents such as Claude Code, Codex, and Cursor. It sits between the agent and the actions the agent wants to take, and it checks every tool call against a policy before it runs. Each call gets one of three verdicts: allow, warn, or block. Endpoint security tools watch the kernel and file system, so they only see what an agent does after it has acted. Prismor steps in before the action happens. That matters when a poisoned file or web page redirects an agent, when an agent sends out the contents of a.env file, or when it installs a compromised package.
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