Prismor: open-source runtime guard for Claude Code, Codex, and Cursor

Prismor (formerly Immunity Agent) is a self-hosted Apache-2.0 control plane that sits between Claude Code, Codex, Cursor, or Windsurf and every tool call, allowing, warning, or blocking by policy before execution. It wraps npm/pip with supply-chain scoring, cloaks secrets in payloads, and ships an MCP Gateway that policy-checks calls and injection-scans responses; pip install prismor plus prismor setup wires named postures from lightweight dev-safe to airgapped.