zn-gate (local)

Install and CLI

Install zn-gate for Node.js, Python or from source, and the commands it provides.

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zn-gate is the open-source local engine: deterministic rules, an MCP server and proxy, an evidence ledger and SDKs. It has no runtime dependencies and works offline on macOS, Windows and Linux.

Install

# Run without installing
npx -y zn-gate --version

# Or add it to a project
npm install zn-gate

Python 3.8 or later, standard library only:

pip install zn-gate
git clone https://github.com/usezn/zn
cd zn && cargo build --release

Commands

Command What it does
init Finds MCP configs in supported agent environments and wraps their servers with zn (details)
shield Wraps any MCP server command (uvx, npx, node, python) with zn
mcp Runs zn as a standalone MCP server (clients)
analyze <text> Checks one input and prints verdict and rule
scan <path> Recursively audits prompt templates, Markdown, skills and configs for injection traps
evidence Verifies, browses and exports the audit ledger (details)
logs Tails or inspects security event logs
test Runs the built-in self-test (attack and benign vectors plus latency)
status Shows engine configuration and gateway connectivity

Run npx -y zn-gate --help for every option.

Configuration

Setting How to set it Effect
API key ZN_API_KEY env var or --key Enables the cloud neural gate in addition to local rules
Local only --local-only Forces offline rules even when a key is set
Endpoint --url Overrides the gateway URL
Scan scope --all, --include .rst,.xml, --exclude fixtures Controls which files scan reads
Debug --verbose Debug logging to stderr

Without a key, zn-gate uses local rules only and never sends data anywhere.