Summary
vaayne/agent-kit v2026-04-16 was classified as CRITICAL RISK with a risk score of 403. Sigil detected 29 findings across 448 files, covering phases including provenance, install hooks, code patterns, obfuscation, network exfiltration. Review the findings below before installing this package.
Package description: Reusable components for AI coding agents: skills, subagents, MCP servers, and extensions.
v2026-04-16
30 April 2026, 04:52 UTC
by Sigil Bot
Risk Score
403
Findings
29
Files Scanned
448
Provenance
Repository
https://github.com/vaayne/agent-kitScanned From
https://github.com/vaayne/agent-kit.gitFindings by Phase
Phase Ordering
Phases are ordered by criticality, with the most dangerous at the top. Click any phase header to expand or collapse its findings. Critical phases are expanded by default.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
repo/extensions/mcp/README.md:62
# Using the install script
curl -fsSL https://raw.githubusercontent.com/vaayne/mcphub/main/scripts/install.sh | sh
Why was this flagged?
A script or Makefile pipes content from a remote URL directly into a shell (curl | sh or wget | bash). This is inherently dangerous because the remote content can change at any time, and the command runs with the current user's permissions. Rated HIGH because it requires manual execution (unlike install hooks) but still executes arbitrary remote code.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
repo/extensions/mcp/client.ts:59
throw new Error(
"mh CLI not found. Install it with: curl -fsSL https://raw.githubusercontent.com/vaayne/mcphub/main/scripts/install.sh | sh",
);Why was this flagged?
A script or Makefile pipes content from a remote URL directly into a shell (curl | sh or wget | bash). This is inherently dangerous because the remote content can change at any time, and the command runs with the current user's permissions. Rated HIGH because it requires manual execution (unlike install hooks) but still executes arbitrary remote code.
install-npm-postinstall
CRITICALnpm lifecycle script — runs automatically on install
repo/extensions/mcp/package.json:32
"scripts": {
"postinstall": "node scripts/postinstall.js",
"lint": "biome lint --write .",Why was this flagged?
npm lifecycle scripts like postinstall run automatically during package installation with no user interaction required. This is the #1 attack vector for malicious npm packages — attackers embed data theft or backdoor installation in these hooks. Rated CRITICAL because code executes before the developer can review it.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
repo/extensions/mcp/scripts/postinstall.js:30
// Use the official install script
execSync(`curl -fsSL "${INSTALL_SCRIPT_URL}" | sh`, {
stdio: "inherit",Why was this flagged?
A script or Makefile pipes content from a remote URL directly into a shell (curl | sh or wget | bash). This is inherently dangerous because the remote content can change at any time, and the command runs with the current user's permissions. Rated HIGH because it requires manual execution (unlike install hooks) but still executes arbitrary remote code.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
repo/extensions/mcp/scripts/postinstall.js:37
console.error(" You can install it manually:");
console.error(` curl -fsSL ${INSTALL_SCRIPT_URL} | sh`);
}Why was this flagged?
A script or Makefile pipes content from a remote URL directly into a shell (curl | sh or wget | bash). This is inherently dangerous because the remote content can change at any time, and the command runs with the current user's permissions. Rated HIGH because it requires manual execution (unlike install hooks) but still executes arbitrary remote code.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
repo/skills/tap-web/SKILL.md:20
# Install tap CLI (includes embedded skill)
curl -fsSL https://raw.githubusercontent.com/vaayne/tap/main/scripts/install.sh | sh
Why was this flagged?
A script or Makefile pipes content from a remote URL directly into a shell (curl | sh or wget | bash). This is inherently dangerous because the remote content can change at any time, and the command runs with the current user's permissions. Rated HIGH because it requires manual execution (unlike install hooks) but still executes arbitrary remote code.
Badge
Markdown
[](https://sigilsec.ai/scans/F373DA63-A4D6-4C92-8713-651894B871CA)HTML
<a href="https://sigilsec.ai/scans/F373DA63-A4D6-4C92-8713-651894B871CA"><img src="https://sigilsec.ai/badge/github/vaayne/agent-kit" alt="Sigil Scan"></a>Run This Scan Yourself
Scan your own packages
Run Sigil locally to audit any package before it touches your codebase.
Early Access
Get cloud scanning, threat intel, and CI/CD integration.
Join 150+ developers on the waitlist.
Get threat intelligence and product updates
Security research, new threat signatures, and product updates. No spam.
Other github scans
Believe this result is incorrect? Request a review or see our Terms of Service and Methodology.