Is mcp-use/mcp-use safe to install?

mcp-use/mcp-use was flagged as CRITICAL RISK (risk score 955) with 96 findings detected across 1450 files. Review the findings before installing.

What security issues were found in mcp-use/mcp-use?

Sigil detected 96 findings in mcp-use/mcp-use, including patterns related to code_patterns, network_exfil, provenance, install_hooks, obfuscation. See the full scan report for details.

Scans/github/mcp-use/mcp-use

mcp-use/mcp-use

github

Summary

mcp-use/mcp-use v2026-03-20 was classified as CRITICAL RISK with a risk score of 955. Sigil detected 96 findings across 1450 files, covering phases including code patterns, network exfiltration, provenance, install hooks, obfuscation. Review the findings below before installing this package.

Package description: The fullstack MCP framework to develop MCP Apps for ChatGPT / Claude & MCP Servers for AI Agents.

CRITICAL RISK(955)

v2026-03-20

21 March 2026, 00:42 UTC

by Sigil Bot

Risk Score

955

Findings

Files Scanned

1450

Provenance

Registry

https://github.com/mcp-use/mcp-use

Repository

https://github.com/mcp-use/mcp-use

Scanned From

https://github.com/mcp-use/mcp-use.git

Findings 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-npm-postinstall

CRITICAL

npm lifecycle script — runs automatically on install

repo/libraries/typescript/packages/create-mcp-use-app/src/templates/blank/package.json:16

  "scripts": {
    "postinstall": "mcp-use generate-types || true",
    "build": "mcp-use build",

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-npm-postinstall

CRITICAL

npm lifecycle script — runs automatically on install

repo/libraries/typescript/packages/create-mcp-use-app/src/templates/mcp-apps/package.json:28

    "deploy": "mcp-use deploy",
    "postinstall": "mcp-use generate-types || true"
  },

Why was this flagged?

install-npm-postinstall

CRITICAL

npm lifecycle script — runs automatically on install

repo/libraries/typescript/packages/create-mcp-use-app/src/templates/starter/package.json:24

  "scripts": {
    "postinstall": "mcp-use generate-types || true",
    "build": "mcp-use build",

Why was this flagged?

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