Is @cooperagent/cooper safe to install?

@cooperagent/cooper was flagged as CRITICAL RISK (risk score 990) with 64 findings detected across 24 files. Review the findings before installing.

What security issues were found in @cooperagent/cooper?

Sigil detected 64 findings in @cooperagent/cooper, including patterns related to code_patterns, obfuscation, install_hooks. See the full scan report for details.

Scans/npm/@cooperagent/cooper

@cooperagent/cooper

npm

Summary

@cooperagent/cooper v was classified as CRITICAL RISK with a risk score of 990. Sigil detected 64 findings across 24 files, covering phases including code patterns, obfuscation, install hooks. Review the findings below before installing this package.

CRITICAL RISK(990)

16 March 2026, 15:54 UTC

by Sigil Bot

Risk Score

990

Findings

Files Scanned

Provenance

Registry

https://www.npmjs.com/package/@cooperagent/cooper

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

package/package.json:40

    "test:all": "npm run test && npm run test:e2e",
    "postinstall": "npx patch-package && node scripts/rebuild-node-pty.js && node -e \"if(process.platform==='darwin'){require('child_process').execSync('codesign --force --deep --sign - --entitlements build/entitlements.mac.plist node_modules/electron/dist/Electron.app',{stdio:'inherit'})}\"",
    "rebuild-pty": "node scripts/rebuild-node-pty.js -f",

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.

Badge

Markdown

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HTML

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