registry / AI-agent control-surface risk / ttj-skills-playwright

ttj-skills-playwright

Drive an existing Chrome over CDP (Playwright core) with one-shot commands — eval, goto, click, type, wait, tabs, screenshot — plus page element visualization and crawl-target analysis. Skill for Claude Code & Codex.

This report shows the evidence for ttj-skills-playwright@1.4.10. 4 of 9 known versions are blocked or flagged. The newest version, 1.4.15, is flagged. See all versions.

AI Security Review

scanned 3mo ago · by lpm-firewall-ai

The concrete postinstall mutation of global third-party AI-agent skill directories meets the block boundary. No separate exfiltration chain is needed for this verdict.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review; previous stored version diff introduced dangerous source

Trigger

`npm install` or global installation executes `postinstall`.

Impact

Unconsented persistent agent behavior and tool-use guidance is added for future Claude Code/Codex sessions.

Mechanism

Postinstall writes package-supplied AI-agent skill files into global agent control surfaces.

Policy narrative

Installing the package executes `scripts/install-skill.js`, which copies a package-controlled skill into global Claude Code and Codex agent directories and creates an installation marker. The installed skill declares broad auto-invocation patterns and Bash/Read/Write permissions, making future agent behavior depend on unconsented package-supplied instructions. Its browser automation functions are user-facing, but they do not remove the install-time agent-control-surface mutation.

AI rationale

The concrete postinstall mutation of global third-party AI-agent skill directories meets the block boundary. No separate exfiltration chain is needed for this verdict.

Evidence

package.jsonscripts/install-skill.js.claude/skills/ttj-skills-playwright/SKILL.mddist/utils.jsdist/browser.js~/.claude/skills/ttj-skills-playwright/SKILL.md~/.agents/skills/ttj-skills-playwright/SKILL.md~/.ttj-skills-playwright-installed

Network endpoints1

registry.npmjs.org/ttj-skills-playwright/latest

Decision evidence

public snapshot

AI identified this as a dangerous AI-agent capability at 98.0% confidence with low false-positive risk.

Evidence for policy risk

`package.json` runs `postinstall` on npm installation.
`scripts/install-skill.js` copies package `SKILL.md` into `~/.claude/skills/ttj-skills-playwright/`.
`scripts/install-skill.js` writes a converted skill into `~/.agents/skills/ttj-skills-playwright/`.
`.claude/skills/ttj-skills-playwright/SKILL.md` enables broad auto-invocation and permits Bash, Read, and Write.
The lifecycle script creates `~/.ttj-skills-playwright-installed` without user interaction.

Evidence against

No credential harvesting or external data-exfiltration code was found.
The only package network endpoint inspected is npm registry version checking.
Browser/CDP automation is exposed as explicit CLI functionality, not an install-time payload.

Behavioral surface

Source

ChildProcessEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 10 file(s), 87.3 KB of source, external domains: 127.0.0.1, example.com, registry.npmjs.org, www.google.com, www.naver.com

Source & flagged code

6 flagged

package.jsonView file

Lines 1-39json

2 "name": "ttj-skills-playwright",

3 "version": "1.4.10",

4 "description": "Drive an existing Chrome over CDP (Playwright core) with one-shot commands — eval, goto, click, type, wait, tabs, screenshot — plus page element visualization and crawl-target analysis. Skill for Claude Code & Codex.",

5 "type": "module",

6 "bin": {

7 "ttj-skills-playwright": "dist/cli.js"

8 },

9 "main": "./dist/cli.js",

10 "files": [

11 "dist",

12 ".claude/skills",

13 "scripts"

14 ],

15 "scripts": {

16 "build": "tsc",

17 "start": "node dist/cli.js",

18 "prepare": "npm run build",

19 "postinstall": "node scripts/install-skill.js"

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L19

20 },

21 "dependencies": {

22 "chalk": "^5.3.0",

23 "playwright-core": "^1.61.1"

24 },

25 "devDependencies": {

26 "typescript": "^5.4.0",

27 "@types/node": "^20.11.0"

28 },

29 "keywords": [

30 "playwright",

31 "cdp",

32 "chrome",

33 "browser",

34 "automation",

35 "cli",

36 "crawl",

37 "scraping",

38 "claude",

39 "codex",

dist/utils.jsView file

Lines 1-25javascript

1/**

2 * ttj-skills-playwright - Utility functions (pure where possible)

3 */

4import os from 'os';

5import path from 'path';

6import net from 'net';

scripts/install-skill.jsView file

Lines 1-34javascript

1#!/usr/bin/env node

2/**

3 * Claude Code / Codex 스킬 자동 설치

4 * npm install 후 Claude Code와 Codex의 사용자 전역 스킬 위치에 복사합니다.

5 */

7import fs from 'fs';

8import path from 'path';

dist/cli.jsView file

•matchType = normalized_sha256 matchedPackage = ttj-sk[redacted]@1.4.9 matchedPath = dist/cli.js matchedIdentity = npm:dHRqLXNraWxscy1wbGF5d3JpZ2h0:1.4.9 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

dist/cli.jsView on unpkg

dist/browser.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = ttj-sk[redacted]@1.4.6 matchedIdentity = npm:dHRqLXNraWxscy1wbGF5d3JpZ2h0:1.4.6 similarity = 0.500 summary = stored previous version shares package body but lacks this dangerous source file

High

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

dist/browser.jsView on unpkg

Source & flagged code

6 flagged · loading source

package.jsonView file

•scripts.postinstall = node scripts/install-skill.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

dist/utils.jsView file

5import path from 'path'; L6: import net from 'net'; L7: import http from 'http'; L8: import https from 'https'; L9: import { exec } from 'child_process'; L10: import { promisify } from 'util'; ... L18: */ L19: export const getOsType = () => process.platform === 'win32' L20: ? 'windows' ... L26: */ L27: export const getHomeDir = () => os.homedir(); L28: /**

High

Sandbox Evasion Gated Capability

Source gates dangerous network, credential, or execution behavior behind CI, host, platform, time, or geo fingerprint checks.

dist/utils.jsView on unpkg · L5

•matchType = normalized_sha256 matchedPackage = ttj-sk[redacted]@1.4.9 matchedPath = dist/utils.js matchedIdentity = npm:dHRqLXNraWxscy1wbGF5d3JpZ2h0:1.4.9 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

dist/utils.jsView on unpkg

scripts/install-skill.jsView file

14Install-time AI-agent control hijack evidence: L14: const skillName = 'ttj-sk[redacted]'; L15: const sk[redacted] = path.join(__dirname, '..', '.claude', 'skills', skillName); L16: const skillFile = 'SKILL.md'; ... L19: if (!fs.existsSync(dir)) { L20: fs.mkdirSync(dir, { recursive: true }); L21: } ... L53: // Claude Code: 기존 /ttj-sk[redacted] 호출 방식 유지 L54: const claudeTargetDir = path.join(homedir(), '.claude', 'skills', skillName); L55: const claudeTargetFile = path.join(claudeTargetDir, skillFile); L56: ensureDir(claudeTargetDir); L57: fs.copyFileSync(sourceFile, claudeTargetFile); L58: console.log(`✅ Claude Code 스킬 설치 완료: ${claudeTargetFile}`); Payload evidence from .claude/skills/ttj-sk[redacted]/SKILL.md: L40: L41: When the skill is activated, always start with the bare command `ttj-

Critical

Ai Agent Control Hijack

Install-time source drops package-supplied AI-agent/MCP control files or instructions.

scripts/install-skill.jsView on unpkg · L14

dist/cli.jsView file

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

dist/cli.jsView on unpkg

dist/browser.jsView file

High

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

dist/browser.jsView on unpkg

Findings

1 Critical5 High3 Medium5 Low

CriticalAi Agent Control Hijackscripts/install-skill.js

HighInstall Time Lifecycle Scriptspackage.json

HighSandbox Evasion Gated Capabilitydist/utils.js

HighKnown Malware Source Similaritydist/utils.js

HighKnown Malware Source Similaritydist/cli.js

HighPrevious Version Dangerous Deltadist/browser.js

MediumNetwork

MediumEnvironment Vars

MediumStructural Risk Force Deep Review

LowNon Install Lifecycle Scripts

LowScripts Present

LowFilesystem

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to ttj-skills-playwright@1.4.10.

The versions list below shows the verdict for each recorded version.

Avoid installing ttj-skills-playwright@1.4.10. Remove it from direct dependencies and check your lockfile for transitive copies.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.
If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.

Evidence last updated: 2026-07-16 09:59:39.840Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

Versions

9 known versions

1.4.15latestSuspiciousAgent extension lifecycle riskWarnPublishedJul 21, 2026, 11:13 AM 1.4.13SuspiciousAgent extension lifecycle riskWarnPublishedJul 17, 2026, 1:59 AM 1.4.12SuspiciousAgent extension lifecycle riskWarnPublishedJul 17, 2026, 1:44 AM 1.4.10shownMaliciousSoft block: AI-agent control surfaceBlockPublishedJul 16, 2026, 9:54 AM 1.4.9MaliciousSoft block: AI-agent control surfaceBlockPublishedJul 16, 2026, 9:47 AM 1.4.6SuspiciousAgent extension lifecycle riskWarnPublishedJul 16, 2026, 9:15 AM 1.4.2MaliciousSoft block: AI-agent control surfaceBlockPublishedJul 12, 2026, 1:18 PM 1.1.0SuspiciousAgent extension lifecycle riskWarnPublishedJul 12, 2026, 11:28 AM 1.0.0MaliciousSoft block: AI-agent control surfaceBlockPublishedJul 12, 2026, 4:07 AM

98%Malicious

AI assessment confidence

TypeSoft block: AI-agent control surface

False-positive riskLow

Review stagesource_first_review

Firewall policyWarn by default

This finding concerns changes to an AI agent's instructions or configuration without explicit user action. It does not by itself establish malware intent. The CLI warns by default and blocks when configured for this policy.

Package metadata

npm

AuthorTTJ

Version1.4.10

PublishedJul 16, 2026

LicenseMIT

Dependencies2

Integrityverified

Package size51.4 KB

Files40

Keywordsplaywrightcdpchromebrowserautomationclicrawlscraping

LinksRepository Homepage Issues

Runtime surface

package.json

Entrypointsmain → ./dist/cli.jstypes → ./dist/cli.d.tsbin → ttj-skills-playwright

Runtimenode >=18.0.0

Artifact180 KB · 40 files1 signature(s)

Install lifecyclepostinstallprepare

Behavioral surface

ChildProcessEnvironmentVarsFilesystemNetworkShellHighEntropyStringsUrlStringsManifest: clean

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other AI-agent control-surface risk packages

Source & flagged code

Related packages

Other AI-agent control-surface risk packages