registry / AI-agent control-surface risk / mcp-chrome-scalemaker-bridge

mcp-chrome-scalemaker-bridge

Chrome Native-Messaging host (Node) — scalemaker fork with Force Reconnect + Playwright CDP fallback

This report shows the evidence for mcp-chrome-scalemaker-bridge@1.0.37, the only known version.

AI Security Review

scanned 3mo ago · by lpm-firewall-ai

The lifecycle hook performs a concrete, persistent write to ~/.claude/skills rather than merely printing setup guidance. This meets the blocking policy for unconsented postinstall mutation of a foreign AI-agent control surface.

Static reason

One or more suspicious static signals were detected.

Trigger

Global npm install while ~/.claude exists and SCALEMAKER_NO_SKILL is not set

Impact

Persists package-authored instructions into a foreign AI-agent control surface.

Mechanism

postinstall global AI-agent skill injection

Policy narrative

At global install, postinstall detects ~/.claude and copies a package-controlled SKILL.md into Claude Code's global skills directory unless an opt-out environment variable was pre-set. The skill declares broad automatic triggers and instructs the agent to run package diagnostic and repair commands. This is unconsented lifecycle-time mutation of a foreign AI-agent control surface.

AI rationale

Evidence

package.jsondist/scripts/postinstall.jsdist/skill/SKILL.mddist/mcp/mcp-server-stdio.js~/.claude/skills/chrome-mcp-scalemaker-doctor/SKILL.md~/.mcp-chrome-scalemaker/extension.zip~/Downloads/mcp-chrome-scalemaker-extension-v1.0.37

Network endpoints1

github.com/scalemaker-ship-it/mcp-chrome-scalemaker/releases/latest/download/chrome-mcp-scalemaker-extension.zip

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 dist/scripts/postinstall.js on install.
postinstall copies dist/skill/SKILL.md into ~/.claude/skills/chrome-mcp-scalemaker-doctor/SKILL.md when ~/.claude exists.
The copied skill is auto-triggered and directs Claude Code to execute diagnostic/fix commands.
Global installs also download and extract an unsigned extension ZIP from GitHub Releases.

Evidence against

The injected skill is package-branded and avoids overwriting a differently named existing skill.
Bridge runtime networking is limited to localhost MCP endpoints in inspected code.

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetwork

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 31 file(s), 246 KB of source, external domains: 127.0.0.1, github.com

Source & flagged code

6 flagged

package.jsonView file

Lines 67-89json

67 }

68 },

69 "lint-staged": {

70 "*.{js,ts}": [

71 "eslint --fix",

72 "prettier --write"

73 ],

74 "*.{json,md}": [

75 "prettier --write"

76 ]

77 },

78 "scripts": {

79 "dev": "nodemon --watch src --ext ts,js,json --ignore dist/ --exec \"npm run build && npm run register:dev\"",

80 "build": "ts-node src/scripts/build.ts",

81 "test": "jest",

82 "test:watch": "jest --watch",

83 "lint": "eslint 'src/**/*.{js,ts}'",

84 "lint:fix": "eslint 'src/**/*.{js,ts}' --fix",

85 "format": "prettier --write 'src/**/*.{js,ts,json}'",

86 "register:dev": "node dist/scripts/register-dev.js",

87 "postinstall": "node -e \"const f='dist/scripts/postinstall.js';require('fs').existsSync(f)&&require('child_process').execFileSync(process.execPath,[f],{stdio:'inherit'})\""

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L87

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg · L87

88 }

89}

dist/scripts/utils.jsView file

Lines 1-40javascript

1"use strict";

2var __importDefault = (this && this.__importDefault) || function (mod) {

3 return (mod && mod.__esModule) ? mod :

dist/scripts/doctor.jsView file

Lines 404-444javascript

404 });

405 return fixes;

406}

407// ============================================================================

408// JSON File Reading

409// ============================================================================

410function readJsonFile(filePath) {

411 try

dist/run_host.shView file

•path = dist/run_host.sh kind = build_helper sizeBytes = 9803 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

dist/run_host.shView on unpkg

Source & flagged code

6 flagged · loading source

package.jsonView file

•scripts.postinstall = node -e "const f='dist/scripts/postinstall.js';require('fs').existsSync(f)&&require('child_process').execFileSync(process.execPath,[f],{stdio:'inherit'})"

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node -e "const f='dist/scripts/postinstall.js';require('fs').existsSync(f)&&require('child_process').execFileSync(process.execPath,[f],{stdio:'inherit'})"

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg

dist/scripts/utils.jsView file

20Trigger-reachable persistence chain: manifest.bin -> dist/cli.js -> dist/scripts/utils.js L20: const os_1 = __importDefault(require("os")); L21: const child_process_1 = require("child_process"); L22: const util_1 = require("util"); ... L36: function getLogDir() { L37: const homedir = os_1.default.homedir(); L38: if (os_1.default.platform() === 'darwin') { ... L41: else if (os_1.default.platform() === 'win32') { L42: return path_1.default.join(process.env.LOCALAPPDATA || path_1.default.join(homedir, 'AppData', 'Local'), 'mcp-chrome-bridge', 'logs'); L43: } ... L102: const packageDistDir = path_1.default.join(__dirname, '..'); L103: const wrapperScriptName = process.platform === 'win32' ? 'run_host.bat' : 'run_host.sh'; L104: const absoluteWrapperPath = path_1.default.resolve(packageDistDir,

Findings

3 High6 Medium4 Low

HighInstall Time Lifecycle Scriptspackage.json

HighCopied Package Dependency Bridgedist/scripts/doctor.js

HighTrigger Reachable Persistencedist/scripts/utils.js

MediumAmbiguous Install Lifecycle Scriptpackage.json

MediumNetwork

MediumEnvironment Vars

MediumInstall Persistencedist/scripts/utils.js

MediumShips Build Helperdist/run_host.sh

MediumStructural Risk Force Deep Review

LowScripts Present

LowFilesystem

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to mcp-chrome-scalemaker-bridge@1.0.37.

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

Avoid installing mcp-chrome-scalemaker-bridge@1.0.37. 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: 2026-08-09 09:12:00.011Z (UTC).

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

Versions

1 known version

1.0.37latestshownMaliciousSoft block: AI-agent control surfaceBlockPublishedAug 7, 2026, 11:37 AM

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

Behavioral surface

Related packages

Other AI-agent control-surface risk packages

Source & flagged code