registry / AI-agent control-surface risk / @chemx/starter-kit / 26.9.17-1100

@chemx/starter-kit@26.9.17-1100

Chemical X Protocol: Private drop-in architecture starter kit and capsule generator

AI Security Review

scanned 11d ago · by lpm-firewall-ai

The package has an active postinstall hook that unconditionally writes behavior-bearing MCP configuration into consumer and potentially user-level agent control surfaces. This meets the policy for blocking unconsented install-time agent control-surface mutation.

Static reason

High-risk behavior combination matched malicious policy.; previous stored version diff introduced dangerous source

Trigger

Installing the package through npm runs its postinstall hook.

Impact

Agent tools may discover and launch the added MCP server without the consumer separately choosing to configure it.

Mechanism

The hook invokes the MCP installer on the consumer project; it writes Cursor and VS Code MCP configuration and may write Gemini MCP configuration under the user's home directory.

Policy narrative

During npm installation, the postinstall hook configures the consumer project’s agent integrations and can also modify the user’s Gemini MCP configuration. The source shows no consent prompt or opt-in gate before these writes.

AI rationale

Evidence

package.jsoncli/postinstall.jscli/mcp/installer.js

Decision evidence

public snapshot

AI identified this as a dangerous AI-agent capability at 99.0% confidence with low false-positive risk.

Evidence for policy risk

package.json defines a postinstall hook that runs cli/postinstall.js.
The postinstall handler targets the consumer project and calls the MCP config installer without a consent prompt.
The installer writes a Chemical X MCP server entry into the consumer project's Cursor configuration.
The postinstall call reaches an installer that also updates the user-level Gemini MCP configuration when that configuration directory exists.

Evidence against

Behavioral surface

Source

ChildProcessEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 158 file(s), 862 KB of source, external domains: api.github.com, cdn.jsdelivr.net, chemicalx.xophz.com, example.com, fallback.com, github.com, img.shields.io, mycompassconsulting.com, reports.chemicalx.xophz.com, unpkg.com, www.w3.org

Source & flagged code

10 flagged

package.jsonView file

Lines 28-68json

28 "scripts",

29 "README.md",

30 "LICENSE",

31 "docs",

32 "assets"

33 ],

34 "exports": {

35 ".": "./cli/index.js",

36 "./audit": "./cli/audit.js",

37 "./build": "./cli/build.js",

38 "./search": "./cli/search.js",

39 "./mcp": "./cli/mcp/index.js",

40 "./reader": "./cli/reader.js",

41 "./patcher": "./cli/patcher.js"

42 },

43 "scripts": {

44 "chemx": "node cli/index.js",

45 "test": "node --test cli/audit/*.spec.js cli/mcp/*.spec.js cli/build/*.spec.js cli/team/*.spec.js cli/*.spec.js",

46 "typecheck": "tsc --noEmit",

47 "publish:both": "node scripts/publish-both.mjs",

48 "postinstall": "node cli/postinstall.js",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L48

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L48

49 "chemx:mcp": "chemx mcp",

50 "chemx:verify": "chemx verify",

51 "chemx:test": "chemx test",

52 "chemx:typecheck": "chemx typecheck"

53 },

54 "dependencies": {

55 "@babel/parser": "^7.29.8",

56 "@babel/traverse": "^7.29.8",

57 "@babel/types": "^7.29.8",

58 "react": "^18.3.1",

59 "react-dom": "^18.3.1"

60 },

61 "devDependencies": {

62 "@types/babel__traverse": "^7.28.0",

63 "@types/node": "^22.20.2",

64 "@types/react": "^18.3.31",

65 "@types/react-dom": "^18.3.7",

66 "typescript": "^5.9.3"

67 }

68}

cli/audit-preflight-git.jsView file

Lines 1-21javascript

1import fs from 'node:fs';

2import { spawnSync } from 'node:child_process';

High

Child Process

Package source references child process execution.

cli/audit-preflight-git.jsView on unpkg · L1

4const SOURCE_FILE_PATTERN = /\.

cli/terminal.jsView file

Lines 1-30javascript

1import readline from "node:readline";

2import { spawnSync } from "node:child_process";

3import { formatChemicalXGradient, ANSI } from "./theme.js";

5export const openBrowser

cli/license.jsView file

Lines 1-23javascript

1import fs from 'node:fs';

2import path from 'node:path';

3import os from 'node:os';

4import { spawnSync } from 'node:child_process';

cli/mcp/installer.jsView file

Lines 1-21javascript

1import fs from 'node:fs';

2import path from 'node:path';

3import os from 'node:os';

4import { syncAntigravityMcpSchemas } from './antigravity.js';

cli/scaffold.jsView file

•Runtime or CLI code links a write operation to an explicit external AI-agent control path: udes('--no-interactive') || boolean(process.env.ci) || process.stdout?.istty === false || process.stdin?.istty === false || boolean(process.argv?.some((arg) => arg === '--headless' || arg === '--ci' || arg === '--yes' || arg === '-y')); if (isheadless) { targetname = 'my-molecular-app'; } else { targetname = hasgum() ? guminput('project directory name:', 'my-molecular-app') : await promptquestion('project directory name [my-molecular-app]: '); } } const finaldirname = targetname.trim() || 'my-molecular-app'; const targetdir = path.resolve(process.cwd(), finaldirname); const direxists = fs.existssync(targetdir); const isdirno

High

External Ai Agent Control Surface Mutation

Runtime or CLI source writes behavior-bearing configuration into a user or project AI-agent control surface.

cli/scaffold.jsView on unpkg

•Manifest-trigger-reachable source links an external AI-agent control path to a behavior-bearing write operation. s = {}; if (!licensekey) { process.stdout.write( '\n\x1b[38;2;98;201;255m⚡ chemical x: community edition (free)\x1b[0m\n' + 'the community version is free because you tell us about your project\n' + 'and the app will automatically post your scorecard to our github discussions.\n' + 'you get a free plug, we get data to prove chemical x works and brings real value.\n' + 'everybody wins! thank you for supporting our community version.\n\n' ); files = loadlocalblueprintfiles(); iscommunity = true; } else { files = await fetchstarterkitfiles(licensekey); } let targetname = projectname; if (!targetname) { const isheadle

High

Trigger Reachable External Ai Agent Control Surface Mutation

Manifest-trigger-reachable source writes behavior-bearing configuration into a user or project AI-agent control surface.

scripts/pre-commit.shView file

•path = scripts/pre-commit.sh kind = build_helper sizeBytes = 5175 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

scripts/pre-commit.shView on unpkg

Source & flagged code

10 flagged · loading source

package.jsonView file

•scripts.postinstall = node cli/postinstall.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node cli/postinstall.js

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

cli/audit-preflight-git.jsView file

1import fs from 'node:fs'; L2: import { spawnSync } from 'node:child_process'; L3:

High

Child Process

Package source references child process execution.

cli/audit-preflight-git.jsView on unpkg · L1

Findings

1 Critical7 High5 Medium4 Low

CriticalAi Agent Control Hijackcli/mcp/installer.js

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processcli/audit-preflight-git.js

HighShellcli/terminal.js

HighSame File Env Network Executioncli/license.js

HighExternal Ai Agent Control Surface Mutationcli/scaffold.js

HighTrigger Reachable External Ai Agent Control Surface Mutationcli/scaffold.js

HighPrevious Version Dangerous Deltacli/license.js

MediumAmbiguous Install Lifecycle Scriptpackage.json

MediumNetwork

MediumEnvironment Vars

MediumShips Build Helperscripts/pre-commit.sh

Affected versions and remediation

This report applies to @chemx/starter-kit@26.9.17-1100.

See all versions of @chemx/starter-kit for other recorded verdicts.

Avoid installing @chemx/starter-kit@26.9.17-1100. 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: 2026-10-12 06:20:28.445Z (UTC).

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

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

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Behavioral surface

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Source & flagged code