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

@chemx/starter-kit

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

This report shows the evidence for @chemx/starter-kit@26.10.7-1061. 20 of 43 known versions are blocked or flagged. The newest version, 26.10.19-530, is allowed. See all versions.

AI Security Review

scanned 11d ago · by lpm-firewall-ai

The automatic postinstall mutates foreign AI-agent configuration and registers an executable MCP server without a consent guard. This is an unconsented install-time control-surface change, so it meets the blocking policy.

Static reason

High-risk behavior combination matched malicious policy.

Trigger

Installing the package through npm triggers its postinstall script.

Impact

Configured agents can invoke the package’s MCP command in consumer projects after installation.

Mechanism

The hook calls the installer, which merges a Chemical X server entry into Cursor and VS Code project configs and an existing Antigravity user config.

Policy narrative

An npm installation runs the postinstall handler, which automatically registers the package’s MCP server in consumer agent configuration. The installer writes project-level Cursor and VS Code files and may also update the user’s Antigravity configuration, enabling those agents to invoke the package without a separate consent step.

AI rationale

Evidence

package.jsoncli/postinstall.jscli/mcp/installer.js.cursor/mcp.json.vscode/mcp.json~/.gemini/config/mcp_config.json

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

The package runs cli/postinstall.js automatically after installation.
The postinstall handler calls installAllMcpConfigs for the consumer project without a consent check.
The installer writes MCP server configuration into the consumer’s Cursor and VS Code project files and, when present, the user’s Antigravity configuration.
The configured server can run the package’s MCP command, creating an agent control surface as an install-time side effect.

Evidence against

Behavioral surface

Source

ChildProcessEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 259 file(s), 1.33 MB of source, external domains: api.github.com, api.local, chemicalx.xophz.com, fallback.com, github.com, img.shields.io, mycompassconsulting.com, reports.chemicalx.xophz.com, www.w3.org

Source & flagged code

8 flagged

package.jsonView file

Lines 36-76json

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

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

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

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

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

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

42 "./patcher": "./cli/patcher.js",

43 "./errors": "./cli/errors/index.js"

44 },

45 "scripts": {

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

47 "bench": "node benchmarks/run-benchmark.mjs",

48 "ui": "node cli/index.js ui",

49 "dev:ui": "node cli/index.js ui --dev",

50 "dev:ui:watch": "node --watch --watch-path=cli cli/index.js ui --dev",

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

52 "check:frameworks": "node scripts/check-framework-generation.mjs",

53 "prepublishOnly": "node scripts/check-framework-generation.mjs",

54 "typecheck": "tsc --noEmit",

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

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

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L56

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L56

57 "chemx:mcp": "chemx mcp",

58 "chemx:verify": "chemx verify",

59 "chemx:test": "chemx test",

60 "chemx:typecheck": "chemx typecheck"

61 },

62 "dependencies": {

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

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

65 "@babel/types": "^7.29.8"

66 },

67 "devDependencies": {

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

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

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

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

72 "@vue/test-utils": "^2.5.1",

73 "chemx": "file:.",

74 "react": "^18.3.1",

75 "react-dom": "^18.3.1",

76 "typescript": "^5.9.3",

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/build/executor.jsView file

Lines 1-31javascript

1import { spawn } from 'node:child_process';

3export const executeBuild = (command, cwd = process.cwd(), options = {})

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';

scripts/pre-commit.shView file

•path = scripts/pre-commit.sh kind = build_helper sizeBytes = 8215 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

scripts/pre-commit.shView on unpkg

cli/audit/ai-slop-detector.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 2

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

cli/audit/ai-slop-detector.js#virtual:normalized:round1View on unpkg

Source & flagged code

8 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 Critical5 High5 Medium5 Low

CriticalAi Agent Control Hijackcli/mcp/installer.js

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processcli/audit-preflight-git.js

HighShellcli/build/executor.js

HighSame File Env Network Executioncli/license.js

HighSemantic Analysis Limitedcli/audit/ai-slop-detector.js#virtual:normalized:round1

MediumAmbiguous Install Lifecycle Scriptpackage.json

MediumNetwork

MediumEnvironment Vars

MediumShips Build Helperscripts/pre-commit.sh

MediumStructural Risk Force Deep Review

LowNon Install Lifecycle Scripts

LowScripts Present

Affected versions and remediation

This report applies to @chemx/starter-kit@26.10.7-1061.

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

Avoid installing @chemx/starter-kit@26.10.7-1061. 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 06:26:07.393Z (UTC).

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

Versions

43 known versions

26.10.19-530latestManual Review—AllowUnder ReviewOct 21, 2026, 5:16 PM 26.10.10-75Clean—AllowPublishedOct 10, 2026, 8:56 AM 26.10.8-344SuspiciousAgent extension lifecycle riskWarnPublishedOct 8, 2026, 6:05 AM 26.10.7-1061shownMaliciousSoft block: AI-agent control surfaceBlock

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

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Behavioral surface

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Source & flagged code