registry / AI-agent control-surface risk / @chem-x/create-chemx / 26.10.8-344

@chem-x/create-chemx@26.10.8-344

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

AI Security Review

scanned 5d ago · by lpm-firewall-ai

The package has an automatic postinstall hook that mutates project and global AI-agent configuration to register its MCP server without affirmative consent. This is an unconsented install-time change to agent control surfaces, so the package should be blocked.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review

Trigger

Installing the package with npm, which runs its postinstall hook.

Impact

Agent clients may load the newly registered server and expose its capabilities in the consumer’s project or global agent environment.

Mechanism

The hook resolves the consumer directory and invokes an installer that merges the package’s MCP server entry into agent configuration files without an affirmative setup step.

Policy narrative

During package installation, the postinstall hook configures agent MCP settings without asking the consumer to opt in. It writes project-level Cursor and VS Code configuration and conditionally modifies global Antigravity configuration, registering this package’s MCP server.

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 manifest runs cli/postinstall.js automatically during installation.
The postinstall hook targets the consumer’s install directory and calls installAllMcpConfigs without a consent check.
The installer writes an MCP server entry into project-level Cursor and VS Code configuration files.
When the Antigravity config directory exists, the installer adds an MCP server entry to its global configuration.
The configured server launches this package’s MCP command through a local entrypoint or npm exec.

Evidence against

Behavioral surface

Source

ChildProcessEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 260 file(s), 1.37 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

14 flagged

package.jsonView file

Lines 34-74json

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

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

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

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

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

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

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

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

42 },

43 "scripts": {

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

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

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

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

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

49 "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",

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

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

52 "typecheck": "tsc --noEmit",

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

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

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L54

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L54

55 "chemx:mcp": "chemx mcp",

56 "chemx:verify": "chemx verify",

57 "chemx:test": "chemx test",

58 "chemx:typecheck": "chemx typecheck"

59 },

60 "dependencies": {

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

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

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

64 "@chemx/x-atoms": "26.10.8-285"

65 },

66 "devDependencies": {

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

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

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

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

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

72 "chemx": "file:.",

73 "react": "^18.3.1",

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

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

•matchType = normalized_sha256 matchedPackage = create-chemx@26.10.4-235 matchedPath = scripts/pre-commit.sh matchedIdentity = npm:Y3JlYXRlLWNoZW14:26.10.4-235 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.

scripts/pre-commit.shView on unpkg

•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

cli/audit/social-git.jsView file

•matchType = normalized_sha256 matchedPackage = create-chemx@26.10.4-235 matchedPath = cli/audit/social-git.js matchedIdentity = npm:Y3JlYXRlLWNoZW14:26.10.4-235 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.

cli/audit/social-git.jsView on unpkg

cli/errors/publisher.jsView file

•matchType = normalized_sha256 matchedPackage = create-chemx@26.10.4-235 matchedPath = cli/errors/publisher.js matchedIdentity = npm:Y3JlYXRlLWNoZW14:26.10.4-235 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.

cli/errors/publisher.jsView on unpkg

cli/navigator-share.jsView file

•matchType = normalized_sha256 matchedPackage = create-chemx@26.10.4-235 matchedPath = cli/navigator-share.js matchedIdentity = npm:Y3JlYXRlLWNoZW14:26.10.4-235 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.

cli/navigator-share.jsView on unpkg

Source & flagged code

14 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 Critical11 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

HighKnown Malware Source Similaritycli/audit/social-git.js

HighKnown Malware Source Similaritycli/license.js

HighKnown Malware Source Similaritycli/build/executor.js

HighKnown Malware Source Similaritycli/errors/publisher.js

HighKnown Malware Source Similaritycli/navigator-share.js

Affected versions and remediation

This report applies to @chem-x/create-chemx@26.10.8-344.

See all versions of @chem-x/create-chemx for other recorded verdicts.

Avoid installing @chem-x/create-chemx@26.10.8-344. 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: 2026-10-18 09:10:40.501Z (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

Related packages

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Behavioral surface

Source & flagged code

Related packages

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Other AI-agent control-surface risk packages