registry / AI-agent control-surface risk / @chem-x/starter-kit / 26.10.8-344

@chem-x/starter-kit@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 postinstall hook performs unconsented changes to project and global AI-agent control configuration and enables the package's MCP capabilities. This is concrete installation-time control-surface abuse, so publication should be blocked.

Static reason

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

Trigger

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

Impact

Consumer coding agents gain access to the package's MCP capabilities, including file read, patch, and write operations, through configuration changed during package installation.

Mechanism

The hook configures Cursor and VS Code in the consumer project and, when the Antigravity config directory exists, registers the server globally and writes tool schemas and instructions without asking for consent.

Policy narrative

The npm postinstall hook automatically changes project-level agent configuration and can register a server in Antigravity's global configuration. The resulting server exposes file modification operations, while its generated instructions describe avoiding separate approval for each sub-operation. The source shows no affirmative consent gate for this installation-time setup.

AI rationale

Evidence

package.jsoncli/postinstall.jscli/mcp/installer.jscli/mcp/antigravity.jscli/mcp/manifests.js.cursor/mcp.json.vscode/mcp.json~/.gemini/config/mcp_config.json~/.gemini/antigravity/mcp/chemical-x/

Decision evidence

public snapshot

AI identified this as a dangerous AI-agent capability at 94.0% confidence with low false-positive risk.

Evidence for policy risk

The package manifest runs cli/postinstall.js automatically after installation, and the script invokes the MCP installer for the consumer directory without an affirmative consent check.
The installer merges and writes MCP server configuration into the consumer project's Cursor and VS Code config files.
When Antigravity's global config directory exists, the installer writes its MCP server registration and synchronizes tool schemas and instructions under the user's home directory.
Generated Antigravity instructions say the master tool avoids separate approval for each sub-operation, and the registered MCP tool exposes file read, patch, and write actions.

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

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

67 },

68 "devDependencies": {

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

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

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

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

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

74 "chemx": "file:.",

75 "react": "^18.3.1",

76 "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 = @chem-x/create-chemx@26.10.8-344 matchedPath = scripts/pre-commit.sh matchedIdentity = npm:QGNoZW0teC9jcmVhdGUtY2hlbXg:26.10.8-344 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 = @chem-x/create-chemx@26.10.8-344 matchedPath = cli/audit/social-git.js matchedIdentity = npm:QGNoZW0teC9jcmVhdGUtY2hlbXg:26.10.8-344 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

•matchType = malicious_source_fingerprint_signature signature = 803626701b780206 signatureType = suspicious_hashes sourceLabel = final_verdict:malicious matchedPackage = @chem-x/create-chemx@26.10.8-344 matchedPath = cli/audit/social-git.js matchedIdentity = npm:QGNoZW0teC9jcmVhdGUtY2hlbXg:26.10.8-344 similarity = 1.000 shingleOverlap = 100 summary = package final verdict is malicious

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

cli/audit/social-git.jsView on unpkg

cli/errors/publisher.jsView file

•matchType = normalized_sha256 matchedPackage = @chem-x/create-chemx@26.10.8-344 matchedPath = cli/errors/publisher.js matchedIdentity = npm:QGNoZW0teC9jcmVhdGUtY2hlbXg:26.10.8-344 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 = @chem-x/create-chemx@26.10.8-344 matchedPath = cli/navigator-share.js matchedIdentity = npm:QGNoZW0teC9jcmVhdGUtY2hlbXg:26.10.8-344 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

15 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 Critical12 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/starter-kit@26.10.8-344.

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

Avoid installing @chem-x/starter-kit@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 09:14:22.520Z (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