@chem-x/create-chemx@26.9.20-390
Chemical X Protocol: Private drop-in architecture starter kit and capsule generator
AI Security Review
scanned 11d ago · by lpm-firewall-aiThe package defines an automatic postinstall hook that mutates consumer AI-agent configuration without consent. This meets the policy for blocking unconsented lifecycle mutation of an agent control surface.
Static reason
High-risk behavior combination matched malicious policy.; previous stored version diff introduced dangerous source
Trigger
Installing the package through npm, which runs its postinstall hook.
Impact
Agent clients may load and run the registered package command automatically.
Mechanism
The hook invokes MCP setup for the consumer directory; setup registers a Chemical X server in Cursor and VS Code project files and in existing global Antigravity configuration.
Policy narrative
During npm installation, the postinstall hook calls MCP setup for the consumer directory without a consent prompt. The setup writes project agent configuration and can register the server in global Antigravity configuration when that configuration directory exists.
AI rationale
The package defines an automatic postinstall hook that mutates consumer AI-agent configuration without consent. This meets the policy for blocking unconsented lifecycle mutation of an agent control surface.
Evidence
package.jsoncli/postinstall.jscli/mcp/installer.js.cursor/mcp.json.vscode/mcp.json~/.gemini/config/mcp_config.json
Decision evidence
public snapshotAI 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 when installed.
- For non-self installs, postinstall calls MCP setup without a consent prompt.
- MCP setup writes a server entry into the consumer project's Cursor configuration and also attempts global Antigravity configuration when its config directory exists.
Evidence against
Behavioral surface
ChildProcessEnvironmentVarsFilesystemNetworkShell
HighEntropyStringsUrlStrings
Source & flagged code
11 flagged · loading sourcepackage.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 unpkgcli/errors/errors.spec.jsView file
27patternName = github_pat
severity = critical
line = 27
Critical
Critical Secret
Package contains a critical-looking secret pattern.
cli/errors/errors.spec.jsView on unpkg · L27Findings
3 Critical6 High5 Medium4 Low
CriticalCritical Secretcli/errors/errors.spec.js
CriticalAi Agent Control Hijackcli/mcp/installer.js
CriticalSecret Patterncli/errors/errors.spec.js
HighInstall Time Lifecycle Scriptspackage.json
HighChild Processcli/audit-preflight-git.js
HighShellcli/build/executor.js
HighSame File Env Network Executioncli/license.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
Affected versions and remediation
This report applies to @chem-x/create-chemx@26.9.20-390.
See all versions of @chem-x/create-chemx for other recorded verdicts.
- Avoid installing @chem-x/create-chemx@26.9.20-390. 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: .
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