@chem-x/starter-kit@26.9.21-227
Chemical X Protocol: Private drop-in architecture starter kit and capsule generator
AI Security Review
scanned 11d ago · by lpm-firewall-aiThe package automatically writes agent server configuration during npm postinstall without a consent guard, which meets the policy for blocking unconsented lifecycle mutation of an AI-agent control surface. The evidence establishes control-surface mutation, not credential theft or a malicious network endpoint.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
Installing the package through npm runs its postinstall hook.
Impact
The registered server becomes available to the associated agents, altering their configured capabilities without an explicit setup action.
Mechanism
The hook invokes the MCP installer, which writes project MCP configuration and, when the user's Antigravity configuration directory exists, merges a server entry into its configuration.
Policy narrative
During npm installation, the postinstall hook calls the MCP installer for the consumer directory. It registers the package's MCP server in Cursor and VS Code project settings, and can also update an existing user Antigravity configuration. The registration is not gated by an explicit consent prompt.
AI rationale
The package automatically writes agent server configuration during npm postinstall without a consent guard, which meets the policy for blocking unconsented lifecycle mutation of an AI-agent control surface. The evidence establishes control-surface mutation, not credential theft or a malicious network endpoint.
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 97.0% confidence with low false-positive risk.
Evidence for policy risk
- package.json runs cli/postinstall.js as an npm postinstall hook.
- The hook invokes installAllMcpConfigs for the consumer directory without a consent check.
- The invoked installer registers an MCP server in project agent settings and may also update the user's Antigravity configuration.
- When no local starter-kit CLI is found, the registered server runs npx -y chemx mcp.
- The installer also contains code that adds behavior-bearing directives to AGENTS.md, but that helper is not called by this postinstall hook.
Evidence against
- The configuration targets this package's MCP server, and the Antigravity write is conditional on an existing configuration directory.
- The AGENTS.md directive helper is used by a separate installer flow, not by the postinstall path.
Behavioral surface
ChildProcessEnvironmentVarsFilesystemNetworkShell
HighEntropyStringsUrlStrings
Source & flagged code
10 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 Critical5 High5 Medium5 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/pillars-wizard.js
MediumAmbiguous Install Lifecycle Scriptpackage.json
MediumNetwork
MediumEnvironment Vars
MediumShips Build Helperscripts/pre-commit.sh
Affected versions and remediation
This report applies to @chem-x/starter-kit@26.9.21-227.
See all versions of @chem-x/starter-kit for other recorded verdicts.
- Avoid installing @chem-x/starter-kit@26.9.21-227. 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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