registry / Install hook abuse / @toothfairyai/tfcode / 2.8.0

@toothfairyai/tfcode@2.8.0

**ToothFairyAI's AI coding agent** — a command-line interface that brings AI-powered coding assistance to your terminal with deep ToothFairyAI workspace integration.

AI Security Review

scanned 5d ago · by lpm-firewall-ai

The postinstall hook performs an automatic user-level Python package installation beyond setting up the platform binary. This warrants a warning about install-time environment changes; inspected source does not establish a malicious payload or credential transfer.

Static reason

One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review

Trigger

Installing the npm package when Python 3 is available.

Impact

The install changes the user's Python environment and may retrieve packages from the configured Python package index.

Mechanism

The postinstall script invokes pip with the user-level install option for the ToothFairyAI SDK and its dependencies.

AI rationale

Evidence

package.jsonpostinstall.mjs

Decision evidence

public snapshot

AI called this Suspicious at 84.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

The package runs a postinstall script during installation.
When Python is available, that script automatically installs the ToothFairyAI SDK and three dependencies into the user's Python environment.

Evidence against

The hook also selects and links the matching ToothFairyAI platform binary, consistent with installing this CLI.
The launcher resolves a matching platform package and forwards the caller's arguments and environment to its binary.

Behavioral surface

Source

ChildProcessEnvironmentVarsFilesystem

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 2 file(s), 10.4 KB of source, external domains: toothfairyai.com

Source & flagged code

6 flagged

package.jsonView file

•scripts.postinstall = node ./postinstall.mjs

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node ./postinstall.mjs

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

7"scripts": { "postinstall": "node ./postinstall.mjs" }, "license": "MIT", "optionalDependencies": { "@toothfairyai

Medium

Suspicious Lifecycle Evidence

The package runs a postinstall script during installation.

package.jsonView on unpkg · L7

python/tf_sync/config.pyView file

•path = python/tf_sync/config.py kind = build_helper sizeBytes = 7012 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

python/tf_sync/config.pyView on unpkg

bin/tfcode.jsView file

•matchType = normalized_sha256 matchedPackage = @toothfairyai/tfcode@2.5.11 matchedPath = bin/tfcode.js matchedIdentity = npm:QHRvb3RoZmFpcnlhaS90ZmNvZGU:2.5.11 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.

bin/tfcode.jsView on unpkg

postinstall.mjsView file

176const pipResult = spawnSync( "python3", ["-m", "pip", "install", "--user", "--break-system-packages", "toothfairyai", "pydantic", "httpx", "rich"], { stdio: "inherit", }, ) if (pipResult.status === 0) { console.log("✓ Python SDK installed") } else { console.log("! Python SDK install failed, run manually:

Medium

Suspicious Dependency Evidence

When Python is available, that script automatically installs the ToothFairyAI SDK and three dependencies into the user's Python environment.

postinstall.mjsView on unpkg · L176

Source & flagged code

6 flagged · loading source

package.jsonView file

•scripts.postinstall = node ./postinstall.mjs

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node ./postinstall.mjs

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

7"scripts": { "postinstall": "node ./postinstall.mjs" }, "license": "MIT", "optionalDependencies": { "@toothfairyai

Medium

Suspicious Lifecycle Evidence

The package runs a postinstall script during installation.

package.jsonView on unpkg · L7

python/tf_sync/config.pyView file

Findings

2 High6 Medium4 Low

HighInstall Time Lifecycle Scriptspackage.json

HighKnown Malware Source Similaritybin/tfcode.js

MediumAmbiguous Install Lifecycle Scriptpackage.json

MediumEnvironment Vars

MediumShips Build Helperpython/tf_sync/config.py

MediumStructural Risk Force Deep Review

MediumSuspicious Lifecycle Evidencepackage.json

MediumSuspicious Dependency Evidencepostinstall.mjs

LowScripts Present

LowFilesystem

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to @toothfairyai/tfcode@2.8.0.

See all versions of @toothfairyai/tfcode for other recorded verdicts.

Review the evidence and your use of @toothfairyai/tfcode@2.8.0 before allowing it. Restrict the permissions described in this report.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.

Evidence last updated: 2026-10-18 03:21:46.295Z (UTC).

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