registry / Install hook abuse / @toothfairyai/tfcode / 2.7.3

@toothfairyai/tfcode@2.7.3

**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 12d ago · by lpm-firewall-ai

The automatic pip installation is a meaningful install-time side effect and warrants a warning. Source inspection found no concrete attack behavior to support blocking this release.

Static reason

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

Trigger

Installing the npm package runs its postinstall hook; the pip command runs when Python 3 is available.

Impact

The install can add or alter packages in the user's Python environment and retrieve packages through pip's configured index.

Mechanism

The hook invokes pip with --user and --break-system-packages to install ToothFairyAI and supporting libraries.

AI rationale

The automatic pip installation is a meaningful install-time side effect and warrants a warning. Source inspection found no concrete attack behavior to support blocking this release.

Evidence

package.jsonpostinstall.mjsbin/tfcode.js

Decision evidence

public snapshot

AI called this Suspicious at 86.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

package.json runs postinstall.mjs automatically during installation.
When Python is present, postinstall.mjs runs pip to install ToothFairyAI and supporting libraries into the user site, allowing system packages to be modified.
The CLI forwards its arguments and environment to the selected platform binary.

Evidence against

The launcher selects a platform-specific optional dependency and starts its binary with inherited standard streams.
Inspected Python sources use ToothFairyAI region endpoints and do not establish credential exfiltration or another concrete attack.

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

Lines 1-28json

2 "name": "@toothfairyai/tfcode",

3 "version": "2.7.3",

4 "bin": {

5 "tfcode": "./bin/tfcode.js"

6 },

7 "scripts": {

8 "postinstall": "node ./postinstall.mjs"

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L8

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L8

9 },

10 "license": "MIT",

11 "optionalDependencies": {

12 "@toothfairyai/tfcode-linux-arm64": "2.7.3",

13 "@toothfairyai/tfcode-windows-x64": "2.7.3",

Medium

Suspicious Lifecycle Evidence

package.json runs postinstall.mjs automatically during installation.

package.jsonView on unpkg · L8

14 "@toothfairyai/tfcode-linux-x64-baseline-musl": "2.7.3",

15 "@toothfairyai/tfcode-darwin-x64-baseline": "2.7.3",

16 "@toothfairyai/tfcode-linux-x64-musl": "2.7.3",

17 "@toothfairyai/tfcode-windows-x64-baseline": "2.7.3",

18 "@toothfairyai/tfcode-linux-arm64-musl": "2.7.3",

19 "@toothfairyai/tfcode-windows-arm64": "2.7.3",

20 "@toothfairyai/tfcode-linux-x64": "2.7.3",

21 "@toothfairyai/tfcode-darwin-x64": "2.7.3",

22 "@toothfairyai/tfcode-linux-x64-baseline": "2.7.3",

23 "@toothfairyai/tfcode-darwin-arm64": "2.7.3"

24 },

25 "engines": {

26 "node": ">=18"

27 },

28 "homepage": "https://toothfairyai.com/developers/tfcode",

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

Lines 148-188javascript

148 if (fs.existsSync(targetAppDir)) fs.rmSync(targetAppDir, { recursive: true, force: true })

149 fs.cpSync(srcAppDir, targetAppDir, { recursive: true })

150 console.log("Web app copied from platform package")

151 } else

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

8"postinstall": "node ./postinstall.mjs" }, "license": "MIT", "optionalDependencies": { "@toothfairyai/tfcode-linux-arm64": "2.7.3", "@toothfairyai/tfcode-windows-x64"

Medium

Suspicious Lifecycle Evidence

package.json runs postinstall.mjs automatically during installation.

package.jsonView on unpkg · L8

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 Lifecycle Evidencepostinstall.mjs

LowScripts Present

LowFilesystem

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to @toothfairyai/tfcode@2.7.3.

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

Review the evidence and your use of @toothfairyai/tfcode@2.7.3 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: 2026-10-11 09:16:46.417Z (UTC).

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