registry / Install hook abuse / @toothfairyai/tfcode / 2.7.5

@toothfairyai/tfcode@2.7.5

**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 7d ago · by lpm-firewall-ai

The inspected source supports a warning for automatic Python package installation into the user's environment during npm postinstall. The behavior is labeled and product-aligned, and no concrete credential exfiltration or other attack was found.

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 python3 is available.

Impact

This expands installation beyond the npm package and adds unpinned Python packages to the user's environment.

Mechanism

The hook runs pip install with --user and --break-system-packages for the ToothFairyAI SDK and dependencies.

AI rationale

Evidence

package.jsonpostinstall.mjs

Decision evidence

public snapshot

AI called this Suspicious at 87.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

package.json runs postinstall and declares platform-specific ToothFairyAI packages as optional dependencies.
The launcher resolves the matching ToothFairyAI platform package and passes command-line arguments to its binary.
During postinstall, if Python is available, the package invokes pip with --user and --break-system-packages to install the SDK and dependencies.
The Python integration uses the configured API key and workspace ID with region-specific ToothFairyAI service URLs.

Evidence against

The automatic Python installation is labeled as ToothFairyAI SDK setup and installs named integration dependencies.
The inspected source does not show credentials being sent to an unrelated recipient.

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": "2.7.5",

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": "2.7.5",

13 "@toothfairyai/tfcode-windows-x64": "2.7.5",

14 "@toothfairyai/tfcode-linux-x64-baseline-musl": "2.7.5",

Medium

Suspicious Lifecycle Evidence

package.json runs postinstall and declares platform-specific ToothFairyAI packages as optional dependencies.

package.jsonView on unpkg · L7

15 "@toothfairyai/tfcode-darwin-x64-baseline": "2.7.5",

16 "@toothfairyai/tfcode-linux-x64-musl": "2.7.5",

17 "@toothfairyai/tfcode-windows-x64-baseline": "2.7.5",

18 "@toothfairyai/tfcode-linux-arm64-musl": "2.7.5",

19 "@toothfairyai/tfcode-windows-arm64": "2.7.5",

20 "@toothfairyai/tfcode-linux-x64": "2.7.5",

21 "@toothfairyai/tfcode-darwin-x64": "2.7.5",

22 "@toothfairyai/tfcode-linux-x64-baseline": "2.7.5",

23 "@toothfairyai/tfcode-darwin-arm64": "2.7.5"

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

40let binaryPath try { const dir = path.dirname(require.resolve('@toothfairyai/' + target + '/package.json')) const candidate = path.join(dir, 'bin', binName) if (fs.existsSync(candidate)) binaryPath = candidate }

Medium

Ai Review Evidence

The launcher resolves the matching ToothFairyAI platform package and passes command-line arguments to its binary.

bin/tfcode.jsView on unpkg · L40

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/tfcode-linux-arm64": "2.7.5", "@toothfairyai/tfcode-windows-x64": "2.7.5", "@toot

Medium

Suspicious Lifecycle Evidence

package.json runs postinstall and declares platform-specific ToothFairyAI packages as optional dependencies.

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

MediumAi Review Evidencebin/tfcode.js

LowScripts Present

LowFilesystem

LowHigh Entropy Strings

LowUrl Strings

Affected versions and remediation

This report applies to @toothfairyai/tfcode@2.7.5.

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

Review the evidence and your use of @toothfairyai/tfcode@2.7.5 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: 2026-10-15 18:20:00.761Z (UTC).

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