registry / AI-agent control-surface risk / linkgravity

linkgravity

Discord/Telegram bot bridge for the Antigravity (agy) CLI, with voice interaction support

This report shows the evidence for linkgravity@1.5.3. 2 of 17 known versions are blocked or flagged. The newest version, 1.9.1, is allowed. See all versions.

AI Security Review

scanned 3mo ago · by lpm-firewall-ai

This is a concrete, unconsented postinstall mutation of a foreign broad AI-agent control surface. The documented product purpose does not remove the install-time control-surface impact.

Static reason

One or more suspicious static signals were detected.

Trigger

npm install / npm postinstall

Impact

Alters a foreign, broad AI-agent control surface without an explicit user command; tool-call data is sent to an unauthenticated local-network service.

Mechanism

Global AI-agent hook registration and tool-call interception

Policy narrative

On installation, postinstall creates a persistent virtual environment and calls register-hook. That script writes a wildcard PreToolUse hook and Stop hook into ~/.gemini/config/hooks.json, causing the agent platform to execute package-controlled Python for future tool calls. The PreToolUse hook serializes tool arguments to LinkGravity's approval endpoint, whose server listens on all interfaces without authentication.

AI rationale

This is a concrete, unconsented postinstall mutation of a foreign broad AI-agent control surface. The documented product purpose does not remove the install-time control-surface impact.

Evidence

package.jsonnpm-scripts/postinstall.jsnpm-scripts/register-hook.jshooks/hook.pysrc/api/server.py~/.gemini/config/hooks.json~/.gemini/linkgravity/venv

Network endpoints1

localhost:18080/approve

Decision evidence

public snapshot

AI identified this as a dangerous AI-agent capability at 99.0% confidence with low false-positive risk.

Evidence for policy risk

package.json runs postinstall automatically.
npm-scripts/postinstall.js invokes register-hook during installation.
npm-scripts/register-hook.js writes ~/.gemini/config/hooks.json.
It installs wildcard PreToolUse and Stop hooks pointing to package scripts.
hooks/hook.py receives agent tool arguments and forwards them to localhost:18080.
src/api/server.py binds the approval endpoint on 0.0.0.0:18080 without authentication.

Evidence against

The hook is presented as LinkGravity's Discord-based approval bridge.
No remote payload download or external credential-exfiltration endpoint was found.

Behavioral surface

Source

ChildProcessEnvironmentVarsFilesystemNetworkShell

Supply chain

HighEntropyStringsUrlStrings

ManifestNo manifest risk signals triggered.

scanned 18 file(s), 87.0 KB of source, external domains: 127.0.0.1, github.com, www.google.com

Source & flagged code

7 flagged

package.jsonView file

Lines 1-26json

2 "name": "linkgravity",

3 "version": "1.5.3",

4 "description": "Discord/Telegram bot bridge for the Antigravity (agy) CLI, with voice interaction support",

5 "scripts": {

6 "postinstall": "node npm-scripts/postinstall.js",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L6

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L6

7 "start": "node npm-scripts/run-dev.js",

8 "dev": "node npm-scripts/run-dev.js",

9 "format": "prettier --write \"bin/**/*.js\" \"npm-scripts/**/*.js\" \"voice-service/*.js\"",

10 "format:check": "prettier --check \"bin/**/*.js\" \"npm-scripts/**/*.js\" \"voice-service/*.js\"",

11 "prepare": "node npm-scripts/prepare.js"

12 },

13 "author": "dev-sseul",

14 "license": "MIT",

15 "repository": {

16 "type": "git",

17 "url": "git+https://github.com/dev-sseul/linkgravity.git"

18 },

19 "homepage": "https://github.com/dev-sseul/linkgravity#readme",

20 "bugs": {

21 "url": "https://github.com/dev-sseul/linkgravity/issues"

22 },

23 "keywords": [

24 "discord",

25 "discord-bot",

26 "telegram",

voice-service/stt.jsView file

Lines 1-25javascript

1const { spawn } = require('child_process');

2const ffmpegPath = require('ffmpeg-static');

4// Unofficial Google STT key - same default Python's SpeechRecognition (recognize_google) ships with.

5const

npm-scripts/postinstall.jsView file

Lines 1-21javascript

1const { execSync } = require('child_process');

2const os = require('os');

High

Child Process

Package source references child process execution.

npm-scripts/postinstall.jsView on unpkg · L1

3const

bin/cli.jsView file

Lines 19-59javascript

19const cmd = process.argv[2];

21const color = {

22 reset: '\x1b[0m',

23 green: '\x1b[32m',

hooks/hook.pyView file

•path = hooks/hook.py kind = build_helper sizeBytes = 1997 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

hooks/hook.pyView on unpkg

Source & flagged code

7 flagged · loading source

package.jsonView file

•scripts.postinstall = node npm-scripts/postinstall.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node npm-scripts/postinstall.js

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

voice-service/stt.jsView file

5patternName = google_api_key severity = high line = 5 matchedText = const GO...gw';

High

High Secret

Package contains a high-severity secret pattern.

voice-service/stt.jsView on unpkg · L5

Findings

6 High5 Medium5 Low

HighInstall Time Lifecycle Scriptspackage.json

HighHigh Secretvoice-service/stt.js

HighChild Processnpm-scripts/postinstall.js

HighShell

HighRuntime Package Installbin/cli.js

HighSecret Patternvoice-service/stt.js

MediumAmbiguous Install Lifecycle Scriptpackage.json

MediumNetwork

MediumEnvironment Vars

MediumShips Build Helperhooks/hook.py

MediumStructural Risk Force Deep Review

LowNon Install Lifecycle Scripts

LowScripts Present

LowFilesystem

LowHigh Entropy Strings

Affected versions and remediation

This report applies to linkgravity@1.5.3.

The versions list below shows the verdict for each recorded version.

Avoid installing linkgravity@1.5.3. 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: 2026-08-04 02:47:35.772Z (UTC).

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

Versions

17 known versions

1.9.1latestUnknown—AllowUnder ReviewSep 22, 2026, 3:41 PM 1.9.0Unknown—AllowUnder ReviewSep 21, 2026, 12:49 PM 1.8.0Suspicious—WarnPublishedSep 3, 2026, 2:50 PM 1.7.5Suspicious—WarnPublishedAug 26, 2026, 4:21 AM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other AI-agent control-surface risk packages

Runtime surface

Behavioral surface

Related packages

Other AI-agent control-surface risk packages

Source & flagged code