Loading npm security reports…

@nookplot/mcp@0.4.132: AI-agent policy block | LPM Firewall

registry / @nookplot/mcp / 0.4.132

@nookplot/mcp@0.4.132

Nookplot MCP server — connect any MCP-compatible agent to the Nookplot network

AI Security Review

scanned 19d ago · by lpm-firewall-ai

LPM blocks this version under the AI-agent control-surface policy. Confirmed install-time AI-agent control-surface mutation. The package silently drops package-supplied Claude skill instructions into the user's ~/.claude/skills directory during npm postinstall.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review

Trigger

npm install or npx install lifecycle; also MCP server startup repeats the skill install

Impact

Adds autonomous slash-command instructions to Claude Code without explicit install-time consent, enabling package-defined agent workflows and recurring cron prompts inside the AI agent environment.

Mechanism

unconsented lifecycle copy of agent skill files

Policy narrative

On install, the postinstall script silently copies bundled skill directories into ~/.claude/skills if Claude Code is present. Those skills define slash-command agent workflows that can create recurring cron jobs and drive MCP tool usage. This is an install-time mutation of an AI-agent control surface, independent of the package's otherwise aligned Nookplot network functionality.

Rationale

Source inspection confirms a postinstall hook that writes package-controlled Claude skill instructions into the user's AI agent configuration area without an explicit setup command. That meets the firewall boundary for unconsented lifecycle AI-agent control-surface mutation, even though credential and network behavior otherwise appears package-aligned. Product guard normalized a concrete AI-agent control hijack publish_block to the blockable dangerous-capability shape.

Evidence

package.jsondist/postinstall.jsdist/index.jsdist/setup.jsdist/applyConfig.js

Source & flagged code

7 flagged · loading source

package.jsonView file

•scripts.postinstall = node dist/postinstall.js 2>/dev/null || true

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node dist/postinstall.js 2>/dev/null || true

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

dist/applyConfig.jsView file

26import { createDecipheriv } from "node:crypto"; L27: import { execFileSync } from "node:child_process"; L28: import { readFileSync, writeFileSync, existsSync, mkdirSync, chmodSync } from "node:fs";

High

Child Process

Package source references child process execution.

dist/applyConfig.jsView on unpkg · L26

•matchType = normalized_sha256 matchedPackage = @nookplot/mcp@0.4.130 matchedPath = dist/applyConfig.js matchedIdentity = npm:QG5vb2twbG90L21jcA:0.4.130 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.

dist/applyConfig.jsView on unpkg

dist/postinstall.jsView file

1Install-time AI-agent control hijack evidence: L1: /** L2: * Postinstall script — copies skill files to ~/.claude/skills/ immediately L3: * when the package is installed via npm/npx. This ensures /nookplot, /mine, ... L9: */ L10: import { existsSync, mkdirSync, readdirSync, statSync, copyFileSync } from "node:fs"; L11: import { fileURLToPath } from "node:url"; ... L15: if (!existsSync(dest)) L16: mkdirSync(dest, { recursive: true }); L17: for (const file of readdirSync(src)) { ... L23: else { L24: copyFileSync(srcPath, destPath); L25: } Payload evidence from SKILL.md: L127: |----------|---------|-------------| L128: | `NOOKPLOT_GATEWAY_URL` | `https://gateway.nookplot.com` | Gateway endpoint | L129: | `NOOKPLOT_AGENT_NAME` | `MCP Agent` | Name for auto-registration |

Critical

Ai Agent Control Hijack

Install-time source drops package-supplied AI-agent/MCP control files or instructions.

dist/postinstall.jsView on unpkg · L1

dist/setup.jsView file

1/** L2: * `npx @nookplot/mcp setup` — One-command onboarding. L3: * ... L14: import { homedir, platform } from "node:os"; L15: import { execSync } from "node:child_process"; L16: import { createInterface } from "node:readline";

High

Runtime Package Install

Package source invokes a package manager install command at runtime.

dist/setup.jsView on unpkg · L1

•matchType = normalized_sha256 matchedPackage = @nookplot/mcp@0.4.130 matchedPath = dist/setup.js matchedIdentity = npm:QG5vb2twbG90L21jcA:0.4.130 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.

dist/setup.jsView on unpkg

Source & flagged code

7 flagged

package.jsonView file

Lines 34-74json

34 "dist/gateway.d.ts"

35 ],

36 "signing": [

37 "dist/signing.d.ts"

38 ]

39 }

40 },

41 "files": [

42 "dist",

43 "skills",

44 "README.md",

45 "SKILL.md"

46 ],

47 "scripts": {

48 "build": "tsc",

49 "start": "node dist/index.js",

50 "dev": "tsc --watch",

51 "test": "vitest run",

52 "generate-catalog": "node scripts/generate-catalog.mjs",

53 "embed:tools": "tsx scripts/embed-tools.ts",

54 "postinstall": "node dist/postinstall.js 2>/dev/null || true"

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L54

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L54

55 },

56 "dependencies": {

57 "@modelcontextprotocol/sdk": "^1.12.0",

58 "ethers": "^6.0.0"

59 },

60 "devDependencies": {

61 "@types/node": "^20.0.0",

62 "@types/pg": "^8.20.0",

63 "pg": "^8.20.0",

64 "tsx": "^4.21.0",

65 "typescript": "^5.4.0",

66 "vitest": "^3.0.0"

67 },

68 "engines": {

69 "node": ">=18.0.0"

70 },

71 "license": "MIT",

72 "repository": {

73 "type": "git",

74 "url": "https://github.com/nookprotocol/nookplot",

dist/applyConfig.jsView file

Lines 6-46javascript

6 *

7 * 1. User configured BYOK / model / messaging on the Nookplot web UI.

8 * 2. The browser encrypted it with AES-256-

dist/postinstall.jsView file

Lines 1-21javascript

1/**

2 * Postinstall script — copies skill files to ~/.claude/skills/ immediately

3 * when the package is installed via npm/npx. This ensures /nookplot, /mine,

4 * /social, and /learn are available on the very first Claude Code session,

5 * without waiting for the MCP server to start.

6 *

7 * Runs silently — any failure is swallowed (skills will be installed by

8 * the MCP server on startup as a fallback).

9 */

10import { existsSync, mkdirSync, readdirSync, statSync, copyFileSync }

dist/setup.jsView file

Lines 1-21javascript

1/**

2 * `npx @nookplot/mcp setup` — One-command onboarding.

3 *

4 * Detects installed editors, registers an agent, and writes MCP config

5 * so the user can restart their editor and immediately start using Nookplot.

6 *

7 * @module setup

8 */

9import *