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claude-token-saver@3.31.0: Malicious npm security report (Block) | LPM Firewall

registry / claude-token-saver / 3.31.0

claude-token-saver@3.31.0

Route the easy work your expensive Claude model keeps repeating down to haiku/sonnet — post-hoc session analysis, no realtime router, no extra LLM calls.

AI Security Review

scanned 26d ago · by lpm-firewall-ai

Installing the package automatically changes the user's global Claude Code control surface. It installs a package-controlled skill, command hooks, status line, and global instruction content.

Static reason

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

Trigger

npm postinstall runs `node bin/cli.js install` during package installation.

Impact

Future Claude Code sessions can execute this package's commands and consume its injected instructions across projects without an interactive setup decision.

Mechanism

Automatic lifecycle installation of global Claude Code skills, hooks, status-line commands, and instructions.

Attack narrative

The npm postinstall hook invokes the installer automatically. In unattended installation contexts, the code intentionally uses automatic defaults, installs a global Claude Code skill, registers command hooks and a status line, and appends package-controlled instructions to the global Claude Code instruction file. This creates persistent execution and instruction influence in future Claude Code sessions across projects without an explicit user setup action.

AI rationale

This is concrete unconsented postinstall mutation of a broad AI-agent control surface. The lifecycle hook persists package-controlled commands and instructions globally, meeting the install-hook-abuse block policy.

Evidence

package.jsonsrc/commands/install.jssrc/installer.jssrc/harness.js~/.claude/settings.json~/.claude/skills/claude-token-saver/SKILL.md~/.claude/CLAUDE.md~/.claude/CLAUDE.md.bak-<timestamp>

Source & flagged code

10 flagged · loading source

package.jsonView file

•scripts.postinstall = node bin/cli.js install || true

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node bin/cli.js install || true

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

src/doc2md.cjsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.34.0 matchedPath = src/doc2md.cjs matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.34.0 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.

src/doc2md.cjsView on unpkg

24L25: const fs = require('node:fs'); L26: const os = require('node:os');

Medium

Dynamic Require

Package source references dynamic require/import behavior.

src/doc2md.cjsView on unpkg · L24

bin/cli.jsView file

10Install-time code directly mutates a foreign AI-agent control surface: L103: claude-token-saver uninstall remove everything install added L104: claude-token-saver harness check score the harness setup in CLAUDE.md L105: claude-token-saver harness analyze run the harness transcript analysis manually ... L226: L227: // Subcommand: harness — manage the project's CLAUDE.md harness rules. L228: // claude-token-saver harness init # write CLAUDE.md (5 sections) + ratchet.md L229: // claude-token-saver harness uninit # remove harness block from CLAUDE.md (backup kept) L230: // claude-token-saver harness check # show 🅷 N/5 + which sections are missing ... L241: // claude-token-saver compact-window # status L242: // claude-token-saver comp

Critical

Ai Agent Control Hijack

Source creates an unconsented AI-agent control surface through install-time mutation or a default unauthenticated remote skill channel.

bin/cli.jsView on unpkg · L10

examples/statusline-command.ps1View file

•path = examples/statusline-command.ps1 kind = build_helper sizeBytes = 1619 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

examples/statusline-command.ps1View on unpkg

src/advice.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 4

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

src/advice.js#virtual:normalized:round1View on unpkg

src/korean-style.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.27.1 matchedPath = src/korean-style.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.27.1 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.

src/korean-style.jsView on unpkg

src/update-check.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.34.0 matchedPath = src/update-check.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.34.0 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.

src/update-check.jsView on unpkg

src/model-alias.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.34.0 matchedPath = src/model-alias.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.34.0 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.

src/model-alias.jsView on unpkg

Source & flagged code

10 flagged

package.jsonView file

Lines 1-32json

1{

2 "name": "claude-token-saver",

3 "version": "3.31.0",

4 "description": "Route the easy work your expensive Claude model keeps repeating down to haiku/sonnet — post-hoc session analysis, no realtime router, no extra LLM calls.",

5 "type": "module",

6 "bin": {

7 "claude-token-saver": "bin/cli.js"

8 },

9 "scripts": {

10 "test": "node --test",

11 "docs:statusline": "node scripts/docs-statusline.mjs",

12 "postinstall": "node bin/cli.js install || true"

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L12

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L12

13 },

14 "files": [

15 "bin/",

16 "src/",

17 "presets/",

18 "examples/",

19 "README.md",

20 "README.en.md",

21 "LICENSE"

22 ],

23 "engines": {

24 "node": ">=18"

25 },

26 "keywords": [

27 "claude",

28 "claude-code",

29 "anthropic",

30 "model-routing",

31 "llm-router",

32 "delegation",

src/doc2md.cjsView file

Lines 4-44javascript

4 *

5 * A pptx or xlsx read straight into the context window is close to the worst

6 * thing a token-saving tool can allow: the bytes are unreadable to the model,

7 * so it either gets nothing useful or spends a fortune finding that out. This

8 * intercepts the Read, converts the file once, caches the result, and points

bin/cli.jsView file

Lines 1-30javascript

1#!/usr/bin/env node

2

3/**

4 * claude-token-saver CLI (formerly claude-cache-monitor)

5 *

6 * Usage:

7 * npx claude-token-saver # default report (last 30 days)

8 * npx claude-token-saver --days 7 # last 7 days

9 * npx claude-token-saver --format json # JSON output

10 * npx claude-token-saver --format csv # CSV output

11 * npx claude-token-saver --project myproj # filter by project

examples/statusline-command.ps1View file

•path = examples/statusline-command.ps1 kind = build_helper sizeBytes = 1619 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

examples/statusline-command.ps1View on unpkg

src/advice.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 4

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

src/advice.js#virtual:normalized:round1View on unpkg

src/korean-style.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.27.1 matchedPath = src/korean-style.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.27.1 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.

src/korean-style.jsView on unpkg

src/update-check.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.34.0 matchedPath = src/update-check.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.34.0 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.

src/update-check.jsView on unpkg

src/model-alias.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.34.0 matchedPath = src/model-alias.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.34.0 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.

src/model-alias.jsView on unpkg