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claude-token-saver@3.27.1: AI-agent control-surface risk | LPM Firewall

registry / claude-token-saver / 3.27.1

claude-token-saver@3.27.1

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 1mo ago · by lpm-firewall-ai

LPM flags this version as an AI-agent control-surface risk. Installing the package automatically modifies the user-wide Claude Code control surface. It installs a skill, status-line command, hooks, and global instruction files without consent in non-interactive installs.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review; previous stored version diff introduced dangerous source

Trigger

npm postinstall during package installation.

Impact

Future Claude Code sessions and prompts invoke package commands and load package-authored instructions across projects.

Mechanism

Automatic writes to user-wide Claude Code skills, settings hooks, and instructions.

Policy narrative

npm invokes the postinstall hook, which runs the installer. When no terminal is available, the installer preserves automatic defaults, writes its package-controlled skill, registers session-start and prompt-submit commands in Claude Code settings, and appends global instructions that apply to every project. This creates persistent package-controlled behavior in a separate AI-agent control surface without explicit consent.

AI rationale

This is a concrete unconsented postinstall mutation of a broad, foreign AI-agent control surface. The absence of observed credential exfiltration does not neutralize the persistent control-surface changes.

Evidence

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

Source & flagged code

9 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

bin/cli.jsView file

10Install-time code directly mutates a foreign AI-agent control surface: L186: L187: // Subcommand: harness — manage the project's CLAUDE.md harness rules. L188: // claude-token-saver harness init # write CLAUDE.md (5 sections) + ratchet.md L189: // claude-token-saver harness uninit # remove harness block from CLAUDE.md (backup kept) L190: // claude-token-saver harness check # show 🅷 N/5 + which sections are missing ... L201: // claude-token-saver compact-window # status L202: // claude-token-saver compact-window set --global # pin 200k (~/.claude/settings.json) L203: // claude-token-saver compact-window set --project # pin 200k (<root>/.claude/settings.json) L204: // claude-token-saver compact-window off | on # toggle the status

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@3.26.1 matchedPath = src/korean-style.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.26.1 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

•matchType = previous_version_dangerous_delta matchedPackage = claude-token-saver@3.4.3 matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.4.3 similarity = 0.462 summary = stored previous version shares package body but lacks this dangerous source file

High

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

src/korean-style.jsView on unpkg

src/update-check.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.25.1 matchedPath = src/update-check.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.25.1 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/update-check.jsView on unpkg

src/model-alias.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.26.1 matchedPath = src/model-alias.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.26.1 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/model-alias.jsView on unpkg

Source & flagged code

9 flagged

package.jsonView file

Lines 1-32json

1{

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

3 "version": "3.27.1",

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",

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@3.26.1 matchedPath = src/korean-style.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.26.1 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

•matchType = previous_version_dangerous_delta matchedPackage = claude-token-saver@3.4.3 matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.4.3 similarity = 0.462 summary = stored previous version shares package body but lacks this dangerous source file

High

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

src/korean-style.jsView on unpkg

src/update-check.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.25.1 matchedPath = src/update-check.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.25.1 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/update-check.jsView on unpkg

src/model-alias.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.26.1 matchedPath = src/model-alias.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.26.1 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/model-alias.jsView on unpkg