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claude-token-saver@3.35.0: AI-agent control-surface risk | LPM Firewall

registry / claude-token-saver / 3.35.0

claude-token-saver@3.35.0

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 28d ago · by lpm-firewall-ai

LPM flags this version as an AI-agent control-surface risk. Installing the package runs an unprompted setup that changes the user's global Claude Code control surface. It installs hooks, a statusline command, a skill, 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 during package installation, including unattended installs.

Impact

Future Claude Code sessions can run package commands and receive package-authored instructions without explicit setup consent.

Mechanism

Automatic mutation of global Claude Code configuration and instruction files.

Policy narrative

The postinstall hook invokes the install command automatically. When no interactive terminal is available, the command uses automatic defaults, writes Claude Code hooks and a statusline to ~/.claude/settings.json, creates a skill, and appends package-authored rules to ~/.claude/CLAUDE.md. This changes a broad, global AI-agent control surface on ordinary dependency installation.

AI rationale

This is a concrete unconsented postinstall mutation of global Claude Code configuration and instructions. The package's registry update check does not mitigate the lifecycle control-surface takeover.

Evidence

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

Source & flagged code

8 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

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

src/seed-rules.jsView file

53try { L54: const data = JSON.parse(readFileSync(seedStatePath(), 'utf8')); L55: return data && typeof data.decided === 'object' && data.decided ? data : { decided: {} };

Low

Weak Crypto

Package source references weak cryptographic algorithms.

src/seed-rules.jsView on unpkg · L53

bin/cli.jsView file

10Install-time code directly mutates a foreign AI-agent control surface: L104: claude-token-saver uninstall remove everything install added L105: claude-token-saver harness check score the harness setup in CLAUDE.md L106: claude-token-saver harness analyze run the harness transcript analysis manually ... L234: L235: // Subcommand: harness — manage the project's CLAUDE.md harness rules. L236: // claude-token-saver harness init # write CLAUDE.md (5 sections) + ratchet.md L237: // claude-token-saver harness uninit # remove harness block from CLAUDE.md (backup kept) L238: // claude-token-saver harness check # show 🅷 N/5 + which sections are missing ... L249: // claude-token-saver compact-window # status L250: // 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/model-alias.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.27.1 matchedPath = src/model-alias.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/model-alias.jsView on unpkg

Source & flagged code

8 flagged

package.jsonView file

Lines 1-32json

1{

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

3 "version": "3.35.0",

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

src/seed-rules.jsView file

Lines 33-73javascript

33 addModelRule,

34 composeRuleText,

35 loadModelRules,

36 modelRuleBaseText,

37 syncAllFiles,

38} from './model-rules.js';

39import {

40 findProjectRoot,

41 harnessListRules,

42 harnessPromote,

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/model-alias.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.27.1 matchedPath = src/model-alias.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/model-alias.jsView on unpkg