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claude-token-saver@3.39.0: AI-agent control-surface risk | LPM Firewall

registry / claude-token-saver / 3.39.0

claude-token-saver@3.39.0

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

LPM flags this version as an AI-agent control-surface risk. Installing the package automatically alters the user's global Claude Code control surface. It adds persistent skills, hooks, a statusline command, and global model instructions.

Static reason

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

Trigger

npm postinstall during package installation

Impact

Future Claude Code sessions can invoke package-controlled commands and consume package-authored instructions across projects without install-time consent.

Mechanism

automatic global Claude Code configuration and instruction injection

Policy narrative

The package's postinstall invokes its install subcommand. That path writes a package-controlled skill, modifies the global Claude settings to add lifecycle hooks and a statusline command, and appends global instructions used across projects. It also installs document hooks automatically. These are persistent modifications to a broad AI-agent control surface made during dependency installation, not an explicit user setup action.

AI rationale

Source inspection confirms unconsented postinstall mutation of global Claude Code configuration and instructions. This meets the install-control-surface blocking policy even though no credential theft or opaque payload was found.

Evidence

package.jsonbin/cli.jssrc/commands/install.jssrc/installer.js~/.claude/settings.json~/.claude/skills/claude-token-saver/SKILL.md~/.claude/CLAUDE.md~/.claude/commands/token-monitor.md

Source & flagged code

17 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

28const crypto = require('node:crypto'); L29: const { spawn, spawnSync } = require('node:child_process'); L30: const ledger = require('./doc2md-ledger.cjs');

High

Child Process

Package source references child process execution.

src/doc2md.cjsView on unpkg · L28

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.30.1 matchedPath = src/doc2md.cjs matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.30.1 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/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

src/commands/upgrade.jsView file

20// resolution to find the same npm that installed us. L21: const child = spawn(cmd, { shell: true, stdio: 'inherit' }); L22: child.on('close', (code) => resolve(code === null ? 1 : code));

High

Shell

Package source references shell execution.

src/commands/upgrade.jsView on unpkg · L20

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

src/commands/feedback.jsView file

56if (auth.status !== 0) return null; L57: const res = spawnSync('gh', ['issue', 'create', '-R', REPO, '--title', title, '--body', body], L58: { encoding: 'utf8', timeout: 30_000 }); L59: if (res.status !== 0) { debug('feedback:gh', res.stderr); return null; } L60: const url = String(res.stdout).trim().split('\n').pop(); ... L67: try { L68: const params = new URLSearchParams(); L69: params.set(FORM.message, `${title}\n\n${body}`); L70: params.set(FORM.meta, meta); L71: const res = await fetch(`https://docs.google.com/forms/d/e/${FORM.id}/formResponse`, { L72: method: 'POST',

High

Command Output Exfiltration

Source combines command execution, command-output handling, and outbound requests; review data flow before blocking.

src/commands/feedback.jsView on unpkg · L56

21L22: import { spawnSync } from 'node:child_process'; L23: import { writeFileSync, mkdirSync } from 'node:fs'; ... L28: const REPO = 'rootstudioyaml/claude-token-saver'; L29: const ISSUES_URL = `https://github.com/${REPO}/issues`; L30: ... L47: `version: ${version}`, L48: `os: ${process.platform} ${os.release()}`, L49: `node: ${process.version}`, ... L58: { encoding: 'utf8', timeout: 30_000 }); L59: if (res.status !== 0) { debug('feedback:gh', res.stderr); return null; } L60: const url = String(res.stdout).trim().split('\n').pop();

High

Sandbox Evasion Gated Capability

Source gates dangerous network, credential, or execution behavior behind CI, host, platform, time, or geo fingerprint checks.

src/commands/feedback.jsView on unpkg · L21

56Trigger-reachable command-output exfiltration chain: scripts.postinstall -> bin/cli.js -> src/commands/feedback.js L56: if (auth.status !== 0) return null; L57: const res = spawnSync('gh', ['issue', 'create', '-R', REPO, '--title', title, '--body', body], L58: { encoding: 'utf8', timeout: 30_000 }); L59: if (res.status !== 0) { debug('feedback:gh', res.stderr); return null; } L60: const url = String(res.stdout).trim().split('\n').pop(); ... L67: try { L68: const params = new URLSearchParams(); L69: params.set(FORM.message, `${title}\n\n${body}`); L70: params.set(FORM.meta, meta); L71: const res = await fetch(`https://docs.google.com/forms/d/e/${FORM.id}/formResponse`, { L72: method: 'POST',

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 ... L251: L252: // Subcommand: harness — manage the project's CLAUDE.md harness rules. L253: // claude-token-saver harness init # write CLAUDE.md (5 sections) + ratchet.md L254: // claude-token-saver harness uninit # remove harness block from CLAUDE.md (backup kept) L255: // claude-token-saver harness check # show 🅷 N/5 + which sections are missing ... L266: // claude-token-saver compact-window # status L267: // 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@3.37.0 matchedPath = src/korean-style.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.37.0 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/korean-style.jsView on unpkg

src/litellm-budget.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.37.0 matchedPath = src/litellm-budget.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.37.0 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/litellm-budget.jsView on unpkg

src/update-check.jsView file

•matchType = normalized_sha256 matchedPackage = claude-token-saver@3.30.1 matchedPath = src/update-check.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.30.1 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@3.30.1 matchedPath = src/model-alias.js matchedIdentity = npm:Y2xhdWRlLXRva2VuLXNhdmVy:3.30.1 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