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amicus@4.9.7: AI-agent control-surface risk | LPM Firewall

registry / amicus / 4.9.7

amicus@4.9.7

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AI Security Review

scanned 29d ago · by lpm-firewall-ai

LPM flags this version as an AI-agent control-surface risk. Installing the package automatically changes user-level Claude agent configuration and copies agent skills. The resulting configuration launches a moving latest package release through npx.

Static reason

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

Trigger

npm installation, via postinstall

Impact

A dependency install can alter Claude Code and Claude Desktop control surfaces and cause later agent sessions to run amicus@latest.

Mechanism

automatic user-level Claude MCP and skill registration

Policy narrative

During npm postinstall, the package calls its skill and MCP registration routines. Those routines copy skills into the user Claude directory and add or replace an amicus MCP entry in Claude Code and Claude Desktop configuration. The entry executes npx -y amicus@latest, so a future agent launch may resolve a changing release rather than the installed package version. This is an unconsented install-time mutation of broad AI-agent control surfaces.

AI rationale

The package performs automatic postinstall mutation of user-level Claude agent configuration and installs skills, then registers a command that resolves amicus@latest. This meets the install-control-surface block policy regardless of the package's stated purpose.

Evidence

package.jsonscripts/postinstall.jssrc/utils/claude-register.js~/.claude/skills/sidecar/SKILL.md~/.claude/skills/second-opinion/~/.claude.json~/Library/Application Support/Claude/claude_desktop_config.json

Source & flagged code

18 flagged · loading source

package.jsonView file

•scripts.postinstall = node scripts/postinstall.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node scripts/postinstall.js

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

bin/amicus.jsView file

10// Node version guard: fail fast on unsupported Node versions L11: const { checkNodeVersion } = require('../src/utils/node-version-guard'); L12: const _nv = checkNodeVersion(process.version);

Medium

Dynamic Require

Package source references dynamic require/import behavior.

bin/amicus.jsView on unpkg · L10

src/utils/claude-register.jsView file

1Install-time code directly mutates a foreign AI-agent control surface: L8: * (src/cli-handlers-init.js) — e.g. after a failed postinstall, a L9: * plugin-channel / --ignore-scripts install, or to repair deleted ~/.claude L10: * state. ... L47: function skillsRoot() { L48: return path.join(os.homedir(), '.claude', 'skills'); L49: } ... L80: L81: if (!existing.mcpServers) { existing.mcpServers = {}; } L82: L83: const prev = existing.mcpServers[name]; L84: const nextConfig = (prev && isAmicusMcpConfig(prev)) ? { ...prev, ...config } : config; ... L86: Write operation from src/sidecar/electron-exe-rel.js: L127: function writePathTxt({ electronDir, platform, fs }) { L128: fs.writeFileSync(path.join(electronDir, 'path.txt'), platformExe(platform)); L129: } Foreign user/project scope from src/

Critical

Ai Agent Control Hijack

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

src/utils/claude-register.jsView on unpkg · L1

•Manifest-trigger-reachable source links an external AI-agent control path to a behavior-bearing write operation. erwrite' }, { file: 'manual-orchestration.md', mode: 'overwrite' }, { file: 'model-notes.md', mode: 'if-missing' }, ]; function skillsroot() { return path.join(os.homedir(), '.claude', 'skills'); } const mcp_config = { command: 'npx', args: ['-y', 'amicus@latest', 'mcp'] };

High

Trigger Reachable External Ai Agent Control Surface Mutation

Manifest-trigger-reachable source writes behavior-bearing configuration into a user or project AI-agent control surface.

src/utils/claude-register.jsView on unpkg

electron/setup-ui.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 36

High

Semantic Analysis Limited

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

electron/setup-ui.js#virtual:normalized:round1View on unpkg

src/sidecar/unzip.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.6 matchedPath = src/sidecar/unzip.js matchedIdentity = npm:YW1pY3Vz:4.9.6 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/sidecar/unzip.jsView on unpkg

src/mcp-server.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.6 matchedPath = src/mcp-server.js matchedIdentity = npm:YW1pY3Vz:4.9.6 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/mcp-server.jsView on unpkg

src/utils/engine-install-scan.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.6 matchedPath = src/utils/engine-install-scan.js matchedIdentity = npm:YW1pY3Vz:4.9.6 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/utils/engine-install-scan.jsView on unpkg

src/sidecar/interactive.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.6 matchedPath = src/sidecar/interactive.js matchedIdentity = npm:YW1pY3Vz:4.9.6 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/sidecar/interactive.jsView on unpkg

src/headless.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.6 matchedPath = src/headless.js matchedIdentity = npm:YW1pY3Vz:4.9.6 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/headless.jsView on unpkg

src/observe/on-complete.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.6 matchedPath = src/observe/on-complete.js matchedIdentity = npm:YW1pY3Vz:4.9.6 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/observe/on-complete.jsView on unpkg

src/opencode-client.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.6 matchedPath = src/opencode-client.js matchedIdentity = npm:YW1pY3Vz:4.9.6 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/opencode-client.jsView on unpkg

src/sidecar/electron-provision.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.6 matchedPath = src/sidecar/electron-provision.js matchedIdentity = npm:YW1pY3Vz:4.9.6 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/sidecar/electron-provision.jsView on unpkg

src/sidecar/electron-repair-cache.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.6 matchedPath = src/sidecar/electron-repair-cache.js matchedIdentity = npm:YW1pY3Vz:4.9.6 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/sidecar/electron-repair-cache.jsView on unpkg

src/sidecar/setup-window.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.6 matchedPath = src/sidecar/setup-window.js matchedIdentity = npm:YW1pY3Vz:4.9.6 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/sidecar/setup-window.jsView on unpkg

src/sidecar/workspace-window.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.6 matchedPath = src/sidecar/workspace-window.js matchedIdentity = npm:YW1pY3Vz:4.9.6 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/sidecar/workspace-window.jsView on unpkg

src/utils/updater.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.9.6 matchedPath = src/utils/updater.js matchedIdentity = npm:YW1pY3Vz:4.9.6 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/utils/updater.jsView on unpkg