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

registry / amicus / 4.7.1

amicus@4.7.1

Multi-model LLM Council + parallel AI window for Claude Code. Run structured council reviews across Gemini, GPT, DeepSeek and more — or fork a conversation to any model and fold the results back.

AI Security Review

scanned 7d ago · by lpm-firewall-ai

LPM flags this version as an AI-agent control-surface risk. npm postinstall unconditionally modifies Claude Code and Claude Desktop/Cowork user control surfaces. It also installs skills and registers a mutable npx@latest MCP command.

Static reason

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

Trigger

npm installation with lifecycle scripts enabled

Impact

Future Claude sessions can load and execute the package MCP server outside the install context.

Mechanism

postinstall writes global AI-agent configs and skills

Policy narrative

Installing the package runs postinstall, which copies skills into the user's Claude directory and registers an MCP server in Claude Code and Claude Desktop/Cowork configuration. The registered command is npx -y amicus@latest mcp, causing later agent launches to resolve the latest remote package rather than the installed version. This is an unconsented install-time mutation of broad AI-agent control surfaces.

Rationale

Source confirms the critical behavior rather than merely scanner hints: an automatic npm postinstall modifies global Claude configuration and injects a mutable MCP launch command. This meets the firewall block boundary for foreign/broad AI-agent control-surface mutation.

Evidence

package.jsonscripts/postinstall.jssrc/utils/claude-register.jssrc/utils/legacy-mcp-migration.jsscripts/setup-hooks.js~/.claude/skills/sidecar/SKILL.md~/.claude/skills/second-opinion/~/.claude.json

Source & flagged code

9 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-install.js: L125: function writePathTxt({ electronDir, platform, fs }) { L126: fs.writeFileSync(path.join(electronDir, 'path.txt'), platformExe(platform)); L127: } ... L131: const distDir = path.join(

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

src/sidecar/unzip.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.6.2 matchedPath = src/sidecar/unzip.js matchedIdentity = npm:YW1pY3Vz:4.6.2 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/sidecar/electron-install.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.6.2 matchedPath = src/sidecar/electron-install.js matchedIdentity = npm:YW1pY3Vz:4.6.2 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-install.jsView on unpkg

src/sidecar/interactive.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.6.2 matchedPath = src/sidecar/interactive.js matchedIdentity = npm:YW1pY3Vz:4.6.2 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/observe/on-complete.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.6.2 matchedPath = src/observe/on-complete.js matchedIdentity = npm:YW1pY3Vz:4.6.2 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@4.6.2 matchedPath = src/opencode-client.js matchedIdentity = npm:YW1pY3Vz:4.6.2 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

Source & flagged code

9 flagged

package.jsonView file

Lines 39-79json

39 "src/",

40 "schemas/",

41 "electron/",

42 "skills/",

43 "commands/",

44 ".claude-plugin/",

45 "CHANGELOG.md",

46 "docs/*.md",

47 "scripts/postinstall.js",

48 "scripts/setup-hooks.js"

49 ],

50 "scripts": {

51 "start": "node --experimental-top-level-await --experimental-vm-modules bin/amicus.js",

52 "test": "jest",

53 "test:integration": "node scripts/run-integration-keyless.js",

54 "test:integration:live": "jest --runInBand --testPathIgnorePatterns='worktrees' --testMatch='**/tests/**/*.integration.test.js'",

55 "test:all": "jest --testPathIgnorePatterns='/node_modules/' --testPathIgnorePatterns='worktrees' && node scripts/mark-test-passed.js",

56 "test:e2e:mcp": "jest tests/mcp-repomix-e2e.integration.test.js --testTimeout=180000 --forceExit",

57 "posttest": "node scripts/mark-test-passed.js",

58 "lint": "eslint src/ electron/ tests/helpers/",

59 "postinstall": "node scripts/postinstall.js",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L59

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L59

60 "test:thinking": "node scripts/benchmark-thinking.js",

61 "test:thinking:quick": "MODELS=gemini node scripts/benchmark-thinking.js",

62 "refresh-models": "node bin/amicus.js models --refresh",

63 "models:info": "node bin/amicus.js models",

64 "models:check": "node bin/amicus.js models --check",

65 "models:check:strict": "node bin/amicus.js models --check --strict",

66 "generate-icon": "node scripts/generate-icon.js",

67 "generate-docs": "node scripts/generate-docs.js",

68 "generate-docs:check": "node scripts/generate-docs.js --check",

69 "validate-docs": "node scripts/validate-docs.js --full",

70 "setup-hooks": "node scripts/setup-hooks.js",

71 "graphify:index": "graphify extract . --backend claude-cli",

72 "check:secrets": "node scripts/check-secrets.js --all",

73 "check:sizes": "node scripts/check-file-sizes.js --all",

74 "check:tarball": "node scripts/check-tarball-lifecycle.js"

75 },

76 "dependencies": {

77 "@electron/get": "^5.0.0",

78 "@modelcontextprotocol/sdk": "^1.27.0",

79 "@opencode-ai/sdk": "1.18.15",

bin/amicus.jsView file

Lines 1-30javascript

1#!/usr/bin/env node

2

3/**

4 * Amicus CLI Entry Point

5 *

6 * Spec Reference: §4 CLI Interface

7 * Routes commands to appropriate handlers.

8 */

9

10// Node version guard: fail fast on unsupported Node versions

11const { checkNodeVersion } =

src/utils/claude-register.jsView file

Lines 1-21javascript

1/**

2 * @module claude-register

3 * Registration core for amicus: skill install (chat skill + LLM Council),

4 * MCP server registration in Claude Code / Claude Desktop, and legacy MCP

5 * migration. Extracted from scripts/postinstall.js (Task 15, v4.2 §4.8/C2) so

6 * the SAME core can run at `npm install` time (via postinstall.js, now a

7 * thin re-exporting consumer of this module) AND on demand via `amicus init`

8 * (src/cli-handlers-init.js) — e.g. after a failed postinstall, a

9 * plugin-channel / --ignore-scripts install, or to repair deleted ~/.claude

src/sidecar/unzip.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.6.2 matchedPath = src/sidecar/unzip.js matchedIdentity = npm:YW1pY3Vz:4.6.2 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/sidecar/electron-install.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.6.2 matchedPath = src/sidecar/electron-install.js matchedIdentity = npm:YW1pY3Vz:4.6.2 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-install.jsView on unpkg

src/sidecar/interactive.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.6.2 matchedPath = src/sidecar/interactive.js matchedIdentity = npm:YW1pY3Vz:4.6.2 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/observe/on-complete.jsView file

•matchType = normalized_sha256 matchedPackage = amicus@4.6.2 matchedPath = src/observe/on-complete.js matchedIdentity = npm:YW1pY3Vz:4.6.2 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@4.6.2 matchedPath = src/opencode-client.js matchedIdentity = npm:YW1pY3Vz:4.6.2 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