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u-foo@3.1.0: AI-agent control-surface risk | LPM Firewall

registry / u-foo / 3.1.0

u-foo@3.1.0

Multi-Agent Workspace Protocol. Just add u. claude → uclaude, codex → ucodex.

AI Security Review

scanned 4h ago · by lpm-firewall-ai

LPM flags this version as an AI-agent control-surface risk. The postinstall hook changes Claude and Codex user skill directories without a user command. It replaces existing targets and makes package instruction files available to those agents.

Static reason

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

Trigger

npm postinstall

Impact

Future Claude or Codex sessions can load package-controlled instructions that register and receive package bus messages.

Mechanism

Automatic replacement and linking of AI-agent skill directories

Policy narrative

Installing the package runs a postinstall hook that deletes existing targets and links its bundled skills into Claude and Codex user skill directories. Those skills direct external agents to register with the package MCP service and establish message delivery. This is an unconsented install-time mutation of broad, foreign AI-agent control surfaces.

Rationale

Direct source inspection confirms unconsented postinstall mutation of both Claude and Codex global skill directories, including replacement of existing targets. The installed instructions establish an agent-control channel, satisfying the block policy.

Evidence

scripts/postinstall.jsscripts/postinstall-skills.jsSKILLS/ufoo-bus/SKILL.mdSKILLS/ufoo/SKILL.mdSKILLS/ufoo-context/SKILL.mdSKILLS/ufoo-online/SKILL.md~/.claude/skills${CODEX_HOME:-~/.codex}/skills

Source & flagged code

15 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/ufoo.jsView file

94L95: const { execSync } = require("child_process"); L96: const path = require("path");

High

Child Process

Package source references child process execution.

bin/ufoo.jsView on unpkg · L94

bin/ukimi.jsView file

13L14: const AgentLauncher = require("../src/agents/launch/launcher"); L15: const { resolveDefaultManualBootstrap } = require("../[redacted]");

Medium

Dynamic Require

Package source references dynamic require/import behavior.

bin/ukimi.jsView on unpkg · L13

src/runtime/projects/projectId.jsView file

1const crypto = require("crypto"); L2: const fs = require("fs");

Low

Weak Crypto

Package source references weak cryptographic algorithms.

src/runtime/projects/projectId.jsView on unpkg · L1

src/coordination/bus/inject.jsView file

1const { spawn, spawnSync } = require("child_process"); L2: const fs = require("fs"); L3: const net = require("net"); L4: const path = require("path"); ... L7: L8: const SHOULD_LOG_INJECT = process.env.UFOO_INJECT_DEBUG === "1"; L9: const logInject = (message) => {

High

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution; review context before blocking.

src/coordination/bus/inject.jsView on unpkg · L1

src/agents/providers/claudeThreadProvider.jsView file

31package = u-foo; repositoryIdentity = ufoo; dependency = @anthropic-ai/claude-agent-sdk L31: try { L32: return await import("@anthropic-ai/claude-agent-sdk"); L33: } catch (err) {

High

Copied Package Dependency Bridge

Package metadata claims a different repository identity while copied source loads a runtime dependency bridge.

src/agents/providers/claudeThreadProvider.jsView on unpkg · L31

scripts/postinstall.jsView file

74function installSkillDirs(targetDir, sources, label) { L75: fs.mkdirSync(targetDir, { recursive: true }); L76: ... L84: // Install ufoo skills for Claude and Codex at npm install time. L85: // - Claude skills: ~/.claude/skills/<name> -> skill dir L86: // - Codex skills: ${CODEX_HOME:-~/.codex}/skills/<name> -> skill dir L87: try { ... L90: const sources = collectSkillSources(pkgRoot); L91: const codexHome = process.env.CODEX_HOME || path.join(home, ".codex"); L92: const retiredLinks = [redacted]({ pkgRoot, home, codexHome }); ... L98: if (sources.length > 0) { L99: installSkillDirs(path.join(home, ".claude", "skills"), sources, "~/.claude/skills");

Critical

Ai Agent Control Hijack

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

scripts/postinstall.jsView on unpkg · L74

•Manifest-trigger-reachable source links an external AI-agent control path to a behavior-bearing write operation. es", "node-pty", "prebuilds", platform, "spawn-helper" ); if (fs.existssync(spawnhelperpath)) { const stats = fs.statsync(spawnhelperpath); if ((stats.mode & 0o111) === 0) { fs.chmodsync(spawnhelperpath, 0o755); console.log(`[postinstall] fixed node-pty spawn-helper permissions (${platform})`); } } } catch { } } try { const plat = `${process.platform}-${process.arch}`; const tuibin = path.join(__dirname, "..", "dist", "tui", plat, "ufoo-tui"); if (

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.

scripts/postinstall.jsView on unpkg

dist/tui/linux-arm64/ufoo-tuiView file

•path = dist/tui/linux-arm64/ufoo-tui kind = native_binary sizeBytes = 2131600 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

dist/tui/linux-arm64/ufoo-tuiView on unpkg

src/agents/launch/launcher.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.31 matchedPath = src/agents/launch/launcher.js matchedIdentity = npm:dS1mb28:3.0.31 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/agents/launch/launcher.jsView on unpkg

src/runtime/daemon/mcpServer.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.31 matchedPath = src/runtime/daemon/mcpServer.js matchedIdentity = npm:dS1mb28:3.0.31 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/runtime/daemon/mcpServer.jsView on unpkg

src/runtime/daemon/ops.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.31 matchedPath = src/runtime/daemon/ops.js matchedIdentity = npm:dS1mb28:3.0.31 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/runtime/daemon/ops.jsView on unpkg

src/ui/rustChatHost.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.31 matchedPath = src/ui/rustChatHost.js matchedIdentity = npm:dS1mb28:3.0.31 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/ui/rustChatHost.jsView on unpkg

src/agents/launch/ptyWrapper.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.31 matchedPath = src/agents/launch/ptyWrapper.js matchedIdentity = npm:dS1mb28:3.0.31 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/agents/launch/ptyWrapper.jsView on unpkg

Source & flagged code

15 flagged

package.jsonView file

Lines 31-71json

31 "ukimi": "bin/ukimi.js",

32 "ucode": "bin/ucode.js"

33 },

34 "files": [

35 "bin/",

36 "src/",

37 "templates/",

38 "online/",

39 "scripts/",

40 "dist/tui/",

41 "SKILLS/",

42 "OPTIONAL_SKILLS/",

43 "LICENSE",

44 "README.md"

45 ],

46 "type": "commonjs",

47 "engines": {

48 "node": ">=18"

49 },

50 "scripts": {

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

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L51

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L51

52 "pack:tui": "node scripts/pack-tui.js",

53 "prepack": "node scripts/pack-tui.js --check",

54 "test": "jest",

55 "test:watch": "jest --watch",

56 "test:coverage": "jest --coverage"

57 },

58 "dependencies": {

59 "@anthropic-ai/claude-agent-sdk": "^0.2.138",

60 "@modelcontextprotocol/sdk": "^1.30.0",

61 "@openai/codex-sdk": "^0.145.0",

62 "@xterm/addon-serialize": "^0.14.0",

63 "@xterm/headless": "^6.0.0",

64 "chalk": "^4.1.2",

65 "commander": "^13.1.0",

66 "gray-matter": "^4.0.3",

67 "node-pty": "^1.1.0",

68 "ws": "^8.19.0"

69 },

70 "devDependencies": {

71 "jest": "^30.2.0"

bin/ufoo.jsView file

Lines 74-114javascript

74 }

75 if (cmd === "chat") {

76 await runChat(chatProjectRoot, { globalMode });

77 return;

78 }

79

80 // Handle resume command to resume/launch agent sessions

bin/ukimi.jsView file

Lines 1-33javascript

1#!/usr/bin/env node

2/**

3 * ukimi: Launch Kimi Code CLI (kimi) and auto-join event bus

4 *

5 * Usage: ukimi [kimi args...]

6 *

7 * Differences vs uclaude:

8 * - kimi has no --append-system-prompt style flag, so the default

9 * bootstrap is delivered via post-launch PTY injection (same model as

10 * ucodex's UFOO_STARTUP_BOOTSTRAP_TEXT path).

11 * - Session resume uses kimi's own session ids via `--session <id>`.

src/runtime/projects/projectId.jsView file

Lines 1-21javascript

1const crypto = require("crypto");

2const fs = require("fs");

Low

Weak Crypto

Package source references weak cryptographic algorithms.

src/runtime/projects/projectId.jsView on unpkg · L1

3const

src/coordination/bus/inject.jsView file

Lines 1-21javascript

1const { spawn, spawnSync } = require("child_process");

2const fs = require("fs");

3const net

src/agents/providers/claudeThreadProvider.jsView file

Lines 11-51javascript

11const CACHE_CONTROL = Object.freeze({ type: "ephemeral" });

12

13function createThreadId() {

14 return `claude-thread-${Date.now().toString

scripts/postinstall.jsView file

Lines 54-94javascript

54 sources.push({ name: entry.name, dir: path.join(topSkills, entry.name) });

55 }

56 }

57 }

58 }

59 return sources;

60}

61

62function forceSymlink

dist/tui/linux-arm64/ufoo-tuiView file

•path = dist/tui/linux-arm64/ufoo-tui kind = native_binary sizeBytes = 2131600 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

dist/tui/linux-arm64/ufoo-tuiView on unpkg

src/agents/launch/launcher.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.31 matchedPath = src/agents/launch/launcher.js matchedIdentity = npm:dS1mb28:3.0.31 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/agents/launch/launcher.jsView on unpkg

src/runtime/daemon/mcpServer.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.31 matchedPath = src/runtime/daemon/mcpServer.js matchedIdentity = npm:dS1mb28:3.0.31 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/runtime/daemon/mcpServer.jsView on unpkg

src/runtime/daemon/ops.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.31 matchedPath = src/runtime/daemon/ops.js matchedIdentity = npm:dS1mb28:3.0.31 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/runtime/daemon/ops.jsView on unpkg

src/ui/rustChatHost.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.31 matchedPath = src/ui/rustChatHost.js matchedIdentity = npm:dS1mb28:3.0.31 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/ui/rustChatHost.jsView on unpkg

src/agents/launch/ptyWrapper.jsView file

•matchType = normalized_sha256 matchedPackage = u-foo@3.0.31 matchedPath = src/agents/launch/ptyWrapper.js matchedIdentity = npm:dS1mb28:3.0.31 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/agents/launch/ptyWrapper.jsView on unpkg