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pi-worker@0.4.0: AI-agent control-surface risk | LPM Firewall

registry / pi-worker / 0.4.0

pi-worker@0.4.0

Run exact Pi models as bounded workers for coding agents.

AI Security Review

scanned 2h ago · by lpm-firewall-ai

LPM flags this version as an AI-agent control-surface risk. npm postinstall automatically installs the package's bundled AI-agent skill into global, rule-derived agent locations. This mutates a broad foreign agent control surface without a user command or consent.

Static reason

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

Trigger

npm installation, via postinstall

Impact

A package-controlled skill becomes available to installed coding-agent platforms and can direct their future behavior.

Mechanism

global skills CLI installation into detected and universal agent skill directories

Policy narrative

On npm installation, the postinstall script calls installSkill. The installer enumerates global targets from a 76-agent ruleset plus $HOME/.agents/skills, then runs the bundled skills CLI with --global --yes to install pi-worker into those agent control surfaces. Although it refuses to overwrite unrecognized content, the initial installation is unconsented and affects broad third-party agent configuration locations.

Rationale

Source confirms an unconsented postinstall write path into global, multi-vendor AI-agent skill directories. Safeguards against overwriting conflicts do not remove that control-surface mutation.

Evidence

package.jsonnpm/scripts/postinstall.mjsnpm/lib/skill-install.mjsnpm/lib/skill-rules.mjsnpm/generated/skills-rules.jsonskills/pi-worker/SKILL.md$HOME/.agents/skills/pi-worker

Source & flagged code

8 flagged · loading source

package.jsonView file

•scripts.postinstall = node npm/scripts/postinstall.mjs

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

44"scripts": { "postinstall": "node npm/scripts/postinstall.mjs",

High

Suspicious Lifecycle Evidence

package.json runs a postinstall script.

package.jsonView on unpkg · L44

•scripts.postinstall = node npm/scripts/postinstall.mjs

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

npm/lib/skill-install.mjsView file

61Install-time code directly mutates a foreign AI-agent control surface: L225: const resolved = resolveTargets(rules, runtime) ?? []; L226: return targetsFromResolved([...resolved, path.join(home, ".agents", "skills")], cwd, platform); L227: } ... L229: function requiredTargetList({ rules, agentIds, runtime, cwd, platform }) { L230: const agentsById = new Map(rules.agents.map((agent) => [agent.id, agent])); L231: const resolved = agentIds.map((id) => { ... L584: L585: const canonical = path.join(home, ".agents", "skills", SKILL_NAME); L586: const states = []; ... L685: }); L686: const agentsById = new Map(rules.agents.map((agent) => [agent.id, agent])); L687: const detectedGlobalAgentIds = detected.filter((id) => agentsById.get(id)?.rule.kind !== "no-global-target"); Write operation from np

Critical

Ai Agent Control Hijack

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

npm/lib/skill-install.mjsView on unpkg · L61

•matchType = normalized_sha256 matchedPackage = pi-worker@0.2.0 matchedPath = npm/lib/sk[redacted] matchedIdentity = npm:cGktd29ya2Vy:0.2.0 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.

npm/lib/skill-install.mjsView on unpkg

•matchType = malicious_source_fingerprint_signature signature = ff5a4b1139e01a9f signatureType = suspicious_hashes sourceLabel = final_verdict:malicious matchedPackage = pi-worker@0.2.0 matchedPath = npm/lib/sk[redacted] matchedIdentity = npm:cGktd29ya2Vy:0.2.0 similarity = 1.000 shingleOverlap = 8 summary = package final verdict is malicious

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

npm/lib/skill-install.mjsView on unpkg

npm/native/linux-arm64/pi-workerView file

•path = npm/native/linux-arm64/pi-worker kind = native_binary sizeBytes = 3342498 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

npm/native/linux-arm64/pi-workerView on unpkg

npm/scripts/postinstall.mjsView file

49let outcome = "failed"; let targetCount; try { const result = await install(); outcome = result?.outcome ?? "failed"; targetCount = result?.targetCount;

High

Suspicious Lifecycle Evidence

Postinstall calls installSkill without an opt-in prompt.

npm/scripts/postinstall.mjsView on unpkg · L49

Source & flagged code

8 flagged

package.jsonView file

Lines 24-57json

24 },

25 "bin": {

26 "pi-worker": "npm/bin/pi-worker.mjs"

27 },

28 "files": [

29 "npm/bin/",

30 "npm/generated/",

31 "npm/lib/",

32 "npm/native/",

33 "npm/scripts/postinstall.mjs",

34 "skills/pi-worker/",

35 "README.md",

36 "CONTRIBUTING.md",

37 "SECURITY.md",

38 "LICENSE",

39 "THIRD_PARTY_NOTICES"

40 ],

41 "dependencies": {

42 "skills": "1.5.22"

43 },

44 "scripts": {

45 "postinstall": "node npm/scripts/postinstall.mjs",

High

Suspicious Lifecycle Evidence

package.json runs a postinstall script.

package.jsonView on unpkg · L44

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L45

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L45

46 "stage": "node npm/scripts/stage-package.mjs",

47 "test": "node --test npm/test/*.test.mjs",

48 "check:rules": "node npm/scripts/extract-skills-rules.mjs --check npm/generated/skills-rules.json",

49 "check:notices": "go run ./tools/notices --check THIRD_PARTY_NOTICES",

50 "check:hygiene": "node npm/scripts/check-hygiene.mjs",

51 "notices:check": "npm run check:notices",

52 "skills-rules:check": "npm run check:rules",

53 "verify": "npm test && npm run check:rules && npm run check:notices && npm run check:hygiene",

54 "prepack": "npm run check:notices && npm run check:rules && npm run check:hygiene"

55 }

56}

57

npm/lib/skill-install.mjsView file

Lines 41-81javascript

41const MAX_RECEIPT_BYTES = 1024 * 1024;

42const CHILD_GRACE_MS = 100;

43

44const packageRootFromUrl =

npm/native/linux-arm64/pi-workerView file

•path = npm/native/linux-arm64/pi-worker kind = native_binary sizeBytes = 3342498 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

npm/native/linux-arm64/pi-workerView on unpkg

npm/scripts/postinstall.mjsView file

Lines 29-67javascript

29 const normalized = ["installed", "blocked", "skipped"].includes(outcome)

30 ? outcome

31 : "failed";

32