registry / @h-rig/harness-plugin / 0.0.6-alpha.238

@h-rig/harness-plugin@0.0.6-alpha.238

First-party agent-harness provider capability plugin for Rig.

AI Security Review

scanned 2h ago · by lpm-firewall-ai

LPM treats this as warn-only first-party agent extension lifecycle risk. The package provides first-party agent-harness capabilities that can materialize project Claude Code hooks and Pi extension settings. These actions are not triggered at npm install.

Static reason

High-risk behavior combination matched malicious policy.

Trigger

Host Rig runtime invokes hook materialization, or a user runs `rig pi add` / agent commands.

Impact

Configured hooks or Pi packages can affect later agent sessions; no unconsented install-time mutation or concrete exfiltration chain is established.

Mechanism

Project-scoped AI-agent configuration writes plus explicit runtime process execution.

Rationale

This is a high-impact first-party agent extension/runtime package, not proven malware. Its project-scoped hook materialization and opaque native executables warrant a warning under the extension lifecycle policy.

Evidence

package.jsondist/src/session-hook-materializer-service.jsdist/src/pi-command.jsdist/src/agent-harness/agent-wrapper.jsdist/src/tooling/shell-tools.js.claude/settings.json.pi/settings.json.rig/state/pi-managed-packages.jsonnative/*/rig-shellnative/*/rig-tools

Network endpoints2

registry.npmjs.org/-/v1/search?text=<query>&size=20${RIG_SERVER_URL}/api/runs/${runId}/steering?ack=1

Decision evidence

public snapshot

AI called this Suspicious at 84.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

`dist/src/session-hook-materializer-service.js` writes command hooks to project `.claude/settings.json`.
`dist/src/pi-command.js` can add packages to project `.pi/settings.json` only through explicit `rig pi add`.
`dist/src/agent-harness/agent-wrapper.js` polls an operator-configured `RIG_SERVER_URL` with optional bearer auth.
Package ships executable `native/*/rig-shell` and `rig-tools` artifacts.

Evidence against

`package.json` has no preinstall, install, postinstall, or other lifecycle scripts.
Hook materializer preserves non-plugin hooks and replaces only entries marked `_rigPlugin`.
No hard-coded remote endpoint or source-level credential exfiltration was found.
Process execution is exposed through explicit agent/runtime commands and controlled shell tooling.

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetwork

Supply chain

HighEntropyStringsUrlStrings

Manifest

NoLicense

scanned 34 file(s), 640 KB of source, external domains: registry.npmjs.org

Source & flagged code

3 flagged

dist/src/agent-harness/rig-agent.jsView file

Lines 1-35javascript

1#!/usr/bin/env bun

2// @bun

4// packages/harness-plugin/src/agent-harness/rig-agent.ts

5import { existsSync as existsSync3, mkdirSync as mkdirSync2, readFileSync as readFileSync2, writeFileSync as writeFileSync2 } from "fs";

6import { dirname, resolve as resolve3 } from "path";

7import { readBuildConfig } from "@rig/core/build-time-config";

9// packages/harness-plugin/src/agent-harness/controlled-bash.ts

10import { existsSync } from "fs";

11import { resolve } from "path";

12import { resolveRigLayout } from "@rig/core/layout";

13function controlledBashCandidates(projectRoot) {

14 const layout = resolveRigLayout(projectRoot);

15 const candidates = [

16 process.env.RIG_CONTROLLED_BASH_BIN?.trim() || "",

17 resolve(layout.binDir, "controlled-bash"),

18 Bun.which("controlled-bash") || ""

19 ];

20 return candidates.filter((candidate) => Boolean(candidate));

21}

22function resolveControlledBash(projectRoot) {

23 for (const candidate of controlledBashCandidates(projectRoot)) {

24 if (existsSync(candidate))

25 return candidate;

26 }

27 return null;

28}

29async function runControlledBash(args, options) {

30 const projectRoot = process.env.RIG_HOST_PROJECT_ROOT?.trim() || process.env.PROJECT_RIG_ROOT?.trim() || process.env.RIG_TASK_WORKSPACE?.trim() || process.cwd() || options.projectRootFallbackDir;

31 const controlled = resolveControlledBash(projectRoot);

Critical

Persistence Backdoor

Source writes persistence or remote-access backdoor material.

dist/src/agent-harness/rig-agent.jsView on unpkg · L15

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

dist/src/agent-harness/rig-agent.jsView on unpkg · L15

32 if (!controlled) {

33 console.error("[rig-agent] controlled-bash entrypoint unavailable; refusing to run an unguarded shell.");

34 return 126;

35 }

native/linux-arm64/rig-shellView file

•path = native/linux-arm64/rig-shell kind = native_binary sizeBytes = 3038760 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

native/linux-arm64/rig-shellView on unpkg

Source & flagged code

3 flagged · loading source

dist/src/agent-harness/rig-agent.jsView file

15const candidates = [ L16: process.env.RIG_CONTROLLED_BASH_BIN?.trim() || "", L17: resolve(layout.binDir, "controlled-bash"), ... L29: async function runControlledBash(args, options) { L30: const projectRoot = process.env.RIG_HOST_PROJECT_ROOT?.trim() || process.env.PROJECT_RIG_ROOT?.trim() || process.env.RIG_TASK_WORKSPACE?.trim() || process.cwd() || options.projectR... L31: const controlled = resolveControlledBash(projectRoot); ... L38: stdin: "inherit", L39: stdout: "inherit", L40: stderr: "inherit", ... L170: try { L171: const parsed = JSON.parse(readFileSync(path, "utf-8")); L172: return parsed && typeof parsed === "object" && !Array.isArray(parsed) ? parsed : null;

Critical

Persistence Backdoor

Source writes persistence or remote-access backdoor material.

dist/src/agent-harness/rig-agent.jsView on unpkg · L15

15Trigger-reachable chain: manifest.exports -> dist/src/agent-harness/rig-agent.js L15: const candidates = [ L16: process.env.RIG_CONTROLLED_BASH_BIN?.trim() || "", L17: resolve(layout.binDir, "controlled-bash"), ... L29: async function runControlledBash(args, options) { L30: const projectRoot = process.env.RIG_HOST_PROJECT_ROOT?.trim() || process.env.PROJECT_RIG_ROOT?.trim() || process.env.RIG_TASK_WORKSPACE?.trim() || process.cwd() || options.projectR... L31: const controlled = resolveControlledBash(projectRoot); ... L38: stdin: "inherit", L39: stdout: "inherit", L40: stderr: "inherit", ... L170: try { L171: const parsed = JSON.parse(readFileSync(path, "utf-8")); L172: return parsed && typeof parsed === "object" && !Array.isArray(parsed) ? parsed : null;

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

dist/src/agent-harness/rig-agent.jsView on unpkg · L15

native/linux-arm64/rig-shellView file

•path = native/linux-arm64/rig-shell kind = native_binary sizeBytes = 3038760 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

native/linux-arm64/rig-shellView on unpkg

Findings

2 Critical4 Medium4 Low

CriticalPersistence Backdoordist/src/agent-harness/rig-agent.js

CriticalTrigger Reachable Dangerous Capabilitydist/src/agent-harness/rig-agent.js

MediumNetwork

MediumEnvironment Vars

MediumShips Native Binarynative/linux-arm64/rig-shell

MediumStructural Risk Force Deep Review

LowFilesystem

LowHigh Entropy Strings

LowUrl Strings

LowNo License

Source & flagged code

3 flagged

dist/src/agent-harness/rig-agent.jsView file

Lines 1-35javascript

1#!/usr/bin/env bun

2// @bun

4// packages/harness-plugin/src/agent-harness/rig-agent.ts

5import { existsSync as existsSync3, mkdirSync as mkdirSync2, readFileSync as readFileSync2, writeFileSync as writeFileSync2 } from "fs";

6import { dirname, resolve as resolve3 } from "path";

7import { readBuildConfig } from "@rig/core/build-time-config";

9// packages/harness-plugin/src/agent-harness/controlled-bash.ts

10import { existsSync } from "fs";

11import { resolve } from "path";

12import { resolveRigLayout } from "@rig/core/layout";

13function controlledBashCandidates(projectRoot) {

14 const layout = resolveRigLayout(projectRoot);

15 const candidates = [

16 process.env.RIG_CONTROLLED_BASH_BIN?.trim() || "",

17 resolve(layout.binDir, "controlled-bash"),

18 Bun.which("controlled-bash") || ""

19 ];

20 return candidates.filter((candidate) => Boolean(candidate));

21}

22function resolveControlledBash(projectRoot) {

23 for (const candidate of controlledBashCandidates(projectRoot)) {

24 if (existsSync(candidate))

25 return candidate;

26 }

27 return null;

28}

29async function runControlledBash(args, options) {

30 const projectRoot = process.env.RIG_HOST_PROJECT_ROOT?.trim() || process.env.PROJECT_RIG_ROOT?.trim() || process.env.RIG_TASK_WORKSPACE?.trim() || process.cwd() || options.projectRootFallbackDir;

31 const controlled = resolveControlledBash(projectRoot);

Critical

Persistence Backdoor

Source writes persistence or remote-access backdoor material.

dist/src/agent-harness/rig-agent.jsView on unpkg · L15

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

dist/src/agent-harness/rig-agent.jsView on unpkg · L15

32 if (!controlled) {

33 console.error("[rig-agent] controlled-bash entrypoint unavailable; refusing to run an unguarded shell.");

34 return 126;

35 }

native/linux-arm64/rig-shellView file

•path = native/linux-arm64/rig-shell kind = native_binary sizeBytes = 3038760 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

native/linux-arm64/rig-shellView on unpkg