registry / AI-agent control-surface risk / open-walnut / 0.6.6

open-walnut@0.6.6

Personal AI powered by Claude — task management, Claude Code sessions, memory system, and web UI

AI Security Review

scanned 9d ago · by lpm-firewall-ai

The postinstall silently alters a foreign AI agent’s control prompt by removing its file-read reminder. This is a concrete install-time AI agent control hijack.

Static reason

One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review

Trigger

The package’s automatic postinstall hook during installation.

Impact

Claude Agent SDK file-read results no longer include the reminder, weakening an agent control prompt.

Mechanism

The hook resolves the installed SDK, checks for the expected patch context, then replaces the SDK CLI source using a bundled diff.

Policy narrative

The automatic postinstall locates the installed Claude Agent SDK and patches its CLI. The shipped diff removes the conditional reminder included with file-read results. The patch is applied when the expected SDK version and source text match; the inspected code has no installer consent guard.

AI rationale

The postinstall silently alters a foreign AI agent’s control prompt by removing its file-read reminder. This is a concrete install-time AI agent control hijack.

Evidence

package.jsonscripts/postinstall.mjspatches/@anthropic-ai+claude-agent-sdk+0.2.50.patchnode_modules/@anthropic-ai/claude-agent-sdk/cli.js

Decision evidence

public snapshot

AI identified this as a dangerous AI-agent capability at 98.0% confidence with low false-positive risk.

Evidence for policy risk

The package runs its postinstall script during installation; that script resolves the installed Claude Agent SDK and writes a replacement to its cli.js.
The shipped diff removes a conditional system reminder from the SDK’s file-read results by replacing it with an empty string. The postinstall applies the diff without an affirmative consent check.
The flagged runtime excerpts show local config and cache path setup, a CLI config read, or discovery of local AGENTS.md and skills files; they do not show agent settings being changed.

Evidence against

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsEvalFilesystemNativeBindingsNetworkShellWebSocket

Supply chain

HighEntropyStringsMinifiedPossibleObfuscationUrlStrings

Source & flagged code

26 flagged

package.jsonView file

Lines 44-84json

44 "esbuild": true,

45 "onnxruntime-node": true,

46 "protobufjs": true,

47 "screencapturekit-audio-capture": true,

48 "sharp": true

49 },

50 "files": [

51 "bin",

52 "dist",

53 "!dist/daemon-binaries/daemon-linux-*",

54 "!dist/daemon-binaries/daemon-darwin-*",

55 "dist/daemon-binaries/dtach-*",

56 "!dist/**/*.map",

57 "!dist/**/*.gz",

58 "patches",

59 "scripts/postinstall.mjs",

60 "README.md",

61 "LICENSE"

62 ],

63 "scripts": {

64 "postinstall": "node scripts/postinstall.mjs",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L64

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L64

65 "prepublishOnly": "WALNUT_REQUIRE_BUN=1 npm run build && cd web && npx vite build && cd .. && node scripts/check-publish.mjs",

66 "prestart": "node scripts/check-node.mjs && node scripts/check-native-toolchain.mjs",

67 "start": "npm run web:build && node dist/cli.js web --port 3456",

68 "build:plugins": "npm run build -w @open-walnut/plugin-api && npm run build -w @open-walnut/plugin-cli",

69 "build": "npm run build:plugins && bash scripts/build-daemon.sh && tsup && rm -rf dist/data && cp -r src/data dist/ && for d in src/integrations/*/manifest.json; do t=\"dist/integrations/$(basename $(dirname $d))\"; mkdir -p \"$t\"; cp \"$d\" \"$t/\"; i=\"$(dirname $d)/icon.svg\"; rm -f \"$t/icon.svg\"; if [ -f \"$i\" ]; then cp \"

70 "docs:check": "node scripts/generate-ops-docs.mjs --check --repo-only && node scripts/check-plugin-doc-snippets.mjs",

71 "test:plugin-packages": "npm run build:plugins && vitest run --config vitest.focus.config.ts tests/core/plugin-package-metadata.test.ts tests/core/plugin-cli-dev.test.ts tests/core/plugin-cli-scaffold.test.ts tests/core/plugin-publish-check.test.ts && node scripts/check-plugin-packages.mjs",

72 "dev": "tsup --watch",

73 "release": "node scripts/release.mjs",

74 "test": "node scripts/test-parallel.mjs",

75 "test:quick": "npm run docs:check && vitest run --config vitest.quick.config.ts",

76 "search:eval": "tsx scripts/search-eval.mjs",

77 "search:robustness": "tsx scripts/search-robustness-eval.mjs",

78 "test:slow": "vitest run --config vitest.slow.config.ts",

79 "test:focus": "vitest run --config vitest.focus.config.ts",

80 "test:frontend:ci": "node scripts/test-frontend.mjs",

81 "test:changed": "node scripts/test-changed.mjs",

82 "test:baseline": "node scripts/test-baseline.mjs check",

83 "test:baseline:record": "node scripts/test-baseline.mjs record",

84 "test:pre-commit": "npm run docs:check && node scripts/test-changed.mjs --tiers",

dist/plugin-store/walnut-rhythm/dist/server.mjsView file

Lines 1-28javascript

1import{createRequire as __cr}from"node:module";const require=__cr(import.meta.url);

3// plugin-store/walnut-rhythm/src/server.ts

4import fsp3 from "node:fs/promises"

dist/workers/git-compaction-worker.jsView file

Lines 1236-1276javascript

1236

1237// src/utils/json-conflict-recovery.ts

1238import fsp2 from "fs/promises";

1239import path4 from "path";

1240import os2 from "os";

1241import

dist/web/static/assets/jszip.min-0xzyHQZu.jsView file

Lines 1-13javascript

1import{D as bt,F as It}from"./index-DtNzEUu6.js";function vt(yt){throw new Error('Could not dynamically require "'+yt+'". Please configure the dynamicRequireTargets or/and ignoreDynamicRequires option of @rollup/plugin-commonjs appropriately for this require call to work.'

bin/open-walnut.jsView file

Lines 43-68javascript

43 || (!sub && (args.includes('--version') || args.includes('-V'))));

44// The import is the whole program, so its failure must be LOUD. Unhandled, a

45// bundle that is momentarily empty (dist rewritten by a concurrent build) made

46// the CLI exit 0 having printed nothing at all — a caller in a loop reads that as

47// "the command answered, with nothing", which is the worst possible answer.

dist/daemon-binaries/daemon-service-cli.cjsView file

Lines 1-21javascript

1var Pn=Object.create;var{getPrototypeOf:Cn,defineProperty:Le,getOwnPropertyNames:Ht,getOwnPropertyDescriptor:Tn}=Object,mt=Object.prototype.hasOwnProperty;function zt(e){

dist/daemon-binaries/dtach-linux-x64View file

•path = dist/daemon-binaries/dtach-linux-x64 kind = native_binary sizeBytes = 731144 magicHex = [redacted]

Medium

Ships Native Binary

Package ships native binary artifacts.

dist/daemon-binaries/dtach-linux-x64View on unpkg

dist/data/skills/walnut-register-repo/scripts/validate-repo.pyView file

•path = dist/data/skills/walnut-register-repo/scripts/validate-repo.py kind = build_helper sizeBytes = 5994 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

dist/data/skills/walnut-register-repo/scripts/validate-repo.pyView on unpkg

dist/web/server.jsView file

•path = dist/web/server.js kind = oversized_source_file sizeBytes = 11315698 magicHex = [redacted]

Medium

Oversized Source File

Package contains source files above the normal full-analysis size ceiling.

dist/web/server.jsView on unpkg

dist/cli.jsView file

•path = dist/cli.js kind = oversized_cli_entrypoint sizeBytes = 11507370 magicHex = [redacted]

Medium

Oversized Cli Entrypoint

Package contains an oversized executable-looking CLI entrypoint.

dist/cli.jsView on unpkg

dist/cli-fast.jsView file

•stage = ast_semantic_analysis; reason = ast_alias_growth_limit_exceeded; limitedFiles = 7

High

Semantic Analysis Limited

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

dist/cli-fast.jsView on unpkg

•matchType = normalized_sha256 matchedPackage = open-walnut@0.6.10 matchedPath = dist/cli-fast.js matchedIdentity = npm:b3Blbi13YWxudXQ:0.6.10 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High