registry / AI-agent control-surface risk / @kl-c/matrixos

@kl-c/matrixos

MaTrixOS — Agentic OS for OpenCode. Personalizable, communicating, self-improving, resilient.

This report shows the evidence for @kl-c/matrixos@0.3.65. 14 of 21 known versions are blocked or flagged. The newest version, 0.3.81, is flagged. See all versions.

AI Security Review

scanned 3mo ago · by lpm-firewall-ai

The lifecycle hook establishes persistent, package-controlled global agent commands without an explicit user command. This meets the install-time AI-agent control-hijack blocking boundary.

Static reason

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

Trigger

npm installation executes the postinstall lifecycle hook.

Impact

Subsequent OpenCode sessions can load package-authored instructions under generic command names, including commands directing repository and release actions.

Mechanism

global OpenCode command injection via postinstall

Policy narrative

On install, postinstall.mjs copies bundled Markdown commands into the global OpenCode command directory with overwrite enabled, then clears OpenCode caches. The injected commands are interpreted as agent instructions; for example, publish.md directs Git/GitHub release actions and remove-deadcode.md directs parallel code-removal workflows. This is unconsented install-time mutation of a broad AI-agent control surface.

AI rationale

The lifecycle hook establishes persistent, package-controlled global agent commands without an explicit user command. This meets the install-time AI-agent control-hijack blocking boundary.

Evidence

package.jsonpostinstall.mjs.agents/command/publish.md.agents/command/remove-deadcode.md.opencode/command/*.md.agents/command/*.md~/.config/opencode/command/*.md~/.cache/opencode~/.cache/opencode/packages

Decision evidence

public snapshot

AI identified this as a dangerous AI-agent capability at 96.0% confidence with low false-positive risk.

Evidence for policy risk

package.json runs postinstall.mjs on npm install.
postinstall.mjs copies bundled .md files into ~/.config/opencode/command automatically.
Copies overwrite same-named user-level commands with force:true.
postinstall.mjs clears OpenCode package caches.
.agents/command/publish.md directs an agent to run git/GitHub publishing workflows.

Evidence against

postinstall.mjs contains no network or credential-exfiltration logic.
CLI child-process use is user-invoked runtime behavior.

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetworkShellWebSocket

Supply chain

HighEntropyStringsTelemetryUrlStrings

Manifest

NoLicense

scanned 211 file(s), 3.12 MB of source, external domains: 127.0.0.1, api.github.com, biomejs.dev, bun.sh, clangd.llvm.org, clojure-lsp.io, deno.land, github.com, gleam.run, primeradiant.com, registry.npmjs.org, sentry.io, us.i.posthog.com

Source & flagged code

21 flagged

package.jsonView file

Lines 79-119json

79 },

80 "./server": "./dist/index.js",

81 "./tui": "./dist/tui.js",

82 "./features": "./dist/features/matrix-inventory/features.js",

83 "./schema.json": "./dist/matrixos.schema.json"

84 },

85 "scripts": {

86 "build": "bun run script/build.ts",

87 "build:cli-node": "bun run script/build-cli-node.ts",

88 "build:dashboard-frontend": "rm -rf dist/features/dashboard/frontend && mkdir -p dist/features/dashboard/frontend && cp -R packages/omo-opencode/src/features/dashboard/frontend/. dist/features/dashboard/frontend/",

89 "build:shared-skills-assets": "rm -rf dist/skills && cp -R packages/shared-skills/skills dist/skills && mkdir -p dist/cli && rm -rf dist/cli/skills && cp -R packages/shared-skills/skills dist/cli/skills",

90 "build:lsp-tools-mcp": "npm --prefix packages/lsp-tools-mcp ci && npm --prefix packages/lsp-tools-mcp run build",

91 "build:lsp-daemon": "npm --prefix packages/lsp-daemon ci && npm --prefix packages/lsp-daemon run build",

92 "build:node-require-shim": "bun run script/patch-node-require-shim.ts",

93 "build:binaries": "bun run script/build-binaries.ts",

94 "build:features-inventory": "bun build packages/omo-opencode/src/features/matrix-inventory/features.ts --outdir dist/features/matrix-inventory --target bun --format esm --external zod",

95 "build:schema": "bun run script/build-schema.ts",

96 "build:model-capabilities": "bun run script/build-model-capabilities.ts",

97 "clean": "rm -rf dist",

98 "prepare": "bun run build",

99 "postinstall": "node postinstall.mjs",

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg · L99

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg · L99

100 "prepublishOnly": "bun run clean && bun run build:lsp-tools-mcp && bun run build:lsp-daemon && bun run build",

101 "test:model-capabilities": "bun test packages/model-core/src/model-capability-aliases.test.ts packages/model-core/src/model-capability-guardrails.test.ts packages/model-core/src/model-capabilities.test.ts packages/omo-opencode/src/cli/doctor/checks/model-resolution.test.ts --bail",

102 "typecheck": "tsgo --noEmit && bun run typecheck:script && bun run typecheck:packages",

103 "typecheck:packages": "tsgo --noEmit -p packages/rules-engine/tsconfig.json && tsgo --noEmit -p packages/delegate-core/tsconfig.json && tsgo --noEmit -p packages/mcp-stdio-core/tsconfig.json && tsgo --noEmit -p packages/mcp-client-core/tsconfig.json && tsgo --noEmit -p packages/git-bash-mcp/tsconfig.json && tsgo --noEmit -p packages/lsp-core/tsconfig.json && tsgo --noEmit -p packages/utils/tsconfig.json && tsgo --noEmit -p packages/model-core/tsconfig.json && tsgo --noEmit -p packages/omo-config-core/tsconfig.json && tsgo --noEmit -p packages/prompts-core/tsconfig.json && tsgo --noEmit -p ...

104 "typecheck:script": "tsgo --noEmit -p script/tsconfig.json",

105 "test": "bun test",

106 "build:git-bash-mcp": "bun run --cwd packages/git-bash-mcp build",

107 "build:slash-commands": "rm -rf dist/cli/slash-commands && mkdir -p dist/cli/slash-commands && cp packages/omo-opencode/src/cli/slash-commands/*.md dist/cli/slash-commands/"

108 },

109 "keywords": [

110 "opencode",

111 "plugin",

112 "agentic-os",

113 "agents",

114 "ai",

115 "llm",

116 "matrixos"

117 ],

118 "author": "KL-Consulting",

119 "license": "SEE LICENSE IN LICENSE.md",

Long lines were clipped for display.

bin/oh-my-opencode.jsView file

Lines 1-36javascript

1#!/usr/bin/env node

2// bin/oh-my-opencode.js

3// Wrapper script that detects platform and spawns the correct binary

5import { spawnSync } from "node:child_process";

6import { existsSync, readFileSync } from "node:fs";

High

Child Process

Package source references child process execution.

bin/oh-my-opencode.jsView on unpkg · L4

dist/tui.jsView file

681for (;index < max; index++) { L682: if (!isHexCode(data.charCodeAt(index))) L683: return false; ... L4234: const osProvider = options.osProvider ?? os; L4235: const env = options.env ?? process.env; L4236: const preferredDir = env.XDG_DATA_HOME ?? path.join(osProvider.homedir(), ".local", "share"); L4237: return resolveWritableDirectory(preferredDir, `${appName}-data`, osProvider); ... L4518: // [redacted].ts L4519: import { execFile } from "child_process"; L4520: import { promisify } from "util"; ... L6322: error: new (_Err ?? $ZodError)(result.issues.map((iss) => finalizeIssue(iss, ctx, config()))) L6323: } : { success: true, data: result.value };

Critical

Command Output Exfiltration

Source executes local commands and sends command output to an external endpoint.

dist/tui.jsView on unpkg · L681

681Trigger-reachable chain: manifest.exports -> dist/tui.js L681: for (;index < max; index++) { L682: if (!isHexCode(data.charCodeAt(index))) L683: return false; ... L4234: const osProvider = options.osProvider ?? os; L4235: const env = options.env ?? process.env; L4236: const preferredDir = env.XDG_DATA_HOME ?? path.join(osProvider.homedir(), ".local", "share"); L4237: return resolveWritableDirectory(preferredDir, `${appName}-data`, osProvider); ... L4518: // [redacted].ts L4519: import { execFile } from "child_process"; L4520: import { promisify } from "util"; ... L6322: error: new (_Err ?? $ZodError)(result.issues.map((iss) => finalizeIssue(iss, ctx, config()))) L6323: } : { success: true, data: result.value };

Critical

Trigger Reachable Dangerous Capability

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

dist/tui.jsView on unpkg · L681

63414this.args = manager.shardArgs ?? []; L63415: this.execArgv = manager.execArgv; L63416: this.env = Object.assign({}, process3.env, {

dist/skills/superpowers-brainstorming/scripts/server.cjsView file

Lines 1-21javascript

1const crypto = require('crypto');

2const http = require('http');

3const fs =

dist/cli-node/index.jsView file

•context = *: Use \`getAISnapshot()\` to discover elements and \`selectSnapshotRef()\` to interact with them\n- **Visual feedback**: Take screenshots to see what the user sees\n\n## Setup\n\n**IMPORTANT**: Before using this skill, ensure the server is running. See [references/installation.md](references/installation.md) for platform-specific setup instructions (macOS, Linux, Windows).\n\nTwo modes available. Ask the user if unclear which to use.\n\n### Standalone Mode (Default)\n\nLaunches a new Chromium browser for fresh automation sessions.\n\n**macOS/Linux:**\n\`\`\`bash\n./skills/dev-browser/server.sh &\n\`\`\`\n\n**Windows (PowerShell):**\n\`\`\`powershell\nStart-Process -NoNewWindow -FilePath "node" -ArgumentList "skills/dev-browser/server.js"\n\`\`\`\n\nAdd \`--headless\` flag if use

Critical

Encrypted Payload Temp Execution

Source decrypts an embedded payload, writes it to disk, and executes it through a child process.

dist/cli-node/index.jsView on unpkg

•path = dist/cli-node/index.js kind = oversized_source_file sizeBytes = 6627422 magicHex = [redacted]

Medium

Oversized Source File

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

dist/cli-node/index.jsView on unpkg

•path = dist/cli-node/index.js kind = oversized_cli_entrypoint sizeBytes = 6627422 magicHex = [redacted]

Medium

Oversized Cli Entrypoint

Package contains an oversized executable-looking CLI entrypoint.

dist/cli-node/index.js

postinstall.mjsView file

1Install-time AI-agent control hijack evidence: L3: L4: import { readdirSync, rmSync, cpSync, mkdirSync, existsSync } from "node:fs"; L5: import { createRequire } from "node:module"; ... L19: * so OpenCode discovers them at startup. OpenCode scans L20: * `~/.config/opencode/command/*.md` (user-level) and `.opencode/command/*.md` L21: * (project-level), but NOT package internals under node_modules. Without this ... L28: const commandSources = [ L29: join(__dirname, ".opencode", "command"), L30: join(__dirname, ".agents", "command"), ... L35: if (!existsSync(sourceDir)) continue; L36: mkdirSync(targetDir, { recursive: true }); L37: for (const entry of readdirSync(sourceDir, { withFileTypes: true })) { Payload evidence from dist/features/builtin-skills/skills/playwright-mcp-skill.d.ts: L1: ex

Critical

Ai Agent Control Hijack

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

postinstall.mjsView on unpkg · L1

dist/cli/skills/ast-grep/install.shView file

•path = dist/cli/skills/ast-grep/install.sh kind = build_helper sizeBytes = 7581 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

dist/cli/skills/ast-grep/install.shView on unpkg

dist/cli/skills/ast-grep/tests/smoke.ps1View file

•path = dist/cli/skills/ast-grep/tests/smoke.ps1 kind = payload_in_excluded_dir sizeBytes = 5701 magicHex = [redacted]

High

Payload In Excluded Dir

Package hides binary, compressed, or executable-looking payloads in test/fixture/hidden paths.

dist/cli/skills/ast-grep/tests/smoke.ps1View on unpkg

bin/matrixos.jsView file

•matchType = normalized_sha256 matchedPackage = @kl-c/matrixos@0.3.53 matchedPath = bin/matrixos.js matchedIdentity = npm:QGtsLWMvbWF0cml4b3M:0.3.53 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.

bin/matrixos.jsView on unpkg

dist/cli/skills/superpowers-brainstorming/scripts/server.cjsView file

•matchType = normalized_sha256 matchedPackage = @kl-c/matrixos@0.3.53 matchedPath = dist/cli/skills/superpowers-brainstorming/scripts/server.cjs matchedIdentity = npm:QGtsLWMvbWF0cml4b3M:0.3.53 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.

dist/cli/skills/superpowers-brainstorming/scripts/server.cjsView on unpkg

packages/lsp-daemon/dist/cli.jsView file

•matchType = normalized_sha256 matchedPackage = @kl-c/matrixos@0.3.53 matchedPath = packages/lsp-daemon/dist/cli.js matchedIdentity = npm:QGtsLWMvbWF0cml4b3M:0.3.53 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.

packages/lsp-daemon/dist/cli.jsView on unpkg

packages/lsp-daemon/dist/client.jsView file

•matchType = normalized_sha256 matchedPackage = @kl-c/matrixos@0.3.53 matchedPath = packages/lsp-daemon/dist/client.js matchedIdentity = npm:QGtsLWMvbWF0cml4b3M:0.3.53 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.

packages/lsp-daemon/dist/client.jsView on unpkg

Source & flagged code

21 flagged · loading source

package.jsonView file

•scripts.postinstall = node postinstall.mjs

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node postinstall.mjs

Medium

Ambiguous Install Lifecycle Script

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

package.jsonView on unpkg

bin/oh-my-opencode.jsView file

4L5: import { spawnSync } from "node:child_process"; L6: import { existsSync, readFileSync } from "node:fs";

High

Child Process

Package source references child process execution.

bin/oh-my-opencode.jsView on unpkg · L4

Findings

4 Critical11 High8 Medium8 Low

CriticalCommand Output Exfiltrationdist/tui.js

CriticalEncrypted Payload Temp Executiondist/cli-node/index.js

CriticalAi Agent Control Hijackpostinstall.mjs

CriticalTrigger Reachable Dangerous Capabilitydist/tui.js

HighInstall Time Lifecycle Scriptspackage.json

HighChild Processbin/oh-my-opencode.js

HighShelldist/tui.js

HighObfuscated Payload Loaderdist/tui.js

HighRemote Agent Bridgedist/tui.js

HighPayload In Excluded Dirdist/cli/skills/ast-grep/tests/smoke.ps1

HighKnown Malware Source Similaritybin/matrixos.js

HighKnown Malware Source Similarity

Affected versions and remediation

This report applies to @kl-c/matrixos@0.3.65.

The versions list below shows the verdict for each recorded version.

Avoid installing @kl-c/matrixos@0.3.65. Remove it from direct dependencies and check your lockfile for transitive copies.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.
If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.

Evidence last updated: 2026-07-26 10:52:43.756Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

Versions

21 known versions

0.3.81latestSuspiciousAgent extension lifecycle riskWarnPublishedAug 1, 2026, 8:39 PM 0.3.80SuspiciousAgent extension lifecycle riskWarnPublishedJul 29, 2026, 12:45 PM 0.3.65shownMaliciousSoft block: AI-agent control surfaceBlockPublishedJul 26, 2026, 10:48 AM 0.3.53MaliciousSoft block: AI-agent control surfaceBlockPublished

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other AI-agent control-surface risk packages

Runtime surface

Behavioral surface

Related packages

Other AI-agent control-surface risk packages

Source & flagged code