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@kl-c/matrixos@0.1.26: AI-agent policy block | LPM Firewall

registry / @kl-c/matrixos / 0.1.26

@kl-c/matrixos@0.1.26

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

AI Security Review

scanned 10h ago · by lpm-firewall-ai

LPM blocks this version under the AI-agent control-surface policy. npm postinstall mutates the user's global OpenCode agent-command surface. It installs package-controlled commands that OpenCode will discover at startup and invalidates related caches.

Static reason

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

Trigger

npm installation of @kl-c/matrixos

Impact

Package-authored agent instructions become active in a broad user-level AI-agent control surface.

Mechanism

unconsented postinstall injection into user-level OpenCode commands

Policy narrative

On installation, postinstall.mjs copies bundled Markdown command instructions from the package into ~/.config/opencode/command, a user-level directory OpenCode loads at startup. The operation is automatic and overwrites same-named command files; it also removes matching OpenCode cache directories. This creates an unconsented broad AI-agent instruction surface before any explicit package CLI command.

Rationale

Direct inspection confirms an install-time write to the user's globally discovered OpenCode command directory. This meets the firewall policy for unconsented postinstall mutation of a foreign/broad AI-agent control surface.

Evidence

package.jsonpostinstall.mjs.opencode/command/adopt.md.agents/command/adopt.md.opencode/command/*.md.agents/command/*.md~/.config/opencode/command/*.md~/.cache/opencode

Decision evidence

Source & flagged code

20 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

16L17: const require = createRequire(import.meta.url); L18:

Medium

Dynamic Require

Package source references dynamic require/import behavior.

bin/oh-my-opencode.jsView on unpkg · L16

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

63398this.args = manager.shardArgs ?? []; L63399: this.execArgv = manager.execArgv; L63400: this.env = Object.assign({}, process3.env, {

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

•matchType = normalized_sha256 matchedPackage = @kl-c/matrixos@0.1.24 matchedPath = dist/cli/skills/superpowers-brainstorming/scripts/server.cjs matchedIdentity = npm:QGtsLWMvbWF0cml4b3M:0.1.24 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

1const crypto = require('crypto'); L2: const http = require('http'); L3: const fs = require('fs'); ... L12: function computeAcceptKey(clientKey) { L13: return crypto.createHash('sha1').update(clientKey + WS_MAGIC).digest('base64'); L14: } ... L84: L85: const PORT_FILE = process.env.BRAINSTORM_PORT_FILE || null; L86: const randomPort = () => 49152 + Math.floor(Math.random() * 16383); ... L195: try { sessionStorage.setItem('brainstorm-session-key', ${jsonKey}); } catch (e) {} L196: location.replace('/'); L197: </script>

Low

Weak Crypto

Package source references weak cryptographic algorithms.

dist/cli/skills/superpowers-brainstorming/scripts/server.cjsView on unpkg · L1

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

dist/cli-node/index.jsView file

•path = dist/cli-node/index.js kind = oversized_source_file sizeBytes = 4678082 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 = 4678082 magicHex = [redacted]

Medium

Oversized Cli Entrypoint

Package contains an oversized executable-looking CLI entrypoint.

dist/cli-node/index.jsView on unpkg

bin/matrixos.jsView file

•matchType = normalized_sha256 matchedPackage = @kl-c/matrixos@0.1.24 matchedPath = bin/matrixos.js matchedIdentity = npm:QGtsLWMvbWF0cml4b3M:0.1.24 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/skills/superpowers-brainstorming/scripts/server.cjsView file

•matchType = normalized_sha256 matchedPackage = @kl-c/matrixos@0.1.24 matchedPath = dist/cli/skills/superpowers-brainstorming/scripts/server.cjs matchedIdentity = npm:QGtsLWMvbWF0cml4b3M:0.1.24 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/skills/superpowers-brainstorming/scripts/server.cjsView on unpkg

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

•matchType = normalized_sha256 matchedPackage = @kl-c/matrixos@0.1.24 matchedPath = packages/lsp-daemon/dist/cli.js matchedIdentity = npm:QGtsLWMvbWF0cml4b3M:0.1.24 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@0.1.24 matchedPath = packages/lsp-daemon/dist/client.js matchedIdentity = npm:QGtsLWMvbWF0cml4b3M:0.1.24 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