# NexusWindows for Codex (npm · nexus-windows-codex)

Windows computer use in the background for Codex: UI Automation, Win32 messages, read back.

- Trust score: 63/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-23

## Components

- npm · `nexus-windows-codex`: 63/100 (this document), [markdown](https://verifymcp.io/servers/pironjulien-nexus-windows-codex/nexus-windows-codex.md), [page](https://verifymcp.io/servers/pironjulien-nexus-windows-codex/nexus-windows-codex)

## Channel facts

- Registry: `npm`
- Package: `nexus-windows-codex`
- Version: `3.0.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-23.

- **Supply Chain Security**: 50/100
  - Malware scan not yet available for this package.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **Provenance & Transparency**: 100/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to pironjulien/NexusWindows-Codex).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 0 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 66/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 557 tokens (~111/item across 5 items; 5 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 81/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 43% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

**Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

## Install

### How do I install the NexusWindows for Codex MCP server?

NexusWindows for Codex runs locally as an npm package, launched with npx -y nexus-windows-codex. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add pironjulien-nexus-windows-codex -- npx -y nexus-windows-codex
```

### Cursor

```json
{
  "mcpServers": {
    "pironjulien-nexus-windows-codex": {
      "command": "npx",
      "args": [
        "-y",
        "nexus-windows-codex"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "pironjulien-nexus-windows-codex": {
      "command": "npx",
      "args": [
        "-y",
        "nexus-windows-codex"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add pironjulien-nexus-windows-codex -- npx -y nexus-windows-codex
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "pironjulien-nexus-windows-codex": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "nexus-windows-codex"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add pironjulien-nexus-windows-codex --command npx --arg -y --arg nexus-windows-codex
```

### Hermes

```yaml
mcp_servers:
  pironjulien-nexus-windows-codex:
    command: "npx"
    args: ["-y", "nexus-windows-codex"]
```

### Netclaw

```json
{
  "McpServers": {
    "pironjulien-nexus-windows-codex": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "nexus-windows-codex"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add pironjulien-nexus-windows-codex -t stdio -c npx -a -y nexus-windows-codex
```

### Other

```json
{
  "mcpServers": {
    "pironjulien-nexus-windows-codex": {
      "command": "npx",
      "args": [
        "-y",
        "nexus-windows-codex"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-23 (score 63)

First indexed and scored.

## MCP tools (5)

### `windows` (~48 tokens)

List windows

Application windows on the desktop (id, app, title, pid), like the taskbar. Password managers are never listed. filter: part of a title or app.

Input parameters:

- `filter` (string)

### `look` (~124 tokens)

Look at a window

See a window in the background, without bringing it forward: UI Automation tree (roles, names, ids, values, states) and, with mode image or both, a native capture that works even when the window is covered. Selects that window for act; an observation serves one act and expires after 60 s.

Input parameters:

- `mode` (string): text (UI Automation tree, default), image (native capture), both
- `window` (integer|string): Window id from windows, or a unique part of its title or app; omitted: the window of the last look

### `act` (~103 tokens)

Act in the window

Steps on the window of the last look, in the background first (Win32 messages, UI Automation, DevTools for Chromium), the real mouse/keyboard only as a fallback under the shared foreground token. One step, or up to 32 each with its own expect; stops at the first step not verified. Per step: ✓ verified, = already done, ~ unknown (never replayed: look again), ✗ failed or refused.

Input parameters:

- `steps` (array, required)

### `launch` (~122 tokens)

Launch an app, folder or document

Open an application (name, absolute path or Store app id), a folder or a document (absolute path) or a Settings page (ms-settings:...) and give the foreground back to the user. Returns the windows attributed to this launch, each with its proof: "process" (the process the shell returned) or "application" (the requested application, started after the request: another instance started at the same moment could be taken for it); other new windows come back as candidates (outcome unknown). Look at one before acting.

Input parameters:

- `app` (string, required)

### `window` (~69 tokens)

Manage a window

close: close the window (one close message, read back; a "save?" prompt is reported, never answered).

Input parameters:

- `action` (string, required)
- `window` (integer|string): Window id from windows, or a unique part of its title or app; omitted: the window of the last look

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/pironjulien-nexus-windows-codex/nexus-windows-codex#diagnostics

## Score history

- 2026-10-23: 63

## Common questions

### What is the NexusWindows for Codex MCP server?

NexusWindows for Codex is an MCP server listed in the public MCP registry as io.github.pironjulien/nexus-windows-codex. Windows computer use in the background for Codex: UI Automation, Win32 messages, read back. This page covers its npm package (nexus-windows-codex).

### Is the NexusWindows for Codex MCP server safe to use?

NexusWindows for Codex scores 63 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 23 October 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the NexusWindows for Codex MCP server expose?

NexusWindows for Codex exposes 5 tools: windows, look, act, launch, window. Their descriptions and schemas cost roughly 466 tokens of context every time the server is loaded.

### Is the NexusWindows for Codex MCP server still maintained?

NexusWindows for Codex is still listed as active in the MCP registry. We last reached this channel on 23 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the NexusWindows for Codex MCP server under?

NexusWindows for Codex declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/nexus-windows-codex
- Socket report: https://socket.dev/npm/package/nexus-windows-codex
- Repository: https://github.com/pironjulien/NexusWindows-Codex
- Website: https://julienpiron.fr/nexuswindows/codex/
- Changelog RSS feed: https://verifymcp.io/servers/pironjulien-nexus-windows-codex/nexus-windows-codex.xml
- Changelog JSON feed: https://verifymcp.io/servers/pironjulien-nexus-windows-codex/nexus-windows-codex.json
- HTML version of this page: https://verifymcp.io/servers/pironjulien-nexus-windows-codex/nexus-windows-codex