# io.github.marcimastro98/xenon-widgets (npm · xenon-mcp)

Build widgets for the Xenon dashboard: SDK reference, install, runtime errors, tile screenshots.

- Trust score: 67/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- npm · `xenon-mcp`: 67/100 (this document), [markdown](https://verifymcp.io/servers/marcimastro98-xenon-widgets/xenon-mcp.md), [page](https://verifymcp.io/servers/marcimastro98-xenon-widgets/xenon-mcp)

## Channel facts

- Registry: `npm`
- Package: `xenon-mcp`
- Version: `1.0.0`
- 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 2026-11-05.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - 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**: 32/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Licence could not be checked: the licence is shipped as a file inside the package, not declared as a standard (SPDX) licence identifier, so we cannot tell whether it is OSI-approved.
  - Actively maintained (last published 5 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 72/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 904 tokens (~100/item across 9 items; 9 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**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% 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 9 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 10 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 io.github.marcimastro98/xenon-widgets MCP server?

io.github.marcimastro98/xenon-widgets runs locally as an npm package, launched with npx -y xenon-mcp. 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 marcimastro98-xenon-widgets -- npx -y xenon-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "marcimastro98-xenon-widgets": {
      "command": "npx",
      "args": [
        "-y",
        "xenon-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "marcimastro98-xenon-widgets": {
      "command": "npx",
      "args": [
        "-y",
        "xenon-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add marcimastro98-xenon-widgets -- npx -y xenon-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "marcimastro98-xenon-widgets": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "xenon-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add marcimastro98-xenon-widgets --command npx --arg -y --arg xenon-mcp
```

### Hermes

```yaml
mcp_servers:
  marcimastro98-xenon-widgets:
    command: "npx"
    args: ["-y", "xenon-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "marcimastro98-xenon-widgets": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "xenon-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add marcimastro98-xenon-widgets -t stdio -c npx -a -y xenon-mcp
```

### Other

```json
{
  "mcpServers": {
    "marcimastro98-xenon-widgets": {
      "command": "npx",
      "args": [
        "-y",
        "xenon-mcp"
      ]
    }
  }
}
```

## 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.

### 2026-10-31 (score 67, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-10-30 (score 52)

First indexed and scored.

## MCP tools (9)

### `xenon_status` (~47 tokens)

Check that Xenon is running on this computer and ready for widgets: its version, the Widget SDK version, whether community widgets are on and whether a dashboard is open. Call it first.

### `sdk_reference` (~68 tokens)

Read the Xenon Widget SDK reference: the manifest, the message protocol, data streams, actions, storage, sizing and the sandbox rules. With no section you get the table of contents. Read it before writing a widget.

Input parameters:

- `section` (string): A section name from the table of contents.

### `new_widget` (~151 tokens)

Write a working starter widget (manifest, HTML, CSS, JS showing live CPU and memory) into a new or empty folder. Edit it from there, then install_widget.

Input parameters:

- `folder` (string, required): Absolute path of the widget folder (the one holding manifest.json). Its name is the widget id unless `id` is given.
- `id` (string): Widget id: 2 to 41 characters, a-z, 0-9 and dashes.
- `name` (string): The name people see. Defaults to the id.
- `overwrite` (boolean): Replace files with the same names in a folder that is not empty.
- `size` (string): Tile size. Defaults to medium.

### `check_widget` (~104 tokens)

Run the checks Xenon runs before installing, without installing: the package rules, what the sandbox will refuse (inline scripts, remote code, hosts) and the Store's review notes.

Input parameters:

- `folder` (string, required): Absolute path of the widget folder (the one holding manifest.json). Its name is the widget id unless `id` is given.
- `id` (string): Widget id: 2 to 41 characters, a-z, 0-9 and dashes.

### `install_widget` (~122 tokens)

Install or update the widget from its folder put it on the dashboard and show its page (a new page when the one in view is full). Permissions it asks for still wait for the person to approve them on the dashboard. Then call widget_issues and widget_screenshot.

Input parameters:

- `folder` (string, required): Absolute path of the widget folder (the one holding manifest.json). Its name is the widget id unless `id` is given.
- `id` (string): Widget id: 2 to 41 characters, a-z, 0-9 and dashes.

### `widget_issues` (~101 tokens)

What went wrong in an installed widget while it ran: errors and console.error lines, requests the sandbox blocked, whether its permissions are approved, and how heavy it is. Errors thrown in widget code show as "Script error." because of the sandbox: wrap code in try/catch and console.error the message to see it.

Input parameters:

- `id` (string, required): Widget id: 2 to 41 characters, a-z, 0-9 and dashes.

### `widget_screenshot` (~67 tokens)

A picture of the widget's tile as it is on screen now. Anything on top of the dashboard shows too. Not available on Linux under Wayland.

Input parameters:

- `id` (string, required): Widget id: 2 to 41 characters, a-z, 0-9 and dashes.

### `my_widgets` (~107 tokens)

List the widgets the person made (not Store downloads). With an id and a folder, write that widget's files into the folder to keep working on it.

Input parameters:

- `folder` (string): With id: a new or empty folder to write the widget into.
- `id` (string): Widget id: 2 to 41 characters, a-z, 0-9 and dashes.
- `overwrite` (boolean): Replace files with the same names in a folder that is not empty.

### `share_widget` (~78 tokens)

A share code for one of the person's own widgets, which anyone can paste into Xenon, plus the Store review notes. To put it in the Store the person sends it from xenon-app.com/submit.

Input parameters:

- `id` (string, required): Widget id: 2 to 41 characters, a-z, 0-9 and dashes.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/marcimastro98-xenon-widgets/xenon-mcp#diagnostics

## Score history

- 2026-11-05: 67
- 2026-11-04: 67
- 2026-11-03: 67
- 2026-11-02: 67
- 2026-11-01: 67
- 2026-10-31: 67
- 2026-10-30: 52

## Common questions

### What is the io.github.marcimastro98/xenon-widgets MCP server?

io.github.marcimastro98/xenon-widgets is an MCP server listed in the public MCP registry as io.github.marcimastro98/xenon-widgets. Build widgets for the Xenon dashboard: SDK reference, install, runtime errors, tile screenshots. This page covers its npm package (xenon-mcp).

### Is the io.github.marcimastro98/xenon-widgets MCP server safe to use?

io.github.marcimastro98/xenon-widgets scores 67 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. 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 io.github.marcimastro98/xenon-widgets MCP server expose?

io.github.marcimastro98/xenon-widgets exposes 9 tools: xenon_status, sdk_reference, new_widget, check_widget, install_widget, and 4 more. Their descriptions and schemas cost roughly 845 tokens of context every time the server is loaded.

### Is the io.github.marcimastro98/xenon-widgets MCP server still maintained?

io.github.marcimastro98/xenon-widgets is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- npm package: https://www.npmjs.com/package/xenon-mcp
- Socket report: https://socket.dev/npm/package/xenon-mcp
- Repository: https://github.com/marcimastro98/Xenon
- Changelog RSS feed: https://verifymcp.io/servers/marcimastro98-xenon-widgets/xenon-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/marcimastro98-xenon-widgets/xenon-mcp.json
- HTML version of this page: https://verifymcp.io/servers/marcimastro98-xenon-widgets/xenon-mcp