# view-sim (npm · view-sim-mcp)

See a site on phones, tablets and laptops in Safari, Chrome, Firefox or Zen frames; PNG screenshots.

- Trust score: 72/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- npm · `view-sim-mcp`: 72/100 (this document), [markdown](https://verifymcp.io/servers/itelo-view-sim/view-sim-mcp.md), [page](https://verifymcp.io/servers/itelo-view-sim/view-sim-mcp)

## Channel facts

- Registry: `npm`
- Package: `view-sim-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**: 98/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 30 of 95 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 48/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 6 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 71/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 946 tokens (~105/item across 9 items; 9 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 92/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 77% 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 9 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.

## Install

### How do I install the view-sim MCP server?

view-sim runs locally as an npm package, launched with npx -y view-sim-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 itelo-view-sim -- npx -y view-sim-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "itelo-view-sim": {
      "command": "npx",
      "args": [
        "-y",
        "view-sim-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "itelo-view-sim": {
      "command": "npx",
      "args": [
        "-y",
        "view-sim-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add itelo-view-sim -- npx -y view-sim-mcp
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add itelo-view-sim --command npx --arg -y --arg view-sim-mcp
```

### Hermes

```yaml
mcp_servers:
  itelo-view-sim:
    command: "npx"
    args: ["-y", "view-sim-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "itelo-view-sim": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "view-sim-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add itelo-view-sim -t stdio -c npx -a -y view-sim-mcp
```

### Other

```json
{
  "mcpServers": {
    "itelo-view-sim": {
      "command": "npx",
      "args": [
        "-y",
        "view-sim-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.

### 2026-11-03 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 0 to 3. That category is still filling its 30-day observation window: 0 days of observed history at the previous scan, 1 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 69)

First indexed and scored.

## MCP tools (9)

### `view_sim_status` (~29 tokens)

Simulator status

Whether the extension is connected, and every open simulator tab with its devices, URLs and viewport sizes.

### `view_sim_list_devices` (~37 tokens)

List devices

Every device the simulator can show (phones, tablets, Macs, displays) with screen size, pixel ratio and the browsers it supports.

### `view_sim_open` (~151 tokens)

Open a URL in the simulator

Opens a URL in a new browser tab with the simulator on for its site, optionally choosing the devices. Waits until every device has loaded. The site must have been allowed once from the extension's toolbar button in Firefox/Zen.

Input parameters:

- `devices` (array): Devices to show, left to right. Omit to keep the site's saved devices.
- `frame` (boolean): Draw device bezels, status bars and browser UI
- `sync` (boolean): Navigate every device when one of them navigates
- `tab_id` (integer): Reuse this tab instead of opening a new one
- `url` (string, required)
- `zoom` (string): How large devices are drawn on screen

### `view_sim_set_devices` (~53 tokens)

Set devices

Replaces the devices shown in a simulator tab and reloads them.

Input parameters:

- `devices` (array, required)
- `tab_id` (integer): Browser tab id from view_sim_status. Defaults to the focused simulator tab.

### `view_sim_navigate` (~79 tokens)

Navigate

Loads a URL (absolute, or a path like /pricing) in the simulator's devices and waits for them to load. A URL on another site leaves the simulator unless that site is on too.

Input parameters:

- `tab_id` (integer): Browser tab id from view_sim_status. Defaults to the focused simulator tab.
- `url` (string, required)

### `view_sim_set_options` (~91 tokens)

Set display options

Changes zoom, frames and navigation sync for a simulator tab.

Input parameters:

- `frame` (boolean): Draw device bezels, status bars and browser UI
- `sync` (boolean): Navigate every device when one of them navigates
- `tab_id` (integer): Browser tab id from view_sim_status. Defaults to the focused simulator tab.
- `zoom` (string): How large devices are drawn on screen

### `view_sim_screenshot` (~194 tokens)

Screenshot devices

Screenshots one device, or every device in the extension's simulator tab (uses your real browser session, so signed-in pages work). mode 'device' includes the bezel and stand, 'screen' is the whole display with status bar and browser UI, 'viewport' is only the web page; 'device' and 'screen' have a transparent background. The tab is brought to the front while capturing. For screenshots without a browser window, use view_sim_headless_screenshot.

Input parameters:

- `device`: Card index (0 = leftmost) or device id. Omit to capture every device.
- `max_width` (integer): Images wider than this are scaled down
- `mode` (string)
- `save_dir` (string): Also write the PNGs to this directory and return their paths
- `tab_id` (integer): Browser tab id from view_sim_status. Defaults to the focused simulator tab.

### `view_sim_headless_screenshot` (~267 tokens)

Headless screenshot

Screenshots a URL on simulated devices without any browser window or the extension, using Playwright with real device emulation (viewport, pixel ratio, touch, mobile mode, user agent). Safari devices render in WebKit, the others in Chromium. 'device' and 'screen' images have a transparent background. Pages behind a login need storage_state.

Input parameters:

- `devices` (array)
- `engine` (string)
- `frame` (boolean): viewport mode only: false uses the whole screen as the page instead of leaving room for status and browser bars
- `full_page` (boolean): viewport mode only: capture the full scrollable page
- `max_width` (integer): Images are rendered at most this wide (and at most at the device's pixel ratio)
- `mode` (string): device: with bezel and stand; screen: display with status and browser bars; viewport: the web page only
- `save_dir` (string): Also write the PNGs to this directory and return their paths
- `storage_state` (string): Path to a Playwright storage-state JSON (cookies and localStorage) for signed-in pages
- `url` (string, required)
- `wait_ms` (integer): Extra time after load, for animations and late content

### `view_sim_turn_off` (~45 tokens)

Turn the simulator off for a site

Turns the simulator off for a hostname; its tabs show the normal page after a reload.

Input parameters:

- `host` (string, required): Hostname, e.g. localhost or example.com

## Diagnostics

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

## Score history

- 2026-11-05: 72
- 2026-11-04: 72
- 2026-11-03: 72
- 2026-11-02: 71
- 2026-11-01: 71
- 2026-10-31: 70
- 2026-10-30: 70
- 2026-10-29: 69

## Common questions

### What is the view-sim MCP server?

view-sim is an MCP server listed in the public MCP registry as io.github.itelo/view-sim. See a site on phones, tablets and laptops in Safari, Chrome, Firefox or Zen frames; PNG screenshots. This page covers its npm package (view-sim-mcp).

### Is the view-sim MCP server safe to use?

view-sim scores 72 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 view-sim MCP server expose?

view-sim exposes 9 tools: view_sim_status, view_sim_list_devices, view_sim_open, view_sim_set_devices, view_sim_navigate, and 4 more. Their descriptions and schemas cost roughly 946 tokens of context every time the server is loaded.

### Is the view-sim MCP server still maintained?

view-sim 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.

### What licence is the view-sim MCP server under?

view-sim 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/view-sim-mcp
- Socket report: https://socket.dev/npm/package/view-sim-mcp
- Repository: https://github.com/itelo/view-sim
- Changelog RSS feed: https://verifymcp.io/servers/itelo-view-sim/view-sim-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/itelo-view-sim/view-sim-mcp.json
- HTML version of this page: https://verifymcp.io/servers/itelo-view-sim/view-sim-mcp