view-sim
NPM · VIEW-SIM-MCP
See a site on phones, tablets and laptops in Safari, Chrome, Firefox or Zen frames; PNG screenshots.
Available components
Last scanned (2 hours ago)
Scores higher than 42% of npm servers
Category Browser Automation
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. How we score → Why this is hard to score →
Supply Chain Security98
- No malware found by supply-chain analysis.Pass
- No known CVEs affecting this package version or its production dependencies.Pass
- No install/post-install scripts declared.Pass
- 30 of 95 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency48
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Provenance check failed: no build-provenance attestation is published. See how to fix → View diagnostics → Fail
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 6 days ago).Pass
- Publishes a security disclosure policy (SECURITY.md).Pass
Schema Quality & AI Usability71
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 946 tokens (~105/item across 9 items; 9 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management23
- Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage92
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 77% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 9 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 3 Nov 26 +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.
- 1 Nov 26 +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.
- 30 Oct 26 +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.
- 29 Oct 26 69
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Analysed npm/view-sim-mcp@1.0.0
Provenance No attestation
The registry publishes no build provenance for this version, so there is nothing to verify.
| Result | No attestation |
|---|---|
| Ecosystem | npm |
Background: How many MCP packages publish verified provenance →
Dependencies 95 packages
| Packages resolved | 95 |
|---|---|
| Stale | 30 |
| Tree resolution | Complete |
Background: SBOMs and build attestations, explained →
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
view_sim_headless_screenshot Headless screenshot ~267
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | – |
| wait_ms | integer | – | Extra time after load, for animations and late content |
No output schema declared.
No examples provided.
view_sim_list_devices List devices ~37
Every device the simulator can show (phones, tablets, Macs, displays) with screen size, pixel ratio and the browsers it supports.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
view_sim_navigate Navigate ~79
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.
| Name | Type | Req | Description |
|---|---|---|---|
| tab_id | integer | – | Browser tab id from view_sim_status. Defaults to the focused simulator tab. |
| url | string | yes | – |
No output schema declared.
No examples provided.
view_sim_open Open a URL in the simulator ~151
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | – |
| zoom | string | – | How large devices are drawn on screen |
No output schema declared.
No examples provided.
view_sim_screenshot Screenshot devices ~194
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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. |
No output schema declared.
No examples provided.
view_sim_set_devices Set devices ~53
Replaces the devices shown in a simulator tab and reloads them.
| Name | Type | Req | Description |
|---|---|---|---|
| devices | array | yes | – |
| tab_id | integer | – | Browser tab id from view_sim_status. Defaults to the focused simulator tab. |
No output schema declared.
No examples provided.
view_sim_set_options Set display options ~91
Changes zoom, frames and navigation sync for a simulator tab.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 |
No output schema declared.
No examples provided.
view_sim_status Simulator status ~29
Whether the extension is connected, and every open simulator tab with its devices, URLs and viewport sizes.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
view_sim_turn_off Turn the simulator off for a site ~45
Turns the simulator off for a hostname; its tabs show the normal page after a reload.
| Name | Type | Req | Description |
|---|---|---|---|
| host | string | yes | Hostname, e.g. localhost or example.com |
No output schema declared.
No examples provided.
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.
npm · view-sim-mcp
claude mcp add itelo-view-sim -- npx -y view-sim-mcp
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.