browser-automationvisual-testingscreenshotshtml-rendering
MCP server for visual UI verification, screenshot capture, page diffing, and HTML/CSS rendering via SnapDiff API.
Quick Install
Automated & IDE SetupCopy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.
We couldn’t automatically confirm this listing starts correctly
We ran the install command below but it didn't respond within our test window — this can mean a slow first-time install rather than a real problem.
npx -y @corralimited/snapdiff-mcpNo response to initialize.
This is an experimental automated check and can have false negatives — missing environment variables, a slow cold install, etc. It doesn’t necessarily mean something’s wrong. Last checked 1mo ago.
Manual Client & Custom JSON ConfigExpand JSON ▾
Client Config & Setup
Choose your client or environment
Target File:
💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.
Overview
Use cases
Verify if a UI change matches the declared intent
Compare two web pages visually to detect differences
Capture a screenshot of a given URL
Render HTML/CSS content into an image
Check if a page has changed compared to a stored baseline
Key features
Intent-aware visual UI change verification with verdicts
Visual diffing between URLs or against baselines
Screenshot capture of arbitrary web pages
HTML/CSS rendering to images (e.g., OG cards, email headers)
Supports both stdio and HTTP transport modes
Capabilities & Tool Schemas (4)
Inspect callable tools, capabilities, and parameters exposed to AI agents by Snapdiff MCP.
snapdiff_verify_ui_changeChecks whether a visual change matches the agent's stated intent. Returns `verdict` (`pass` / `expected_change_detected` / `unexpected_regression` / `no_change_detected` / `needs_human_review`) and a `next_action`. Requires a project + baseline. **Use this in the verification loop.
snapdiff_compare_pagesRaw visual diff between two URLs, or a URL vs. a stored project baseline. Use for ad-hoc diffs that don't fit the verify-ui-change verdict shape.
snapdiff_capture_screenshotSingle screenshot of a URL.
snapdiff_html_to_imageRender HTML/CSS to an image (OG cards, social images, email headers).
Documentation Overview
@corralimited/snapdiff-mcp
Standalone MCP server for SnapDiff. Exposes four tools to local agents:
- Compare two web pages visually — diff percentage plus a highlighted diff image
- Capture a screenshot of any URL
- Check whether a page changed vs. a previous capture
- Render HTML/CSS to an image (OG cards, social images, email headers)
Hits the public SnapDiff REST API. Bring your own API key.
Quickstart
Get an API key at https://snapdiff.ai/dashboard, then drop the snippet for your agent below.
Claude Code
Or edit ~/.claude/settings.json:
Cursor
~/.cursor/mcp.json (or project-level .cursor/mcp.json):
Cline (VS Code)
Cline > MCP Servers > Edit Config:
Zed
~/.config/zed/settings.json:
Continue
~/.continue/config.yaml:
Anything else with a generic stdio MCP slot
Tools
| Name | Purpose |
|---|---|
snapdiff_verify_ui_change | Checks whether a visual change matches the agent's stated intent. Returns verdict (pass / expected_change_detected / unexpected_regression / no_change_detected / needs_human_review) and a next_action. Requires a project + baseline. Use this in the verification loop. |
snapdiff_compare_pages | Raw visual diff between two URLs, or a URL vs. a stored project baseline. Use for ad-hoc diffs that don't fit the verify-ui-change verdict shape. |
snapdiff_capture_screenshot | Single screenshot of a URL. |
snapdiff_html_to_image | Render HTML/CSS to an image (OG cards, social images, email headers). |
Schemas live in src/tools/ and are exported from @corralimited/snapdiff-mcp/tools.
The hosted SnapDiff backend imports the same schemas so its in-process /mcp endpoint and this
standalone stdio server expose an identical surface — agents see the same tool names, descriptions,
and parameters whether they connect to https://api.snapdiff.ai/mcp or run this server locally.
Remote HTTP access
This package speaks stdio only — your editor spawns it as a subprocess, and the Playwright-backed localhost tools run on your machine, where your dev server actually is. It does not open a port.
If you need an HTTP endpoint, use the hosted one at https://mcp.snapdiff.ai/mcp,
which authenticates every request with your API key and exposes the same tool surface.
Configuration
| Env var | Required | Notes |
|---|---|---|
SNAPDIFF_API_KEY | yes | Get one at https://snapdiff.ai/dashboard |
SNAPDIFF_API_URL | no | Override the API base. Defaults to https://api.snapdiff.ai/v1. |
There are no CLI flags beyond --help.
License
MIT — see LICENSE.
Related MCP Servers
Adoption & maintenance
Factual signals from GitHub, npm, and our automated checks — not a rating.
GitHub stars
5
Stargazers on the source repository.
npm downloads
483
Package downloads in the last 30 days.
Last commit
14d ago
Most recent push to the default branch.
Install check
Inconclusive
Didn't respond in our test window — often a slow first install.
Tools exposed
4
Callable tools this server registers over MCP.
Directory activity
2 views
Config copies, upvotes, and views on AllMCPs.
Reviews
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Frequently Asked Questions about Snapdiff MCP
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[](https://allmcps.com/mcp/corralimited-snapdiff-mcp)HTML Embed
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CategoryBrowser Automation
PricingBring your own API key (usage-based cost)
10/10 checks healthy over the last 32d
61Quality signal: Good · 61/100How this signal is calculated ▾
Server availabilityNot measured
Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.
Verified ownership10/20
Documentation & tools28/30
Adoption & activity8/15
Community engagement0/10
A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.
Supply-chain signal
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Scanned 23d ago via OSV.dev · @corralimited/snapdiff-mcp (npm)
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