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Visual-diff & change-detection tools that catch agentic UI drift for coding agents.
About
Visual-diff & change-detection tools that catch agentic UI drift for coding agents.
Security Report
Valid MCP server (3 strong, 5 medium validity signals). No known CVEs in dependencies. Package registry verified. Imported from the Official MCP Registry.
13 files analyzed · 1 issue found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Environment variable: SNAPDIFF_API_KEY
Environment variable: SNAPDIFF_API_URL
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"ai-snapdiff-mcp": {
"env": {
"SNAPDIFF_API_KEY": "your-snapdiff-api-key-here",
"SNAPDIFF_API_URL": "your-snapdiff-api-url-here"
},
"args": [
"-y",
"@corralimited/snapdiff-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
@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
claude mcp add snapdiff -e SNAPDIFF_API_KEY=sk_live_... -- npx -y @corralimited/snapdiff-mcp
Or edit ~/.claude/settings.json:
{
"mcpServers": {
"snapdiff": {
"command": "npx",
"args": ["-y", "@corralimited/snapdiff-mcp"],
"env": { "SNAPDIFF_API_KEY": "sk_live_..." }
}
}
}
Cursor
~/.cursor/mcp.json (or project-level .cursor/mcp.json):
{
"mcpServers": {
"snapdiff": {
"command": "npx",
"args": ["-y", "@corralimited/snapdiff-mcp"],
"env": { "SNAPDIFF_API_KEY": "sk_live_..." }
}
}
}
Cline (VS Code)
Cline > MCP Servers > Edit Config:
{
"mcpServers": {
"snapdiff": {
"command": "npx",
"args": ["-y", "@corralimited/snapdiff-mcp"],
"env": { "SNAPDIFF_API_KEY": "sk_live_..." }
}
}
}
Zed
~/.config/zed/settings.json:
{
"context_servers": {
"snapdiff": {
"command": {
"path": "npx",
"args": ["-y", "@corralimited/snapdiff-mcp"],
"env": { "SNAPDIFF_API_KEY": "sk_live_..." }
}
}
}
}
Continue
~/.continue/config.yaml:
mcpServers:
- name: snapdiff
command: npx
args: ["-y", "@corralimited/snapdiff-mcp"]
env:
SNAPDIFF_API_KEY: sk_live_...
Anything else with a generic stdio MCP slot
command: npx
args: -y @corralimited/snapdiff-mcp
env: SNAPDIFF_API_KEY=sk_live_...
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.
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