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ai.snapdiff/mcp

Official registry Developer tools

Visual-diff & change-detection tools that catch agentic UI drift for coding agents.

Source code Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package @corralimited/snapdiff-mcp
Claude Code 
claude mcp add ai-snapdiff-mcp -e 'SNAPDIFF_API_KEY=<your snapdiff_api_key>' -e 'SNAPDIFF_API_URL=<SNAPDIFF_API_URL>' -- npx -y @corralimited/snapdiff-mcp@0.5.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "ai-snapdiff-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "@corralimited/snapdiff-mcp@0.5.0"
            ],
            "env": {
                "SNAPDIFF_API_KEY": "<your snapdiff_api_key>",
                "SNAPDIFF_API_URL": "<SNAPDIFF_API_URL>"
            }
        }
    }
}

Environment variables

  • SNAPDIFF_API_KEY required secret SnapDiff API key. Get one at https://snapdiff.ai/dashboard.
  • SNAPDIFF_API_URL Override the API base URL. Defaults to https://api.snapdiff.ai/v1.

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. @corralimited/snapdiff-mcp
  2. Quickstart
  3. Tools
  4. Remote HTTP access
  5. Configuration
  6. License

@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

NamePurpose
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).

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 varRequiredNotes
SNAPDIFF_API_KEYyesGet one at https://snapdiff.ai/dashboard
SNAPDIFF_API_URLnoOverride the API base. Defaults to https://api.snapdiff.ai/v1.

There are no CLI flags beyond --help.

License

MIT — see LICENSE.

Frequently asked questions

What is ai.snapdiff/mcp?

Visual-diff & change-detection tools that catch agentic UI drift for coding agents.

How do I install ai.snapdiff/mcp?

It runs on your machine. In Claude Code: claude mcp add ai-snapdiff-mcp -e 'SNAPDIFF_API_KEY=<your snapdiff_api_key>' -e 'SNAPDIFF_API_URL=<SNAPDIFF_API_URL>' -- npx -y @corralimited/snapdiff-mcp@0.5.0. For other clients, paste the JSON configuration from this page into their MCP settings.

Does ai.snapdiff/mcp need an API key?

Yes. It expects SNAPDIFF_API_KEY, which you set in its configuration.

Is ai.snapdiff/mcp open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains ai.snapdiff/mcp?

It is published by corralimited. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.