Snapdiff

ai.snapdiffPublished by snapdiff.aiv0.5.0Updated Nov 10, 2026

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

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Server details

Identifier: ai.snapdiff/mcp
Transport: STDIO
Runtime: Desktop only
Trust: Verified
Published: Sep 16, 2026

Security note

MCP servers receive tool arguments from a conversation and may perform external actions. Review what a server can do before you enable it, and give it only the access it needs.

The registry verified that this server's namespace belongs to snapdiff.ai. It runs from a package rather than a hosted endpoint, so there is no endpoint to match against that domain.

SourceWeft's checks cover whether the listing is complete and the endpoint answered; they do not review the server's code or what its tools do.

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Overview

AI-generated overview

Lets a coding assistant capture screenshots, visually diff web pages, and verify UI changes against a baseline via the SnapDiff API.

What you can do: Exposes four tools: verify a UI change against a stated intent and return a verdict plus next action, compare two pages or a page against a stored baseline with a diff percentage and highlighted image, capture a screenshot of any URL, and render HTML/CSS to an image. It calls the SnapDiff REST API and runs locally as a stdio subprocess, so Playwright-backed localhost tools run on your machine. The same tool surface is also offered by the hosted endpoint.
When to use it: Useful when a coding agent needs to check that a UI edit produced the intended visual change and no regressions, or when you want ad-hoc page diffs, screenshots, or generated images such as OG cards without leaving the assistant.
Requirements: Node.js with npx to run the npm package locally; a SnapDiff API key supplied in the SNAPDIFF_API_KEY environment variable; network access to the SnapDiff API. The optional SNAPDIFF_API_URL variable overrides the API base.

Before you install

Requires a SnapDiff API key, which is a billable account credential; keep it out of shared config files. The server sends URLs and HTML you submit to the SnapDiff API, so avoid pages or content you do not want leaving your machine. Verification depends on a configured project and baseline.

Installation

In SourceWeft

Open Snapdiff in the dashboard and add it to a workspace.
Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

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

Or edit ~/.claude/settings.json:

json

{  "mcpServers": {    "snapdiff": {      "command": "npx",      "args": ["-y", "@corralimited/snapdiff-mcp"],      "env": { "SNAPDIFF_API_KEY": "sk_live_..." }    }  }}

{  "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):

json

{  "mcpServers": {    "snapdiff": {      "command": "npx",      "args": ["-y", "@corralimited/snapdiff-mcp"],      "env": { "SNAPDIFF_API_KEY": "sk_live_..." }    }  }}

{  "mcpServers": {    "snapdiff": {      "command": "npx",      "args": ["-y", "@corralimited/snapdiff-mcp"],      "env": { "SNAPDIFF_API_KEY": "sk_live_..." }    }  }}

Cline (VS Code)

Cline > MCP Servers > Edit Config:

json

{  "mcpServers": {    "snapdiff": {      "command": "npx",      "args": ["-y", "@corralimited/snapdiff-mcp"],      "env": { "SNAPDIFF_API_KEY": "sk_live_..." }    }  }}

{  "mcpServers": {    "snapdiff": {      "command": "npx",      "args": ["-y", "@corralimited/snapdiff-mcp"],      "env": { "SNAPDIFF_API_KEY": "sk_live_..." }    }  }}

Zed

~/.config/zed/settings.json:

json

{  "context_servers": {    "snapdiff": {      "command": {        "path": "npx",        "args": ["-y", "@corralimited/snapdiff-mcp"],        "env": { "SNAPDIFF_API_KEY": "sk_live_..." }      }    }  }}

{  "context_servers": {    "snapdiff": {      "command": {        "path": "npx",        "args": ["-y", "@corralimited/snapdiff-mcp"],        "env": { "SNAPDIFF_API_KEY": "sk_live_..." }      }    }  }}

Continue

~/.continue/config.yaml:

yaml

mcpServers:  - name: snapdiff    command: npx    args: ["-y", "@corralimited/snapdiff-mcp"]    env:      SNAPDIFF_API_KEY: sk_live_...

mcpServers:  - name: snapdiff    command: npx    args: ["-y", "@corralimited/snapdiff-mcp"]    env:      SNAPDIFF_API_KEY: sk_live_...

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

There are no CLI flags beyond --help.

License

MIT — see LICENSE.

Source: README.md at commit e420175

Tools

SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

v0.5.0LatestSep 16, 2026

Score

50% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

Reached in the last 30 days25 pts
Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.
Auth declared10 pts
Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.
Tools listed15 pts
Answer tools/list without a credential, or ship a package that starts in a sandbox without one.
DescriptionRequired15 pts
Logo10 pts
Documentation15 pts
License10 pts

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`.