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.
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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
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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.
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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