Visual verification for UI changes: declare what a change should affect, diff the page against a baseline and flag differences outside that scope.
Setup
Choose your client, copy the config, then fill in any required environment variables.
claude mcp add snapdiff --env SNAPDIFF_API_KEY='<SNAPDIFF_API_KEY>' -- npx -y @corralimited/snapdiff-mcp~/.codex/config.toml
[mcp_servers.snapdiff]
command = "npx"
args = ["-y", "@corralimited/snapdiff-mcp"]
env = { SNAPDIFF_API_KEY = "<SNAPDIFF_API_KEY>" }
# codex mcp add snapdiff --env SNAPDIFF_API_KEY='<SNAPDIFF_API_KEY>' -- npx -y @corralimited/snapdiff-mcp~/.cursor/mcp.json
{
"mcpServers": {
"snapdiff": {
"command": "npx",
"args": [
"-y",
"@corralimited/snapdiff-mcp"
],
"env": {
"SNAPDIFF_API_KEY": "<SNAPDIFF_API_KEY>"
}
}
}
}.vscode/mcp.json
{
"servers": {
"snapdiff": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@corralimited/snapdiff-mcp"
],
"env": {
"SNAPDIFF_API_KEY": "<SNAPDIFF_API_KEY>"
}
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"snapdiff": {
"command": "npx",
"args": [
"-y",
"@corralimited/snapdiff-mcp"
],
"env": {
"SNAPDIFF_API_KEY": "<SNAPDIFF_API_KEY>"
}
}
}
}claude_desktop_config.json
{
"mcpServers": {
"snapdiff": {
"command": "npx",
"args": [
"-y",
"@corralimited/snapdiff-mcp"
],
"env": {
"SNAPDIFF_API_KEY": "<SNAPDIFF_API_KEY>"
}
}
}
}.trae/mcp.json
{
"mcpServers": {
"snapdiff": {
"command": "npx",
"args": [
"-y",
"@corralimited/snapdiff-mcp"
],
"env": {
"SNAPDIFF_API_KEY": "<SNAPDIFF_API_KEY>"
}
}
}
}Environment variables
SNAPDIFF_API_KEY
Replace the placeholders with your own credentials and keep them out of version control.