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Grade MCP servers A–F with the open behavioral litmus: reproducible, content-addressed evidence.
npx @getmcp/cli add io.github.polygraphso/litmusRequires Node.js 18+. Community-contributed server. Review source before installing.
Config file: ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"io.github.polygraphso/litmus": {
"command": "npx",
"args": [
"-y",
"@polygraphso/litmus",
"polygraphso-litmus-mcp"
],
"env": {
"POLYGRAPH_API_URL": "https://polygraph.so"
}
}
}
}