Litmus MCP Server
by polygraphsoio.github.polygraphso/litmusv0.36.0
Grade MCP servers A to F with the open behavioral litmus. npm: full toolset; hosted: lookups only.
context tax
queued
security
queued
cold start
queued
freshness
Maintained3mo ago
Install Litmus MCP server
Install in Claude Code
claude mcp add litmus -- npx -y @polygraphso/litmus polygraphso-litmus-mcpInstall in Cursor
{
"mcpServers": {
"litmus": {
"command": "npx",
"args": [
"-y",
"@polygraphso/litmus",
"polygraphso-litmus-mcp"
]
}
}
}Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).
Install in Claude Desktop
{
"mcpServers": {
"litmus": {
"command": "npx",
"args": [
"-y",
"@polygraphso/litmus",
"polygraphso-litmus-mcp"
]
}
}
}Settings → Developer → Edit Config (claude_desktop_config.json), then restart.
Install in VS Code
{
"servers": {
"litmus": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@polygraphso/litmus",
"polygraphso-litmus-mcp"
]
}
}
}Add to .vscode/mcp.json in your workspace.
Install in Windsurf
{
"mcpServers": {
"litmus": {
"command": "npx",
"args": [
"-y",
"@polygraphso/litmus",
"polygraphso-litmus-mcp"
]
}
}
}Add to ~/.codeium/windsurf/mcp_config.json.
Configuration
| Variable | Required | Secret | Description |
|---|---|---|---|
| POLYGRAPH_API_URL | — | — | Base URL for published-grade lookups (check_server, list_servers, request_grade) and attestation resolution. |
| NEXT_PUBLIC_POLYGRAPH_NETWORK | — | — | Which network to read attestations from: 'base' (mainnet, default) or 'base-sepolia' (testnet). |
Remote endpoints
- streamable-http
https://polygraph.so/api/mcp
Freshness
Maintained — last maintenance signal 3mo ago. The newest of the signals below sets the band.
Last commit (default branch)
2026-07-20 · 3mo ago · GitHub
Latest release
2026-07-20 · 3mo ago · GitHub · litmus-v0.36.0
Package published
no data · npm/PyPI
Registry entry updated
2026-07-20 · 3mo ago · official registry · v0.36.0
FAQ
›How do I install the Litmus MCP server in Claude Code?
Run: claude mcp add litmus -- npx -y @polygraphso/litmus polygraphso-litmus-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.
›Does Litmus require an API key?
No required environment variables are declared in its published metadata.
›Can I use Litmus as a remote (hosted) MCP server?
Yes — it offers both a hosted endpoint and a local stdio package.
›Is Litmus in the official MCP registry?
Yes, as io.github.polygraphso/litmus.