Behavioral litmus harness for MCP servers — the open @polygraphso/litmus package (CLI, library, MCP server).
Setup
Choose your client, copy the config, then fill in any required environment variables.
Local
claude mcp add litmus -- npx -y @polygraphso/litmus~/.codex/config.toml
[mcp_servers.litmus]
command = "npx"
args = ["-y", "@polygraphso/litmus"]
# codex mcp add litmus -- npx -y @polygraphso/litmus~/.cursor/mcp.json
{
"mcpServers": {
"litmus": {
"command": "npx",
"args": [
"-y",
"@polygraphso/litmus"
]
}
}
}.vscode/mcp.json
{
"servers": {
"litmus": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@polygraphso/litmus"
]
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"litmus": {
"command": "npx",
"args": [
"-y",
"@polygraphso/litmus"
]
}
}
}claude_desktop_config.json
{
"mcpServers": {
"litmus": {
"command": "npx",
"args": [
"-y",
"@polygraphso/litmus"
]
}
}
}.trae/mcp.json
{
"mcpServers": {
"litmus": {
"command": "npx",
"args": [
"-y",
"@polygraphso/litmus"
]
}
}
}Remote
claude mcp add --transport http litmus https://polygraph.so/api/mcp~/.codex/config.toml
[mcp_servers.litmus]
url = "https://polygraph.so/api/mcp"
# codex mcp add litmus --url https://polygraph.so/api/mcp~/.cursor/mcp.json
{
"mcpServers": {
"litmus": {
"url": "https://polygraph.so/api/mcp"
}
}
}.vscode/mcp.json
{
"servers": {
"litmus": {
"type": "http",
"url": "https://polygraph.so/api/mcp"
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"litmus": {
"httpUrl": "https://polygraph.so/api/mcp"
}
}
}claude_desktop_config.json · Customize › Connectors › Add custom connector
{
"mcpServers": {
"litmus": {
"command": "npx",
"args": [
"-y",
"mcp-remote",
"https://polygraph.so/api/mcp"
]
}
}
}.trae/mcp.json
{
"mcpServers": {
"litmus": {
"url": "https://polygraph.so/api/mcp"
}
}
}