Litmus
Grade MCP servers A to F with the open behavioral litmus. npm: full toolset; hosted: lookups only.
Connect it
Settings → Connectors → Add custom connector
URL: https://polygraph.so/api/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://polygraph.so/api/mcp{
"mcpServers": {
"litmus": {
"url": "https://polygraph.so/api/mcp"
}
}
}claude mcp add --transport http litmus https://polygraph.so/api/mcp{
"servers": {
"litmus": {
"type": "http",
"url": "https://polygraph.so/api/mcp"
}
}
}{
"mcpServers": {
"litmus": {
"command": "npx",
"args": [
"-y",
"@polygraphso/litmus@0.36.0"
]
}
}
}claude mcp add litmus -- npx -y @polygraphso/litmus@0.36.03 tools, verified live
check_serverread-onlyRead a server's published behavioral grade (A-F) from polygraph.so in under a second; no execution. The pre-flight check before recommending or installing an MCP server. On a miss it returns not_available (unevaluated: neither safe nor unsafe) with next steps.
list_serversread-onlyServers with a published polygraph grade, sorted A-first then by ref. Returns up to `limit` rows starting at `offset` (default limit 25, capped at 100 per call); `grade` restricts to one letter. `summary` always covers the full graded corpus (a total plus a count per grade), regardless of `grade`, `limit`, or `offset`.
request_gradeHosted grading is discontinued. This tool returns gone. Existing published grades remain available via check_server / list_servers. To grade a server yourself, run the open harness: npx -y -p @polygraphso/litmus polygraphso-litmus litmus <server_ref>.
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