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100
MCP live MCP 2025-11-25 streamable-http

io.github.polygraphso/litmus

io.github.polygraphso/litmus

Grade MCP servers A to F with the open behavioral litmus. npm: full toolset; hosted: lookups only.

Uptime
100.0%
1 direct probes · 30d
Response
699ms
last probe
Tools
3
callable
Resources
0
readable
Prompts
0
available
Primary URL
https://polygraph.so/api/mcp

Tools · 3

check_server

Read 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_avail…

list_servers

Servers 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. `summ…

request_grade

Record a grade request with polygraph.so. Recording is free; only real, plausibly-MCP targets are accepted. Grading starts once the request's one-time $1 USD fee is paid: payment.payUrl is the human/b…

How to use

Add to your Claude Desktop / Cursor / Cline MCP config:

{
  "mcpServers": {
    "io.github.polygraphso/litmus": {
      "url": "https://polygraph.so/api/mcp",
      "transport": "streamable-http"
    }
  }
}