io.github.polygraphso/litmus

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

What does this entry provide?

io.github.polygraphso/litmus is an MCP server entry in ChatHome Skills, sourced from Official MCP Registry and scored 67/100. As a Model Context Protocol server, it exposes tools that MCP-compatible LLM clients such as Claude, Cursor, and Copilot can call directly, extending an agent's reach beyond its built-in capabilities. ChatHome Skills discovered this entry through its daily ingest of official registries and GitHub discovery queries, and re-verifies repository facts, freshness signals, and install metadata on every run. The quality score weighs official-registry presence, a working install command, license clarity, GitHub star trajectory, and repository freshness — the full formula is on the Sources page. The install command above is ready to copy. Review the last-pushed date and repository status before adding io.github.polygraphso/litmus to a production agent workflow; the snapshot facts below are point-in-time values from the most recent ingest.

Snapshot facts

Source: Official MCP Registry
Quality: 67/100
Install method: streamable-http
Repo: polygraphso/litmus
Repo updated: Jul 20, 2026

Install command

mcp add io.github.polygraphso/litmus https://polygraph.so/api/mcp

Install method: streamable-http

Review the upstream source before running this command.

GitHub project Homepage

Quality

Repo stars

Repo updated

Jul 20, 2026

How is this score calculated?

Weighted across six dimensions, scored 0-100.
Provenance (25): listed in an official or curated registry.
Installability (25): a runnable install command beats a declared transport, which beats a source checkout.
Maintenance (20): recency of the last push; archived entries score zero here.
Adoption (20): repository stars on a log curve.

MCP manifest

{
  "_meta": {
    "io.modelcontextprotocol.registry/official": {
      "status": "active",
      "isLatest": true,
      "updatedAt": "2026-07-20T15:52:22.440934Z",
      "publishedAt": "2026-07-20T15:52:22.440934Z",
      "statusChangedAt": "2026-07-20T15:52:22.440934Z"
    }
  },
  "server": {
    "name": "io.github.polygraphso/litmus",
    "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
    "remotes": [
      {
        "url": "https://polygraph.so/api/mcp",
        "type": "streamable-http"
      }
    ],
    "version": "0.36.0",
    "packages": [
      {
        "version": "0.36.0",
        "transport": {
          "type": "stdio"
        },
        "identifier": "@polygraphso/litmus",
        "registryType": "npm",
        "registryBaseUrl": "https://registry.npmjs.org",
        "packageArguments": [
          {
            "type": "positional",
            "value": "polygraphso-litmus-mcp"
          }
        ],
        "environmentVariables": [
          {
            "name": "POLYGRAPH_API_URL",
            "default": "https://polygraph.so",
            "description": "Base URL for published-grade lookups (check_server, list_servers, request_grade) and attestation resolution."
          },
          {
            "name": "NEXT_PUBLIC_POLYGRAPH_NETWORK",
            "default": "base",
            "description": "Which network to read attestations from: 'base' (mainnet, default) or 'base-sepolia' (testnet)."
          }
        ]
      }
    ],
    "repository": {
      "url": "https://github.com/polygraphso/litmus",
      "source": "github"
    },
    "websiteUrl": "https://polygraph.so",
    "description": "Grade MCP servers A to F with the open behavioral litmus. npm: full toolset; hosted: lookups only."
  }
}

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