Referring domains for a target

You are wiring up the agntdata "SEO" API to use this endpoint: Referring domains for a target.

1. CONNECT over MCP (preferred). Add the superagnt MCP server, then let the client
   run OAuth on first tool call — no token to paste:
     claude mcp add --scope user --transport http superagnt https://mcp.superagnt.com/mcp
     claude mcp login superagnt
   MCP endpoint: https://mcp.superagnt.com/mcp
   After connecting, the tool you want is named exactly:
     data_seo_referring_domains
   Call agnt_tools_search or agnt_tools_list_enabled to confirm it is available.

2. REST fallback (if you are not using MCP):
     POST https://api.agntdata.dev/referring-domains
     Header: Authorization: Bearer <YOUR_AGNTDATA_API_KEY>
   Required parameters:
    - target (string, required) — Domain, subdomain or full page URL to list referring domains for.
   Optional parameters:
    - limit (integer, optional) — Max referring domains to return. Default 100. Cost scales with rows.
    - offset (integer, optional) — Pagination offset.
    - exclude_internal_backlinks (boolean, optional) — Ignore links from the target to itself. Default true.
    - filters (array, optional) — Optional filter expression as [field, operator, value] triples. Operators: =, <>, <, <=, >, >=, in, not_in, like, not_like. Recipe: [["rank",">",100]] keeps stronger referring domains (rank is the referring domain's authority, higher is better).
    - order_by (array, optional) — Sort rules, e.g. ["rank,desc"].

3. COST & KEY. This endpoint is priced per call in credits, and each successful response reports its own cost in its meta.costCents field. Only successful calls are charged.
   Get an agntdata API key at https://app.agntdata.dev.

4. TEST. Connect the server (or set the key), discover the tool
   (data_seo_referring_domains), run one minimal call with just the required parameters,
   and report back the shape of the JSON response (top-level fields).

Reference (machine-readable variant): https://superagnt.com/docs/apis/seo/endpoints/referring_domains.md

{
  "name": "referring_domains",
  "description": "Lists the domains linking to a target, each with rank, backlink count, first/last seen dates and spam score. This is the outreach-prospecting call: the sites already linking to a competitor are the sites most likely to link to you. Cost scales with rows; default 100 is right for most pulls.",
  "parameters": {
    "type": "object",
    "properties": {
      "target": {
        "type": "string",
        "description": "Domain, subdomain or full page URL to list referring domains for."
      },
      "limit": {
        "type": "integer",
        "minimum": 1,
        "maximum": 1000,
        "default": 100,
        "description": "Max referring domains to return. Default 100. Cost scales with rows."
      },
      "offset": {
        "type": "integer",
        "minimum": 0,
        "description": "Pagination offset."
      },
      "exclude_internal_backlinks": {
        "type": "boolean",
        "default": true,
        "description": "Ignore links from the target to itself. Default true."
      },
      "filters": {
        "type": "array",
        "items": {},
        "description": "Optional filter expression as [field, operator, value] triples. Operators: =, <>, <, <=, >, >=, in, not_in, like, not_like. Recipe: [[\"rank\",\">\",100]] keeps stronger referring domains (rank is the referring domain's authority, higher is better)."
      },
      "order_by": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "Sort rules, e.g. [\"rank,desc\"]."
      }
    },
    "required": [
      "target"
    ]
  }
}