Domains linking to competitors but not you

You are wiring up the agntdata "SEO" API to use this endpoint: Domains linking to competitors but not you.

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_backlink_gap
   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/backlink-gap
     Header: Authorization: Bearer <YOUR_AGNTDATA_API_KEY>
   Required parameters:
    - targets (array, required) — Competitor domains whose backlink sources to intersect (1-20).
   Optional parameters:
    - exclude_targets (array, optional) — Domains the referring sites must NOT already link to. Put your own domain here.
    - limit (integer, optional) — Max referring domains to return. Default 100.
    - offset (integer, optional) — Pagination offset.
    - filters (array, optional) — Optional filter expression, e.g. minimum domain rank.
    - order_by (array, optional) — Sort rules, e.g. ["1.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_backlink_gap), 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/backlink_gap.md

{
  "name": "backlink_gap",
  "description": "Finds domains that link to one or more competitor targets but NOT to the excluded target (you). The output is a ready-made link-building prospect list; chain it with an email-finder tool to turn rows into outreach. Response shape: each row's referring domain lives at items[].domain_intersection[\"1\"], [\"2\"], ... keyed by the 1-based index of your `targets` array, with that referring domain's own authority score in `rank` (0-1000ish, higher is stronger; this is the referring domain's rank, a different metric from the target-domain rank in backlinks_summary). Default sort is rank descending. When ranking prospects, check referring_domains and backlinks together — a huge backlink count with few referring domains usually means sitewide boilerplate links, not authority.",
  "parameters": {
    "type": "object",
    "properties": {
      "targets": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "minItems": 1,
        "maxItems": 20,
        "description": "Competitor domains whose backlink sources to intersect (1-20)."
      },
      "exclude_targets": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "maxItems": 10,
        "description": "Domains the referring sites must NOT already link to. Put your own domain here."
      },
      "limit": {
        "type": "integer",
        "minimum": 1,
        "maximum": 1000,
        "default": 100,
        "description": "Max referring domains to return. Default 100."
      },
      "offset": {
        "type": "integer",
        "minimum": 0,
        "description": "Pagination offset."
      },
      "filters": {
        "type": "array",
        "items": {},
        "description": "Optional filter expression, e.g. minimum domain rank."
      },
      "order_by": {
        "type": "array",
        "items": {
          "type": "string"
        },
        "description": "Sort rules, e.g. [\"1.rank,desc\"]."
      }
    },
    "required": [
      "targets"
    ]
  }
}