duckdata

duckdata is a small local bridge to the hosted HasData DuckDuckGo MCP server, which returns DuckDuckGo search results as JSON. Ask for a query and it comes back as ranked organic results — title, URL, snippet, displayed URL, position, date, sitelinks and video metadata — with the ads kept in their own separate array, plus the Search Assist AI answer when the upstream supplies one.

The bridge holds no results of its own. It serves the upstream server's tool list locally, exactly as captured from the live endpoint, and forwards each tool call upstream, returning the result untouched. The captured surface is a single read-only search fetch. There is no write, messaging, or payment tool in it.

Tools

• hasdata_duckduckgo_serp_getSearchResults — fetch a DuckDuckGo SERP. The captured schema carries no required array: q is the search term (required unless nextPageToken is provided, which carries the query it continues). Target a region with kl (a <country>-<language> code such as us-en or de-de, across 37 regions), or combine cc with setLang instead — kl takes precedence. Filter adult content with safeSearch (off, moderate, or strict), pick a form factor with deviceType (desktop, mobile, or tablet), and page with the opaque nextPageToken returned by the previous response.

Configuration

• HASDATA_DUCKDUCKGO_MCP_URL (optional) — override the upstream endpoint. Defaults to https://mcp.hasdata.com/mcp?apis=duckduckgo. (The override hook is this rebuild's own labelled reconstruction.)
• HASDATA_API_KEY (optional) — when set, every upstream request carries an x-api-key: <key> header, for the caller's own HasData API key. When it is not set, no key header is sent. (The header name and the env name are pinned by the original's registry record; forwarding the key from this env var is a labelled reconstruction — the original surface was captured keyless.)

Forwarding mechanics

On the first tool call the client opens a streamable HTTP session with the upstream: a JSON-RPC initialize request (protocolVersion 2025-03-26, clientInfo name duckdata), then a notifications/initialized notification, then the tools/call request carrying the caller's arguments unchanged. When the upstream answers initialize with an Mcp-Session-Id header, that value rides on every later request of the session, which is reused for the life of the process. Replies may arrive as plain JSON or as server-sent events; both are read.

Successful upstream results pass through verbatim, including any isError flag the upstream sets. Failures — a JSON-RPC error, a non-2xx status, an unreadable response, or a request that cannot be completed — come back as an isError result whose text starts with duckdata error: (this rendering is this rebuild's own labelled reconstruction).

CLI

The tool is also a subcommand taking one JSON argument string:

npx @reneturcios/duckdata hasdata_duckduckgo_serp_getSearchResults '{"q":"open source search","kl":"us-en","safeSearch":"moderate","deviceType":"desktop"}'
npx @reneturcios/duckdata --version

Exit codes: 0 on success, 1 on an isError result, 2 on a usage error.

MCP server

npx -y @reneturcios/duckdata mcp

MCP client config:

{
  "mcpServers": {
    "duckdata": {
      "command": "npx",
      "args": ["-y", "@reneturcios/duckdata", "mcp"]
    }
  }
}

Docker

docker run -i ghcr.io/cloudcorprecords/duckdata
docker run --rm ghcr.io/cloudcorprecords/duckdata --version

The container's default command is mcp, so the first form is a stdio MCP server; any other arguments reach the CLI normally.

Development

npm install
npm run build
npm test
npm run dev

The test suite runs entirely against a stubbed JSON-RPC upstream — no live network calls.

License

MIT — see LICENSE.