Groundlink MCP Server

Use Groundlink's cited web-search results from any Model Context Protocol (MCP) host. The server exposes one focused tool, groundlink_search, which sends a query to Groundlink and returns source-bearing results (title, url, snippet, and source) for the model to use when it needs evidence rather than a guess.

Groundlink currently combines Wikipedia and DuckDuckGo results. Each Groundlink API key includes 100 free test queries; after that, prepaid usage is $0.001 per query (one credit per query).

Package: groundlink-mcp@0.1.1 is published on npm. Source: https://github.com/ohhavefun/groundlink

• Live API documentation: https://9ea69cec60fa01f65bbb647a092bcbb4.ctonew.app/docs
• Pricing and credits: https://9ea69cec60fa01f65bbb647a092bcbb4.ctonew.app/pricing

This repository is the home of Groundlink's official developer integrations. There are two, both maintained here:

Both use the same free trial keys (100 queries) from the Groundlink onboarding, then prepaid usage at $0.001/query.

Where Groundlink is listed

langchain-groundlink (Python / LangChain)

Use Groundlink's cited search from any Python agent or BaseTool pipeline. The tool returns source-bearing results (title, url, snippet, source) so your agent answers from evidence and can cite it.

Install from GitHub (the package is intentionally not on PyPI):

pip install "langchain-groundlink @ git+https://github.com/ohhavefun/groundlink#subdirectory=langchain-groundlink"

Quick usage (10 seconds): get a free key from the docs, then:

from langchain_groundlink import GroundlinkSearchTool

tool = GroundlinkSearchTool(api_key="glk_your_trial_key")  # or export GROUNDLINK_API_KEY
result = tool.invoke({"query": "Who was Ada Lovelace?"})
print(result)

Full usage, configuration, and error handling are in langchain-groundlink/README.md.

Groundlink MCP Server

Use Groundlink's cited web-search results from any Model Context Protocol (MCP) host below.

Use it for factual questions where the host should return URLs/sources with its answer. The MCP server is deliberately thin: it forwards the query to the Groundlink HTTPS API and returns the API response over MCP stdio.

Install and run

You need a Groundlink API key (glk_...). Ask the Groundlink operator for one or obtain one through the Groundlink onboarding flow.

npm install -g groundlink-mcp
export GROUNDLINK_API_KEY=glk_your_key_here
groundlink-mcp

Alternatively, an MCP host can execute the package without a global install:

npx -y groundlink-mcp

The process uses stdio; it does not open an HTTP port or print normal output to stdout. MCP hosts should launch it rather than running it interactively.

Configuration

Claude Desktop configuration

Add this entry to Claude Desktop's MCP configuration file and restart Claude Desktop. Keep the API key private: do not commit it to a repository or share the configuration file.

{
  "mcpServers": {
    "groundlink": {
      "command": "npx",
      "args": ["-y", "groundlink-mcp"],
      "env": {
        "GROUNDLINK_API_KEY": "glk_your_key_here"
      }
    }
  }
}

If the package is installed globally, use "command": "groundlink-mcp" and omit args. For hosts that need an absolute executable path, point command at the installed groundlink-mcp binary.

What happens on errors

• Missing GROUNDLINK_API_KEY: the server exits at startup with a clear setup error.
• API key rejected (401): returned to the MCP host as a tool error; correct the key rather than retrying.
• No remaining free or prepaid credits (402): returned as a tool error; fund the key before another search.
• Search-source outage (502): returned as a tool error; a short retry may help.

Marketplace description

Groundlink — cited web search for MCP. Give Claude, Cursor, and other MCP hosts one groundlink_search tool that returns source-bearing results instead of unsupported factual guesses. Every key starts with 100 free tests, then usage is $0.001 per query through prepaid credits.

Development and release checks

bun install
bun run typecheck
bun run build             # emits executable dist/index.js
bun run test              # MCP stdio smoke test
npm run pack:check        # inspect the npm tarball without publishing

The npm package intentionally ships only the compiled dist/ runtime, this README, and npm's required package metadata. Source and smoke tests stay out of the tarball.