How to Use the Hacker News MCP in LangChain

Q: Can my LangChain agent write comments back to Hacker News?

No. The Hacker News server only exposes read tools like getitem and newstories. Your LangChain agent cannot post or mutate data on the platform.

Chain Hacker News data straight into your LangChain agents to track tech trends and read discussions without leaving your workspace.

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Connect Hacker News MCP to LangChain

Create your Vinkius account to connect Hacker News to LangChain and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Hacker News with LangChain

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Monitor Tech Trends via the Hacker News MCP Server

The `top_stories` tool pulls the current top 500 story IDs directly from the Hacker News front page into your active LangChain run. Your LangChain agent uses these IDs to identify rising tech topics before they hit mainstream channels. LangChain chains this Hacker News output directly into subsequent LLM decisions. You can inspect the exact token usage and latency of this Hacker News transfer inside your LangSmith dashboard.

Extract Clean Markdown Discussions

The `get_item` tool fetches specific Hacker News story details and converts messy HTML comment trees into clean Markdown for LangChain. This Markdown format fits directly into your LangChain agent's context window without breaking formatting constraints. LangChain handles this raw Hacker News text delivery through its standard document adapters. You don't have to write custom regex to strip out weird Hacker News forum markup inside your LangChain pipeline.

Track Real-Time Submissions

The `new_stories` tool gets the absolute latest Hacker News post IDs from the firehose to feed LangChain. Your LangChain ReAct agent checks this list periodically to spot fresh Hacker News updates. LangChain coordinates this polling loop by feeding the new Hacker News IDs into your decision chain. This keeps your automated LangChain newsletters or alert bots grounded in live Hacker News data.

Setup guide

Set up Hacker News MCP in LangChain

Prerequisites

Python 3.10+ installed
langchain-mcp-adapters + langgraph packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run pip install langchain-mcp-adapters langgraph langchain-openai. The MCP adapters package converts MCP tools into native LangChain BaseTool objects.
2

Connect via HTTP transport
Use MultiServerMCPClient with "transport": "http" pointing to your Vinkius endpoint. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Create a ReAct agent
Pass the discovered tools to create_react_agent() from LangGraph. The agent automatically routes Hacker News tool calls through the MCP protocol.
4

Run with any LLM
Swap ChatOpenAI for ChatAnthropic, ChatGoogleGenerativeAI, or any LangChain-compatible model. The MCP tools work identically across all providers.

agent.py

from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.prebuilt import create_react_agent
from langchain_openai import ChatOpenAI

async with MultiServerMCPClient({
    "hacker-news-mcp": {
        "transport": "http",
        "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    }
}) as client:
    tools = client.get_tools()

    agent = create_react_agent(
        ChatOpenAI(model="gpt-4o"),
        tools,
    )
    result = await agent.ainvoke({
        "messages": "List recent Hacker News transactions"
    })
    print(result["messages"][-1].content)

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Hacker News. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Hacker News MCP in LangChain

You install langchain-mcp-adapters and use MultiServerMCPClient to pull the Hacker News tools. Call client.get_tools() and pass the array directly to your LangChain agent constructor.

Yes. Because this MCP server runs standard endpoints, every LangChain call to `top_stories` or `get_item` shows up in LangSmith with exact execution times.

The MultiServerMCPClient handles aggregation of Hacker News and other endpoints automatically. You can combine this server with other APIs in the same LangChain execution chain.

No. The Hacker News server only exposes read tools like `get_item` and `new_stories`. Your LangChain agent cannot post or mutate data on the platform.

Only public Hacker News story IDs, metadata, and comment text pass through this MCP server. No personal user credentials or private Hacker News API keys are ever processed or stored by LangChain.

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