How to integrate Hashnode MCP with LangChain

This guide walks you through connecting Hashnode to LangChain using the Composio tool router. By the end, you'll have a working Hashnode agent that can list your most recent hashnode articles, check if 'devjournal.com' domain is available, fetch popular tags for trending topics through natural language commands. This guide will help you understand how to give your LangChain agent real control over a Hashnode account through Composio's Hashnode MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Hashnode

Api Key

Hashnode is a blogging platform designed for developers to create, manage, and share technical content. It streamlines publishing and helps grow your dev audience effortlessly.

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Introduction

This guide will help you understand how to give your LangChain agent real control over a Hashnode account through Composio's Hashnode MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Hashnode with

OpenAI Agents SDK Claude Agent SDK Claude Code Claude Cowork Codex OpenClaw Hermes CLI Google ADK Vercel AI SDK Mastra AI LlamaIndex CrewAI

TL;DR

Here's what you'll learn:

Get and set up your OpenAI and Composio API keys
Connect your Hashnode project to Composio
Create a Tool Router MCP session for Hashnode
Initialize an MCP client and retrieve Hashnode tools
Build a LangChain agent that can interact with Hashnode
Set up an interactive chat interface for testing

What is LangChain?

LangChain is a framework for developing applications powered by language models. It provides tools and abstractions for building agents that can reason, use tools, and maintain conversation context.

Key features include:

Agent Framework: Build agents that can use tools and make decisions
MCP Integration: Connect to external services through Model Context Protocol adapters
Memory Management: Maintain conversation history across interactions
Multi-Provider Support: Works with OpenAI, Anthropic, and other LLM providers

What is the Hashnode MCP server, and what's possible with it?

The Hashnode MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Hashnode account. It provides structured and secure access to your blog and developer publication data, so your agent can fetch articles, manage publication invites, reply to comments, and explore tags or user details on your behalf.

Fetch and analyze articles: Let your agent retrieve single articles or lists of posts from your publications, making it easy to summarize, review, or manage your content.
Publication invite handling: Effortlessly accept publication invitations or view all your pending invites, streamlining the process of joining new developer teams or publications.
Interact with comments and replies: Have your agent add replies to existing comments, enabling automated engagement and conversation management on your posts.
Tag discovery and trend tracking: Easily fetch popular tags so your agent can suggest relevant topics, optimize your writing focus, or help you follow industry trends.
User and publication insights: Retrieve detailed profile information for any user or publication, giving your agent the context needed for personalized recommendations and content actions.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step10 STEPS

Prerequisites

Before starting this tutorial, make sure you have:

Python 3.10 or higher installed on your system
A Composio account with an API key
An OpenAI API key
Basic familiarity with Python and async programming

Getting API Keys for OpenAI and Composio

OpenAI API Key

Go to the OpenAI dashboard and create an API key. You'll need credits to use the models, or you can connect to another model provider.
Keep the API key safe.

Composio API Key

Log in to the Composio dashboard.
Navigate to your API settings and generate a new API key.
Store this key securely as you'll need it for authentication.

Install dependencies

npm install @composio/langchain @langchain/core @langchain/openai @langchain/mcp-adapters dotenv

Install the required packages for LangChain with MCP support.

What's happening:

@composio/langchain provides Composio integration for LangChain
@langchain/mcp-adapters enables MCP client connections
@langchain/core is the core agent framework
dotenv/config loads environment variables

Set up environment variables

bash

COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_composio_user_id_here
OPENAI_API_KEY=your_openai_api_key_here

Create a .env file in your project root.

What's happening:

COMPOSIO_API_KEY authenticates your requests to Composio's API
COMPOSIO_USER_ID identifies the user for session management
OPENAI_API_KEY enables access to OpenAI's language models

Import dependencies

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

dotenv.config();

What's happening:

We're importing LangChain's MCP adapter and Composio SDK
The dotenv/config import loads environment variables from your .env file
This setup prepares the foundation for connecting LangChain with Hashnode functionality through MCP

Initialize Composio client

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });

What's happening:

We're loading the COMPOSIO_API_KEY from environment variables and validating it exists
Creating a Composio instance that will manage our connection to Hashnode tools
Validating that COMPOSIO_USER_ID is also set before proceeding

Create a Tool Router session

const session = await composio.create(
    userId as string,
    {
        toolkits: ['hashnode']
    }
);

const url = session.mcp.url;

What's happening:

We're creating a Tool Router session that gives your agent access to Hashnode tools
The create method takes the user ID and specifies which toolkits should be available
The returned session.mcp.url is the MCP server URL that your agent will use
This approach allows the agent to dynamically load and use Hashnode tools as needed

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "hashnode-agent": {
        transport: "http",
        url: url,
        headers: {
            "x-api-key": process.env.COMPOSIO_API_KEY
        }
    }
});

const tools = await client.getTools();

const agent = createAgent({ model: "gpt-5", tools });

What's happening:

We're creating a MultiServerMCPClient that connects to our Hashnode MCP server via HTTP
The client is configured with a name and the URL from our Tool Router session
getTools() retrieves all available Hashnode tools that the agent can use
We're creating a LangChain agent using the GPT-5 model

Set up interactive chat interface

let conversationHistory: any[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
console.log("Ask any Hashnode related question or task to the agent.\n");

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: 'You: '
});

rl.prompt();

rl.on('line', async (userInput: string) => {
    const trimmedInput = userInput.trim();

    if (['exit', 'quit', 'bye'].includes(trimmedInput.toLowerCase())) {
        console.log("\nGoodbye!");
        rl.close();
        process.exit(0);
    }

    if (!trimmedInput) {
        rl.prompt();
        return;
    }

    conversationHistory.push({ role: "user", content: trimmedInput });
    console.log("\nAgent is thinking...\n");

    const response = await agent.invoke({ messages: conversationHistory });
    conversationHistory = response.messages;

    const finalResponse = response.messages[response.messages.length - 1]?.content;
    console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\n👋 Session ended.');
        process.exit(0);
    });

What's happening:

We initialize an empty conversationHistory list to maintain context across interactions
A readline interface is used to continuously accept user input from the command line
When a user types a message, it's added to the conversation history and sent to the agent
The agent processes the request using the invoke() method with the full conversation history
Users can type 'exit', 'quit', or 'bye' to end the chat session gracefully

Run the application

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});

What's happening:

We call the main() function to start the application

Complete Code

Here's the complete code to get you started with Hashnode and LangChain:

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";  
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });

    const session = await composio.create(
        userId as string,
        {
            toolkits: ['hashnode']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "hashnode-agent": {
            transport: "http",
            url: url,
            headers: {
                "x-api-key": process.env.COMPOSIO_API_KEY
            }
        }
    });
    
    const tools = await client.getTools();
  
    const agent = createAgent({ model: "gpt-5", tools });
    
    let conversationHistory: any[] = [];
    
    console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
    console.log("Ask any Hashnode related question or task to the agent.\n");
    
    const rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
        prompt: 'You: '
    });

    rl.prompt();

    rl.on('line', async (userInput: string) => {
        const trimmedInput = userInput.trim();
        
        if (['exit', 'quit', 'bye'].includes(trimmedInput.toLowerCase())) {
            console.log("\nGoodbye!");
            rl.close();
            process.exit(0);
        }
        
        if (!trimmedInput) {
            rl.prompt();
            return;
        }
        
        conversationHistory.push({ role: "user", content: trimmedInput });
        console.log("\nAgent is thinking...\n");
        
        const response = await agent.invoke({ messages: conversationHistory });
        conversationHistory = response.messages;
        
        const finalResponse = response.messages[response.messages.length - 1]?.content;
        console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\nSession ended.');
        process.exit(0);
    });
}

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});

Conclusion

You've successfully built a LangChain agent that can interact with Hashnode through Composio's Tool Router.

Key features of this implementation:

Dynamic tool loading through Composio's Tool Router
Conversation history maintenance for context-aware responses
Async Python provides clean, efficient execution of agent workflows

You can extend this further by adding error handling, implementing specific business logic, or integrating additional Composio toolkits to create multi-app workflows.

TOOLS

Supported Tools

Every Hashnode action and event your agent gets out of the box.

Hashnode Accept Publication Invite

Tool to accept a publication invitation.

Hashnode Add Comment

Add a comment to a Hashnode post.

Hashnode Add Content Block

Tool to add a content block to a Hashnode documentation project.

Hashnode Add Custom MDX Component

Tool to add a custom MDX component to a Hashnode documentation project.

Hashnode: Add Documentation Project Custom Domain

Tool to add a custom domain to a Hashnode documentation project.

Hashnode Add Reply

Tool to add a reply to an existing comment.

Hashnode: Check Custom Domain Availability

Tool to check if a custom domain is available for your Hashnode publication.

Hashnode: Check Subdomain Availability

Tool to check if a subdomain is available for a Hashnode publication.

Create Documentation API Reference

Tool to create a documentation API reference from an OpenAPI specification URL in a Hashnode project.

Create Documentation Link

Tool to create a link within a Hashnode documentation guide.

Hashnode: Create Documentation Project

Tool to create a new documentation project on Hashnode.

Hashnode Create Documentation Section

Tool to create a new documentation section in a Hashnode documentation guide.

Create Hashnode Documentation Guide

Tool to create a new documentation guide in a Hashnode documentation project.

Hashnode Delete Content Block

Tool to delete a content block from a Hashnode documentation project.

Hashnode Delete Custom MDX Component

Tool to delete a custom MDX component from a Hashnode documentation project.

Disable Documentation Project AI Search

Tool to disable AI search for a documentation project on Hashnode.

Hashnode: Fetch Invitations

Fetch pending publication invitations for a Hashnode publication.

Hashnode: Fetch Popular Tags

Tool to fetch a paginated list of popular tags.

Fetch Publication Posts

Tool to fetch a paginated list of posts from a publication.

Fetch Series Posts

Tool to fetch posts from a series within a publication.

Fetch Single Article

Tool to fetch a single article by slug from a publication.

Fetch Stories Feed

Fetch a paginated feed of stories from Hashnode.

Hashnode: Fetch User Details

Tool to fetch detailed user profile information by username.

Hashnode: Follow Tags

Follow specified tags to customize your content feed on Hashnode.

Generate Documentation Project Preview Authorization Token

Tool to generate a JWT authorization token for previewing a documentation project.

Get Documentation Project

Tool to fetch details of a Docs by Hashnode project by ID or hostname.

Get Post by ID

Tool to retrieve a published post by ID from Hashnode.

Get Publication by ID or Host

Tool to fetch publication details by ID or hostname.

Hashnode: Get Tag Details

Tool to fetch detailed information about a tag by its slug.

Hashnode Like Comment

Tool to like a comment on Hashnode.

Hashnode Like Post

Tool to like a post on Hashnode.

Hashnode: Like Reply

Tool to like a reply on Hashnode.

Hashnode: List Publications

Tool to list all publications of the authenticated user.

Hashnode: List Top Commenters

Tool to fetch users who have most actively participated in discussions by commenting in the last 7 days.

Hashnode: Map Documentation Project WWW Redirect

Tool to configure WWW redirect for a documentation project's custom domain.

Hashnode: Get Current User

Retrieves profile details of the currently authenticated Hashnode user.

Move Documentation Sidebar Item

Tool to reorder documentation sidebar items within a Hashnode guide.

Publish Documentation API Reference

Tool to publish a documentation API reference in a Hashnode documentation project.

Hashnode Publish Post

Tool to publish a new blog post to a Hashnode publication.

Hashnode Remove Comment

Tool to remove a comment from a Hashnode post.

Hashnode Remove Documentation Guide

Tool to remove a documentation guide from a Hashnode project.

Remove Documentation Project

Tool to remove a documentation project from Hashnode.

Hashnode Remove Documentation Project Custom Domain

Tool to remove a custom domain from a Hashnode documentation project.

Remove Documentation Sidebar Item

Tool to remove a sidebar item from a documentation guide on Hashnode.

Hashnode Remove Post

Tool to remove (delete) a post from Hashnode.

Hashnode Remove Reply

Tool to remove a reply from a comment.

Hashnode Rename Documentation Guide

Tool to rename a documentation guide in a Hashnode project.

Rename Documentation Sidebar Item

Tool to rename a documentation sidebar item within a Hashnode guide.

Hashnode Restore Post

Tool to restore a previously deleted Hashnode post.

Save Documentation Page Draft Content

Tool to save draft content for a documentation page in Hashnode.

Search Posts of Publication

Tool to search and retrieve posts from a specific publication based on a search query.

Subscribe to Newsletter

Tool to subscribe an email address to a Hashnode publication's newsletter.

Hashnode: Toggle Follow User

Tool to toggle follow status for a Hashnode user.

Hashnode: Unfollow Tags

Unfollow specified tags to customize your content feed on Hashnode.

Unsubscribe from Newsletter

Tool to unsubscribe an email address from a Hashnode publication's newsletter.

Hashnode Update Comment

Tool to update an existing comment on a Hashnode post.

Hashnode Update Content Block

Tool to update a content block in a Hashnode documentation project.

Update Documentation Appearance

Tool to update the appearance settings of a Hashnode documentation project.

Update Documentation General Settings

Tool to update general settings of a Hashnode documentation project.

Update Hashnode Documentation Guide

Tool to update an existing documentation guide in a Hashnode project.

Hashnode: Update Documentation Integrations

Tool to update third-party integrations for a Docs by Hashnode project.

Update Documentation Link

Tool to update an existing link within a Hashnode documentation guide.

Hashnode: Update Documentation Project Subdomain

Tool to update the subdomain of a Hashnode documentation project.

Hashnode Update Documentation Section

Tool to update a section in a Hashnode documentation guide.

Hashnode Update Post

Tool to update an existing Hashnode post via the updatePost mutation.

Hashnode Update Reply

Tool to update a reply.

Hashnode Verify Documentation Project Custom Domain

Tool to verify a custom domain for a Hashnode documentation project.

FRAMEWORKS

How to build Hashnode MCP Agent with another framework

OpenAI Agents SDK

Use Hashnode MCP with OpenAI Agents SDK

Claude Agent SDK

Use Hashnode MCP with Claude Agent SDK

Claude Code

Use Hashnode MCP with Claude Code

Claude Cowork

Use Hashnode MCP with Claude Cowork

Codex

Use Hashnode MCP with Codex

OpenClaw

Use Hashnode MCP with OpenClaw

Hermes

Use Hashnode MCP with Hermes

CLI

Use Hashnode MCP with CLI

Google ADK

Use Hashnode MCP with Google ADK

Vercel AI SDK

Use Hashnode MCP with Vercel AI SDK

Mastra AI

Use Hashnode MCP with Mastra AI

LlamaIndex

Use Hashnode MCP with LlamaIndex

CrewAI

Use Hashnode MCP with CrewAI

MORE TOOLKITS

Explore Other Toolkits

Toolkit marketplace

Supabase

Oauth2Api Key

Supabase is an open-source backend platform offering scalable Postgres databases, authentication, storage, and real-time APIs. It lets developers build modern apps without managing infrastructure.

Codeinterpreter

No Auth

Codeinterpreter is a Python-based coding environment with built-in data analysis and visualization. It lets you instantly run scripts, plot results, and prototype solutions inside supported platforms.

GitHub

Oauth2

GitHub is a code hosting platform for version control and collaborative software development. It streamlines project management, code review, and team workflows in one place.

Ably

Api Key

Ably is a real-time messaging platform for live chat and data sync in modern apps. It offers global scale and rock-solid reliability for seamless, instant experiences.

FAQ

Frequently asked questions

With a standalone Hashnode MCP server, the agents and LLMs can only access a fixed set of Hashnode tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Hashnode and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. LangChain fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Hashnode tools.

Yes, absolutely. You can configure which Hashnode scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Hashnode data and credentials are handled as safely as possible.

Start with Hashnode.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Hashnode tool your agent needs.Free to start.

Start building

Customer stories

Teams ship real agents on Composio

GET STARTED FOR FREE BOOK A DEMO

Karan skipped his own birthday party to fix our critical issue. It was 10pm and he diverted his Waymo to help us instead. This really sets the bar — it shows the commitment you need when users rely on your software.

Harsha Gaddipati

Co-founder, Slashy

A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

Abhi Arya

Co-founder, Opennote

We chose Composio over Pipedream because it delivered depth where it mattered — niche tools and tricky edge cases other platforms simply ignored. That gave us confidence to scale without compromising.

Nirman Dave

CEO, Zams

As a solo builder, shipping fast is life or death. The only way I can outcompete incumbents is by outmanoeuvring them. Getting bogged down managing agent auth would have been a death sentence.

Ryan Yu

Founder, Extra Thursday

Before Composio, adding tool integrations was slow and resource-intensive. Each one could take weeks of engineering time, and maintaining them meant constantly keeping up with API changes.

Tomisin Jenrola

Founder & CEO, SwarmZero

With hands-on help from their founder, we integrated Gmail and Google Drive in just 30 minutes. This level of personal support and commitment is exactly what startups should strive for.

Jerome Leclanche

Co-Founder, Ingram Technologies

How to integrate Hashnode MCP with LangChain

Connect Hashnode without auth hassles

Introduction

Also integrate Hashnode with

TL;DR

What is LangChain?

What is the Hashnode MCP server, and what's possible with it?

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

How the Composio SDK works

Step-by-step Guide

Prerequisites

Getting API Keys for OpenAI and Composio

Install dependencies

Set up environment variables

Import dependencies

Initialize Composio client

Create a Tool Router session

Configure the agent with the MCP URL

Set up interactive chat interface

Run the application

Complete Code

Conclusion

Supported Tools

How to build Hashnode MCP Agent with another framework

OpenAI Agents SDK

Claude Agent SDK

Claude Code

Claude Cowork

Codex

OpenClaw

Hermes

CLI

Google ADK

Vercel AI SDK

Mastra AI

LlamaIndex

CrewAI

Explore Other Toolkits

Supabase

Codeinterpreter

GitHub

Ably

Frequently asked questions

What are the differences in Tool Router MCP and Hashnode MCP?+

Can I use Tool Router MCP with LangChain?+

Can I manage the permissions and scopes for Hashnode while using Tool Router?+

How safe is my data with Composio Tool Router?+

Start with Hashnode.It takes 30 seconds.

Teams ship real agents on Composio