How to integrate Reddit Ads MCP with LangChain

This guide walks you through connecting Reddit Ads to LangChain using the Composio tool router. By the end, you'll have a working Reddit Ads agent that can summarize active reddit campaigns by spend, create conversion report for last week, pause underperforming reddit ad groups through natural language commands. This guide will help you understand how to give your LangChain agent real control over a Reddit Ads account through Composio's Reddit Ads MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Reddit Ads is Reddit's advertising platform for running paid campaigns, managing ad accounts, and tracking conversions. It helps advertisers reach high-intent communities with targeted, interest-based campaigns.

83 Tools

Introduction

This guide walks you through connecting Reddit Ads to LangChain using the Composio tool router. By the end, you'll have a working Reddit Ads agent that can summarize active reddit campaigns by spend, create conversion report for last week, pause underperforming reddit ad groups through natural language commands.

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

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

Also integrate Reddit Ads with

OpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenClawHermesCLIGoogle ADKVercel AI SDKMastra AILlamaIndexCrewAI

TL;DR

Here's what you'll learn:
  • Get and set up your OpenAI and Composio API keys
  • Connect your Reddit Ads project to Composio
  • Create a Tool Router MCP session for Reddit Ads
  • Initialize an MCP client and retrieve Reddit Ads tools
  • Build a LangChain agent that can interact with Reddit Ads
  • 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 Reddit Ads MCP server, and what's possible with it?

The Reddit Ads MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Reddit Ads account. It provides structured and secure access to your campaigns, audiences, performance data, conversion activity, and product catalogs, so your agent can review account details, monitor campaigns, generate reports, research targeting options, and check conversion activity on your behalf.

  • Campaign and account oversight: Have your agent review your Reddit Ads businesses, ad accounts, campaigns, ad groups, funding instruments, and lead generation forms.
  • Advertising performance reports: Direct your agent to generate metrics reports with selected fields and breakdowns to assess how your ads are performing.
  • Audience and targeting research: Let the agent explore interests, communities, locations, devices, carriers, saved audiences, and custom audiences, validate locations, and estimate campaign reach.
  • Conversion activity checks: Instruct your agent to check when app events or conversion pixels last fired and review SKAdNetwork availability for iOS apps.
  • Catalog and creative review: Have your agent inspect product catalogs, feeds, product sets, products, profiles, and recent promoted or organic Reddit posts.

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:

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

Step-by-step Guide

Step by step10 STEPS
1

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
2

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.
3

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
4

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
5

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 Reddit Ads functionality through MCP
6

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 Reddit Ads tools
  • Validating that COMPOSIO_USER_ID is also set before proceeding
7

Create a Tool Router session

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

const url = session.mcp.url;
What's happening:
  • We're creating a Tool Router session that gives your agent access to Reddit Ads 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 Reddit Ads tools as needed
8

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "reddit_ads-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 Reddit Ads MCP server via HTTP
  • The client is configured with a name and the URL from our Tool Router session
  • getTools() retrieves all available Reddit Ads tools that the agent can use
  • We're creating a LangChain agent using the GPT-5 model
9

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 Reddit Ads 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
10

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 Reddit Ads 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: ['reddit_ads']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "reddit_ads-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 Reddit Ads 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 Reddit Ads 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 Reddit Ads action and event your agent gets out of the box.

Create Ad Group

Tool to create a new ad group within a Reddit Ads campaign.

Create Batch Products

Tool to create or update multiple products in a catalog in a single batch operation.

Create Reddit Ads Campaign

Tool to create a new Reddit Ads campaign for the specified ad account.

Create Custom Audience

Tool to create a new Custom Audience in Reddit Ads.

Create Lead Gen Form

Tool to create a new lead generation form in Reddit Ads.

Create Reddit Post

Tool to create a new Reddit post for a specified profile.

Create Product Catalog

Tool to create a new product catalog.

Create Product Feed

Tool to create a new feed for a product catalog.

Create Product Set

Tool to create a new product set in a product catalog.

Create Saved Audience

Tool to create a saved audience for a Reddit Ads ad account with targeting criteria.

Create Structured Post Creation Job

Tool to create a structured post creation job on Reddit Ads.

Delete Custom Audience

Tool to delete a Custom Audience by ID from Reddit Ads.

Delete Product Catalog

Tool to delete a product catalog by ID from Reddit Ads.

Delete Product Feed

Tool to delete a feed in a catalog by ID from Reddit Ads.

Batch Delete Products

Tool to delete multiple products from a Reddit Ads product catalog in a single request.

Delete Product Set

Tool to delete a product set by ID from Reddit Ads.

Validate Geolocations

Tool to validate a list of geolocations for use in Reddit Ads targeting.

Do Keyword Validations

Tool to validate a list of keywords for targeting and check their brand safety status.

Generate Inspiration Creative Summary

Tool to get AI-generated summary of best practices followed by an inspiration creative ad.

Get Ad Account by ID

Tool to retrieve details for a specific Reddit ad account by ID.

Get ad account history

Get changelog history for a Reddit ad account with filtering options.

Get Ad Group

Tool to get an ad group by its ID from Reddit Ads API.

Get App Last Fired At Report

Tool to retrieve the last time mobile conversion events were fired for a specific app ID.

Get A Report

Tool to generate a metrics report for ad performance based on specified fields and breakdowns.

Get Business by ID

Tool to get business details by ID from the Reddit Ads API.

Get Campaign by ID

Retrieve a specific Reddit Ads campaign by its ID.

Get Channel Planning Reach

Tool to retrieve estimated reach data for a given set of targeting parameters.

Get Child Funding Instruments

Tool to retrieve a list of Funding Instrument Allocations for a parent funding instrument.

Get Custom Audience

Tool to retrieve a custom audience by ID from Reddit Ads API.

Get Lead Gen Form by ID

Tool to retrieve details for a specific lead generation form by ID from Reddit Ads.

Get Authenticated Member

Tool to get the authenticated member's information from the Reddit Ads API.

Get Pixel Last Fired At Report

Tool to retrieve the last time conversion events were fired for a specific conversion pixel.

Get Post by ID

Tool to retrieve a promoted or organic Reddit post by its ID.

Get Product Catalog

Tool to retrieve a specific product catalog by ID from the Reddit Ads API.

Get Product Feed

Tool to retrieve metadata for a specific product feed by ID.

Get Product Set

Tool to retrieve metadata for a specific product set by ID from the Reddit Ads API.

Get Profile by ID

Tool to retrieve details for a specific profile by ID from the Reddit Ads API.

Get Saved Audience

Tool to retrieve a saved audience by ID from Reddit Ads API.

Get SKAdNetwork Availability

Tool to get SKAdNetwork IDs availability quota for an iOS app.

Get Structured Post by ID

Tool to retrieve a structured post by its ID from the Reddit Ads API.

List 3rd Party Audiences

Tool to retrieve all available 3rd party audiences from Reddit Ads API for targeting purposes.

List Ad Accounts By Business

Tool to get a list of ad accounts under a business on Reddit Ads.

List Ad Groups

Tool to list ad groups for a Reddit ad account.

List Ads

Tool to list ads by ad account on Reddit Ads platform.

List Campaigns

Tool to list campaigns by ad account with pagination support.

List Carriers

Tool to retrieve all available carriers from Reddit Ads API for targeting purposes.

List Catalog Imports

Tool to retrieve all imports for a catalog.

List Communities

Tool to list targetable communities matched by their names.

List Communities Suggestions

Tool to fetch suggested communities for given community names from Reddit Ads API.

List Devices

Tool to retrieve all available devices from Reddit Ads API for targeting purposes.

List Funding Instruments

Tool to list funding instruments (payment methods) for a Reddit Ads ad account.

List Geolocations

Tool to fetch a list of geolocations from Reddit Ads API.

List Industries

Tool to retrieve all available industries from Reddit Ads API.

List Interests

Tool to retrieve all available interests from Reddit Ads API for targeting purposes.

List Lead Gen Forms

Tool to list lead generation forms for a Reddit Ads ad account.

List My Businesses

Tool to retrieve details of businesses associated with the provided access token.

List Pixels By Ad Account

Tool to list pixels by ad account.

List Pixels by Business

Tool to list all pixels associated with a specific business.

List Posts by Profile

Tool to list up to 1,000 of the most recent posts for a specified profile.

List Product Catalogs

Tool to retrieve details for all product catalogs belonging to a business.

List Product Feeds

Tool to retrieve metadata for all feeds in a product catalog.

List Product Sets

Tool to retrieve all product sets in a catalog.

List Products In Product Catalog

Tool to retrieve all products in a Reddit Ads product catalog.

List Products In Product Set

Tool to retrieve all products in a Reddit Ads product set.

List Profiles By Ad Account

Tool to list profiles by ad account from Reddit Ads API.

List Profiles By Business

Tool to list profiles by business.

List Saved Audiences

Tool to list saved audiences for a Reddit ad account.

List Structured Posts

Tool to list structured posts for a profile or retrieve up to 10 specific structured posts by ID.

List Time Zones

Tool to retrieve all available time zones from Reddit Ads API for campaign scheduling.

List User Custom Audiences

Tool to list all Custom Audiences under an ad account.

Query Ad Accounts

Tool to query ad accounts by business with optional filtering by actors, assets, roles, or custom filter string.

Query funding instruments by business

Query funding instruments (credit lines) by business with pagination support.

Search Communities

Tool to search for Reddit communities based on their name or topic.

Update Ad Account

Tool to update a Reddit ad account configuration.

Update Business

Tool to update a business by ID in Reddit Ads.

Update Campaign

Tool to update a campaign by ID in Reddit Ads.

Update Custom Audience Users

Tool to update users in a Reddit Ads Custom Audience by adding or removing user identifiers.

Update Post

Tool to update a Reddit post by ID.

Update Product Catalog

Tool to update a product catalog's name or attached Pixel IDs in Reddit Ads.

Update Product Feed

Tool to update a product feed's metadata in Reddit Ads.

Update Product Set

Tool to update a product set's name and filter rules in Reddit Ads.

Update Saved Audience

Tool to update a saved audience by ID in Reddit Ads.

Update Structured Post

Tool to update a structured post by ID.

FRAMEWORKS

How to build Reddit Ads MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Reddit Ads MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Reddit Ads MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Reddit Ads MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Reddit Ads MCP with Claude Cowork

Codex logo

Codex

Use Reddit Ads MCP with Codex

OpenClaw logo

OpenClaw

Use Reddit Ads MCP with OpenClaw

Hermes logo

Hermes

Use Reddit Ads MCP with Hermes

CLI logo

CLI

Use Reddit Ads MCP with CLI

Google ADK logo

Google ADK

Use Reddit Ads MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use Reddit Ads MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Reddit Ads MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Reddit Ads MCP with LlamaIndex

CrewAI logo

CrewAI

Use Reddit Ads MCP with CrewAI

FAQ

Frequently asked questions

With a standalone Reddit Ads MCP server, the agents and LLMs can only access a fixed set of Reddit Ads tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Reddit Ads 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 Reddit Ads tools.

Yes, absolutely. You can configure which Reddit Ads 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 Reddit Ads data and credentials are handled as safely as possible.

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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.

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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.

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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.

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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.

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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.

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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.

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