How to integrate DevCycle MCP with LangChain

This guide walks you through connecting DevCycle to LangChain using the Composio tool router. By the end, you'll have a working DevCycle agent that can list active flags in production, create checkout rollout feature flag, summarize recent devcycle flag changes through natural language commands. This guide will help you understand how to give your LangChain agent real control over a DevCycle account through Composio's DevCycle MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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DevCycle is a feature management platform for feature flags, targeting, releases, and monitoring. It helps teams ship safely with controlled rollouts, experiments, and fast rollback.

9 Tools

Introduction

This guide walks you through connecting DevCycle to LangChain using the Composio tool router. By the end, you'll have a working DevCycle agent that can list active flags in production, create checkout rollout feature flag, summarize recent devcycle flag changes through natural language commands.

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

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

Also integrate DevCycle 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 DevCycle project to Composio
  • Create a Tool Router MCP session for DevCycle
  • Initialize an MCP client and retrieve DevCycle tools
  • Build a LangChain agent that can interact with DevCycle
  • 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 DevCycle MCP server, and what's possible with it?

The DevCycle MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your DevCycle account. It provides structured and secure access to your projects, features, environments, audiences, configurations, and variables, so your agent can list projects, inspect feature configurations, search audiences, review environments, and manage variables on your behalf.

  • Project and feature discovery: Have your agent list available DevCycle projects and filter their current features to find the work that matters.
  • Feature configuration review: Let the agent inspect a feature's targeting configurations across every environment or within one selected environment.
  • Environment and audience lookup: Direct your agent to list project environments, search audiences, and check whether each audience is in use.
  • Variable discovery: Instruct your agent to list and filter project variables, including those associated with a specific feature.
  • Variable management: Have your agent create typed variables, update their editable properties, or permanently delete a selected variable.

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 DevCycle 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 DevCycle 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: ['dev_cycle']
    }
);

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

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "dev_cycle-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 DevCycle MCP server via HTTP
  • The client is configured with a name and the URL from our Tool Router session
  • getTools() retrieves all available DevCycle 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 DevCycle 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 DevCycle 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: ['dev_cycle']
        }
    );

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

Create Variable

Create a typed variable in a DevCycle project, optionally associating it with a feature.

Delete Variable

Permanently delete exactly one DevCycle variable, selected by key or stable ID, from the specified project.

List Audiences

List and search project audiences, optionally including whether each audience is used.

List Environments

List environments in a DevCycle project without exposing SDK key values.

List Feature Configurations

Inspect a feature's targeting configurations across all environments or one selected environment.

List Features

List and filter current Feature v2 resources in a DevCycle project.

List Projects

List DevCycle projects visible to the connected Management service account, with filtering and controlled pagination.

List Variables

List and filter variables in a DevCycle project, including variables associated with a feature.

Update Variable

Update one or more editable properties of an existing DevCycle variable.

FRAMEWORKS

How to build DevCycle MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use DevCycle MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use DevCycle MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use DevCycle MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use DevCycle MCP with Claude Cowork

Codex logo

Codex

Use DevCycle MCP with Codex

OpenClaw logo

OpenClaw

Use DevCycle MCP with OpenClaw

Hermes logo

Hermes

Use DevCycle MCP with Hermes

CLI logo

CLI

Use DevCycle MCP with CLI

Google ADK logo

Google ADK

Use DevCycle MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use DevCycle MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use DevCycle MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use DevCycle MCP with LlamaIndex

CrewAI logo

CrewAI

Use DevCycle MCP with CrewAI

FAQ

Frequently asked questions

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

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

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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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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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