How to integrate PocketSmith MCP with LangChain

This guide walks you through connecting PocketSmith to LangChain using the Composio tool router. By the end, you'll have a working PocketSmith agent that can track your transactions, review your budgets, summarize spending, manage categories, and update accounts through natural language commands. This guide will help you understand how to give your LangChain agent real control over a PocketSmith account through Composio's PocketSmith MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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PocketSmith is a personal finance platform for accounts, transactions, budgets, and cash-flow forecasts. Use it to understand spending, plan ahead, and make better money decisions.

14 Tools

Introduction

This guide walks you through connecting PocketSmith to LangChain using the Composio tool router. By the end, you'll have a working PocketSmith agent that can track your transactions, review your budgets, summarize spending, manage categories, and update accounts through natural language commands.

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

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

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

The PocketSmith MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your PocketSmith account. It provides structured and secure access to your accounts, transactions, categories, and budgets, so your agent can review spending, record transactions, organize finances, update account details, and analyze budgets on your behalf.

  • Account and balance overview: Have your agent list your financial and transaction accounts, check their balances, and gather the details needed to manage your finances.
  • Transaction tracking and updates: Let the agent find transactions by date, state, type, or keyword, review individual records, create new transactions, and update existing ones.
  • Spending categorization: Direct your agent to list, create, and update categories, including category hierarchy and budgeting behavior.
  • Budget analysis: Instruct your agent to review current category-level actual and forecast budgets or summarize income and expenses across a chosen date range and interval.
  • Account organization: Have your agent update selected details on your financial accounts while leaving balances and transactions unchanged.

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 PocketSmith 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 PocketSmith 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: ['pocketsmith']
    }
);

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

Configure the agent with the MCP URL

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

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

Create Category

Create one category for a PocketSmith user with optional hierarchy and budgeting behavior.

Create Transaction

Create one transaction in a specified transaction account and return the created financial record.

Get Budget

Return a PocketSmith user's current category-level actual and forecast budget analysis.

Get Budget Summary

Analyze the user's combined income and expense budget over a required date range and period interval.

Get Current User

Return the PocketSmith user authorized by the connected developer key, including the user ID needed by user-scoped tools.

Get Transaction

Return one PocketSmith transaction by ID with its amount, date, payee, category, labels, and review state.

List Accounts

Return all financial accounts belonging to a PocketSmith user, including account, primary transaction-account, and scenario IDs.

List Categories

Return all categories belonging to a PocketSmith user, including hierarchy and budgeting flags.

List Transaction Accounts

Return the transaction accounts belonging to a PocketSmith user, including IDs and balances needed to create and query transactions.

List Transactions

Return one page of a user's transactions with optional date, state, type, and keyword filters, plus a cursor for the next page.

Update Account

Update selected metadata on one financial account without deleting it or changing transaction-account balances.

Update Category

Update selected hierarchy, display, and budgeting fields on one category without deleting it.

Update Transaction

Update selected fields on one existing transaction without deleting or splitting it.

Update Transactions

Update 1-20 distinct transactions sequentially.

FRAMEWORKS

How to build PocketSmith MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use PocketSmith MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use PocketSmith MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use PocketSmith MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use PocketSmith MCP with Claude Cowork

Codex logo

Codex

Use PocketSmith MCP with Codex

OpenClaw logo

OpenClaw

Use PocketSmith MCP with OpenClaw

Hermes logo

Hermes

Use PocketSmith MCP with Hermes

CLI logo

CLI

Use PocketSmith MCP with CLI

Google ADK logo

Google ADK

Use PocketSmith MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use PocketSmith MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use PocketSmith MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use PocketSmith MCP with LlamaIndex

CrewAI logo

CrewAI

Use PocketSmith MCP with CrewAI

FAQ

Frequently asked questions

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

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

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