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How to integrate Nutshell MCP with Claude Agent SDK

Connect Claude Agent SDK to Nutshell MCP. List all open deals in the current pipeline, add a new contact with name and email, and more using natural language, with authentication handled for you.

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Nutshell logoNutshell
Basic

Nutshell is a flexible CRM and email marketing platform for small businesses. It helps manage contacts, sales pipelines, and customer relationships efficiently.

78 Tools

Introduction

This guide walks you through connecting Nutshell to the Claude Agent SDK using the Composio tool router. By the end, you'll have a working Nutshell agent that can list all open deals in the current pipeline, add a new contact with name and email, update the status of deal 'acme corp' to won through natural language commands.

This guide will help you understand how to give your Claude Agent SDK agent real control over a Nutshell account through Composio's Nutshell MCP server.

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

Also integrate Nutshell with

Claude CodeClaude CoworkOpenAI Agents SDKCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

TL;DR

Here's what you'll learn:
  • Get and set up your Claude/Anthropic and Composio API keys
  • Install the necessary dependencies
  • Initialize Composio and create a Tool Router session for Nutshell
  • Configure an AI agent that can use Nutshell as a tool
  • Run a live chat session where you can ask the agent to perform Nutshell operations

What is Claude Agent SDK?

The Claude Agent SDK is Anthropic's official framework for building AI agents powered by Claude. It provides a streamlined interface for creating agents with MCP tool support and conversation management.

Key features include:

  • Native MCP Support: Built-in support for Model Context Protocol servers
  • Permission Modes: Control tool execution permissions
  • Streaming Responses: Real-time response streaming for interactive applications
  • Context Manager: Clean async context management for sessions

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

The Nutshell MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Nutshell account. It provides structured and secure access to your accounts, contacts, leads, and sales records, so your agent can create accounts, add contacts, manage leads, retrieve customer details, and update sales information on your behalf.

  • Account creation and lookup: Have your agent create company accounts and retrieve existing account details when you need customer context.
  • Contact management: Let the agent add new contacts, review your contact list, retrieve specific contact details, and update existing records.
  • Lead creation: Direct your agent to create new leads in Nutshell as prospects enter your sales pipeline.
  • Lead review and updates: Instruct your agent to list leads, retrieve specific lead details, and update records as sales conversations progress.
  • Sales record maintenance: Have your agent keep account, contact, and lead information current as customer relationships develop.

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 step09 STEPS
1

Prerequisites

Before starting, make sure you have:
  • Composio API Key and Claude/Anthropic API Key
  • Primary know-how of Claude Agents SDK
  • A Nutshell account
  • Some knowledge of Python
2

Getting API Keys for Claude/Anthropic and Composio

Claude/Anthropic API Key
  • Go to the Anthropic Console and create an API key. You'll need credits to use the models.
  • 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 @anthropic-ai/claude-agent-sdk @composio/core dotenv

Install the Composio SDK and the Claude Agents SDK.

What's happening:

  • @composio/core provides Composio integration for Anthropic
  • @anthropic-ai/claude-agent-sdk is the core agent framework
  • dotenv/config loads environment variables
4

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
USER_ID=your_user_id_here
ANTHROPIC_API_KEY=your_anthropic_api_key_here

Create a .env file in your project root.

What's happening:

  • COMPOSIO_API_KEY authenticates with Composio
  • USER_ID identifies the user for session management
  • ANTHROPIC_API_KEY authenticates with Anthropic/Claude
5

Import dependencies

import 'dotenv/config';
import readline from 'node:readline';
import { Composio } from '@composio/core';
import { query, type Options } from "@anthropic-ai/claude-agent-sdk";

dotenv.config();
What's happening:
  • We're importing all necessary libraries including the Claude Agent SDK and Composio
  • The dotenv.config() function loads environment variables from your .env file
  • This setup prepares the foundation for connecting Claude with Nutshell functionality
6

Create a Composio instance and Tool Router session

async function chat() {
  const { COMPOSIO_API_KEY, USER_ID } = process.env;
  if (!COMPOSIO_API_KEY || !USER_ID) {
    throw new Error('COMPOSIO_API_KEY and USER_ID required in .env');
  }

  const composio = new Composio({ apiKey: COMPOSIO_API_KEY });

  // Create Tool Router session for Nutshell
  const session = await composio.create(USER_ID, {
    toolkits: ['nutshell'],
  });
  const mcpUrl = session?.mcp.url;
What's happening:
  • The function checks for the required COMPOSIO_API_KEY environment variable
  • We're creating a Composio instance using our API key
  • The create method creates a Tool Router session for Nutshell
  • The returned url is the MCP server URL that your agent will use
7

Configure Claude Agent with MCP

const options: Options = {
  permissionMode: 'bypassPermissions',
  mcpServers: {
    composio: {
      type: 'http',
      url: mcpUrl,
      headers: { 'x-api-key': COMPOSIO_API_KEY }
    }
  },
  systemPrompt: 'You are a helpful assistant with access to Nutshell tools via Composio.',
  maxTurns: 10,
};
What's happening:
  • We're configuring the Claude Agent options with the MCP server URL
  • permissionMode: 'bypassPermissions' allows the agent to execute operations without asking for permission each time
  • The system prompt instructs the agent that it has access to Nutshell
  • maxTurns: 10 limits the conversation length to prevent excessive API usage
8

Create client and start chat loop

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

  console.log('\nChat started. Type "exit" to quit.\n');

  let isProcessing = false;

  async function ask(prompt: string) {
    isProcessing = true;
    rl.pause();

    process.stdout.write('Claude is thinking...');
    const stream = query({ prompt, options });

    let firstChunk = true;
    for await (const msg of stream) {
      const content = (msg as any).message?.content || (msg as any).content;
      if (Array.isArray(content)) {
        for (const block of content) {
          if (block.type === 'text' && block.text) {
            if (firstChunk) {
              process.stdout.write('\r\x1b[K');
              process.stdout.write('Claude: ');
              firstChunk = false;
            }
            process.stdout.write(block.text);
          }
        }
      }
    }
    process.stdout.write('\n\n');

    isProcessing = false;
    rl.resume();
    rl.prompt();
  }

  rl.on('line', async (line) => {
    if (isProcessing) return;

    const input = line.trim();
    if (input === 'exit') {
      rl.close();
      process.exit(0);
    }
    if (input) await ask(input);
    else rl.prompt();
  });

  await ask('What can you help me with?');
}
What's happening:
  • The readline interface is created to handle user input and output
  • The query function is used to send the user's input to the agent
  • The chat loop continues until the user types 'exit' or 'quit'
9

Run the application

try {
  await chat();
} catch (error) {
  console.error(error);
  process.exit(1);
}
What's happening:
  • The chat function is the entry point for the application
  • The try-catch block is used to handle any errors that occur

Complete Code

Here's the complete code to get you started with Nutshell and Claude Agent SDK:

import 'dotenv/config';
import readline from 'node:readline';
import { Composio } from '@composio/core';
import { query, type Options } from "@anthropic-ai/claude-agent-sdk";

async function chat() {
  const { COMPOSIO_API_KEY, USER_ID } = process.env;
  if (!COMPOSIO_API_KEY || !USER_ID) {
    throw new Error('COMPOSIO_API_KEY and USER_ID required in .env');
  }

  const composio = new Composio({ apiKey: COMPOSIO_API_KEY });
  const session = await composio.create(USER_ID, {
    toolkits: ['nutshell']
  });
  const mcp_url = session?.mcp.url;

  const options: Options = {
    permissionMode: 'bypassPermissions',
    mcpServers: {
      composio: {
        type: 'http',
        url: mcp_url,
        headers: { 'x-api-key': COMPOSIO_API_KEY }
      }
    },
    systemPrompt: 'You are a helpful assistant with access to Nutshell tools via Composio.',
    maxTurns: 10,
  };

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

  console.log('\nChat started. Type "exit" to quit.\n');

  let isProcessing = false;

  async function ask(prompt: string) {
    isProcessing = true;
    rl.pause();

    process.stdout.write('Claude is thinking...');
    const stream = query({ prompt, options });

    let firstChunk = true;
    for await (const msg of stream) {
      const content = (msg as any).message?.content || (msg as any).content;
      if (Array.isArray(content)) {
        for (const block of content) {
          if (block.type === 'text' && block.text) {
            if (firstChunk) {
              process.stdout.write('\r\x1b[K');
              process.stdout.write('Claude: ');
              firstChunk = false;
            }
            process.stdout.write(block.text);
          }
        }
      }
    }
    process.stdout.write('\n\n');

    isProcessing = false;
    rl.resume();
    rl.prompt();
  }

  rl.on('line', async (line) => {
    if (isProcessing) return;

    const input = line.trim();
    if (input === 'exit') {
      rl.close();
      process.exit(0);
    }
    if (input) await ask(input);
    else rl.prompt();
  });

  await ask('What can you help me with?');
}

try {
  await chat();
} catch (error) {
  console.error(error);
  process.exit(1);
}

Conclusion

You've successfully built a Claude Agent SDK agent that can interact with Nutshell through Composio's Tool Router.

Key features:

  • Native MCP support through Claude's agent framework
  • Streaming responses for real-time interaction
  • Permission bypass for smooth automated workflows
You can extend this by adding more toolkits, implementing custom business logic, or building a web interface around the agent.
TOOLS

Supported Tools

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

Create Accounts

Tool to create one or more accounts in Nutshell.

Create Custom Field for Accounts

Tool to create a custom field for accounts in Nutshell.

Create Activities

Tool to create one or more activities in Nutshell CRM.

Create Contacts

Tool to create one or more contacts in Nutshell CRM.

Create Lead

Tool to create a lead in Nutshell CRM using the JSON-RPC API.

Create Custom Field for Leads

Tool to create a custom field for leads in Nutshell.

Create Notes

Tool to create a note in Nutshell.

Create Sources

Tool to create new sources in Nutshell CRM.

Create Tags

Tool to create one or more tags in Nutshell.

Delete Account

Tool to delete an account from Nutshell.

Delete Contact

Tool to delete a contact by ID.

Delete Lead

Tool to delete a lead from Nutshell CRM.

Delete Note

Tool to delete a note from Nutshell CRM.

Delete Product Map

Tool to delete a product on a lead.

Delete Task

Tool to delete a task from Nutshell CRM.

Edit Nutshell Account

Tool to edit an existing account in Nutshell CRM.

Get Account

Tool to retrieve an account from Nutshell.

Get Account Custom Fields

Tool to retrieve custom fields for a specific account in Nutshell.

Get Activity

Tool to retrieve a single activity by ID from Nutshell CRM.

Get Contact

Tool to retrieve a specific contact by ID from Nutshell CRM.

Get Contact Custom Fields

Tool to retrieve custom fields for a specific contact in Nutshell.

Get Lead

Tool to retrieve a specific lead by ID from Nutshell CRM.

Get Lead's Custom Fields

Tool to retrieve custom fields for a specific lead in Nutshell CRM.

Get Note

Tool to retrieve a single note by ID from Nutshell CRM.

Get Product Category

Tool to retrieve a single product category by ID from Nutshell CRM.

Get Task

Tool to retrieve a single task by ID from Nutshell CRM.

List Account Custom Field Attributes

Tool to retrieve all account custom field attributes from Nutshell CRM.

List Account Fields

Tool to retrieve all available fields for accounts in Nutshell.

List Accounts

Tool to retrieve list items for all accounts in Nutshell CRM.

List Account Types

Tool to retrieve a list of all account types from Nutshell CRM.

List Activities

Tool to retrieve a list of activities from Nutshell CRM.

List Activity Types

Tool to retrieve a list of all activity types from Nutshell CRM.

List Competitor Maps

Tool to get a list of lead-competitor relationships from Nutshell CRM.

List Competitors

Tool to get a list of competitors from Nutshell CRM.

List Contacts

Tool to get a list of contacts from Nutshell CRM.

List Contact Custom Field Attributes

Tool to retrieve all available custom field attributes for contacts in Nutshell.

List Contact Fields

Tool to retrieve all available fields for contacts in Nutshell.

List Contacts

Tool to retrieve list items for all contacts in Nutshell CRM.

List Deleted Events

Tool to get a feed of deletion events from Nutshell CRM.

List Editions

Tool to retrieve a list of all editions from Nutshell CRM.

List Events

Tool to get a list of events from Nutshell CRM.

List Filters

Tool to get saved filters from Nutshell CRM.

List Forms

Tool to get all forms from Nutshell.

List Industries

Tool to retrieve a list of all industries from Nutshell CRM.

List Invoices

Tool to get a list of invoices from Nutshell CRM.

List Leads

Tool to get a list of leads from Nutshell CRM.

List Lead Custom Field Attributes

Tool to retrieve all applicable custom field attributes for leads in Nutshell CRM.

List Lead Fields

Tool to retrieve all available fields for leads in Nutshell.

List Leads

Tool to retrieve list items for all leads in Nutshell CRM.

Get Leads Report

Tool to get reports for leads from Nutshell CRM.

List Lead Stages

Tool to retrieve all stages associated with a specific lead in Nutshell CRM.

List Markets

Tool to retrieve a list of all markets from Nutshell CRM.

List Notes

Tool to get a list of notes from Nutshell CRM.

List Lead Outcomes

Tool to retrieve a list of lead outcomes from Nutshell CRM.

List Product Categories

Tool to get a list of all product categories from Nutshell CRM.

List Product Maps

Tool to get a list of lead products from Nutshell CRM.

List Products

Tool to get a list of products from Nutshell CRM.

List Quotes

Tool to get a list of quotes from Nutshell CRM.

List Sources

Tool to retrieve a list of sources from Nutshell CRM.

List Stages

Tool to retrieve a list of all stages from Nutshell CRM.

List Pipelines

Tool to retrieve a list of all pipelines (stagesets) from Nutshell CRM.

List Tags

Tool to retrieve a list of tags from Nutshell CRM.

List Territories

Tool to retrieve a list of all territories from Nutshell CRM.

List Users

Tool to get a list of all users from Nutshell CRM.

Reopen Lead

Tool to reopen a lead in Nutshell CRM.

Set Lead Pipeline

Tool to set the pipeline (stageset) for a lead in Nutshell CRM.

Undelete Account

Tool to undelete a previously deleted account in Nutshell.

Undelete Contact

Tool to undelete a previously deleted contact in Nutshell CRM.

Undelete Lead

Tool to undelete a previously deleted lead from Nutshell CRM.

Undelete Note

Tool to undelete a previously deleted note in Nutshell CRM.

Undelete Source

Tool to undelete a source by ID.

Undelete Tag

Tool to undelete a previously deleted tag in Nutshell.

Update Account with JSON Patch

Tool to update an account in Nutshell using JSON Patch operations.

Update Nutshell Contact

Tool to update a contact using JSON Patch operations.

Update Lead

Tool to update a lead in Nutshell CRM using JSON Patch operations.

Update Lead Status

Tool to update the status of a lead in Nutshell CRM.

Update Task with JSON Patch

Tool to update a task in Nutshell using JSON Patch operations.

Watch Lead

Tool to watch a lead in Nutshell CRM.

FRAMEWORKS

How to build Nutshell MCP Agent with another framework

Claude Code logo

Claude Code

Use Nutshell MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Nutshell MCP with Claude Cowork

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Nutshell MCP with OpenAI Agents SDK

Codex logo

Codex

Use Nutshell MCP with Codex

OpenClaw logo

OpenClaw

Use Nutshell MCP with OpenClaw

Hermes logo

Hermes

Use Nutshell MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Nutshell MCP with Atomic Agent

Google ADK logo

Google ADK

Use Nutshell MCP with Google ADK

LangChain logo

LangChain

Use Nutshell MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Nutshell MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Nutshell MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Nutshell MCP with LlamaIndex

CrewAI logo

CrewAI

Use Nutshell MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Nutshell MCP with Pydantic AI

AutoGen logo

AutoGen

Use Nutshell MCP with AutoGen

FAQ

Frequently asked questions

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

Yes, you can. Claude Agent SDK 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 Nutshell tools.

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

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