# How to integrate Mailsoftly MCP with Claude Agent SDK

```json
{
  "title": "How to integrate Mailsoftly MCP with Claude Agent SDK",
  "toolkit": "Mailsoftly",
  "toolkit_slug": "mailsoftly",
  "framework": "Claude Agent SDK",
  "framework_slug": "claude-agents-sdk",
  "url": "https://composio.dev/toolkits/mailsoftly/framework/claude-agents-sdk",
  "markdown_url": "https://composio.dev/toolkits/mailsoftly/framework/claude-agents-sdk.md",
  "updated_at": "2026-05-12T10:18:23.464Z"
}
```

## Introduction

This guide walks you through connecting Mailsoftly to the Claude Agent SDK using the Composio tool router. By the end, you'll have a working Mailsoftly agent that can verify if your mailsoftly api key is valid, check our company profile details on mailsoftly, confirm mailsoftly account credentials before sending campaign through natural language commands.
This guide will help you understand how to give your Claude Agent SDK agent real control over a Mailsoftly account through Composio's Mailsoftly MCP server.
Before we dive in, let's take a quick look at the key ideas and tools involved.

## Also integrate Mailsoftly with

- [OpenAI Agents SDK](https://composio.dev/toolkits/mailsoftly/framework/open-ai-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/mailsoftly/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/mailsoftly/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/mailsoftly/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/mailsoftly/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/mailsoftly/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/mailsoftly/framework/cli)
- [Google ADK](https://composio.dev/toolkits/mailsoftly/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/mailsoftly/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/mailsoftly/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/mailsoftly/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/mailsoftly/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/mailsoftly/framework/crew-ai)

## 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 Mailsoftly
- Configure an AI agent that can use Mailsoftly as a tool
- Run a live chat session where you can ask the agent to perform Mailsoftly 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 Mailsoftly MCP server, and what's possible with it?

The Mailsoftly MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Mailsoftly account. It provides structured and secure access to your email marketing platform, so your agent can validate credentials, access firm information, and streamline campaign setup for you.
- API key authentication validation: Have your agent confirm your API key is working and securely connected before taking further actions.
- Retrieve firm details: Instantly pull details about your Mailsoftly organization to verify account information or tailor campaign strategies.
- Credential troubleshooting automation: Let your agent proactively diagnose and report authentication issues, making onboarding and integration smoother.
- Foundational checks for workflow automation: Use the agent to verify Mailsoftly connection status as the first step in building automated campaign flows.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `MAILSOFTLY_ADD_CONTACT_TO_CONTACT_LIST` | Add Contact to Contact List | Tool to add an existing contact to a specific contact list. Use when you need to add a contact to a contact list in Mailsoftly. |
| `MAILSOFTLY_ADD_CUSTOM_FIELD_TO_CONTACT` | Add Custom Field to Contact | Tool to add a custom field value to an existing contact. Use when you need to store additional custom data on a contact record. |
| `MAILSOFTLY_ASSIGN_TAGS_TO_CONTACT` | Assign Tags to Contact | Tool to assign multiple tags to an existing contact at once. Skips tags if they are already assigned to the contact. Use when you need to categorize or label a contact with one or more tags in Mailsoftly. |
| `MAILSOFTLY_AUTHENTICATE_FIRM` | Authenticate Firm | Tool to validate the API key and retrieve firm details. Use when confirming credentials before making other Mailsoftly API calls. |
| `MAILSOFTLY_CREATE_CONTACT` | Create Contact | Tool to create a new contact for the authenticated firm with email, first name, and last name. Use when adding new contacts to the firm's contact list. |
| `MAILSOFTLY_CREATE_CONTACT_LIST` | Create Contact List | Tool to create a new contact list for the authenticated firm. Use when organizing contacts into separate lists for targeted campaigns. |
| `MAILSOFTLY_CREATE_EMAILS` | Create Email Drafts | Tool to create one or more email drafts in Mailsoftly. Use when drafting emails for campaigns or communications. If contact_list_id is not provided, the system automatically creates a contact list from the provided recipients. |
| `MAILSOFTLY_CREATE_OR_UPDATE_CONTACT` | Create or Update Contact | Tool to create a new contact or update an existing contact in Mailsoftly. Use when you need to add a new contact to the system or update an existing contact's information. If contact_id is provided, the existing contact will be updated; otherwise, a new contact will be created. |
| `MAILSOFTLY_GET_CONTACT` | Get Contact | Tool to retrieve a specific contact by ID from Mailsoftly. Use when you need to fetch details about a specific contact. You can choose between basic or detailed view using the type parameter. |
| `MAILSOFTLY_GET_CONTACT_FIELDS` | Get Contact Fields | Tool to fetch all contact fields available for a firm, excluding hidden columns. Use when you need to retrieve the list of available contact field names and their data types. |
| `MAILSOFTLY_GET_CONTACT_LIST` | Get Contact List | Tool to retrieve details of a specific contact list by ID. Use when you need to fetch information about a contact list including its name and contact count. |
| `MAILSOFTLY_GET_CONTACT_LIST_CONTACTS` | Get Contact List Contacts | Tool to retrieve all contacts within a specific contact list. Use when you need to fetch the members of a particular contact list. |
| `MAILSOFTLY_GET_CONTACT_LISTS` | Get Contact Lists | Tool to retrieve all contact lists for the authenticated firm. Use when you need to view all available contact lists and their details. |
| `MAILSOFTLY_GET_CONTACTS` | Get Contacts | Tool to retrieve all contacts associated with a firm. Use when you need to fetch the complete list of contacts from Mailsoftly. |
| `MAILSOFTLY_GET_CUSTOM_FIELDS` | Get Custom Fields | Tool to retrieve all custom fields defined for the authenticated firm. Use when you need to understand what custom field options are available for contacts in Mailsoftly. |
| `MAILSOFTLY_GET_EMAIL_STATUS` | Get Email Status | Tool to fetch the status of a specific email draft by its ID. Use when checking if a draft is ready to send or to get its current status. |
| `MAILSOFTLY_GET_TAGS` | Get Tags | Tool to retrieve all tags associated with the authenticated firm. Use when you need to list available tags for organizing contacts or campaigns. |
| `MAILSOFTLY_SEARCH_CONTACTS` | Search Contacts | Tool to search for contacts matching specified criteria in Mailsoftly. Use when you need to find contacts by email, first name, or last name. At least one search parameter should be provided for meaningful results. |
| `MAILSOFTLY_SEND_EMAIL` | Send Email | Tool to send an existing email draft that is marked as ready. Use when you need to send a prepared email draft via Mailsoftly. |
| `MAILSOFTLY_UPDATE_CONTACT` | Update Contact | Tool to update an existing contact's information in Mailsoftly. Use when you need to modify contact details such as name or email address. |

## Supported Triggers

None listed.

## Creating MCP Server - Stand-alone vs Composio SDK

The Mailsoftly MCP server is an implementation of the Model Context Protocol that connects your AI agent to Mailsoftly. It provides structured and secure access so your agent can perform Mailsoftly operations on your behalf through a secure, permission-based interface.
With Composio's managed implementation, you don't have to create your own developer app. For production, if you're building an end product, we recommend using your own credentials. The managed server helps you prototype fast and go from 0-1 faster.

## Step-by-step Guide

### 1. Prerequisites

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

### 1. Getting API Keys for Claude/Anthropic and Composio

Claude/Anthropic API Key
- Go to the [Anthropic Console](https://console.anthropic.com/settings/organization/api-keys) 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](https://dashboard.composio.dev?utm_source=toolkits&utm_medium=framework_docs).
- Navigate to your API settings and generate a new API key.
- Store this key securely as you'll need it for authentication.

### 2. Install dependencies

No description provided.
```python
pip install composio-anthropic claude-agent-sdk python-dotenv
```

```typescript
npm install @anthropic-ai/claude-agent-sdk @composio/core dotenv
```

### 3. Set up environment variables

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
```bash
COMPOSIO_API_KEY=your_composio_api_key_here
USER_ID=your_user_id_here
ANTHROPIC_API_KEY=your_anthropic_api_key_here
```

### 4. Import dependencies

No description provided.
```python
import asyncio
from claude_agent_sdk import ClaudeSDKClient, ClaudeAgentOptions
import os
from composio import Composio
from dotenv import load_dotenv

load_dotenv()
```

```typescript
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();
```

### 5. Create a Composio instance and Tool Router session

No description provided.
```python
async def chat_with_remote_mcp():
    api_key = os.getenv("COMPOSIO_API_KEY")
    if not api_key:
        raise RuntimeError("COMPOSIO_API_KEY is not set")

    composio = Composio(api_key=api_key)

    # Create Tool Router session for Mailsoftly
    mcp_server = composio.create(
        user_id=os.getenv("USER_ID"),
        toolkits=["mailsoftly"]
    )

    url = mcp_server.mcp.url

    if not url:
        raise ValueError("Session URL not found")
```

```typescript
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 Mailsoftly
  const session = await composio.create(USER_ID, {
    toolkits: ['mailsoftly'],
  });
  const mcpUrl = session?.mcp.url;
```

### 6. Configure Claude Agent with MCP

No description provided.
```python
# Configure remote MCP server for Claude
options = ClaudeAgentOptions(
    permission_mode="bypassPermissions",
    mcp_servers={
        "composio": {
            "type": "http",
            "url": url,
            "headers": {
                "x-api-key": os.getenv("COMPOSIO_API_KEY")
            }
        }
    },
    system_prompt="You are a helpful assistant with access to Mailsoftly tools via Composio.",
    max_turns=10
)
```

```typescript
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 Mailsoftly tools via Composio.',
  maxTurns: 10,
};
```

### 7. Create client and start chat loop

No description provided.
```python
# Create client with context manager
async with ClaudeSDKClient(options=options) as client:
    print("\nChat started. Type 'exit' or 'quit' to end.\n")

    # Main chat loop
    while True:
        user_input = input("You: ").strip()
        if user_input.lower() in {"exit", "quit"}:
            print("Goodbye!")
            break

        # Send query
        await client.query(user_input)

        # Receive and print response
        print("Claude: ", end="", flush=True)
        async for message in client.receive_response():
            if hasattr(message, "content"):
                for block in message.content:
                    if hasattr(block, "text"):
                        print(block.text, end="", flush=True)
        print()
```

```typescript
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?');
}
```

### 8. Run the application

No description provided.
```python
if __name__ == "__main__":
    asyncio.run(chat_with_remote_mcp())
```

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

## Complete Code

```python
import asyncio
from claude_agent_sdk import ClaudeSDKClient, ClaudeAgentOptions
import os
from composio import Composio
from dotenv import load_dotenv

load_dotenv()

async def chat_with_remote_mcp():
    api_key = os.getenv("COMPOSIO_API_KEY")
    if not api_key:
        raise RuntimeError("COMPOSIO_API_KEY is not set")

    composio = Composio(api_key=api_key)

    # Create Tool Router session for Mailsoftly
    mcp_server = composio.create(
        user_id=os.getenv("USER_ID"),
        toolkits=["mailsoftly"]
    )

    url = mcp_server.mcp.url

    if not url:
        raise ValueError("Session URL not found")

    # Configure remote MCP server for Claude
    options = ClaudeAgentOptions(
        permission_mode="bypassPermissions",
        mcp_servers={
            "composio": {
                "type": "http",
                "url": url,
                "headers": {
                    "x-api-key": os.getenv("COMPOSIO_API_KEY")
                }
            }
        },
        system_prompt="You are a helpful assistant with access to Mailsoftly tools via Composio.",
        max_turns=10
    )

    # Create client with context manager
    async with ClaudeSDKClient(options=options) as client:
        print("\nChat started. Type 'exit' or 'quit' to end.\n")

        # Main chat loop
        while True:
            user_input = input("You: ").strip()
            if user_input.lower() in {"exit", "quit"}:
                print("Goodbye!")
                break

            # Send query
            await client.query(user_input)

            # Receive and print response
            print("Claude: ", end="", flush=True)
            async for message in client.receive_response():
                if hasattr(message, "content"):
                    for block in message.content:
                        if hasattr(block, "text"):
                            print(block.text, end="", flush=True)
            print()

if __name__ == "__main__":
    asyncio.run(chat_with_remote_mcp())
```

```typescript
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: ['mailsoftly']
  });
  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 Mailsoftly 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 Mailsoftly 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.

## How to build Mailsoftly MCP Agent with another framework

- [OpenAI Agents SDK](https://composio.dev/toolkits/mailsoftly/framework/open-ai-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/mailsoftly/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/mailsoftly/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/mailsoftly/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/mailsoftly/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/mailsoftly/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/mailsoftly/framework/cli)
- [Google ADK](https://composio.dev/toolkits/mailsoftly/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/mailsoftly/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/mailsoftly/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/mailsoftly/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/mailsoftly/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/mailsoftly/framework/crew-ai)

## Related Toolkits

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- [Linkedin](https://composio.dev/toolkits/linkedin) - LinkedIn is a professional networking platform for connecting, sharing content, and engaging with business opportunities. It's the go-to place for building your professional brand and unlocking new career connections.
- [Active campaign](https://composio.dev/toolkits/active_campaign) - ActiveCampaign is a marketing automation and CRM platform for managing email campaigns, sales pipelines, and customer segmentation. It helps businesses engage customers and drive growth through smart automation and targeted outreach.
- [ActiveTrail](https://composio.dev/toolkits/active_trail) - ActiveTrail is a user-friendly email marketing and automation platform. It helps you reach subscribers and automate campaigns with ease.
- [Ahrefs](https://composio.dev/toolkits/ahrefs) - Ahrefs is an SEO and marketing platform for site audits, keyword research, and competitor insights. It helps you improve search rankings and drive organic traffic.
- [Amcards](https://composio.dev/toolkits/amcards) - AMCards lets you create and mail personalized greeting cards online. Build stronger customer relationships with easy, automated card campaigns.
- [Beamer](https://composio.dev/toolkits/beamer) - Beamer is a news and changelog platform for in-app announcements and feature updates. It helps companies boost user engagement by sharing news where users are most active.
- [Benchmark email](https://composio.dev/toolkits/benchmark_email) - Benchmark Email is a platform for creating, sending, and tracking email campaigns. It's built to help you engage audiences and analyze results—all in one place.
- [Bigmailer](https://composio.dev/toolkits/bigmailer) - BigMailer is an email marketing platform for managing multiple brands with white-labeling and automation. It helps teams streamline campaigns and simplify integration with Amazon SES.
- [Brandfetch](https://composio.dev/toolkits/brandfetch) - Brandfetch is an API that delivers company logos, colors, and visual branding assets. It helps marketers and developers keep brand visuals consistent everywhere.
- [Brevo](https://composio.dev/toolkits/brevo) - Brevo is an all-in-one email and SMS marketing platform for transactional messaging, automation, and CRM. It helps businesses engage customers and streamline communications through powerful campaign tools.
- [Campayn](https://composio.dev/toolkits/campayn) - Campayn is an email marketing platform for creating, sending, and managing campaigns. It helps businesses engage contacts and grow audiences with easy-to-use tools.
- [Cardly](https://composio.dev/toolkits/cardly) - Cardly is a platform for creating and sending personalized direct mail to customers. It helps businesses break through the digital clutter by getting real engagement via physical mailboxes.
- [ClickSend](https://composio.dev/toolkits/clicksend) - ClickSend is a cloud-based SMS and email marketing platform for businesses. It streamlines communication by enabling quick message delivery and contact management.
- [Crustdata](https://composio.dev/toolkits/crustdata) - CrustData is an AI-powered data intelligence platform for real-time company and people data. It helps B2B sales teams, AI SDRs, and investors react to live business signals.
- [Curated](https://composio.dev/toolkits/curated) - Curated is a platform for collecting, curating, and publishing newsletters. It streamlines content aggregation and distribution for creators and teams.
- [Customerio](https://composio.dev/toolkits/customerio) - Customer.io is a customer engagement platform for targeted messaging across email, SMS, and push. Easily automate, segment, and track communications with your audience.
- [Cutt ly](https://composio.dev/toolkits/cutt_ly) - Cutt.ly is a URL shortening service for managing and analyzing links. Streamline your workflows with quick, trackable, and branded short URLs.
- [Demio](https://composio.dev/toolkits/demio) - Demio is webinar software built for marketers, offering both live and automated sessions with interactive features. It helps teams engage audiences and optimize lead generation through detailed analytics.

## Frequently Asked Questions

### What are the differences in Tool Router MCP and Mailsoftly MCP?

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

### Can I use Tool Router MCP with Claude Agent SDK?

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 Mailsoftly tools.

### Can I manage the permissions and scopes for Mailsoftly while using Tool Router?

Yes, absolutely. You can configure which Mailsoftly 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.

### How safe is my data with Composio Tool Router?

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 Mailsoftly data and credentials are handled as safely as possible.

---
[See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)