# How to integrate Realphonevalidation MCP with Claude Agent SDK

```json
{
  "title": "How to integrate Realphonevalidation MCP with Claude Agent SDK",
  "toolkit": "Realphonevalidation",
  "toolkit_slug": "realphonevalidation",
  "framework": "Claude Agent SDK",
  "framework_slug": "claude-agents-sdk",
  "url": "https://composio.dev/toolkits/realphonevalidation/framework/claude-agents-sdk",
  "markdown_url": "https://composio.dev/toolkits/realphonevalidation/framework/claude-agents-sdk.md",
  "updated_at": "2026-05-12T10:23:28.074Z"
}
```

## Introduction

This guide walks you through connecting Realphonevalidation to the Claude Agent SDK using the Composio tool router. By the end, you'll have a working Realphonevalidation agent that can check if this phone number is active, validate if a number is wireless or landline, verify if this email address is disposable through natural language commands.
This guide will help you understand how to give your Claude Agent SDK agent real control over a Realphonevalidation account through Composio's Realphonevalidation MCP server.
Before we dive in, let's take a quick look at the key ideas and tools involved.

## Also integrate Realphonevalidation with

- [OpenAI Agents SDK](https://composio.dev/toolkits/realphonevalidation/framework/open-ai-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/realphonevalidation/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/realphonevalidation/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/realphonevalidation/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/realphonevalidation/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/realphonevalidation/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/realphonevalidation/framework/cli)
- [Google ADK](https://composio.dev/toolkits/realphonevalidation/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/realphonevalidation/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/realphonevalidation/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/realphonevalidation/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/realphonevalidation/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/realphonevalidation/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 Realphonevalidation
- Configure an AI agent that can use Realphonevalidation as a tool
- Run a live chat session where you can ask the agent to perform Realphonevalidation 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 Realphonevalidation MCP server, and what's possible with it?

The Realphonevalidation MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Realphonevalidation account. It provides structured and secure access to advanced phone number and email verification services, so your agent can perform actions like real-time phone validation, carrier checks, bulk number scrubbing, and email deliverability checks on your behalf.
- Instant phone number validation: Let your agent verify if a phone number is active, its type (mobile or landline), carrier, and caller details in real time.
- Bulk number scrubbing: Automatically process and validate large lists of phone numbers, checking for connectivity and type to ensure data accuracy at scale.
- Email address verification: Have your agent check if an email is deliverable and not disposable, helping prevent bouncebacks and spam risks.
- Reassigned and consent compliance checks: Enable your agent to determine if a number has been reassigned since a specific consent date for regulatory compliance.
- Carrier and wireless identification: Easily identify whether a US phone number is wireless or landline for TCPA compliance and segmentation.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `REALPHONEVALIDATION_CHECK_FRAUD` | Check Phone Fraud Risk | Tool to check phone number for fraud risk using Fraud Check API. Provides a phone risk score and many actionable data points including phone type, carrier, location, and recommendation (block, flag, allow). Use when you need to identify possible fraudulent phone numbers. US numbers only. |
| `REALPHONEVALIDATION_EMAIL_VERIFY` | Email Verification | Tool to validate an email address and check connectivity and disposability. Use after gathering an email to ensure it's deliverable and not disposable. |
| `REALPHONEVALIDATION_LOOKUP_DNC` | DNC Lookup | Tool to check Do Not Call list status for US phone numbers. Determines if number is on National, State, or DMA Do Not Call lists, identifies cell vs landline, and checks for known TCPA litigators. Requires SAN number from FTC. |
| `REALPHONEVALIDATION_RPV_ACTIVE` | Check Phone Active Status | Tool to determine if a phone number is active on a valid phone service provider. Use after collecting the user's phone number for real-time verification. |
| `REALPHONEVALIDATION_RPV_REASSIGNED_NUMBER_LOOKUP` | Reassigned Number Lookup | Tool to check if a phone number has been reassigned since a given consent date. Use when verifying number ownership status after obtaining user consent. |
| `REALPHONEVALIDATION_RPV_SCRUB_PLUS` | Scrub Plus Phone Numbers | Tool to scrub a phone number for connection status and type. Use to validate a US phone number's status and line type. |
| `REALPHONEVALIDATION_RPV_WIRELESS_ID` | Wireless ID | Tool to identify whether a US phone number is landline or wireless. Use when conducting TCPA compliance checks. |
| `REALPHONEVALIDATION_VALIDATE_PHONE_SCRUB` | Validate Phone Number (Scrub) | Tool to validate US phone numbers using budget-friendly Scrub API. Determines connectivity status quickly (under 2 seconds). Best for organizations with large lists/databases on tight budgets that only need connection status. Optional Iscell and Carrier fields available for additional charge. |
| `REALPHONEVALIDATION_VALIDATE_PHONE_TURBO_STANDARD` | Validate Phone Turbo Standard | Tool to perform real-time US phone validation using Turbo Standard API. Provides connection status and phone type (Mobile, Landline, VoIP). Optimized for web forms and apps when only connection status and phone type are needed. Faster than Turbo V3 when only basic validation is required. Returns results in about 2 seconds. |
| `REALPHONEVALIDATION_VALIDATE_PHONE_TURBO_V3` | Validate Phone Turbo V3 | Tool to perform comprehensive real-time phone validation using Turbo V3 API. Returns connection status, phone type (landline, cell, VoIP), carrier ID, caller name (when available), and caller type (consumer, business). Use when complete phone data overview is required in web forms. US numbers only. |

## Supported Triggers

None listed.

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

The Realphonevalidation MCP server is an implementation of the Model Context Protocol that connects your AI agent to Realphonevalidation. It provides structured and secure access so your agent can perform Realphonevalidation 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 Realphonevalidation 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 Realphonevalidation
    mcp_server = composio.create(
        user_id=os.getenv("USER_ID"),
        toolkits=["realphonevalidation"]
    )

    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 Realphonevalidation
  const session = await composio.create(USER_ID, {
    toolkits: ['realphonevalidation'],
  });
  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 Realphonevalidation 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 Realphonevalidation 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 Realphonevalidation
    mcp_server = composio.create(
        user_id=os.getenv("USER_ID"),
        toolkits=["realphonevalidation"]
    )

    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 Realphonevalidation 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: ['realphonevalidation']
  });
  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 Realphonevalidation 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 Realphonevalidation 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 Realphonevalidation MCP Agent with another framework

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

## Related Toolkits

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- [Addressfinder](https://composio.dev/toolkits/addressfinder) - Addressfinder is a data quality platform for verifying addresses, emails, and phone numbers. It helps you ensure accurate customer and contact data every time.
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- [Anonyflow](https://composio.dev/toolkits/anonyflow) - Anonyflow is a service for encryption-based data anonymization and secure data sharing. It helps organizations meet GDPR, CCPA, and HIPAA data privacy compliance requirements.
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- [Api sports](https://composio.dev/toolkits/api_sports) - Api sports is a comprehensive sports data platform covering 2,000+ competitions with live scores and 15+ years of stats. Instantly access up-to-date sports information for analysis, apps, or chatbots.
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- [Autom](https://composio.dev/toolkits/autom) - Autom is a lightning-fast search engine results data platform for Google, Bing, and Brave. Developers use it to access fresh, low-latency SERP data on demand.
- [Beaconchain](https://composio.dev/toolkits/beaconchain) - Beaconchain is a real-time analytics platform for Ethereum 2.0's Beacon Chain. It provides detailed insights into validators, blocks, and overall network performance.
- [Big data cloud](https://composio.dev/toolkits/big_data_cloud) - BigDataCloud provides APIs for geolocation, reverse geocoding, and address validation. Instantly access reliable location intelligence to enhance your applications and workflows.
- [Bigpicture io](https://composio.dev/toolkits/bigpicture_io) - BigPicture.io offers APIs for accessing detailed company and profile data. Instantly enrich your applications with up-to-date insights on 20M+ businesses.
- [Bitquery](https://composio.dev/toolkits/bitquery) - Bitquery is a blockchain data platform offering indexed, real-time, and historical data from 40+ blockchains via GraphQL APIs. Get unified, reliable access to complex on-chain data for analytics, trading, and research.
- [Brightdata](https://composio.dev/toolkits/brightdata) - Brightdata is a leading web data platform offering advanced scraping, SERP APIs, and anti-bot tools. It lets you collect public web data at scale, bypassing blocks and friction.
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- [Byteforms](https://composio.dev/toolkits/byteforms) - Byteforms is an all-in-one platform for creating forms, managing submissions, and integrating data. It streamlines workflows by centralizing form data collection and automation.
- [Cabinpanda](https://composio.dev/toolkits/cabinpanda) - Cabinpanda is a data collection platform for building and managing online forms. It helps streamline how you gather, organize, and analyze responses.

## Frequently Asked Questions

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

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

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

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

---
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