# How to integrate Postgrid verify MCP with Claude Agent SDK

```json
{
  "title": "How to integrate Postgrid verify MCP with Claude Agent SDK",
  "toolkit": "Postgrid verify",
  "toolkit_slug": "postgrid_verify",
  "framework": "Claude Agent SDK",
  "framework_slug": "claude-agents-sdk",
  "url": "https://composio.dev/toolkits/postgrid_verify/framework/claude-agents-sdk",
  "markdown_url": "https://composio.dev/toolkits/postgrid_verify/framework/claude-agents-sdk.md",
  "updated_at": "2026-05-12T10:22:29.797Z"
}
```

## Introduction

This guide walks you through connecting Postgrid verify to the Claude Agent SDK using the Composio tool router. By the end, you'll have a working Postgrid verify agent that can verify a single us mailing address, standardize a batch of customer addresses, autocomplete address based on partial input through natural language commands.
This guide will help you understand how to give your Claude Agent SDK agent real control over a Postgrid verify account through Composio's Postgrid verify MCP server.
Before we dive in, let's take a quick look at the key ideas and tools involved.

## Also integrate Postgrid verify with

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

The Postgrid verify MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Postgrid verify account. It provides structured and secure access to address verification and standardization services, so your agent can autocomplete addresses, validate locations, perform batch verifications, and standardize address formats automatically on your behalf.
- Real-time address autocomplete: Instantly suggest and complete address fields as users type, reducing errors and speeding up data entry.
- Single address verification: Allow your agent to check and validate individual addresses for accuracy and deliverability in real time.
- Batch address verification: Process and validate multiple addresses at once, making bulk operations seamless and efficient.
- Address standardization: Automatically format and normalize addresses according to postal standards, ensuring consistency across your systems.
- Error detection and correction: Enable your agent to identify and fix common address entry mistakes, improving overall data quality.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `POSTGRID_VERIFY_AUTOCOMPLETE_ADDRESS` | Autocomplete Address | Tool to autocomplete a partially specified US or Canada address. Retrieves complete verified address including full postal code. Uses 1 lookup per request. |
| `POSTGRID_VERIFY_AUTOCOMPLETE_INTL_ADDRESS` | Autocomplete International Address | Tool to retrieve complete verified international address data using an ID from the preview endpoint. Use when you have an address ID from the preview step and need the full address details. |
| `POSTGRID_VERIFY_GET_AUTOCOMPLETE_PREVIEWS` | Get Autocomplete Previews | Tool to get previews of autocompleted US and Canadian addresses. Returns partial address data (line1, city, first 3 digits of postal code) without using any lookups. Use when you need quick autocomplete suggestions for address input. |
| `POSTGRID_VERIFY_GET_INTL_AUTOCOMPLETE_PREVIEWS` | Get International Autocomplete Previews | Tool to get previews of autocompleted international addresses. Results are biased based on your current IP address unless disabled. Returns both 'Address' and 'BuildingNumber' types - if type is 'Address', its id can be used in POST /completions; if 'BuildingNumber', use the container id with advanced previews. |
| `POSTGRID_VERIFY_GET_LOOKUP_INFO` | Get Lookup Info | Tool to retrieve lookup usage information for your PostGrid account. Use when you need to check how many lookups you have used and your free lookup limit. |
| `POSTGRID_VERIFY_LOOKUP_CITY_STATE_FROM_POSTAL` | Lookup City and State from Postal Code | Tool to lookup city and state for a given postal or ZIP code. Use when you need valid city/state combinations for a postal code. |
| `POSTGRID_VERIFY_PARSE_ADDRESS` | Parse Address | Tool to break an address apart into its components. Use when you need to extract individual address parts like street number, road, city, state, and postal code from a single-line address string. |
| `POSTGRID_VERIFY_SUGGEST_ADDRESSES` | Suggest Addresses | Tool to find addresses similar to the given address. If the address can be verified or corrected, the first element will contain the verified address. Returns unit number ranges in line1 of suggested addresses. Use when you need address suggestions or corrections for US or Canadian addresses. |
| `POSTGRID_VERIFY_VERIFY_ADDRESS` | Verify Address | Tool to verify and standardize a US or Canadian address. Supports both freeform addresses (single-line) and structured addresses (with separate line1, city, etc.). Use includeDetails=true for additional metadata or geocode=true for latitude/longitude. |
| `POSTGRID_VERIFY_VERIFY_BATCH_ADDRESSES` | Batch Verify Addresses with Mixed Format | Tool to verify up to 2000 US and Canada addresses in a single API call. Accepts both freeform address strings and structured address objects. Each address uses 1 lookup credit. |
| `POSTGRID_VERIFY_VERIFY_INTERNATIONAL_ADDRESS` | Verify International Address | Tool to verify and standardize international addresses from 245+ countries. Supports both structured and freeform address inputs. Use includeDetails=true for match levels and geoData=true for coordinates. |
| `POSTGRID_VERIFY_VERIFY_INTL_ADDRESSES_BATCH` | Batch Verify International Addresses | Tool to verify up to 2000 international addresses in a single API call. Accepts both freeform address strings and structured address objects. Uses 1 lookup per address. |

## Supported Triggers

None listed.

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

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

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

    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 Postgrid verify 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: ['postgrid_verify']
  });
  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 Postgrid verify 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 Postgrid verify 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 Postgrid verify MCP Agent with another framework

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

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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 Postgrid verify MCP?

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

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

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

---
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