# PureChecker

```json
{
  "name": "PureChecker",
  "slug": "purechecker",
  "url": "https://composio.dev/toolkits/purechecker",
  "markdown_url": "https://composio.dev/toolkits/purechecker.md",
  "logo_url": "https://logos.composio.dev/api/purechecker",
  "categories": [
    "developer tools & devops"
  ],
  "is_composio_managed": false,
  "updated_at": "2026-08-30T05:37:36.973Z"
}
```

![PureChecker logo](https://logos.composio.dev/api/purechecker)

## Description

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with PureChecker MCP or direct API to verify single emails, batch-validate lists, check domain and MX records, and flag disposable or high-risk addresses through natural language.

## Summary

PureChecker verifies individual or batched email addresses for syntax, domain, deliverability, disposability, and risk signals.
Use it to boost deliverability, remove risky/disposable addresses, and reduce bounce rates.

## Categories

- developer tools & devops

## Toolkit Details

- Tools: 2

## Images

- Logo: https://logos.composio.dev/api/purechecker

## Authentication

- **Api Key**
  - Type: `api_key`
  - Description: Api Key authentication for PureChecker.
  - Setup:
    - Configure Api Key credentials for PureChecker.
    - Use the credentials when creating an auth config in Composio.

## Suggested Prompts

- Verify deliverability for these customer emails
- Check if signup emails are disposable
- Batch validate newsletter signup emails

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `PURECHECKER_CHECK_EMAIL` | Check Email | Check one email address and return PureChecker's detailed syntax, domain, mailbox, disposability, and risk signals. |
| `PURECHECKER_CHECK_EMAILS` | Check Emails | Check a batch of email addresses in one request and return PureChecker's verification signals for each address. |

## Supported Triggers

None listed.

## Installation and MCP Setup

### Path 1: SDK Installation

#### Path 1, Step 1: Install Composio

Install the Composio SDK
```python
pip install composio_openai
```

```typescript
npm install @composio/openai
```

#### Path 1, Step 2: Initialize Composio and Create Tool Router Session

Import and initialize Composio client, then create a Tool Router session
```python
from openai import OpenAI
from composio import Composio
from composio_openai import OpenAIResponsesProvider

composio = Composio(provider=OpenAIResponsesProvider())
openai = OpenAI()
session = composio.create(user_id='your-user-id')
```

```typescript
import OpenAI from 'openai';
import { Composio } from '@composio/core';
import { OpenAIResponsesProvider } from '@composio/openai';

const composio = new Composio({
  provider: new OpenAIResponsesProvider(),
});
const openai = new OpenAI({});
const session = await composio.create('your-user-id');
```

#### Path 1, Step 3: Execute PureChecker Tools via Tool Router with Your Agent

Get tools from Tool Router session and execute PureChecker actions with your Agent
```python
tools = session.tools
response = openai.responses.create(
  model='gpt-4.1',
  tools=tools,
  input=[{
    'role': 'user',
    'content': 'Verify deliverability and disposable status for: alice@example.com, bob@disposablemail.com'
  }]
)
result = composio.provider.handle_tool_calls(
  response=response,
  user_id='your-user-id'
)
print(result)
```

```typescript
const tools = session.tools;
const response = await openai.responses.create({
  model: 'gpt-4.1',
  tools: tools,
  input: [{
    role: 'user',
    content: 'Verify deliverability and disposable status for: alice@example.com, bob@disposablemail.com'
  }],
});
const result = await composio.provider.handleToolCalls(
  'your-user-id',
  response.output
);
console.log(result);
```

### Path 2: MCP Server Setup

#### Path 2, Step 1: Install Composio

Install the Composio SDK for Python or TypeScript
```python
pip install composio claude-agent-sdk
```

```typescript
npm install @composio/core ai @ai-sdk/openai @ai-sdk/mcp
```

#### Path 2, Step 2: Initialize Client and Create Tool Router Session

Import and initialize the Composio client, then create a Tool Router session for PureChecker
```python
from composio import Composio
from claude_agent_sdk import ClaudeSDKClient, ClaudeAgentOptions

composio = Composio(api_key='your-composio-api-key')
session = composio.create(user_id='your-user-id')
url = session.mcp.url
```

```typescript
import { Composio } from '@composio/core';

const composio = new Composio({ apiKey: 'your-api-key' });
const session = await composio.create('your-user-id');
console.log(`Tool Router session created: ${session.mcp.url}`);
```

#### Path 2, Step 3: Connect to AI Agent

Use the MCP server with your AI agent (Anthropic Claude or Mastra)
```python
import asyncio

options = ClaudeAgentOptions(
    permission_mode='bypassPermissions',
    mcp_servers={
        'tool_router': {
            'type': 'http',
            'url': url,
            'headers': {
                'x-api-key': 'your-composio-api-key'
            }
        }
    },
    system_prompt='You are a helpful assistant with access to PureChecker tools.',
    max_turns=10
)

async def main():
    async with ClaudeSDKClient(options=options) as client:
        await client.query('Batch-validate these emails and list invalid or disposable ones: alice@example.com, bob@disposablemail.com, carol@gmail.com')
        async for message in client.receive_response():
            if hasattr(message, 'content'):
                for block in message.content:
                    if hasattr(block, 'text'):
                        print(block.text)

asyncio.run(main())
```

```typescript
import { openai } from '@ai-sdk/openai';
import { experimental_createMCPClient as createMCPClient } from '@ai-sdk/mcp';
import { generateText } from 'ai';

const client = await createMCPClient({
  transport: {
    type: 'http',
    url: session.mcp.url,
    headers: {
      'x-api-key': 'your-composio-api-key',
    },
  },
});

const tools = await client.tools();
const { text } = await generateText({
  model: openai('gpt-4o'),
  tools,
  messages: [{
    role: 'user',
    content: 'Batch-validate these emails and list invalid or disposable ones: alice@example.com, bob@disposablemail.com, carol@gmail.com'
  }],
  maxSteps: 5,
});

console.log(`Agent: ${text}`);
```

## Why Use Composio?

### 1. AI Native PureChecker Integration

- Supports both PureChecker MCP and direct API based integrations
- Structured, LLM-friendly schemas for reliable tool execution
- Rich coverage for reading, writing, and querying your PureChecker data

### 2. Managed Auth

- Built-in OAuth handling with automatic token refresh and rotation
- Central place to manage, scope, and revoke PureChecker access
- Per user and per environment credentials instead of hard-coded keys

### 3. Agent Optimized Design

- Tools are tuned using real error and success rates to improve reliability over time
- Comprehensive execution logs so you always know what ran, when, and on whose behalf

### 4. Enterprise Grade Security

- Fine-grained RBAC so you control which agents and users can access PureChecker
- Scoped, least privilege access to PureChecker resources
- Full audit trail of agent actions to support review and compliance

## Use PureChecker with any AI Agent Framework

Choose a framework you want to connect PureChecker with:

- [ChatGPT Work](https://composio.dev/toolkits/purechecker/framework/chatgpt)
- [Claude Cowork](https://composio.dev/toolkits/purechecker/framework/claude-cowork)
- [Hermes](https://composio.dev/toolkits/purechecker/framework/hermes-agent)

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## Frequently Asked Questions

### Do I need my own developer credentials to use PureChecker with Composio?

Yes — PureChecker requires you to configure your own API key credentials. Once set up, Composio handles secure credential storage and API request handling for you.

### Can I use multiple toolkits together?

Yes! Composio's Tool Router enables agents to use multiple toolkits. [Learn more](https://docs.composio.dev/tool-router/overview).

### Is Composio secure?

Composio is SOC 2 and ISO 27001 compliant with all data encrypted in transit and at rest. [Learn more](https://trust.composio.dev).

### What if the API changes?

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

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