# Lob

```json
{
  "name": "Lob",
  "slug": "lob",
  "url": "https://composio.dev/toolkits/lob",
  "markdown_url": "https://composio.dev/toolkits/lob.md",
  "logo_url": "https://logos.composio.dev/api/lob",
  "categories": [
    "productivity & project management"
  ],
  "is_composio_managed": false,
  "updated_at": "2026-03-29T06:40:52.638Z"
}
```

![Lob logo](https://logos.composio.dev/api/lob)

## Description

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Lob MCP or direct API to send letters, validate addresses, track mail, and manage templates through natural language.

## Summary

Lob is a direct mail automation and address verification platform for businesses. It streamlines sending physical mail and validating addresses at scale with a simple API.

## Categories

- productivity & project management

## Toolkit Details

- Tools: 13

## Images

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

## Authentication

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

## Suggested Prompts

- Send a postcard to a verified address
- Validate this list of mailing addresses
- Track delivery status for recent letters

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `LOB_CREATE_DOMAIN` | Create Domain | Tool to add a new custom domain for creating custom links. Use when you need to register a domain for short link customization. |
| `LOB_CREATE_LINK` | Create Link | Tool to create a shortened URL from a long URL using Lob's link shortening service. Use when you need to shorten a long URL either by using a custom domain or Lob's own short domain. |
| `LOB_DELETE_DOMAIN` | Delete Domain | Tool to delete a registered domain. Use only after confirming all associated links with the domain are deleted. |
| `LOB_DELETE_LINK` | Delete Link | Tool to delete a shortened link. Use when you need to remove a previously created short link from the system. |
| `LOB_DELETE_UPLOAD` | Delete Upload | Tool to delete an existing upload by its unique identifier. Use when you need to permanently remove an upload and its associated data. |
| `LOB_GET_DOMAIN` | Get Domain | Tool to retrieve details for a single domain from Lob. Use when you need to get configuration status, redirect links, or other metadata for a specific domain. |
| `LOB_GET_LINK` | Get Link | Tool to retrieve a single shortened link. Use when you need to fetch details about a specific link by its ID. |
| `LOB_LIST_DOMAINS` | List Domains | Tool to retrieve a list of all created domains. Use when you need to view or manage custom domains configured for URL shortening. Supports pagination and filtering by configuration status. |
| `LOB_LIST_SHORTENED_LINKS` | List Shortened Links | Tool to retrieve a list of shortened links. The list is sorted by creation date, with the most recently created appearing first. Use when you need to view all links or filter by campaign or domain. |
| `LOB_LIST_QR_CODE_ANALYTICS` | List QR Code Analytics | Tool to retrieve a list of your QR codes and their analytics data. The QR codes are returned sorted by scan date, with the most recently scanned QR codes appearing first. |
| `LOB_LIST_UPLOADS` | List Uploads | Tool to list uploads from Lob. Use when you need to retrieve all uploads or filter uploads by campaign ID. |
| `LOB_UPDATE_LINK` | Update Link | Tool to update any properties of a shortened link. Use when you need to modify the redirect URL, title, or metadata of an existing Lob shortened link. Requires the link_id and at least the redirect_link to update. |
| `LOB_VALIDATE_IDENTITY` | Validate Identity | Tool to validate whether a given name is associated with an address. Use when you need to verify identity information by checking if a recipient name matches address records. |

## 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 Lob Tools via Tool Router with Your Agent

Get tools from Tool Router session and execute Lob actions with your Agent
```python
tools = session.tools
response = openai.responses.create(
  model='gpt-4.1',
  tools=tools,
  input=[{
    'role': 'user',
    'content': 'Send a letter to 123 Main St, New York, NY with the attached PDF.'
  }]
)
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: 'Send a letter to 123 Main St, New York, NY with the attached PDF.'
  }],
});
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 Lob
```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 Lob tools.',
    max_turns=10
)

async def main():
    async with ClaudeSDKClient(options=options) as client:
        await client.query('Track delivery status for letter sent to 456 Oak Ave, Austin, TX')
        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: 'Track delivery status for letter sent to 456 Oak Ave, Austin, TX'
  }],
  maxSteps: 5,
});

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

## Why Use Composio?

### 1. AI Native Lob Integration

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

### 2. Managed Auth

- Built-in OAuth handling with automatic token refresh and rotation
- Central place to manage, scope, and revoke Lob 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 Lob
- Scoped, least privilege access to Lob resources
- Full audit trail of agent actions to support review and compliance

## Use Lob with any AI Agent Framework

Choose a framework you want to connect Lob with:

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

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## Frequently Asked Questions

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

Yes, Lob 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)