How to integrate ClickSend MCP with LlamaIndex

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Introduction

This guide walks you through connecting ClickSend to LlamaIndex using the Composio tool router. By the end, you'll have a working ClickSend agent that can send sms campaign to all event attendees, add a new contact to clicksend list, retrieve delivery status for my last sms through natural language commands.

This guide will help you understand how to give your LlamaIndex agent real control over a ClickSend account through Composio's ClickSend MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

TL;DR

Here's what you'll learn:
  • Set your OpenAI and Composio API keys
  • Install LlamaIndex and Composio packages
  • Create a Composio Tool Router session for ClickSend
  • Connect LlamaIndex to the ClickSend MCP server
  • Build a ClickSend-powered agent using LlamaIndex
  • Interact with ClickSend through natural language

What is LlamaIndex?

LlamaIndex is a data framework for building LLM applications. It provides tools for connecting LLMs to external data sources and services through agents and tools.

Key features include:

  • ReAct Agent: Reasoning and acting pattern for tool-using agents
  • MCP Tools: Native support for Model Context Protocol
  • Context Management: Maintain conversation context across interactions
  • Async Support: Built for async/await patterns

What is the ClickSend MCP server, and what's possible with it?

The ClickSend MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your ClickSend account. It provides structured and secure access so your agent can perform ClickSend operations on your behalf.

Supported Tools & Triggers

Tools
Get Account Usage by SubaccountTool to retrieve account usage statistics by subaccount for a specific month and year.
Send Account Activation TokenTool to send an account activation token for verification.
Verify New AccountTool to verify a new ClickSend account using an activation token.
Calculate Post Letter PriceTool to calculate the price for sending post letters without actually sending them.
Calculate SMS Campaign PriceTool to calculate the price for an SMS campaign before sending.
Create Email Delivery Receipt AutomationTool to create an email delivery receipt automation rule in ClickSend.
Create Inbound Fax AutomationTool to create a new inbound fax automation rule in ClickSend.
Create Fax Delivery Receipt AutomationTool to create a fax delivery receipt automation rule in ClickSend.
Create Inbound SMS AutomationTool to create a new inbound SMS automation rule in ClickSend.
Create SMS Delivery Receipt AutomationTool to create an SMS delivery receipt automation rule in ClickSend.
Create Voice Delivery Receipt AutomationTool to create a voice delivery receipt automation rule in ClickSend.
Create Delivery IssueTool to create a delivery issue report in ClickSend.
Create Allowed Email AddressTool to create an allowed email address for sending transactional emails.
Get Allowed Email AddressesTool to retrieve list of allowed email addresses for sending transactional emails.
Create Email Template from MasterTool to create a new email template from an existing master template.
Add Fax Delivery Receipt WebhookTool to add a webhook URL for fax delivery receipt notifications.
Create Contact ListTool to create a new contact list in your ClickSend account.
Create Contact in ListTool to create a new contact in a specific contact list in your ClickSend account.
Send MMS MessagesTool to send MMS messages with media attachments to recipients.
Send Direct Mail CampaignTool to create and send a direct mail campaign to specified locations.
Detect Address from PDF or StringTool to detect and convert addresses to standard format from PDF or address string.
Send Post LetterTool to send physical letters through ClickSend's postal service.
Create Post Return AddressTool to create a new post return address for ClickSend postal services.
Get All Post Return AddressesTool to retrieve a list of all post return addresses from ClickSend account with pagination.
Create and Send SMS CampaignTool to create and send an SMS campaign to a contact list.
Create Email-to-SMS Allowed AddressTool to create an allowed email address for email-to-SMS conversion.
Get SMS Email-to-SMS Allowed AddressTool to retrieve a specific allowed email address for SMS email-to-SMS by its ID.
Update Email-to-SMS Allowed AddressTool to update a specific allowed email address for email-to-SMS.
Delete SMS Email-to-SMS Allowed AddressTool to delete a specific allowed email address from SMS email-to-SMS settings.
Create Email to SMS Stripped String RuleTool to create an email to SMS stripped string rule.
Create Test Inbound SMSTool to create a test inbound SMS webhook configuration in ClickSend.
Add SMS Delivery Receipt WebhookTool to add a test SMS delivery receipt webhook in ClickSend.
Send SMS MessagesTool to send one or more SMS messages via ClickSend.
Create SMS TemplateTool to create a new SMS template for reuse in campaigns.
Create SubaccountTool to create a new subaccount in ClickSend with access permissions and credentials.
Delete Email Delivery Receipt AutomationTool to delete an email delivery receipt automation rule.
Delete Inbound SMS AutomationTool to delete an inbound SMS automation rule.
Delete Contact ListTool to delete a specific contact list from your ClickSend account.
Delete Contact from ListTool to delete a specific contact from a contact list in your ClickSend account.
Remove Opted Out Contacts from ListTool to remove all opted out contacts from a contact list using an opt out list reference.
Cancel Scheduled SMSTool to cancel a scheduled SMS message by updating its status to cancelled.
Delete SMS TemplateTool to delete an SMS template by its template ID.
Delete SubaccountTool to delete a specific subaccount from the system.
Get Email CampaignTool to retrieve details of a specific email campaign by its ID.
Delete Email Delivery Receipt AutomationTool to delete an email delivery receipt automation rule.
Get Email Delivery Receipt AutomationTool to retrieve a specific email delivery receipt automation rule by its ID.
Update Email Delivery Receipt AutomationTool to update an email delivery receipt automation rule in ClickSend.
Delete Email TemplateTool to delete an email template by its template ID.
Get Email TemplateTool to retrieve a specific user email template by its template ID.
Update Email TemplateTool to update an existing email template in ClickSend.
Export Post Letters HistoryTool to export post letter history to a downloadable CSV file.
Delete Fax Delivery Receipt AutomationTool to delete a fax delivery receipt automation rule.
Get Fax Delivery Receipt AutomationTool to retrieve a specific fax delivery receipt automation rule by its ID.
Update Fax Delivery Receipt AutomationTool to update fax delivery receipt automation.
Update Inbound Fax AutomationTool to update an existing inbound fax automation rule in ClickSend.
Get Fax Receipt by Message IDTool to retrieve a single fax delivery receipt using the message identifier.
Mark Fax Receipts as ReadTool to mark fax delivery receipts as read in ClickSend.
Get Account InformationTool to retrieve authenticated user's account information.
Get All Email Delivery Receipt AutomationsTool to retrieve all email delivery receipt automation rules configured in your ClickSend account.
Get All Inbound Fax AutomationsTool to retrieve all inbound fax automation rules configured in your ClickSend account.
Get All Fax Delivery Receipt AutomationsTool to retrieve all fax delivery receipt automation rules configured in your ClickSend account.
Get All Inbound SMS AutomationsTool to retrieve all inbound SMS automation rules configured in your ClickSend account.
Get All SMS Delivery Receipt AutomationsTool to retrieve all SMS delivery receipt automation rules configured in your ClickSend account.
Get All Voice Delivery Receipt AutomationsTool to retrieve all voice delivery receipt automation rules configured in your ClickSend account.
Get Contact SuggestionsTool to retrieve contact suggestions from your ClickSend account.
Get All CountriesTool to retrieve all available country codes that ClickSend supports.
Get All Delivery IssuesTool to retrieve all delivery issues from your ClickSend account.
Get All Master Email TemplatesTool to retrieve all master email templates.
Get All Master Email Template CategoriesTool to retrieve all master email template categories.
Get All User Email TemplatesTool to retrieve all user email templates.
Get Fax Delivery ReceiptsTool to retrieve fax delivery receipts from your ClickSend account.
Get All Contact ListsTool to retrieve all contact lists from ClickSend account with pagination support.
Get Specific Contact ListTool to retrieve a specific contact list by its list ID.
Get All Contacts in ListTool to retrieve all contacts from a specific contact list in your ClickSend account with pagination and filtering support.
Get Specific ContactTool to retrieve a specific contact from a contact list in your ClickSend account.
Export Contacts ListTool to export contacts from a specific list to a CSV file.
Import Contacts to ListTool to import contacts to a contact list from a publicly accessible file URL.
Preview CSV Import for Contact ListTool to preview the first row of a CSV import file for a contact list in ClickSend.
Get List Import FieldsTool to retrieve acceptable import fields for a contact list in ClickSend.
Export MMS HistoryTool to export MMS message history with filtering, ordering, and pagination.
Get MMS Delivery ReceiptsTool to retrieve all MMS delivery receipts from your ClickSend account.
Get Dedicated NumbersTool to retrieve all available dedicated numbers associated with your ClickSend account.
Search Dedicated Numbers by CountryTool to search for available dedicated numbers by country code.
Search Direct Mail LocationsTool to search for direct mail locations in a specific country.
Get Post Letters HistoryTool to retrieve all post letters history with pagination.
Get Country PricingTool to retrieve pricing information for a specific country.
Get Referral AccountsTool to retrieve a list of referral accounts with pagination support.
Get Reseller SettingsTool to retrieve reseller settings and account information.
Get Reseller AccountsTool to retrieve a list of reseller accounts with pagination support.
Get SMS CampaignTool to retrieve details of a specific SMS campaign by its ID.
Get SMS Campaigns ListTool to retrieve all SMS campaigns with pagination and statistics breakdown.
Get Email to SMS Stripped String Rules ListTool to retrieve the list of email to sms stripped string rules with pagination support.
Get SMS HistoryTool to retrieve sent SMS message history with filtering and pagination.
Get Inbound SMS MessagesTool to retrieve inbound SMS messages sent to your account.
Get SMS Delivery ReceiptsTool to retrieve SMS delivery receipts from your ClickSend account.
Get All SMS TemplatesTool to retrieve all SMS templates from ClickSend account with pagination and filtering support.
Get SMS StatisticsTool to retrieve SMS messaging statistics for your ClickSend account.
Get Voice StatisticsTool to retrieve voice messaging statistics for your ClickSend account.
Get All SubaccountsTool to retrieve all subaccounts from ClickSend account with pagination support.
Get Specific SubaccountTool to retrieve detailed information about a specific subaccount by its ID.
Get Supported TimezonesTool to retrieve supported list of timezones.
Get Voice LanguagesTool to retrieve all available voice languages for text-to-speech.
List CountriesTool to retrieve the list of countries with IDs for global sending.
Copy Contact to Another ListTool to copy a contact from one list to another list.
Transfer Contact Between ListsTool to transfer a contact from one list to another in your ClickSend account.
Mark SMS Receipts as ReadTool to mark SMS delivery receipts as read in ClickSend.
Mark Voice Receipts as ReadTool to mark voice delivery receipts as read in ClickSend.
Get Master Email Template CategoryTool to retrieve a specific master email template category by its ID.
Get Master Email TemplateTool to retrieve a specific master email template by its template ID.
Get Master Email Templates in CategoryTool to retrieve all master email templates within a specific category.
Update MMS CampaignTool to update an existing MMS campaign with new parameters.
Cancel MMS CampaignTool to cancel a scheduled MMS campaign in ClickSend.
Get MMS CampaignsTool to retrieve all MMS campaigns with pagination and filtering support.
Calculate MMS Campaign PriceTool to calculate the price for an MMS campaign before sending.
Send MMS CampaignTool to create and send an MMS campaign to a contact list with multimedia content.
Export MMS HistoryTool to export all MMS history to a file.
Get MMS HistoryTool to retrieve all MMS message history with filtering and pagination.
Calculate MMS PriceTool to calculate the price for sending MMS messages without actually sending them.
Mark MMS Receipts as ReadTool to mark MMS delivery receipts as read in ClickSend.
Buy Dedicated NumberTool to purchase a dedicated phone number from ClickSend.
Delete Post Return AddressTool to delete a specific post return address from the system.
Get Post Return AddressTool to retrieve a specific post return address by its unique identifier.
Update Post Return AddressTool to update an existing post return address in ClickSend.
Upload FileTool to upload and optionally convert files for use with ClickSend messaging services.
Forgot PasswordTool to initiate password recovery for a ClickSend account.
Forgot UsernameTool to retrieve forgotten username by providing registered email or phone number.
Get Recharge PackagesTool to retrieve all available recharge packages from ClickSend.
Purchase Recharge PackageTool to purchase a recharge package by package ID.
Get Recharge Transaction by IDTool to retrieve details of a specific recharge transaction by transaction ID.
Get All Recharge TransactionsTool to retrieve all recharge transactions from ClickSend account with pagination support.
Search Contact ListsTool to search contact lists in ClickSend account with pagination support.
Send Email Verification TokenTool to send a verification email containing an activation token to a registered email address.
Cancel SMS CampaignTool to cancel a scheduled SMS campaign in ClickSend.
Cancel All Scheduled SMSTool to cancel all scheduled SMS messages in ClickSend.
Delete SMS Delivery Receipt AutomationTool to delete an SMS delivery receipt automation rule.
Get SMS Delivery Receipt AutomationTool to retrieve a specific SMS delivery receipt automation rule by its ID.
Update SMS Delivery Receipt AutomationTool to update an SMS delivery receipt automation rule in ClickSend.
Delete Email to SMS Stripped String RuleTool to delete an email to SMS stripped string rule from the account.
Get Email to SMS Stripped String RuleTool to retrieve an email to SMS stripped string rule by its ID.
Update Email to SMS Stripped String RuleTool to update an email to SMS stripped string rule.
Export SMS HistoryTool to export all SMS history to a file.
Get SMS HistoryTool to retrieve all SMS message history with filtering and pagination.
Delete Inbound SMS AutomationTool to delete an inbound SMS automation rule.
Get Inbound SMS AutomationTool to retrieve a specific inbound SMS automation rule by its ID.
Update Inbound SMS AutomationTool to update an existing inbound SMS automation rule in ClickSend.
Mark Inbound SMS as Read by Message IDTool to mark a specific inbound SMS message as read in ClickSend.
Mark Inbound SMS as ReadTool to mark inbound SMS messages as read in ClickSend.
Calculate SMS PriceTool to calculate the price for sending SMS messages without actually sending them.
Get SMS Receipt by Message IDTool to retrieve a single SMS delivery receipt using the message identifier.
Mark SMS Delivery Receipts as ReadTool to mark SMS delivery receipts as read in ClickSend.
Delete SMS TemplateTool to delete an SMS template by its template ID.
Update SMS TemplateTool to update an existing SMS template in ClickSend.
Delete Specific Allowed Email AddressTool to delete a specific allowed email address from the account.
Get Specific Allowed Email AddressTool to retrieve a specific allowed email address by its ID.
Regenerate Subaccount API KeyTool to regenerate API key for a specific subaccount.
Update Account InformationTool to update authenticated user's account information.
Update Email Delivery Receipt AutomationTool to update an email delivery receipt automation rule in ClickSend.
Update Inbound Fax AutomationTool to update an inbound fax automation rule in ClickSend.
Update Fax Delivery Receipt AutomationTool to update a fax delivery receipt automation rule in ClickSend.
Update Inbound SMS AutomationTool to update an existing inbound SMS automation rule in ClickSend.
Update SMS Delivery Receipt AutomationTool to update an SMS delivery receipt automation rule in ClickSend.
Update Voice Delivery Receipt AutomationTool to update a voice delivery receipt automation rule in ClickSend.
Update Contact ListTool to update the name of a specific contact list in your ClickSend account.
Update Contact in ListTool to update a specific contact in a contact list in your ClickSend account.
Get Recharge Credit Card InfoTool to retrieve stored credit card payment information in tokenized form.
Update Recharge Credit Card InfoTool to update credit card payment information for account recharge.
Update Reseller SettingsTool to update reseller account settings and configuration.
Update SMS CampaignTool to update an existing SMS campaign.
Update Stripped StringTool to update an email to SMS stripped string rule.
Update SMS TemplateTool to update an existing SMS template by its template ID.
Update SubaccountTool to update a specific subaccount's details and permissions in ClickSend.
Upload FileTool to upload files to ClickSend for use in messaging campaigns.
Agree to User Countries RulesTool to agree on rules and regulations for selected countries in Global Sending.
Get User CountriesTool to retrieve the list of selected countries for Global Sending.
Select User CountriesTool to select countries for Global SMS/MMS sending.
Verify Allowed Email AddressTool to verify an email address using the activation token sent to it.
Verify Forgot PasswordTool to verify forgot password request and reset user password.
Cancel All Scheduled Voice MessagesTool to cancel all scheduled voice messages in ClickSend.
Delete Voice Receipt AutomationTool to delete a voice delivery receipt automation rule.
Get Voice Delivery Receipt AutomationTool to retrieve a specific voice delivery receipt automation rule by its ID.
Update Voice Delivery Receipt AutomationTool to update a voice delivery receipt automation rule in ClickSend.
Export Voice HistoryTool to export all voice history to a file.
Mark Voice Delivery Receipts as ReadTool to mark voice delivery receipts as read in ClickSend.

What is the Composio tool router, and how does it fit here?

What is Tool Router?

Composio's Tool Router helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Tool Router

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Tool Router works

The Tool Router follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Prerequisites

Before you begin, make sure you have:
  • Python 3.8/Node 16 or higher installed
  • A Composio account with the API key
  • An OpenAI API key
  • A ClickSend account and project
  • Basic familiarity with async Python/Typescript

Getting API Keys for OpenAI, Composio, and ClickSend

OpenAI API key (OPENAI_API_KEY)
  • Go to the OpenAI dashboard
  • Create an API key if you don't have one
  • Assign it to OPENAI_API_KEY in .env
Composio API key and user ID
  • Log into the Composio dashboard
  • Copy your API key from Settings
    • Use this as COMPOSIO_API_KEY
  • Pick a stable user identifier (email or ID)
    • Use this as COMPOSIO_USER_ID

Installing dependencies

pip install composio-llamaindex llama-index llama-index-llms-openai llama-index-tools-mcp python-dotenv

Create a new Python project and install the necessary dependencies:

  • composio-llamaindex: Composio's LlamaIndex integration
  • llama-index: Core LlamaIndex framework
  • llama-index-llms-openai: OpenAI LLM integration
  • llama-index-tools-mcp: MCP client for LlamaIndex
  • python-dotenv: Environment variable management

Set environment variables

bash
OPENAI_API_KEY=your-openai-api-key
COMPOSIO_API_KEY=your-composio-api-key
COMPOSIO_USER_ID=your-user-id

Create a .env file in your project root:

These credentials will be used to:

  • Authenticate with OpenAI's GPT-5 model
  • Connect to Composio's Tool Router
  • Identify your Composio user session for ClickSend access

Import modules

import asyncio
import os
import dotenv

from composio import Composio
from composio_llamaindex import LlamaIndexProvider
from llama_index.core.agent.workflow import ReActAgent
from llama_index.core.workflow import Context
from llama_index.llms.openai import OpenAI
from llama_index.tools.mcp import BasicMCPClient, McpToolSpec

dotenv.load_dotenv()

Create a new file called clicksend_llamaindex_agent.py and import the required modules:

Key imports:

  • asyncio: For async/await support
  • Composio: Main client for Composio services
  • LlamaIndexProvider: Adapts Composio tools for LlamaIndex
  • ReActAgent: LlamaIndex's reasoning and action agent
  • BasicMCPClient: Connects to MCP endpoints
  • McpToolSpec: Converts MCP tools to LlamaIndex format

Load environment variables and initialize Composio

OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not OPENAI_API_KEY:
    raise ValueError("OPENAI_API_KEY is not set in the environment")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment")

What's happening:

This ensures missing credentials cause early, clear errors before the agent attempts to initialise.

Create a Tool Router session and build the agent function

async def build_agent() -> ReActAgent:
    composio_client = Composio(
        api_key=COMPOSIO_API_KEY,
        provider=LlamaIndexProvider(),
    )

    session = composio_client.create(
        user_id=COMPOSIO_USER_ID,
        toolkits=["clicksend"],
    )

    mcp_url = session.mcp.url
    print(f"Composio MCP URL: {mcp_url}")

    mcp_client = BasicMCPClient(mcp_url, headers={"x-api-key": COMPOSIO_API_KEY})
    mcp_tool_spec = McpToolSpec(client=mcp_client)
    tools = await mcp_tool_spec.to_tool_list_async()

    llm = OpenAI(model="gpt-5")

    description = "An agent that uses Composio Tool Router MCP tools to perform ClickSend actions."
    system_prompt = """
    You are a helpful assistant connected to Composio Tool Router.
    Use the available tools to answer user queries and perform ClickSend actions.
    """
    return ReActAgent(tools=tools, llm=llm, description=description, system_prompt=system_prompt, verbose=True)

What's happening here:

  • We create a Composio client using your API key and configure it with the LlamaIndex provider
  • We then create a tool router MCP session for your user, specifying the toolkits we want to use (in this case, clicksend)
  • The session returns an MCP HTTP endpoint URL that acts as a gateway to all your configured tools
  • LlamaIndex will connect to this endpoint to dynamically discover and use the available ClickSend tools.
  • The MCP tools are mapped to LlamaIndex-compatible tools and plug them into the Agent.

Create an interactive chat loop

async def chat_loop(agent: ReActAgent) -> None:
    ctx = Context(agent)
    print("Type 'quit', 'exit', or Ctrl+C to stop.")

    while True:
        try:
            user_input = input("\nYou: ").strip()
        except (KeyboardInterrupt, EOFError):
            print("\nBye!")
            break

        if not user_input or user_input.lower() in {"quit", "exit"}:
            print("Bye!")
            break

        try:
            print("Agent: ", end="", flush=True)
            handler = agent.run(user_input, ctx=ctx)

            async for event in handler.stream_events():
                # Stream token-by-token from LLM responses
                if hasattr(event, "delta") and event.delta:
                    print(event.delta, end="", flush=True)
                # Show tool calls as they happen
                elif hasattr(event, "tool_name"):
                    print(f"\n[Using tool: {event.tool_name}]", flush=True)

            # Get final response
            response = await handler
            print()  # Newline after streaming
        except KeyboardInterrupt:
            print("\n[Interrupted]")
            continue
        except Exception as e:
            print(f"\nError: {e}")

What's happening here:

  • We're creating a direct terminal interface to chat with your ClickSend database
  • The LLM's responses are streamed to the CLI for faster interaction.
  • The agent uses context to maintain conversation history
  • You can type 'quit' or 'exit' to stop the chat loop gracefully
  • Agent responses and any errors are displayed in a clear, readable format

Define the main entry point

async def main() -> None:
    agent = await build_agent()
    await chat_loop(agent)

if __name__ == "__main__":
    # Handle Ctrl+C gracefully
    signal.signal(signal.SIGINT, lambda s, f: (print("\nBye!"), exit(0)))
    try:
        asyncio.run(main())
    except KeyboardInterrupt:
        print("\nBye!")

What's happening here:

  • We're orchestrating the entire application flow
  • The agent gets built with proper error handling
  • Then we kick off the interactive chat loop so you can start talking to ClickSend

Run the agent

npx ts-node llamaindex-agent.ts

When prompted, authenticate and authorise your agent with ClickSend, then start asking questions.

Complete Code

Here's the complete code to get you started with ClickSend and LlamaIndex:

import asyncio
import os
import signal
import dotenv

from composio import Composio
from composio_llamaindex import LlamaIndexProvider
from llama_index.core.agent.workflow import ReActAgent
from llama_index.core.workflow import Context
from llama_index.llms.openai import OpenAI
from llama_index.tools.mcp import BasicMCPClient, McpToolSpec

dotenv.load_dotenv()

OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not OPENAI_API_KEY:
    raise ValueError("OPENAI_API_KEY is not set")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set")

async def build_agent() -> ReActAgent:
    composio_client = Composio(
        api_key=COMPOSIO_API_KEY,
        provider=LlamaIndexProvider(),
    )

    session = composio_client.create(
        user_id=COMPOSIO_USER_ID,
        toolkits=["clicksend"],
    )

    mcp_url = session.mcp.url
    print(f"Composio MCP URL: {mcp_url}")

    mcp_client = BasicMCPClient(mcp_url, headers={"x-api-key": COMPOSIO_API_KEY})
    mcp_tool_spec = McpToolSpec(client=mcp_client)
    tools = await mcp_tool_spec.to_tool_list_async()

    llm = OpenAI(model="gpt-5")
    description = "An agent that uses Composio Tool Router MCP tools to perform ClickSend actions."
    system_prompt = """
    You are a helpful assistant connected to Composio Tool Router.
    Use the available tools to answer user queries and perform ClickSend actions.
    """
    return ReActAgent(
        tools=tools,
        llm=llm,
        description=description,
        system_prompt=system_prompt,
        verbose=True,
    );

async def chat_loop(agent: ReActAgent) -> None:
    ctx = Context(agent)
    print("Type 'quit', 'exit', or Ctrl+C to stop.")

    while True:
        try:
            user_input = input("\nYou: ").strip()
        except (KeyboardInterrupt, EOFError):
            print("\nBye!")
            break

        if not user_input or user_input.lower() in {"quit", "exit"}:
            print("Bye!")
            break

        try:
            print("Agent: ", end="", flush=True)
            handler = agent.run(user_input, ctx=ctx)

            async for event in handler.stream_events():
                # Stream token-by-token from LLM responses
                if hasattr(event, "delta") and event.delta:
                    print(event.delta, end="", flush=True)
                # Show tool calls as they happen
                elif hasattr(event, "tool_name"):
                    print(f"\n[Using tool: {event.tool_name}]", flush=True)

            # Get final response
            response = await handler
            print()  # Newline after streaming
        except KeyboardInterrupt:
            print("\n[Interrupted]")
            continue
        except Exception as e:
            print(f"\nError: {e}")

async def main() -> None:
    agent = await build_agent()
    await chat_loop(agent)

if __name__ == "__main__":
    # Handle Ctrl+C gracefully
    signal.signal(signal.SIGINT, lambda s, f: (print("\nBye!"), exit(0)))
    try:
        asyncio.run(main())
    except KeyboardInterrupt:
        print("\nBye!")

Conclusion

You've successfully connected ClickSend to LlamaIndex through Composio's Tool Router MCP layer. Key takeaways:
  • Tool Router dynamically exposes ClickSend tools through an MCP endpoint
  • LlamaIndex's ReActAgent handles reasoning and orchestration; Composio handles integrations
  • The agent becomes more capable without increasing prompt size
  • Async Python provides clean, efficient execution of agent workflows
You can easily extend this to other toolkits like Gmail, Notion, Stripe, GitHub, and more by adding them to the toolkits parameter.

How to build ClickSend MCP Agent with another framework

OpenAI Agents SDK

OpenAI Agents SDK

Use ClickSend MCP with OpenAI Agents SDK

Claude Agent SDK

Claude Agent SDK

Use ClickSend MCP with Claude Agent SDK

Google ADK

Google ADK

Use ClickSend MCP with Google ADK

LangChain

LangChain

Use ClickSend MCP with LangChain

Vercel AI SDK

Vercel AI SDK

Use ClickSend MCP with Vercel AI SDK

Mastra AI

Mastra AI

Use ClickSend MCP with Mastra AI

CrewAI

CrewAI

Use ClickSend MCP with CrewAI

Claude Code

Claude Code

Use ClickSend MCP with Claude Code

Codex

Codex

Use ClickSend MCP with Codex

FAQ

What are the differences in Tool Router MCP and ClickSend MCP?

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

Can I use Tool Router MCP with LlamaIndex?

Yes, you can. LlamaIndex 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 ClickSend tools.

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

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

Used by agents from

Context
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai
Context
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai
Context
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai

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