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How to integrate Excel MCP with LlamaIndex

Connect LlamaIndex to Excel MCP. Add sales data row to q2 table, create bar chart from revenue column, and more using natural language, with authentication handled for you.

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Microsoft Excel is a robust spreadsheet application for organizing, analyzing, and visualizing data. It's the go-to tool for calculations, reporting, and flexible data management.

125 Tools

Introduction

This guide walks you through connecting Excel to LlamaIndex using the Composio tool router. By the end, you'll have a working Excel agent that can create workbooks and worksheets, read and update cell ranges, add rows to tables, build charts, and sort and filter data through natural language commands.

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

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

For exact tool slugs and parameter tables, see the tool catalog in the Composio docs.

Also integrate Excel with

Claude CodeCursorChatGPTClaude CoworkAntigravityOpenAI Agents SDKClaude Agent SDKGrok BotCodexKimi CodeGrok BuildVS CodeOpenCodeOpenClawHermesAtomic AgentCLIGoogle ADKLangChainVercel AI SDKMastra AICrewAIPydantic AIAutoGen

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 Excel
  • Connect LlamaIndex to the Excel MCP server
  • Build a Excel-powered agent using LlamaIndex
  • Interact with Excel 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 Excel MCP server, and what's possible with it?

The Excel MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Excel account. It provides structured and secure access to your spreadsheets, so your agent can perform actions like adding data, creating tables, managing worksheets, generating charts, and sharing workbooks on your behalf.

  • Automated data entry and updates: Let your agent add rows, columns, or clear specific ranges in any worksheet—keeping your data fresh, organized, and accurate.
  • Effortless table and worksheet management: Direct your agent to create tables, add new worksheets, or organize data structures for seamless tracking and reporting.
  • Dynamic chart generation: Have your agent visualize your data instantly by adding charts to any worksheet for quick insights and analysis.
  • Advanced filtering and sorting: Ask your agent to apply filters or custom sorts to tables, making it easy to focus on what matters most in your datasets.
  • Secure sharing and permission control: Empower your agent to grant access or update permissions on workbooks, ensuring your team can collaborate safely and efficiently.

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

What is Composio SDK?

Composio's Composio SDK 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 Composio SDK

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

How the Composio SDK works

The Composio SDK 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

Step by step10 STEPS
1

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 Excel account and project
  • Basic familiarity with async Python/Typescript
2

Getting API Keys for OpenAI, Composio, and Excel

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
3

Installing dependencies

npm install @composio/llamaindex @llamaindex/openai @llamaindex/tools @llamaindex/workflow dotenv

Create a new Typescript project and install the necessary dependencies:

  • @composio/llamaindex: Composio's LlamaIndex integration
  • @llamaindex/openai: OpenAI LLM integration
  • @llamaindex/tools: MCP client for LlamaIndex
  • @llamaindex/workflow: Workflow framework for LlamaIndex
  • dotenv: Environment variable management
4

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 Excel access
5

Import modules

import "dotenv/config";
import readline from "node:readline/promises";
import { stdin as input, stdout as output } from "node:process";

import { Composio } from "@composio/core";

import { mcp } from "@llamaindex/tools";
import { agent as createAgent } from "@llamaindex/workflow";
import { openai } from "@llamaindex/openai";

dotenv.config();

Create a new file called excel_llamaindex_agent.ts and import the required modules:

Key imports:

  • dotenv.config loads .env at runtime
  • readline gives us a simple CLI chat loop
  • Composio is the main Composio SDK client
  • mcp connects to an MCP endpoint
  • createAgent builds a LlamaIndex agent
  • openai configures the LLM backend
6

Load environment variables and initialize Composio

const OPENAI_API_KEY = process.env.OPENAI_API_KEY;
const COMPOSIO_API_KEY = process.env.COMPOSIO_API_KEY;
const COMPOSIO_USER_ID = process.env.COMPOSIO_USER_ID;

if (!OPENAI_API_KEY) throw new Error("OPENAI_API_KEY is not set");
if (!COMPOSIO_API_KEY) throw new Error("COMPOSIO_API_KEY is not set");
if (!COMPOSIO_USER_ID) throw new Error("COMPOSIO_USER_ID is not set");

What's happening:

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

7

Create a Tool Router session and build the agent function

async function buildAgent() {

  console.log(`Initializing Composio client...${COMPOSIO_USER_ID!}...`);
  console.log(`COMPOSIO_USER_ID: ${COMPOSIO_USER_ID!}...`);

  const composio = new Composio({
    apiKey: COMPOSIO_API_KEY,
    provider: new LlamaindexProvider(),
  });

  const session = await composio.create(
    COMPOSIO_USER_ID!,
    {
      toolkits: ["excel"],
    },
  );

  const mcpUrl = session.mcp.url;
  console.log(`Composio Tool Router MCP URL: ${mcpUrl}`);

  const server = mcp({
    url: mcpUrl,
    clientName: "composio_tool_router_with_llamaindex",
    requestInit: {
      headers: {
        "x-api-key": COMPOSIO_API_KEY!,
      },
    },
    // verbose: true,
  });

  const tools = await server.tools();

  const llm = openai({ apiKey: OPENAI_API_KEY, model: "gpt-5" });

  const agent = createAgent({
    name: "composio_tool_router_with_llamaindex",
        description : "An agent that uses Composio Tool Router MCP tools to perform actions.",
    systemPrompt:
      "You are a helpful assistant connected to Composio Tool Router."+
"Use the available tools to answer user queries and perform Excel actions." ,
    llm,
    tools,
  });

  return agent;
}

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, excel)
  • 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 Excel tools.
  • The MCP tools are mapped to LlamaIndex-compatible tools and plug them into the Agent.
8

Create an interactive chat loop

async function chatLoop(agent: ReturnType<typeof createAgent>) {
  const rl = readline.createInterface({ input, output });

  console.log("Type 'quit' or 'exit' to stop.");

  while (true) {
    let userInput: string;

    try {
      userInput = (await rl.question("\nYou: ")).trim();
    } catch {
      console.log("\nAgent: Bye!");
      break;
    }

    if (!userInput) {
      continue;
    }

    const lower = userInput.toLowerCase();
    if (lower === "quit" || lower === "exit") {
      console.log("Agent: Bye!");
      break;
    }

    try {
      process.stdout.write("Agent: ");

      const stream = agent.runStream(userInput);
      let finalResult: any = null;

      for await (const event of stream) {
        // The event.data contains the streamed content
        const data: any = event.data;

        // Check for streaming delta content
        if (data?.delta) {
          process.stdout.write(data.delta);
        }

        // Store final result for fallback
        if (data?.result || data?.message) {
          finalResult = data;
        }
      }

      // If no streaming happened, show the final result
      if (finalResult) {
        const answer =
          finalResult.result ??
          finalResult.message?.content ??
          finalResult.message ??
          "";
        if (answer && typeof answer === "string" && !answer.includes("[object")) {
          process.stdout.write(answer);
        }
      }

      console.log(); // New line after streaming completes
    } catch (err: any) {
      console.error("\nAgent error:", err?.message ?? err);
    }
  }

  rl.close();
}

What's happening:

  • We're creating a direct terminal interface to chat with Excel
  • The LLM's responses are streamed to the CLI for faster interaction.
  • The agent uses context to maintain conversation history
  • The agent processes the request, selects appropriate Excel tools, and returns a result
  • We extract the answer from the result data structure and display it to the user
  • You can type 'quit' or 'exit' to stop the chat loop gracefully
  • Agent responses and any errors are streamed in a clear, readable format
9

Define the main entry point

async function main() {
  try {
    const agent = await buildAgent();
    await chatLoop(agent);
  } catch (err) {
    console.error("Failed to start agent:", err);
    process.exit(1);
  }
}

main();

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 Excel
10

Run the agent

npx ts-node llamaindex-agent.ts

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

Complete Code

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

import "dotenv/config";
import readline from "node:readline/promises";
import { stdin as input, stdout as output } from "node:process";

import { Composio } from "@composio/core";
import { LlamaindexProvider } from "@composio/llamaindex";

import { mcp } from "@llamaindex/tools";
import { agent as createAgent } from "@llamaindex/workflow";
import { openai } from "@llamaindex/openai";

dotenv.config();

const OPENAI_API_KEY = process.env.OPENAI_API_KEY;
const COMPOSIO_API_KEY = process.env.COMPOSIO_API_KEY;
const COMPOSIO_USER_ID = process.env.COMPOSIO_USER_ID;

if (!OPENAI_API_KEY) {
    throw new Error("OPENAI_API_KEY is not set in the environment");
  }
if (!COMPOSIO_API_KEY) {
    throw new Error("COMPOSIO_API_KEY is not set in the environment");
  }
if (!COMPOSIO_USER_ID) {
    throw new Error("COMPOSIO_USER_ID is not set in the environment");
  }

async function buildAgent() {

  console.log(`Initializing Composio client...${COMPOSIO_USER_ID!}...`);
  console.log(`COMPOSIO_USER_ID: ${COMPOSIO_USER_ID!}...`);

  const composio = new Composio({
    apiKey: COMPOSIO_API_KEY,
    provider: new LlamaindexProvider(),
  });

  const session = await composio.create(
    COMPOSIO_USER_ID!,
    {
      toolkits: ["excel"],
    },
  );

  const mcpUrl = session.mcp.url;
  console.log(`Composio Tool Router MCP URL: ${mcpUrl}`);

  const server = mcp({
    url: mcpUrl,
    clientName: "composio_tool_router_with_llamaindex",
    requestInit: {
      headers: {
        "x-api-key": COMPOSIO_API_KEY!,
      },
    },
    // verbose: true,
  });

  const tools = await server.tools();

  const llm = openai({ apiKey: OPENAI_API_KEY, model: "gpt-5" });

  const agent = createAgent({
    name: "composio_tool_router_with_llamaindex",
    description:
      "An agent that uses Composio Tool Router MCP tools to perform actions.",
    systemPrompt:
      "You are a helpful assistant connected to Composio Tool Router."+
"Use the available tools to answer user queries and perform Excel actions." ,
    llm,
    tools,
  });

  return agent;
}

async function chatLoop(agent: ReturnType<typeof createAgent>) {
  const rl = readline.createInterface({ input, output });

  console.log("Type 'quit' or 'exit' to stop.");

  while (true) {
    let userInput: string;

    try {
      userInput = (await rl.question("\nYou: ")).trim();
    } catch {
      console.log("\nAgent: Bye!");
      break;
    }

    if (!userInput) {
      continue;
    }

    const lower = userInput.toLowerCase();
    if (lower === "quit" || lower === "exit") {
      console.log("Agent: Bye!");
      break;
    }

    try {
      process.stdout.write("Agent: ");

      const stream = agent.runStream(userInput);
      let finalResult: any = null;

      for await (const event of stream) {
        // The event.data contains the streamed content
        const data: any = event.data;

        // Check for streaming delta content
        if (data?.delta) {
          process.stdout.write(data.delta);
        }

        // Store final result for fallback
        if (data?.result || data?.message) {
          finalResult = data;
        }
      }

      // If no streaming happened, show the final result
      if (finalResult) {
        const answer =
          finalResult.result ??
          finalResult.message?.content ??
          finalResult.message ??
          "";
        if (answer && typeof answer === "string" && !answer.includes("[object")) {
          process.stdout.write(answer);
        }
      }

      console.log(); // New line after streaming completes
    } catch (err: any) {
      console.error("\nAgent error:", err?.message ?? err);
    }
  }

  rl.close();
}

async function main() {
  try {
    const agent = await buildAgent();
    await chatLoop(agent);
  } catch (err: any) {
    console.error("Failed to start agent:", err?.message ?? err);
    process.exit(1);
  }
}

main();

Conclusion

You've successfully connected Excel to LlamaIndex through Composio's Tool Router MCP layer. Key takeaways:
  • Tool Router dynamically exposes Excel 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.
TOOLS

Supported Tools

Every Excel action and event your agent gets out of the box.

Add Chart

Add a chart to a worksheet using Microsoft Graph API.

Add Named Item

Add a workbook- or worksheet-scoped named item using an invariant reference or a local formula.

Add SharePoint Worksheet

Add a new worksheet to an Excel workbook in a SharePoint site's default drive using Microsoft Graph.

Add Table

Create a new table in a worksheet using the Microsoft Graph API.

Add Table Column

Add a column to a table using Microsoft Graph API.

Add Table Row

Add a row to a table using Microsoft Graph API.

Add Workbook Permission

Tool to grant access to a workbook via invite.

Add Worksheet

Add a new worksheet to an Excel workbook using Microsoft Graph API.

Apply Table Filter

Apply a filter to a table column using Microsoft Graph API.

Apply Table Sort

Apply a sort to a table using Microsoft Graph API.

Autofit Range

Autofit columns or rows intersecting a workbook range.

Calculate Workbook Function

Run one allowlisted Microsoft Graph v1.

Calculate Excel Workbook

Calculate Excel Workbook

Clear Range

Tool to clear values, formats, or contents in a specified worksheet range.

Clear Table Filter

Clear a filter from a table column using Microsoft Graph API.

Clear All Table Filters

Clear All Table Filters

Clear Table Sort

Clear Table Sort

Close Excel Session

Tool to close an existing Excel workbook session.

Convert Table To Range

Convert a table to a range using Microsoft Graph API.

Copy Drive Item

Create a non-destructive asynchronous copy of a file or folder.

Create Comment

Create a plain-text Excel cell comment through Microsoft Graph beta.

Create Folder

Create a folder under a parent Microsoft Graph drive item.

Create Upload Session

Create a resumable upload session at a drive-root path.

Create Workbook

Tool to create a new Excel workbook file at a specified drive path.

Create Workbook Sharing Link

Create or retrieve an application-owned sharing link for a workbook.

Delete Drive Item

Move a OneDrive or SharePoint drive item to the recycle bin by item ID.

Delete Named Item

Permanently delete a workbook-scoped named item; this cannot be undone.

Delete Range

Delete worksheet cells and shift the remaining cells up or left.

Delete Table

Permanently delete an Excel table by its ID or name.

Delete Table Column

Delete a column from a table using Microsoft Graph API.

Delete Table Row

Delete a row from a table using Microsoft Graph API.

Delete Worksheet

Tool to delete a worksheet from the workbook.

Download Workbook

Download an Excel workbook in its original file format.

Export Workbook to PDF

Export an Excel workbook to PDF using Microsoft Graph format conversion, returning a download URL.

Get Excel Application

Get Excel Application

Get chart

Get chart

Get Chart Axis

Tool to retrieve a specific axis from a chart.

Get chart component

Retrieve one Excel chart component: chart title, axis title, supported gridlines, axis font, or supported line format.

Get Chart Data Labels

Tool to retrieve the data labels object of a chart.

Get chart image

Render an Excel chart as a base64-encoded image.

Get Chart Legend

Tool to retrieve the legend object of a chart.

Get chart point

Get chart point

Get chart series

Get chart series

Get Comment

Retrieve one workbook comment by its exact ID.

Get Comment Reply

Retrieve one reply to a workbook comment by its exact ID.

Get Derived Range

Return a range derived from another range by navigation or geometry.

Get Drive Item

Retrieve OneDrive or SharePoint drive item metadata by exact ID or path.

Get Named Item

Retrieve a workbook-scoped named item by exact name.

Get Named Item Range

Retrieve the Excel range of a range-valued workbook-scoped named item.

Get Excel Operation Status

Get the status of an asynchronous Excel workbook operation by its operation ID.

Get Pivot Table

Get Pivot Table

Get Projected Worksheet Subresource

Read selected properties from a worksheet range, its used range, or worksheet protection.

Get Range

Get a range from a worksheet using Microsoft Graph API.

Get Range Format

Read one formatting component from a workbook range.

Create Excel Session

Create a session for an Excel workbook using Microsoft Graph API.

Get SharePoint Range

Get a range from a worksheet in SharePoint using Microsoft Graph Sites API.

Get SharePoint Worksheet

Get a worksheet by name or ID from an Excel workbook in a SharePoint site's default drive using Microsoft Graph.

Get Table

Retrieve one workbook- or worksheet-addressed table by ID or exact name.

Get table column

Tool to retrieve a specific column from a workbook table.

Get Table Column Cell

Read one cell by row within a selected table column's data body.

Get Table Column Range

Get Table Column Range

Get Table Range

Get Table Range

Get Table Row

Get Table Row

Get Table Row Range

Get Table Row Range

Get Table Sort

Get Table Sort

Get Visible Range

Read cells visible after worksheet filtering.

Get workbook

Retrieve a workbook's relationships, including comments, named items, operations, tables, and worksheets, with optional relationship expansion.

Get Worksheet

Get a worksheet by name or ID from an Excel workbook using Microsoft Graph API.

Get Worksheet Protection

Get Worksheet Protection

Get Worksheet Row Range

Read a zero-based worksheet row across the column bounds of the worksheet's values-only used range.

Get Worksheet Used Range

Tool to retrieve a worksheet's used range (active data region) without specifying a fixed range address.

Insert Range

Tool to insert a new cell range into a worksheet, shifting existing cells down or right.

List chart points

List chart points

List Charts

List charts in a worksheet using Microsoft Graph API.

List Chart Series

List a page of data series names in a chart, with a next-page link when more results are available.

List Comment Replies

List replies to one workbook comment.

List Comments

List a page of comments in an Excel workbook using Microsoft Graph.

List Drive Item Children

Tool to list immediate children (files/folders) of a folder DriveItem using driveId and itemId.

List Drive Item Versions

List retained versions of a OneDrive or SharePoint workbook file.

List Drive Files

List files and folders in a drive root or specified path.

List Named Items

List named items in a workbook using Microsoft Graph.

List Pivot Tables

List Pivot Tables

List SharePoint Tables

List tables in a worksheet of an Excel workbook stored in a SharePoint site's default drive using Microsoft Graph.

List SharePoint Worksheets

List worksheets in an Excel workbook stored in SharePoint using Microsoft Graph Sites API.

List Site Lists

List SharePoint lists in a known Microsoft Graph site.

List Table Columns

List columns in a table using Microsoft Graph API.

List Table Rows

List rows in a table using Microsoft Graph API.

List Tables

List tables in a specified Excel worksheet using Microsoft Graph API.

List Workbook Permissions

Tool to list permissions set on the workbook file.

List Workbook Tables

List tables across a workbook without requiring a worksheet identifier.

List Worksheets

List worksheets in an Excel workbook using Microsoft Graph API.

Merge Cells

Merge cells in a worksheet range using Microsoft Graph API.

Protect Worksheet

Tool to protect a worksheet using optional protection options.

Reapply All Table Filters

Reapply All Table Filters

Reapply Table Sort

Reapply Table Sort

Refresh Pivot Tables

Refresh Pivot Tables

Refresh Excel Session

Refresh Excel Session

Resolve Shared Workbook

Resolve a Microsoft Graph share token, shareId, or raw sharing URL to DriveItem metadata.

Revoke Workbook Permission

Remove a non-inherited sharing permission from a workbook.

Run Graph Mutation Batch

Create, update, or delete drive or workbook resources in up to 20 requests; inspect every subresponse status because individual mutations can fail.

Run Graph Read Batch

Read drive or workbook data in up to 20 GET requests; inspect every subresponse status because individual requests can fail.

Search Drive Files

Search OneDrive drive items by query and return files, optionally filtered by extension, to discover Excel workbook IDs.

Search Microsoft 365 Content

Search OneDrive and SharePoint content using Microsoft Search.

Search Sites

Search SharePoint sites by free-text query for workbook discovery.

Set chart data

Replace an Excel chart's source range and optionally choose whether rows or columns define its series.

Set chart position

Set chart position

Sort Range

Sort a range in a worksheet using Microsoft Graph API.

Unmerge Range

Split a merged worksheet range back into separate cells.

Unprotect Worksheet

Remove protection from a worksheet so it can be edited again.

Update Chart

Update a chart in a worksheet using Microsoft Graph API.

Update chart component

Update one Excel chart component: an axis, data labels, chart title, axis title, supported gridlines, axis font, fill, or supported line format.

Update Chart Legend

Update a chart legend's visibility, position, or overlay setting.

Update chart series

Rename one Excel chart series by ID or zero-based collection position.

Update Drive Item

Rename, move within the same drive, or update client timestamps for a DriveItem by stable ID.

Update Named Item

Update a workbook named item's visibility or comment.

Update Range

Update cell values in a specified worksheet range using Microsoft Graph API.

Update Range Format

Update exactly one formatting component on a workbook range.

Update SharePoint Range

Update values in a worksheet range in an Excel workbook stored in a SharePoint site's default drive using Microsoft Graph.

Update Table

Update an Excel workbook table's name, header visibility, totals visibility, or style using Microsoft Graph.

Update Table Column

Update the name or values of an Excel table column.

Update Table Column Range

Update raw values in a table column's data-body cells by zero-based index.

Update Table Row

Update Table Row

Update Worksheet

Update worksheet properties (name, position) in an Excel workbook using Microsoft Graph API.

Upload Workbook from URL

Tool to upload an external Excel file from a URL into OneDrive/SharePoint.

Who Am I

Return the identity (email, name) of the connected Excel (Microsoft) account.

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FAQ

Frequently asked questions

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