How to integrate Excel MCP with Antigravity

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How to integrate Excel MCP with Antigravity

Antigravity IDE is Google's agentic IDE, built on a VS Code-style editor and powered by models like Gemini 3.5 Flash, Gemini 3.1 Pro, Opus 4.6, and more. It treats the AI agent as a first-class teammate, planning, coding, and validating work through an Agent Manager dashboard with deep browser connectivity.

In this guide, I will explain the easiest and most secure way to connect your Excel account to Antigravity IDE via Composio Connect, so it can add sales data row to Q2 table, create bar chart from revenue column, share this workbook with your manager, and more without ever putting your account credentials at risk.

Also integrate Excel with

Why use Composio?

Composio provides:

  • Access to 1,000+ managed apps from a single MCP endpoint. This makes it convenient for agents to run cross-app workflows.
  • Programmatic tool calling. Allows LLMs to write code in a remote workbench to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
  • Large tool response handling outside the LLM context. This minimizes context bloat from large tool responses.
  • Dynamic just-in-time access to thousands of tools across hundreds of apps. Composio loads the tools your agent needs, so LLMs are not overwhelmed by tools they do not need.

Connect Excel to Antigravity

Antigravity does not ship with one-click custom MCP install links yet, so configuration goes through the IDE's raw config file. The process takes under a minute.

1. Open the MCP Config

Go to Antigravity Settings, open the Customizations tab, then click Open MCP Config to open mcp_config.json in the editor.

Antigravity Customizations settings with Open MCP Config button

2. Get your API key

Go to the Composio Dashboard and copy your API key.

Composio Dashboard showing where to get the API key

3. Add Composio to mcp_config.json

Paste the following configuration into the file:

bash
{
  "mcpServers": {
    "remote-composio": {
      "serverUrl": "https://connect.composio.dev/mcp",
      "headers": {
        "x-consumer-api-key": "your-composio-api-key"
      }
    }
  }
}

Note: Antigravity uses serverUrl, not url, for remote HTTP-based MCP servers. This differs from the url key used in Cursor and VS Code configs.

Save the file and click refresh in the Installed MCP Servers section.

Antigravity showing Composio tools after MCP setup

Connect your Excel account

Back in the Antigravity agent panel, ask the agent to connect to Excel or give it any Excel-related task.

For example, ask it to:

  • "Add sales data row to Q2 table"
  • "Create bar chart from revenue column"
  • "Share this workbook with your manager"

It will prompt you to authenticate and authorize access to Excel.

That is it. Composio tools are now available in Antigravity, and your Excel account is ready to use.

Supported Tools & Triggers

Tools
Add ChartAdd a chart to a worksheet using Microsoft Graph API.
Add SharePoint WorksheetAdd a new worksheet to a SharePoint Excel workbook using Microsoft Graph Sites API.
Add TableCreate a new table in a worksheet using the Microsoft Graph API.
Add Table ColumnAdd a column to a table using Microsoft Graph API.
Add Table RowAdd a row to a table using Microsoft Graph API.
Add Workbook PermissionTool to grant access to a workbook via invite.
Add WorksheetAdd a new worksheet to an Excel workbook using Microsoft Graph API.
Apply Table FilterApply a filter to a table column using Microsoft Graph API.
Apply Table SortApply a sort to a table using Microsoft Graph API.
Clear RangeTool to clear values, formats, or contents in a specified worksheet range.
Clear Table FilterClear a filter from a table column using Microsoft Graph API.
Close Excel SessionTool to close an existing Excel workbook session.
Convert Table To RangeConvert a table to a range using Microsoft Graph API.
Create WorkbookTool to create a new Excel workbook file at a specified drive path.
Delete Table ColumnDelete a column from a table using Microsoft Graph API.
Delete Table RowDelete a row from a table using Microsoft Graph API.
Delete WorksheetTool to delete a worksheet from the workbook.
Export Workbook to PDFTool to export an Excel workbook to PDF via Microsoft Graph's format conversion.
Get Chart AxisTool to retrieve a specific axis from a chart.
Get Chart Data LabelsTool to retrieve the data labels object of a chart.
Get Chart LegendTool to retrieve the legend object of a chart.
Get RangeGet a range from a worksheet using Microsoft Graph API.
Create Excel SessionCreate a session for an Excel workbook using Microsoft Graph API.
Get SharePoint RangeGet a range from a worksheet in SharePoint using Microsoft Graph Sites API.
Get SharePoint WorksheetGet a worksheet by name or ID from a SharePoint Excel workbook using Microsoft Graph Sites API.
Get table columnTool to retrieve a specific column from a workbook table.
Get workbookTool to retrieve the properties and relationships of a workbook.
Get WorksheetGet a worksheet by name or ID from an Excel workbook using Microsoft Graph API.
Get Worksheet Used RangeTool to retrieve a worksheet's used range (active data region) without specifying a fixed range address.
Insert RangeTool to insert a new cell range into a worksheet, shifting existing cells down or right.
List ChartsList charts in a worksheet using Microsoft Graph API.
List Chart SeriesTool to list all data series in a chart.
List CommentsTool to list comments in an Excel workbook.
List Drive Item ChildrenTool to list immediate children (files/folders) of a folder DriveItem using driveId and itemId.
List Drive FilesList files and folders in a drive root or specified path.
List Named ItemsList named items in a workbook using Microsoft Graph API.
List SharePoint TablesList tables in a SharePoint worksheet using Microsoft Graph Sites API.
List SharePoint WorksheetsList worksheets in an Excel workbook stored in SharePoint using Microsoft Graph Sites API.
List Table ColumnsList columns in a table using Microsoft Graph API.
List Table RowsList rows in a table using Microsoft Graph API.
List TablesList tables in a worksheet using Microsoft Graph API.
List Workbook PermissionsTool to list permissions set on the workbook file.
List WorksheetsList worksheets in an Excel workbook using Microsoft Graph API.
Merge CellsMerge cells in a worksheet range using Microsoft Graph API.
Protect WorksheetTool to protect a worksheet using optional protection options.
Search Drive FilesTool to search OneDrive drive items by query to discover Excel workbook IDs.
Sort RangeSort a range in a worksheet using Microsoft Graph API.
Update ChartUpdate a chart in a worksheet using Microsoft Graph API.
Update Chart LegendTool to update formatting or position of a chart legend.
Update RangeUpdate a range in a worksheet using Microsoft Graph API.
Update SharePoint RangeUpdate a range in a SharePoint worksheet using Microsoft Graph Sites API.
Update TableUpdate a table in a workbook using Microsoft Graph API.
Update WorksheetUpdate worksheet properties (name, position) in an Excel workbook using Microsoft Graph API.
Upload Workbook from URLTool to upload an external Excel file from a URL into OneDrive/SharePoint.

Conclusion

You have successfully connected Excel to Antigravity using Composio Connect. Your agent can now use Excel securely without exposing credentials in prompts or local scripts.

How to build Excel MCP Agent with another framework

FAQ

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

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

Can I use Tool Router MCP with Antigravity?

Yes, you can. Antigravity 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 Excel tools.

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

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

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