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Excel MCP server

41 operations0 webhooks

Read and write Excel workbooks in OneDrive for Business or SharePoint through Microsoft Graph.

Use Excel in Claude, ChatGPT, Cursor or another MCP client

Connect Excel once in Corsair, then add one MCP address to your agent.

Connect Excel

Building your own app on the Corsair SDK? Get API keys

Connect Excel to Claude, ChatGPT or Cursor

  1. 1

    Connect Excel in Corsair

    Sign in to Excel once in Corsair. Corsair stores the credential encrypted and makes the Excel API calls for your agent, so it never goes into a prompt or a config file. Connect Excel

    If your link lets the agent add apps, you can skip this: it gives you a sign-in link the first time it needs Excel. On a ChatGPT personal plan, connect Excel here first.

  2. 2

    Add Corsair's MCP server to your agent

    Every client uses the same address:

    https://mcp.corsair.dev/mcp

    Claude

    Open Customize → Connectors → Add custom connector, paste the address, then select Connect.

    ChatGPT

    Add a custom MCP server with the address and choose OAuth. Personal plans get read tools only.

    Cursor

    Add to CursorOr add this to ~/.cursor/mcp.json. Cursor opens Corsair to sign in the first time it connects.
    {
  "mcpServers": {
    "corsair": { "url": "https://mcp.corsair.dev/mcp" }
  }
}

    Claude Code

    Run this, then run /mcp in Claude Code to sign in.claude mcp add --transport http corsair https://mcp.corsair.dev/mcp

    Codex, Gemini CLI, VS Code, Zed and other clients with OAuth sign-in work the same way. Clients without it, such as GitHub Copilot's coding agent, use a link's own address and an API key. Setup for every client

  3. 3

    Sign in and choose what needs your approval

    Your client opens Corsair to sign in. Pick a link: the apps your agent can use and a mode that decides what it may do without asking. In the default Cautious mode, Excel's read and write operations run right away and its 5 destructive operations wait for your approval. Strict mode asks before every write and refuses destructive operations, and Read mode allows reads only.

Excel operations available through MCP

  • AddWrite

    Add a chart from a cell range

  • DeleteDestructive

    Delete a chart

  • GetRead-only

    Get one chart by name or id

  • ListRead-only

    List charts on a worksheet

  • Set DataWrite

    Point a chart at a different cell range

  • UpdateWrite

    Rename a chart or move and resize it

FAQ

Install corsair and @corsair-dev/excel, add the Excel plugin, and connect with OAuth. Then call methods like corsair.excel.api.charts.add() from your app. Corsair stores tokens, and keeps each tenant isolated.

Yes. Excel needs an OAuth app with scopes that match what you automate. Register the app in Excel, configure redirect URLs, then connect through Corsair or managed OAuth in Hub.

Yes. One Corsair client can hit Excel, GitHub, Notion, Stripe, and the rest. Trigger Excel from a webhook, push updates to Slack, or chain actions across plugins. Same tenant context across integrations, plain TypeScript.

Teams use Corsair for read and write excel workbooks in onedrive for business or sharepoint through microsoft graph. Common builds include sync jobs, admin tooling, and agents that call Excel APIs from your backend.

The SDK is open source. Self-host and you pay Corsair nothing for the integration layer. Hub bills for hosted auth and execution, not per Excel API call. Hub has a generous free tier. For hobby projects you can probably run the whole thing on free. Paid plans start to matter with more tenants or heavier traffic.

We maintain @corsair-dev/excel in the open repo. When Excel ships API changes, upgrade the package. Your call sites stay typed. You should not need to rewrite the integration layer each time.

No. Corsair does not read your Excel data or hold individual access credentials. Credentials stay in your database. API calls run on your instance. We do not store Excel data on your behalf.

Yes. Add https://mcp.corsair.dev/mcp as a custom connector or MCP server in Claude, ChatGPT, Cursor, VS Code, Claude Code, Codex or any client that supports remote MCP servers with OAuth sign-in, then sign in to Corsair. On ChatGPT personal plans, custom servers currently get read tools only.

Yes. Put Excel on a link in Strict mode and every write waits for your approval, while destructive actions are refused. The default Cautious mode asks only before the 5 destructive Excel operations. You can change a link's mode at hub.corsair.dev/me.