Claude + Excel: What the Integration Can (and Can't) Do in 2026
Claude can read an Excel workbook — but it can’t edit one through this connector. The way Claude reaches a spreadsheet stored in OneDrive or SharePoint is through Claude’s Microsoft 365 connector, and Anthropic states that connector is read-only. Claude can search and read the values in a workbook to use as context — but it cannot edit cells, add formulas, or write anything back. And like every Claude connector, even that read-only access only works inside a chat you start — there are no triggers, and nothing runs while you’re away.
Here’s exactly how the connection works, how to turn it on, where the limits bite, and what to use if you want Excel work that runs on its own.
How Claude connects to Excel
There’s no standalone Excel app in Anthropic’s Connectors Directory. An Excel workbook is reached through the Microsoft 365 connector — Anthropic’s single read-only bridge across the Microsoft 365 suite, built on the Model Context Protocol (MCP) like the rest of the 400+ directory connectors.
The defining fact is right there in how Anthropic describes it: the Microsoft 365 connector is read-only. Through it, Claude can:
- Read an Excel workbook stored in OneDrive or SharePoint — pull its values into the conversation as context.
- Search Outlook, SharePoint, OneDrive, and Teams — bring email, files, and discussions in as context too.
What it cannot do is just as important:
- No editing cells or changing values.
- No adding formulas, rows, tabs, or anything else to the workbook.
- No writing back or uploading — the same read-only limit that applies across the 365 connector.
So out of the box, Claude treats your workbook as a document to read, not a sheet to operate. You can ask “what does this workbook say about Q3 spend?” and get an answer; you can’t ask Claude to write the answer back into a cell. (For the broader picture of this connector, see Claude for Microsoft 365.)
A note to avoid confusion: Anthropic also ships a separate “Claude for Excel” Office add-in that works inside the Excel app itself — that’s a different thing from the read-only Microsoft 365 connector described here. The connector path is read-only.
How to set it up
Setup lives in Claude’s connector settings:
- Open Settings → Connectors in the Claude app or on claude.ai.
- Find the Microsoft 365 connector and click Connect.
- Sign in with your Microsoft account and approve the requested permissions (your tenant admin may need to allow it).
- Back in a chat, point Claude at a workbook in your OneDrive or SharePoint — it’ll read it through the read-only connector.
The first-party directory connectors are available broadly; custom connectors (your own MCP server) require a paid plan. Note that connecting won’t unlock editing — the read-only limit stands regardless of plan.
The limits that actually matter
The read-only nature is the whole story here. The integration’s shape is “a reader of your workbooks,” not “an agent that maintains them.” Three limits define it:
- Read-only, full stop. The connector can read a workbook but can’t change it. Edited cells, added formulas, and new rows are off the table.
- No triggers, no automation. Even the read access only works inside a conversation you start. There’s no “when a number changes, recalculate and notify” or “when a new figure lands, update the model.” Nothing fires on a spreadsheet event — you have to be in the chat, prompting.
- Conversation-only and laptop-bound for scheduled work. Claude helps in the moment; it doesn’t sit on your workbook keeping it current. The closest thing to “running on its own” is Claude Cowork’s scheduled tasks, which fire on a fixed clock and only “while your computer is awake and the Claude Desktop app is open.”
So Claude is great for “read this workbook and tell me what it means right now” and not built for “keep this spreadsheet updated as data comes in.”
If you want Excel work that runs on its own: Carly
The moment you want a workbook kept current without you in the chat — values updated the instant data arrives, a summary emailed on schedule — you’ve crossed past what Claude’s read-only connector is for.
That’s where Carly fits. Carly is an AI executive assistant built to act on triggers, not just read in a chat:
- Fires on events, 24/7, in the cloud — when new data arrives, Carly acts; your laptop doesn’t need to be awake.
- Writes to your spreadsheet as part of a workflow — and ties it to email, calendar, CRM, and tasks.
- Actually sends and updates — drafts and sends email (Gmail and Outlook) with attachments, files and labels, manages tasks, updates your CRM, and records meetings — the actions a read-only connector can’t touch.
- Builds the workflow for you — tell it “I’d like to set up a system that logs every new figure into a workbook and emails me a weekly summary” in plain English; it interviews you, then builds it with you. No prompt engineering, no MCP server to host.
AI agents start at $35/month, and steps in a workflow that don’t use AI run free and unlimited. Carly connects to 200+ tools across 40+ categories — see integrations and the Excel integration page. By the way, Carly also integrates with Excel.
Claude’s Excel integration vs Carly
| Claude (Microsoft 365 connector) | Carly | |
|---|---|---|
| Read a workbook | Yes (read-only) | Yes |
| Edit cells / add formulas | No (read-only) | Yes (automatically) |
| Reads files / content | Yes | Yes |
| Edits / creates / posts | No (read-only) | Yes |
| Acts on triggers / events | No | Yes |
| Works while laptop is closed | No | Yes (cloud) |
| Sends email as part of the flow | No (Gmail draft-only) | Yes (Gmail + Outlook) |
| Pricing | Pro $20 / Max $100–$200 | AI agents from $35/mo |
Claude’s connector is a strong workbook reader inside a chat. Carly is a teammate that keeps your spreadsheets running.
Frequently Asked Questions
Does Claude integrate with Excel?
Through the Microsoft 365 connector — but Anthropic states it’s read-only. Claude can read an Excel workbook stored in OneDrive or SharePoint as context inside a chat (along with Outlook, SharePoint, OneDrive, and Teams), but it can’t edit cells, add formulas, or write anything back.
Can Claude edit or update an Excel spreadsheet?
Not through the Microsoft 365 connector — it’s read-only. Claude can read values but cannot change cells, add formulas, or upload. For automatic, write-capable spreadsheet work, you need an agent platform like Carly.
How do I connect Claude to Excel?
Go to Settings → Connectors in the Claude app or on claude.ai, connect the Microsoft 365 connector, sign in with your Microsoft account, and approve permissions (your admin may need to allow it). Then point Claude at a workbook in OneDrive or SharePoint in a chat.
Isn’t there a “Claude for Excel” add-in?
That’s a separate Office add-in that works inside the Excel app itself — different from the read-only Microsoft 365 connector covered here. The connector path described in this guide is read-only.
What if I want my spreadsheet kept current without me in the chat?
That’s outside what Claude’s read-only connector does. Carly fires on events 24/7 in the cloud, writing to your spreadsheet, sending email, and updating your tools as data arrives. AI agents start at $35/month.
More: Claude connectors · Claude for Microsoft 365 · Can Claude send emails · Claude vs Carly · Claude Cowork alternatives · Best AI agents for productivity
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