# Your workbooks. Read by your agent.

Source: https://corespeed.io/integrations/excel

Connect Microsoft Excel to Claude Code, Codex, Cursor or any MCP agent through CoreSpeed. Your agent finds a workbook in OneDrive or SharePoint, reads a sheet's values and formulas, and can write a range or add rows to a table, using your own Microsoft account. It works on .xlsx files, and approvals can hold any write.

## Set up an agent

Give your agent this line: `set up https://corespeed.io/SKILL.md (read it raw, e.g. with curl)`

It fetches the skill at https://corespeed.io/SKILL.md, adds the CoreSpeed MCP server, signs you in (or up), and keeps the skill for next time. Connect Microsoft Excel after setup. Access follows the connected account and its permissions. Create an account: https://app.corespeed.io/sign-up

## Read the numbers. Get the story

Let your agent find the workbook, read the sheet, and tell you which lines are off plan before you open Excel.

You ask your agent: "Find the Q4 budget workbook. Read the Summary sheet and tell me which teams are over plan and by how much. Do not edit the workbook."

It calls CoreSpeed:

- `excel__search_workbooks`: ok, 455 ms
- `excel__list_worksheets`: ok, 298 ms
- `excel__get_used_range`: ok, 640 ms

It reads from: Microsoft Excel.

### Budget check: One team is over plan.

Design is 3,200 over its 40,000 plan. Engineering and Support are under.

**Over plan**

- Design: 43,200 against 40,000, 8% over.

**Under plan**

- Engineering: 1,600 under.
- Support: 900 under.

_Illustrative workbook · Fictional data · No cell changed_

All connectors: https://corespeed.io/docs/connectors

## From a full workbook to the numbers that matter

Requests you can make once Microsoft Excel is connected. The data is fictional.

### Find the workbook

Search: budget · Workbooks you can open

- Best match: Q4 budget.xlsx
- Sheets: Summary, Teams, Vendors
- OneDrive or SharePoint

### Read the sheet

Q4 budget · Summary · Used range

- Over plan: Design, by 8%
- Under plan: Support, by 3%
- Read only · No cell changed

### Write under your rules

A new row that waits · Approval request

- Tool: Add rows to a table
- Policy: Ask before writing to a shared workbook
- Waits for a person

Full example: https://corespeed.io/solutions/agent-approvals (Markdown: https://corespeed.io/solutions/agent-approvals.md)

## Keep your agent. Bring your work

One CoreSpeed account, across compatible agents.

1. **Set up CoreSpeed**: Give your agent the setup line. It adds CoreSpeed and signs you in.
2. **Connect Microsoft Excel**: Authorize the account and the content you need.
3. **Start with one task**: Ask for a summary, a brief, or a draft. Review the answer.

Setup guides: Claude Code https://corespeed.io/docs/mcp#claude-code · Codex https://corespeed.io/docs/mcp#codex · Cursor https://corespeed.io/docs/mcp#cursor

## Questions

### Which Excel files does this work with?

Workbooks in the .xlsx format, stored in OneDrive or SharePoint. Older .xls files and files only on your computer are not supported.

### Can my agent change formulas or values?

Yes, when you ask. Writing a range can set values, formulas or number formats. It is a separate call that approvals can hold for a person. How approvals work: https://corespeed.io/solutions/agent-approvals

### Does it work with a personal Microsoft account?

Partly. Microsoft supports some workbook calls, such as reading a sheet's used range, only for work or school accounts.

### Do I have to switch agents?

No. CoreSpeed adds tools to the agent you already use: Claude Code, Codex, Cursor, or another MCP client. Each one signs in once.

### Can my agent access every account in our organization?

No. Access follows your CoreSpeed identity, each connection's visibility, and the app's own permissions. Personal connections stay private.

### Does this work without connecting an account?

No. Connect the app's account first; your CoreSpeed workspace shows what each app needs. The examples on this page use fictional data. All connectors: https://corespeed.io/docs/connectors

Every tool and price: https://corespeed.io/catalog/excel

## Related pages

- [Approval gates for AI agent tool actions](https://corespeed.io/solutions/agent-approvals): Set approval policies for writes through CoreSpeed. Review held tool actions while your team keeps using its preferred agents.
- [OneDrive for Claude Code, Codex, and Cursor](https://corespeed.io/integrations/onedrive): Find a file in OneDrive, read its text, and turn it into a brief inside the agent you already use.
- [SharePoint for Claude Code, Codex, and Cursor](https://corespeed.io/integrations/sharepoint): Find a SharePoint site, read its lists, and turn a request tracker into a status brief inside the agent you already use.

## Sources

- Connectors: https://corespeed.io/docs/connectors
- Microsoft Graph: Excel workbooks: https://learn.microsoft.com/en-us/graph/excel-concept-overview
- Microsoft Graph: worksheet used range: https://learn.microsoft.com/en-us/graph/api/worksheet-usedrange

Reviewed 2026-11-10.

## Links

- Product overview: https://corespeed.io/ (Markdown: https://corespeed.io/index.md)
- All integrations: https://corespeed.io/integrations (Markdown: https://corespeed.io/integrations.md)
- Documentation: https://corespeed.io/docs
- Pricing: https://corespeed.io/pricing (Markdown: https://corespeed.io/pricing.md)