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MCP Spreadsheet in Claude.ai and Claude Desktop connectors

Read, query, edit and convert xlsx and csv files safely. It opens xlsx, xlsm, xlsb, ods, csv and tsv, guesses the header row on a messy export, and queries with an expression language that has no eval.

The file never touches your disk: it is read from wherever the connector fetched it and any output comes back as a one-hour download link, since a hosted call has nowhere local to write to.

What you get

You say	Tool
Open sales.xlsx and tell me what's in it.	`sheet_info`
Which rep sold the most units in the North region? Top 5 with totals.	`sheet_query`
Add a Revenue column that's Units times Unit Price, save it as a CSV next to the original.	`sheet_add_column`

The group-by ranking above used to cost five tool calls and 71 seconds via a python fallback. It is one sheet_query call here.

Connect it, no install

https://mcp.zovo.one/mcp/connect mints an anonymous token and prints a URL per server, including this one, shaped like https://mcp.zovo.one/mcp/spreadsheet/t/<token>. That URL works with no headers: the token is in the path, not in an Authorization field this form does not have.

Open https://mcp.zovo.one/mcp/connect and copy the URL printed for MCP Spreadsheet.
There is no config file here: the Add custom connector form asks for a name and a Remote MCP server URL, with an Advanced settings section for an optional OAuth Client ID and Client Secret.
Paste the URL as the Remote MCP server URL. Leave the optional OAuth Client ID and Client Secret blank; this endpoint does not use them.
Click Connect, then turn the connector on for a conversation from the + button, Connectors.

Idle anonymous tokens are swept after 30 days. Since this route has no filesystem, a file MCP Spreadsheet generates comes back as a download link that expires after one hour. A Pro key can replace the token in the same URL and removes the free-tier limits.

Claude.ai and Claude Desktop connectors notes worth knowing first

On an individual Pro or Max plan you add the connector yourself from Customize, Connectors. On Team and Enterprise it is the other way round: only an Owner or Primary Owner can add a custom connector, at Organization settings, Connectors, and members then connect to what the Owner added rather than pasting their own URL.

Free: read, query, stats and find up to 5,000 rows; writes up to 500 rows, never partial. Pro is $19 once, verified offline, and binds to the token after checkout.

Questions

Does this need OAuth?

No. Add custom connector offers an Advanced settings section with an OAuth Client ID and Client Secret, but the connect-by-URL route does not use it. Leave both blank: the token in the URL path is what authenticates.

I am on a Team or Enterprise plan and cannot add a connector.

That is documented, not a bug: on Team and Enterprise, only an Owner or Primary Owner can add a custom connector, at Organization settings, Connectors, Add, Custom, Web. After that, members connect to the URL the Owner added from Customize, Connectors.

Can I use my Pro key instead of the free anonymous token?

Yes. The token segment of the URL from /mcp/connect can be replaced with a Pro key, which removes the free-tier limits on MCP Spreadsheet for that connector.

Why did a generated file come back as a link instead of opening?

The connector runs server-side with no filesystem of its own, so any file MCP Spreadsheet produces is handed back as a download link that expires after one hour, rather than a path on disk.

MCP Spreadsheet in detail · How connect-by-URL works · Every server for Claude.ai and Claude Desktop connectors · All clients · Claude.ai and Claude Desktop connectors docs