MCP

Everything an agent can do here goes through one MCP server: 9 tools, about 2,500 tokens of definitions, Streamable HTTP, spec 2026-07-28. Signing in is optional. Without it, tools operate on anonymous workbooks; with it, they use your workspace and can manage webhooks and folders.

Endpoint:

Claude.ai and Claude Desktop

Open Settings, then Connectors.
Choose Add custom connector.
Paste the endpoint:

Either authentication mode works. "Always required" signs you in through the browser consent flow; "None" uses anonymous workbooks.

Claude Code

terminal

claude mcp add --transport http sheets-fast https://sheets.fast/mcp

Run it once; every future session has the tools.

ChatGPT

Open Settings, then Connectors, and enable developer mode under Advanced.
Choose Create, name it sheets.fast, and paste the endpoint above.
OAuth is discovered automatically; no client registration needed.

Cursor

Add to Cursor with one click, or add it to your MCP config by hand:

~/.cursor/mcp.json

{
  "mcpServers": {
    "sheets-fast": { "url": "https://sheets.fast/mcp" }
  }
}

Any other MCP client

The same Streamable HTTP endpoint works everywhere. The generic config shape:

mcp config

{
  "mcpServers": {
    "sheets-fast": { "url": "https://sheets.fast/mcp" }
  }
}

Tools

Tool	What it does
workbook_create	New workbook (or duplicate one via clone_of); returns id and URL
workbook_describe	Metadata, sheets, SQL schema, and each sheet's used_range
workbook_list	Your workspace's workbooks (needs auth)
workbook_update	Rename, describe, move to a folder, restructure sheets, or delete
sheet_read	Ranged read; compact CSV output; styles on request
sheet_query	Read-only DuckDB SQL; every sheet is a table
sheet_write	Bulk writes, append, drag-fill, clear, formatting
webhook_manage	Create, list, delete, test row-event webhooks (needs auth)

A good first session

workbook_create, then share the returned URL with your human.
sheet_write data and formulas; workbook_describe before touching an unfamiliar workbook.
sheet_query to answer questions about the data in one call.