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formulon-mcp

formulon-mcp

by libraz
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formulon-mcp

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A local stdio MCP server for Formulon. Agents can inspect and edit Excel workbooks, recalculate formulas, author printable documents, preview ranges, audit copied formulas, and create native Tables and PivotTables.

Full documentation lives on the Formulon website. It covers tool inputs, responses, limits, and end-to-end examples.

Quick start

Requires Node.js 22 or newer; see engines. Register the server with the bundled interactive installer:

npx -y @libraz/formulon-mcp init

Choose Claude Code, Codex CLI, or Claude Desktop, then the Excel locale and host (Windows or Mac) that new sessions evaluate with. The locale sets number and date text, TEXT formats, text comparison, and double-byte text functions; it defaults to the system locale. Review the configuration changes and restart the client. Ask the agent to evaluate =SUM(10,20,30) using Formulon; the result is 60.

For scripted setup, pass the profile directly, for example init --profile win-365-ja_JP. A single session can still pick another profile when it is opened.

See installation for manual client configuration, local checkouts, and troubleshooting. Remove registration with npx -y @libraz/formulon-mcp uninstall.

Related MCP server: SheetForge MCP

Guides

Task

Documentation

Edit a workbook template and save a copy

Workbook workflow

Create an invoice with formulas and print settings

Document authoring

Reproduce a form and inspect its appearance

Layout and previews

Find overwritten or missing formulas

Formula audit

Summarize sales data

Tables and pivots

Inspect tool inputs or discover a low-level method

Tools · Advanced API

Sessions live in memory and disappear when the server stops. Use explicit output paths and review load/save diagnostics. Preview rendering is approximate; formula audits report review candidates. See the security model.

Development

yarn install
yarn run check
yarn test

Tests build and exercise dist/. The calculation engine is maintained in the separate Formulon repository.

License

Apache-2.0. See LICENSE.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

Loading tool schema changelog…

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