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Numera MCP

Numera MCP

by vectojs
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

Numera MCP

@vectojs/numera-mcp is the safe local-first Model Context Protocol adapter for Numera workbooks. It lets an MCP client inspect workbooks, read bounded ranges, and write validated cell batches without launching a browser or subprocess. The published stdio executable requires Bun.

The server supports .numera.json, .json, .csv, and .xlsx files through exact-pinned Numera Core and XLSX packages. It is intentionally local and does not provide collaboration, accounts, cloud storage, or remote network access.

Run

numera-mcp --root /absolute/path/to/workbooks

The server uses stdio. Paths passed to tools are relative to --root. Mutation tools require an expected input SHA-256 and a distinct, non-existing output path, so a stale Agent cannot silently overwrite newer work.

Related MCP server: Office MCP Server

Tools

  • numera_inspect_workbook: return the format, SHA-256, active sheet, sheet dimensions, populated-cell count, and used range.

  • numera_read_range: return raw and display values for at most 10,000 cells.

  • numera_write_cells: validate and atomically apply 1–1,000 typed cell writes to a new output workbook.

Development

bun install
bun run verify
npm pack --dry-run

Security

See SECURITY.md. Numera MCP treats workbook bytes, formulas, paths, and MCP arguments as untrusted input.

Tool Schema Changelog

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

Loading tool schema changelog…

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    Maintenance

    ActivityInactive
    ResponsivenessNo recent community issues

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