bilig turns spreadsheet logic into a backend artifact.

A lot of products still have pricing rules, payout checks, import validation, quota plans, and finance models living in spreadsheets. The painful part is not the formulas; it is driving Excel or a browser UI just to change a few inputs and prove the result.

@bilig/headless gives you a WorkPaper runtime for Node.js:

• create a workbook from tables or persisted JSON
• set cell contents through an API
• recalculate formulas
• read display values back
• save and restore the WorkPaper document
• expose the same workflow to agents through bilig-workpaper-mcp

It is useful when you want spreadsheet-style business logic to stay reviewable as cells and formulas, but you need it to run in services, background jobs, serverless functions, or local agent tools.

Quick check:

npm exec --package @bilig/headless -- bilig-formula-clinic --help

MCP for agents:

npm exec --package @bilig/headless -- bilig-workpaper-mcp --workpaper ./pricing.workpaper.json --init-demo-workpaper --writable

Use it for quote calculators, budget variance checks, payout rules, workbook import validation, and any agent workflow where "I updated the spreadsheet" is not enough; you need read-after-write proof.

It is not trying to be a full Excel clone. The useful slice is narrower: formula workbooks that a backend service or agent can edit, recalculate, inspect, and persist without screen scraping.