forecast-model
Builds a forecasting model structure by selecting the method (moving average, linear trend, seasonal decomposition) based on data characteristics, specifying formula steps, and producing a confidence interval template. Outputs a complete forecast specification with calculations. Use when the user asks to forecast sales, predict demand, project revenue, estimate future values from historical data, or build a trend projection. Do NOT use for business financial modeling with multiple assumptions (use financial-model-template in spreadsheets), metric hierarchy design (use metric-framework), or A/B test statistical analysis (use ab-test-design).