The DAX language, agent-native: 479 function cards, 34 conceptual pages, hand-written field notes, the daxlib.org catalogue, UDF authoring and the window family.
Not performance tuning.
Skills 5 in the Claude listing
Dax lib Use when about to write a DAX UDF, to check whether one is already published on DAX Lib (daxlib.org) — moving averages, format strings, SVG visuals, KPI/variance, RFM/ABC classification, unit conversi Dax lib install Use when installing a DAX UDF from daxlib.org into a live model or PBIP folder after dax-lib found it. Dax reference Use when you need what a built-in DAX function does — signature, return type, where it is legal (measure, calculated column or table, visual calculation), whether it is discouraged or deprecated, or w Dax udf authoring Use when writing your own DAX user-defined function (FUNCTION) — parameter types (AnyRef, ColumnRef, MeasureRef, CalendarRef), VAL vs EXPR, TABLEOF/NAMEOF, optional parameters, naming, and known parse Dax window functions Use when writing a DAX measure with WINDOW, OFFSET, INDEX, RANK, ROWNUMBER, MOVINGAVERAGE or RUNNINGSUM (ORDERBY/PARTITIONBY/MATCHBY) — rolling averages, running totals, prior-period rows, ranking wit