CSV & Data Wrangling Toolkit

Complete toolkit for processing tabular data using standard Unix tools and Python standard library. Covers the full data wrangling workflow: inspect and preview files, filter and sort rows, select and reorder columns, aggregate and summarize with group-by, join and merge multiple files, deduplicate records, validate data quality, convert between CSV/TSV/JSON/NDJSON, build pivot tables, handle quoted fields safely, process large files with streaming, and build ETL pipelines. Every command works on any Unix system with no pip installs or external dependencies. Includes Miller (mlr) recipes for teams that want a power tool. Whether you are cleaning API exports, preparing data for dashboards, or building automated data pipelines, this skill gives your agent the exact commands to get it done.