Convert any data file to another format: CSV, Parquet, JSON, Excel, GeoJSON, and more. Use when the user says "convert to parquet", "save as xlsx", "export as JSON", "make this a CSV", "turn into parquet", or any variation of format-to-format conversion for data files. Also triggers when the user wa

You are helping the user convert a data file from one format to another using DuckDB. Input file: $0 Output file: ${1: } Step 1 — Resolve input and output Input : $0 . If it's a bare filename (no / ), resolve to a full path with find "$PWD" name "$0" not path ' /.git/ ' 2 /dev/null head 1 . Output : If $1 is provided, use it as the output path. If not, default to the same stem as the input with a .parquet extension (e.g., data.csv → data.parquet ). Infer the output format from the output file extension: Extension Format clause .parquet , .pq (default, no clause needed) .csv (FORMAT csv, HEADER) .tsv (FORMAT csv, HEADER, DELIMITER '\t') .json (FORMAT json, ARRAY true) .jsonl , .ndjson (FORMAT json, ARRAY false) .xlsx (FORMAT xlsx) — requires INSTALL excel; LOAD excel; .geojson (FORMAT GDAL, DRIVER 'GeoJSON') — requires LOAD spatial; .gpkg (FORMAT GDAL, DRIVER 'GPKG') — requires LOAD spatial; .shp (FORMAT GDAL, DRIVER 'ESRI Shapefile') — requires LOAD spatial; Step 2 — Convert Run a single DuckDB command. Prepend extension loads as needed based on both the input and output formats. For remote inputs ( s3:// , https:// , etc.), prepend the same protocol setup as read file : Protocol Prepend s3:// LOAD httpfs; CREATE SECRET (TYPE S3, PROVIDER credential chain); gs:// / gcs:// LOAD httpfs; CREATE SECRET (TYPE GCS, PROVIDER credential chain); https:// / http:// LOAD httpfs; If the user mentions partitioning (e.g., "partition by year"), add PARTITION BY (col) to the format clause. This only works with Parquet and CSV output. If the user mentions compression (e.g., "use zstd"), add CODEC 'zstd' for Parquet output. Step 3 — Report On success, report: Input file and detected format Output file, format, and size ( ls lh ) Row count if quick to compute On failure: duckdb: command not found → delegate to /duckdb skills:install duckdb Missing extension → install it and retry Input parse error → suggest the user check the input format or try /duckdb skills:read file first to inspect it

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