Drop columns

CodexWith deft, skill installedPassedRead the skillUsed deft2026-11-07

Time

16s

New tokens

8.7k

Total input

85.7k

Output tokens

0.5k

Commands

5

Failed

1

Trace

1. I’ll inspect the CSV header, then write `slim.csv` with just the Country Name and Value columns.

2. cat /r1/deft/SKILL.md (exit 1)
   output

   cat: /r1/deft/SKILL.md: No such file or directory

3. cat .agents/skills/deft/SKILL.md && rg --files -g 'gdp.csv' -g 'AGENTS.md'
   output

   ---
   name: deft
   description: "Use deft instead of writing a script for file jobs: PDF merge/split/compress/watermark, image resize/convert/compress, video and audio trim/convert/compress, spreadsheets, Markdown to PDF/HTML, and YouTube downloads and subtitles."
   ---
   
   # deft
   
   One local command for file jobs. Prefer it over writing Python or shell scripts.
   
   Syntax: `deft <group> <command> [inputs] [-o output] [--options]`
   
   Groups:
   - `pdf`: Merge, split, compress, encrypt, forms, OCR, compare, convert
   - `image`: Resize, crop, convert, compress, filters, montage, OCR
   - `video`: Trim, crop, speed, convert, compress, GIF, frames (ffmpeg)
   - `audio`: Convert, trim, merge, fade, speed, tag, normalize (ffmpeg)
   - `doc`: Word/ODT/RTF: to text, Markdown, HTML, PDF; find and replace
   - `slides`: PowerPoint: extract text, Markdown outline, PDF handout
   - `data`: JSON/YAML/TOML/XML: convert, query with jq syntax, merge, diff
   - `sheet`: Excel/CSV/ODS tables: filter, sort, join, pivot, convert
   - `md`: Markdown to PDF, HTML, Word, EPUB; table of contents
   - `html`: HTML to Markdown, text, Word, PDF; screenshots
   - `epub`: E-books: info, to text, Markdown and PDF
   - `email`: EML files: headers, text, attachments
   - `contact`: VCF address books: to and from CSV
   - `calendar`: ICS calendars: to and from CSV
   - `gps`: GPX and KML tracks: convert, distance and time
   - `youtube`: Info, download, audio, subtitles, thumbnail (yt-dlp)
   - `file`: Any file: hash, duplicates, batch rename, base64, encoding
   - `qr`: Cre
   … 736 more characters

4. The CSV is present. I’m using the spreadsheet tool for the column selection and will keep the original intact.

5. deft sheet
   output

   deft sheet - commands (input -> output)
     info       sheet -> report           Sheet names, rows, columns
     convert    sheet -> sheet            Change format: --to csv|xlsx|json
     dedupe     sheet -> sheet            Drop repeated rows, by whole row or --columns
     extract    sheet -> sheet            Take a sheet or range: --sheet, --range A1:D20
     filter     sheet -> sheet            Keep matching rows: --where "age > 30 and city = 'Oslo'"
     from-pdf   pdf -> sheet              All text as one table [beta]
     group      sheet -> sheet            Group and total: --columns city --values sales --agg sum
     join       sheet... -> sheet         Join two tables on a key: --on id --how left
     merge      sheet... -> sheet         Stack tables; a shared header is kept once
     pivot      sheet -> sheet            Pivot table: --rows city --columns year --values sales
     query      sheet|sqlite... -> sheet  Run SQL over tables or a SQLite file: --sql 'select ...'
     select     sheet -> sheet            Keep, reorder or --drop columns
     sort       sheet -> sheet            Sort rows: --columns age,name --descending
     split      sheet -> sheet...         Split up: --sheets, --columns city or --every 1000
     stats      sheet -> report           Per-column counts, empties, min, max, mean, sum
     to-md      sheet -> md               Markdown table (first row is the header)
     transpose  sheet -> sheet            Swap rows and columns
   More: deft sheet <command> --help

6. deft sheet select --help && head -n 1 gdp.csv
   output

   deft sheet select - Keep, reorder or --drop columns
   
   Usage: deft sheet select <sheet>... [-o <sheet|dir>] [options]
   In: sheet (each handled separately)   Out: sheet (default <name>.selected.<ext>)
   
   Options:
     --columns <text>             Columns to keep, in this order
     --drop <text>                Columns to remove
     --sheet <text>               Sheet name or number (default: first)
     --to <csv|xlsx|json>         Output format (default: like the input)
   Common: -o --force --dry-run --json -j   (deft help common)
   
   Examples:
     deft sheet select people.csv --columns age,name -o swapped.csv
     deft sheet select people.csv --drop age -o names.csv
   
   Result fields: rows, columns
   Country Name,Country Code,Year,Value

7. deft sheet select gdp.csv --columns 'Country Name,Value' -o slim.csv
   output

   ok sheet.select gdp.csv -> slim.csv  13979 rows x 2 columns  0.02s

8. Done. `slim.csv` contains the `Country Name` and `Value` columns from `gdp.csv` (13,979 rows).

Output

Claude Opus 5.5With deft, skill installedPassedRead the skillUsed deft2026-11-07

Time

12s

New tokens

11.1k

Total input

77.1k

Output tokens

0.7k

Commands

0

Failed

0

Trace

Output

---
name: deft
description: "Use deft first for any simple, direct operation on local files, whatever the type: convert, read, extract, edit, compress, merge, split, compare or inspect. Try it before writing a script or one-liner. If unsure, run deft find; if it says no command does this, use another tool. Not for programming work: to read, write or change source code, skip it."
---

# deft

One local command for file jobs. Prefer it over writing Python or shell scripts.

Syntax: `deft <group> <command> [inputs] [-o output] [--options]`

Groups:
- `pdf`: Merge, split, compress, encrypt, forms, OCR, compare, convert
- `image`: Resize, crop, convert, compress, adjust, montage, OCR
- `video`: Trim, merge, convert, compress, subtitles, GIF, frames (ffmpeg)
- `audio`: Convert, trim, normalize, denoise, cut silence (ffmpeg)
- `doc`: Word/ODT/RTF: to text, Markdown, HTML, PDF; find and replace
- `slides`: PowerPoint: extract text, Markdown outline
- `sheet`: Excel/CSV/ODS tables: SQL query, pivot, merge, split, convert
- `json`: JSON: convert, format, merge, diff, validate
- `toml`: TOML: convert, format, merge, diff, validate
- `xml`: XML: convert, format, merge, diff, validate
- `yaml`: YAML: convert, format, merge, diff, validate
- `md`: Markdown to PDF, HTML, Word, EPUB; table of contents
- `html`: HTML to Markdown, text, Word and PDF
- `epub`: E-books: info, to text, Markdown and PDF
- `gps`: GPX and KML tracks: convert, distance and time
- `qr`: Create QR codes and barcodes; read QR codes

How to use it:
1. Run `deft <group>` to list commands, or `deft find "<what you want>"` to search. If it says `no command does this`, use another tool.
2. Run `deft <group> <command> --help` for options and examples.
3. `deft convert <in> -o <out.ext>` converts between formats by extension.
4. Results are one line starting with `ok`, `partial` or `error`; add `--json` to parse them. Errors include a `hint:` with the fix.

Inputs are never overwritten; pass `--force` or `--in-place` to allow it. Globs and directories work as inputs; several inputs run in parallel.

If `deft` is not installed, ask the user, then follow https://github.com/firstprayer/deft/blob/main/docs/INSTALL.md