Excel

When to Use This Skill

• User mentions a .xlsx or .xls file and wants to read, inspect, or modify it
• Spreadsheet operations: read cells/ranges, write values, search content
• Workbook structure: list sheets, add/delete/rename/copy sheets
• Column/row manipulation: add, delete, rename columns; add, delete rows
• Styling: bold, colors, alignment, borders, merge/unmerge cells
• Import/export: CSV to/from Excel conversion
• Creating new workbooks from scratch

> Format support: natively handles .xlsx, .xlsm, .xltx, .xltm (Excel 2010+). Legacy .xls (Excel 97-2003) is also supported — the script auto-converts it to .xlsx via xls2xlsx before processing. Write operations on .xls source files always output .xlsx.

Prerequisites

• openpyxl — install with: pip install openpyxl
• xls2xlsx (optional) — needed only for .xls files: pip install xls2xlsx or pip install mythril-agent-skills[xls]

Pre-flight check:

python3 -c "import openpyxl; print(openpyxl.__version__)"
# Optional: check xls support
python3 -c "from xls2xlsx import XLS2XLSX; print('xls2xlsx OK')"

Safe-Save Behavior

All write operations save to a timestamped copy by default (e.g. report_modified_20260327_143022.xlsx), preserving the original file. This prevents accidental data loss.

• Default: report.xlsx -> report_modified_20260327_143022.xlsx
• With --in-place (-i): overwrites report.xlsx directly

Use --in-place only when the user explicitly asks to modify the original file. When chaining multiple write operations, use --in-place on the first command's output for subsequent steps, or pass --in-place on all if the user wants all changes on the original.

Workflow

1. Determine what the user wants (read, write, search, restructure, style, convert)
2. Run the appropriate script subcommand
3. Read the output (markdown table or confirmation) and present it to the user
4. For multi-step tasks, chain subcommands in sequence

All commands use:

python3 scripts/excel_ops.py  [options] 

The script path is relative to this skill directory.

Command Reference

Inspect workbook

python3 scripts/excel_ops.py info report.xlsx

Shows all sheets with dimensions, row/column counts, and column headers (row 1 values).

Read data

# Read entire active sheet as markdown table (first row = header)
python3 scripts/excel_ops.py read report.xlsx --header

# Read a specific range
python3 scripts/excel_ops.py read report.xlsx --range A1:D20 --header

# Read a specific sheet
python3 scripts/excel_ops.py read report.xlsx --sheet "Sales" --header

# Read first 50 rows
python3 scripts/excel_ops.py read report.xlsx --header --limit 50

# Read as JSON (useful for programmatic processing)
python3 scripts/excel_ops.py read report.xlsx --header --format json

Search

# Case-insensitive search across all sheets
python3 scripts/excel_ops.py search report.xlsx "revenue"

# Exact match in one sheet
python3 scripts/excel_ops.py search report.xlsx "Q4 2024" --sheet "Sales" --exact

# Limit results
python3 scripts/excel_ops.py search report.xlsx "error" --limit 20

Write cells

# Write individual cells (auto-detects numbers, booleans, formulas)
python3 scripts/excel_ops.py write report.xlsx A1=Name B1=Revenue C1=Margin

# Write to a specific sheet, in place
python3 scripts/excel_ops.py write report.xlsx --sheet "Summary" --in-place A1="Total" B1=42000

# Write a formula
python3 scripts/excel_ops.py write report.xlsx C2="=B2/A2*100"

Write bulk data

# Write a JSON array of objects (with headers)
python3 scripts/excel_ops.py write-range report.xlsx \
  '[{"Name":"Alice","Score":95},{"Name":"Bob","Score":87}]' --header

# Write a JSON array of arrays starting at a specific position
python3 scripts/excel_ops.py write-range report.xlsx \
  '[["Q1",1000],["Q2",1200]]' --start-row 5 --start-col C

Create workbook

# Create empty workbook
python3 scripts/excel_ops.py create new_report.xlsx

# Create with named sheets
python3 scripts/excel_ops.py create new_report.xlsx --sheets "Data" "Summary" "Charts"

Sheet operations

python3 scripts/excel_ops.py add-sheet report.xlsx "Q4 Data"
python3 scripts/excel_ops.py add-sheet report.xlsx "Cover" --position 0
python3 scripts/excel_ops.py delete-sheet report.xlsx "Old Data"
python3 scripts/excel_ops.py rename-sheet report.xlsx "Sheet1" "Revenue"
python3 scripts/excel_ops.py copy-sheet report.xlsx "Template" --name "January"

Column operations

# Add column at end
python3 scripts/excel_ops.py add-column report.xlsx "Profit Margin"

# Insert at position B with default value
python3 scripts/excel_ops.py add-column report.xlsx "Category" --position B --default "Uncategorized"

# Delete / rename
python3 scripts/excel_ops.py delete-column report.xlsx C
python3 scripts/excel_ops.py rename-column report.xlsx B "New Header"

Row operations

python3 scripts/excel_ops.py add-row report.xlsx --values "Alice" 95 "A"
python3 scripts/excel_ops.py add-row report.xlsx --position 3 --values "Bob" 87 "B"
python3 scripts/excel_ops.py add-row report.xlsx --json '{"Name":"Carol","Score":92}'
python3 scripts/excel_ops.py delete-row report.xlsx 5 6 7

Styling

python3 scripts/excel_ops.py set-style report.xlsx A1:D1 --bold true --font-size 14
python3 scripts/excel_ops.py set-style report.xlsx A1:D1 --bg-color "#4472C4" --font-color "#FFFFFF"
python3 scripts/excel_ops.py set-style report.xlsx B2:D10 --align center --border thin
python3 scripts/excel_ops.py merge report.xlsx A1:D1
python3 scripts/excel_ops.py unmerge report.xlsx A1:D1

Layout

python3 scripts/excel_ops.py freeze report.xlsx A2           # freeze top row
python3 scripts/excel_ops.py freeze report.xlsx NONE          # unfreeze
python3 scripts/excel_ops.py autofilter report.xlsx A1:D100
python3 scripts/excel_ops.py column-width report.xlsx A 25
python3 scripts/excel_ops.py row-height report.xlsx 1 30

CSV conversion

python3 scripts/excel_ops.py export-csv report.xlsx --output data.csv
python3 scripts/excel_ops.py export-csv report.xlsx --sheet "Sales" --output sales.csv
python3 scripts/excel_ops.py import-csv report.xlsx data.csv
python3 scripts/excel_ops.py import-csv report.xlsx data.tsv --delimiter "\t"

Composing Multi-Step Workflows

The commands above are building blocks. Combine them to accomplish complex user requests. Examples:

"Add a profit margin column calculated from revenue and cost":

1. info to identify which columns contain revenue and cost
2. add-column to add "Profit Margin" header
3. write to fill formulas like D2="=(B2-C2)/B2*100" for each data row

"Convert this CSV to a formatted Excel file":

1. import-csv the CSV into a new workbook
2. set-style the header row (bold, background color)
3. column-width for readability
4. freeze the header row
5. autofilter the data range

When chaining multiple writes on the same file, apply --in-place to avoid creating a new copy at each step — or use the first command's output path for subsequent commands.

Guidelines

• Read before write: always info or read first to understand the file structure
• Large files: use --limit when reading to avoid overwhelming output
• Auto-type conversion: the script auto-converts string inputs — 42 becomes int, 3.14 becomes float, =SUM(A:A) stays as formula, true/false become booleans

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: jie-meng
• Source: jie-meng/mythril-agent-skills
• License: Apache-2.0

Install and usage instructions live in the source repository linked above.