csv-to-xlsx

A spreadsheet helper that changes CSV files into formatted XLSX workbooks. CSV is plain text arranged in rows and columns; XLSX is the file format used by Excel and many spreadsheet apps.

In plain words
What is it for?
Use it to convert comma-, semicolon-, tab-, or other single-character-delimited CSV files into workbooks with one sheet per input file.
Why use it?
It saves you from manually formatting headers, sizing columns, freezing the top row, and choosing how the CSV is separated into fields.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/sayed3li97/skillscore/spreadsheet-skill
Any agent
npx skills add sayed3li97/skillscore --skill spreadsheet-skill
Clone the repo
git clone --depth 1 https://github.com/sayed3li97/skillscore

Made for: Claude Code, Codex.

Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 182 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00025 $0.00182
Opus 5 $0.00013 $0.00091
Sonnet 5 $0.00005 $0.00036
Haiku 4.5 $0.00003 $0.00018

Measured 2d ago against content hash 73501fe90f53, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

csv-to-xlsx scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

test/fixtures/mediocre/spreadsheet-skill/SKILL.md · 30 lines

What it actually says

CSV to XLSX converter

CSV is a widely used data format. This skill turns CSV input into styled XLSX workbooks.

Workflow

  1. Read the CSV input and detect the delimiter.
  2. Create a workbook and write the header row in bold.
  3. Freeze the top pane and auto-size the columns.
  4. Save the workbook next to the source file.

For the delimiter you can use a comma, or a semicolon, or a tab, or any single character the source uses.

name,amount,date
Widgets,120,2031-01-15

The output keeps one sheet per input file and uses the file name as the sheet name.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 30 lines · 25 tokens per session scan A 73501fe90f53

Subscribe to this mod's changes

csv-to-xlsx is a skill published in the GitHub repository sayed3li97/skillscore (4 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 25 tokens to every session and 182 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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