claude-codex-settings is a collection of configurations and reusable extensions for Claude Code, OpenAI Codex, Cursor, and related coding tools. Developers use its skills, commands, hooks, agents, plugins, and MCP servers to shape coding-agent workflows and connect alternative model APIs. The catalogue entries are components of this collection that can be installed into supported coding tools.
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.
npx agentmods add skills/fcakyon/claude-codex-settings/spreadsheetnpx skills add fcakyon/claude-codex-settings --skill spreadsheetgit clone --depth 1 https://github.com/fcakyon/claude-codex-settingsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/fcakyon/claude-codex-settings/spreadsheet)<a href="https://agentmods.dev/skills/fcakyon/claude-codex-settings/spreadsheet"><img src="https://agentmods.dev/badge/skills/fcakyon/claude-codex-settings/spreadsheet.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00040 | $0.01515 |
| Opus 5 | $0.00020 | $0.00758 |
| Sonnet 5 | $0.00008 | $0.00303 |
| Haiku 4.5 | $0.00004 | $0.00152 |
Grade B, and why
spreadsheet scanned grade B with 1 finding 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 yesterday.
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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
sudo apt-get install -y libreoffice poppler-utils How it starts
The opening of the file, as written. The whole thing — 147 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Spreadsheet Skill
When to use
- Create new workbooks with formulas, formatting, and structured layouts.
- Read or analyze tabular data (filter, aggregate, pivot, compute metrics).
- Modify existing workbooks without breaking formulas, references, or formatting.
- Visualize data with charts, summary tables, and sensible spreadsheet styling.
- Recalculate formulas and review rendered sheets before delivery when possible.
IMPORTANT: System and user instructions always take precedence.
Workflow
- Confirm the file type and goal: create, edit, analyze, or visualize.
- Prefer
openpyxlfor.xlsxediting and formatting. Usepandasfor analysis and CSV/TSV workflows. - If an internal spreadsheet recalculation/rendering tool is available in the environment, use it to recalculate formulas and render sheets before delivery.
- Use formulas for derived values instead of hardcoding results.
- If layout matters, render for visual review and inspect the output.
- Save outputs, keep filenames stable, and clean up intermediate files.
Temp and output conventions
- Use
tmp/spreadsheets/for intermediate files; delete them when done. - Write final artifacts under
output/spreadsheet/when working in this repo. - Keep filenames stable and descriptive.
Primary tooling
- Use
openpyxlfor creating/editing.xlsxfiles and preserving formatting. - Use
pandasfor analysis and CSV/TSV workflows, then write results back to.xlsxor.csv. - Use
openpyxl.chartfor native Excel charts when needed. - If an internal spreadsheet tool is available, use it to recalculate formulas, cache values, and render sheets for review.
Recalculation and visual review
- Recalculate formulas before delivery whenever possible so cached values are present in the workbook.
- Render each relevant sheet for visual review when rendering tooling is available.
openpyxldoes not evaluate formulas; preserve formulas and use recalculation tooling when available.- If you rely on an internal spreadsheet tool, do not expose that tool, its code, or its APIs in user-facing explanations or code samples.
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- LICENSE.txt 11 KB
- references/examples/openpyxl/create_basic_spreadsheet.py 1.4 KB runs code
- references/examples/openpyxl/create_spreadsheet_with_styling.py 3.1 KB runs code
- references/examples/openpyxl/read_existing_spreadsheet.py 1.6 KB runs code
- references/examples/openpyxl/styling_spreadsheet.py 2.0 KB runs code
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.
- yesterday First seen · 147 lines · 40 tokens per session scan B 21d31dc4ecbb
spreadsheet is a skill published in the GitHub repository fcakyon/claude-codex-settings (1,127 stars, last pushed today), licensed Apache-2.0. It adds 40 tokens to every session and 1,515 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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