What is spreadsheets?

A skill for working with CSV, TSV, and Excel spreadsheets, including inspecting, transforming, validating, and creating them. These are table files commonly used for structured data.

Use it when a spreadsheet is the main input or output, such as cleaning rows, checking formulas, converting formats, or creating a new text table.

It helps preserve exact values, formulas, formatting, and safe handling when spreadsheet data is changed.

spreadsheets — Skill for Claude Code and Codex by PaulRBerg

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.

Any agent

npx skills add PaulRBerg/agent-skills --skill spreadsheets

Clone the repo

git clone --depth 1 https://github.com/PaulRBerg/agent-skills

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/paulrberg/agent-skills/spreadsheets/github.svg)](https://agentmods.dev/skills/paulrberg/agent-skills/spreadsheets)

Your own site

<a href="https://agentmods.dev/skills/paulrberg/agent-skills/spreadsheets"><img src="https://agentmods.dev/badge/skills/paulrberg/agent-skills/spreadsheets/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/paulrberg/agent-skills/spreadsheets"><img src="https://agentmods.dev/badge/skills/paulrberg/agent-skills/spreadsheets.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,277 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00057	$0.01277
Opus 5.5	$0.00023	$0.00511
Sonnet 5.5	$0.00011	$0.00255
Haiku 4.5	$0.00006	$0.00128

Measured 1mo ago against content hash 7eed644d4c60, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

spreadsheets 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 1mo ago.

The scan reads SKILL.md. This mod also ships 3 executable files (scripts/peek.py, scripts/profile.py, scripts/recalc.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/spreadsheets/SKILL.md · 96 lines

How it starts

The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Spreadsheets

Handle tabular data with exact values, minimal diffs, recipient-scoped data handling, atomic writes, and structural validation.

Invariants

Keep precision-sensitive amounts as strings and compute with decimal.Decimal or DuckDB DECIMAL(38, 18), never binary floats.
Touch only requested rows, columns, formulas, and formatting. Existing file conventions override house defaults.
For newly authored text tables, prefer TSV, UTF-8 without BOM, LF, one trailing newline, lowercase snake_case headers, ISO dates, . decimals, and - nulls.
Read unknown text tables with BOM-tolerant UTF-8. Never write a BOM.
Write in place atomically through a sibling temporary file, validate it, then replace the target.
Escape external cells beginning with =, +, or @. A bare - null is exempt. Formula-prefix cells in trusted authored data are observations, not proof of injection.
Treat transaction, bank, exchange, and tax data as user-owned. Use unredacted samples in internal agent reports when materially useful. For public or third-party disclosures, or when the user asks, use --redact-samples.

Factual Profiling

Resolve helper paths from this SKILL.md. Profile unknown data before choosing a transformation tool:

uv run "<skill-dir>/scripts/profile.py" <file>

The JSON output has schema_version: 2. It reports structural facts, header quality, cardinality/statistics when qsv is available, frequency facts, formula-prefix cells, workbook metadata, and local tool availability. It contains no tool recommendations and does not infer identifiers from uniqueness. Choose the tool from the requested transformation, provenance, output format, and preservation requirements.

Use --external-data only when the cells came from an external or otherwise untrusted source and will be written to a formula-capable consumer. With that flag, formula-prefix cells affect status. Without it, legitimate formulas such as =SUM(...) remain factual observations and do not fail the profile.

Read the full file on GitHub · 96 lines

Files

What ships with it

7 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.

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.

1mo ago Changed 7eed644d4c60
2mo ago First seen · 96 lines · 57 tokens per session scan A 62f01484436b

Subscribe to this mod's changes

spreadsheets is a skill published in the GitHub repository PaulRBerg/agent-skills (104 stars, last pushed 2d ago), licensed MIT. It adds 57 tokens to every session and 1,277 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-30.

Documents Spreadsheets agent-skills ai-agents

spreadsheets next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
spreadsheetsPaulRBerg/agent-skills	Skill	104	2d ago	MIT	A	57	Claude Code, Codex
dcf-modelNousResearch/hermes-agent	Skill	262k	today	MIT	A	14	Claude Code, Codex
gogopenclaw/openclaw	Skill	394k	today	MIT	A	20	Claude Code, Codex
xlsxasgeirtj/system_prompts_leaks	Skill	71k	today	CC0-1.0	A	206	Claude Code, Codex
audit-xlsanthropics/financial-services	Skill	41k	11d ago	Apache-2.0	A	104	Claude Code
artifact-template-analytics-dashboardasgeirtj/system_prompts_leaks	Skill	71k	today	CC0-1.0	A	47	Claude Code, Codex
google-drive-sheetsyc-software/qm	Skill	16k	today	MIT	A	32	Claude Code, Codex