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/thewolffish/wolffish-app/spreadsheetnpx skills add thewolffish/wolffish-app --skill spreadsheetgit clone --depth 1 https://github.com/thewolffish/wolffish-appWrote 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/thewolffish/wolffish-app/spreadsheet)<a href="https://agentmods.dev/skills/thewolffish/wolffish-app/spreadsheet"><img src="https://agentmods.dev/badge/skills/thewolffish/wolffish-app/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 5.1 | $0.00023 | $0.02149 |
| Opus 5 | $0.00012 | $0.01074 |
| Sonnet 5 | $0.00005 | $0.00430 |
| Haiku 4.5 | $0.00002 | $0.00215 |
Grade A, and why
spreadsheet 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 6d 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.
What it actually says
Spreadsheet
Interface
- Tools:
spreadsheet_read,spreadsheet_create,spreadsheet_modify,spreadsheet_formula,spreadsheet_chart,spreadsheet_style,spreadsheet_convert,spreadsheet_analyze,spreadsheet_filter,spreadsheet_pivot - Supported formats: .xlsx, .csv, .tsv
- All complex parameters are passed as JSON strings.
- All paths must be absolute.
Rules
- Auto-detect file format from the extension.
- For CSV/TSV, handle BOM detection, quoted fields, escaped quotes, multiline values.
- Default encoding is UTF-8. Detect and handle UTF-16 and Windows-1252.
- For files > 10MB, use streaming where available.
- Hard limit: reject files > 100MB with a clear error.
- Normalize dates to ISO 8601 in output.
- Handle Excel serial date numbers correctly.
- Return structured JSON results.
- Handle EBUSY/EPERM errors gracefully (file open in another app).
Column Reference
- Columns can be referenced by letter (A, B, C...) or by header name when headers=true.
- Ranges use Excel notation: "A1:D50", "B:B" (whole column), "3:5" (whole rows).
What ships with it
2 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.
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.
- 6d ago First seen · 282 lines · 23 tokens per session scan A 99c23d1eb48e
spreadsheet is a skill published in the GitHub repository thewolffish/wolffish-app (5 stars, last pushed today), licensed MIT. It adds 23 tokens to every session and 2,149 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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