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 skills add sbroenne/mcp-server-excel --skill excel-cligit clone --depth 1 https://github.com/sbroenne/mcp-server-excelWrote 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/sbroenne/mcp-server-excel/excel-cli)<a href="https://agentmods.dev/skills/sbroenne/mcp-server-excel/excel-cli"><img src="https://agentmods.dev/badge/skills/sbroenne/mcp-server-excel/excel-cli/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.
<a href="https://agentmods.dev/skills/sbroenne/mcp-server-excel/excel-cli"><img src="https://agentmods.dev/badge/skills/sbroenne/mcp-server-excel/excel-cli.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
- NVIDIA SkillSpector pass
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 | $0.00058 | $0.00406 |
| Opus 5.5 | $0.00023 | $0.00162 |
| Sonnet 5.5 | $0.00012 | $0.00081 |
| Haiku 4.5 | $0.00006 | $0.00041 |
Grade A, and why
excel-cli 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 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.
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
Excel CLI discovery
The plugin does not place excelcli on PATH. Its launcher runs
npx -y @sbroenne/excelcli@latest; do not assume a standalone executable is
installed or restore the retired GitHub-release downloader.
For the plugin-bundled copy of this skill, ..\..\bin\start-cli.ps1 relative to
the directory containing this SKILL.md locates the plugin launcher.
Replace <plugin-root> below with that plugin's actual installed directory:
Run these commands in PowerShell 7.4 or later (pwsh), not Windows PowerShell 5.1.
& "<plugin-root>\bin\start-cli.ps1" --help
& "<plugin-root>\bin\start-cli.ps1" session --help
Use the same full launcher path for subsequent commands, especially quoted JSON
arguments. Discover exact command names, flags, defaults,
and save/close behavior through native --help; do not invent syntax.
Inspect the existing workbook state relevant to the request. Preserve unrelated
contents and save only the authorized result. If an operation fails, inspect its
reported partial state rather than assuming rollback or automatically cleaning up.
For JSON errors, read errorMessage as the single error-text field; use
errorCategory when present to guide recovery.
Load excel-cli-report-formatting only for requested report presentation, not
ordinary Excel reads or targeted updates.
What ships with it
27 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.
- README.md 3.6 KB
- references/analysis.md 2.4 KB
- references/anti-patterns.md 12 KB
- references/behavioral-rules.md 16 KB
- references/chart.md 8.1 KB
- references/cli-commands.md 75 KB
- references/conditionalformat.md 8.6 KB
- references/dashboard.md 5.4 KB
- references/datamodel.md 12 KB
- references/dmv-reference.md 2.9 KB
- references/drawing.md 2.3 KB
- references/excel_agent_mode.md 6.0 KB
- references/gotchas.md 7.1 KB
- references/m-code-syntax.md 1.3 KB
- references/pivottable.md 7.6 KB
- references/powerquery.md 9.1 KB
- references/querytable.md 2.6 KB
- references/range.md 9.0 KB
- references/README.md 875 B
- references/screenshot.md 5.5 KB
- references/slicer.md 3.8 KB
- references/table.md 5.2 KB
- references/window.md 5.5 KB
- references/workbook.md 2.2 KB
- references/workflows.md 2.6 KB
- references/worksheet.md 4.0 KB
- references/xmlmap.md 2.1 KB
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 Changed · +1 lines 27ab25a98f7f
- 5d ago Changed · -4 lines f31cdf01f041
- 13d ago Changed · -177 lines · -56 tokens per session 6e18d5ac73bd
- 19d ago Changed 3c653c9db5b1
- 1mo ago First seen · 218 lines · 114 tokens per session scan A acee04e670dd
excel-cli is a skill published in the GitHub repository sbroenne/mcp-server-excel (827 stars, last pushed today), licensed MIT. It adds 58 tokens to every session and 406 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.
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