Borrowing it
Nothing to install: this file belongs to sumup/sumup-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/sumup/sumup-skills/main/GEMINI.mdgit clone --depth 1 https://github.com/sumup/sumup-skillsWrote 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/instructions/sumup/sumup-skills/gemini-md)<a href="https://agentmods.dev/instructions/sumup/sumup-skills/gemini-md"><img src="https://agentmods.dev/badge/instructions/sumup/sumup-skills/gemini-md/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/instructions/sumup/sumup-skills/gemini-md"><img src="https://agentmods.dev/badge/instructions/sumup/sumup-skills/gemini-md.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00361 | $0.00361 |
| Opus 5.5 | $0.00144 | $0.00144 |
| Sonnet 5.5 | $0.00072 | $0.00072 |
| Haiku 4.5 | $0.00036 | $0.00036 |
Grade A, and why
sumup-skills GEMINI.md 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.
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
SumUp for Gemini CLI
This extension provides guidance for building SumUp payment integrations.
Use the bundled skills under skills/ when a request involves SumUp:
- SumUp checkout creation and payment processing
- Terminal and tap-to-pay flows
- Reader pairing and reader checkouts
- Card Widget, Hosted Checkout, and Checkouts API integrations
- Cloud API, SDK, API key, OAuth, or Affiliate Key setup
- Webhooks, 3DS flows, and payment status handling
Prefer these entry points:
- skills/sumup/SKILL.md for implementation.
- skills/sumup-best-practices/SKILL.md for integration choices and security posture.
- skills/sumup-debug/SKILL.md for troubleshooting.
- skills/sumup-mcp/SKILL.md for SumUp MCP setup and use.
- skills/sumup-testing/SKILL.md for sandbox and end-to-end testing.
- skills/upgrade-sumup/SKILL.md for SDK and API upgrades.
Use the references under skills/sumup/references/ for the relevant platform or integration surface.
The extension configures the sumup MCP server at https://mcp.sumup.com/mcp. Use read-only or low-impact tool calls for the first verification step, and guide the user through authentication if the server requests it.
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 First seen · 26 lines · 361 tokens per session scan A 205d331e2b18
sumup-skills GEMINI.md is an instructions file published in the GitHub repository sumup/sumup-skills (5 stars, last pushed yesterday), licensed Apache-2.0. It adds 361 tokens to every session, about $0.0014 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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