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 sumup/sumup-skills --skill sumup-mcpgit 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/skills/sumup/sumup-skills/sumup-mcp)<a href="https://agentmods.dev/skills/sumup/sumup-skills/sumup-mcp"><img src="https://agentmods.dev/badge/skills/sumup/sumup-skills/sumup-mcp.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 | $0.00066 | $0.00549 |
| Opus 5 | $0.00033 | $0.00275 |
| Sonnet 5 | $0.00013 | $0.00110 |
| Haiku 4.5 | $0.00007 | $0.00055 |
Grade A, and why
sumup-mcp 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 7d 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.
How it starts
The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SumUp MCP Server Guide
Use this skill when setup or usage of the SumUp MCP server is requested.
Canonical endpoint:
https://mcp.sumup.com/mcp
What this skill covers
- MCP server wiring in MCP-capable clients
- Auth handshake troubleshooting
- Prompt patterns for tool-driven SumUp API tasks
- Safe usage guardrails for production and sandbox contexts
Minimal Setup Checklist
- Add an MCP server entry named
sumup. - Set URL to
https://mcp.sumup.com/mcp. - Use streamable HTTP transport if the client requires explicit transport.
- Complete authentication flow when prompted by the client.
- Confirm tools are discoverable before first task prompt.
Example MCP Server Declaration
{
"servers": {
"sumup": {
"url": "https://mcp.sumup.com/mcp",
"transport": "streamable_http"
}
}
}
Adapt field names to the target client's MCP config schema.
Prompt Patterns
- "List my SumUp merchant checkouts from the last 24 hours."
- "Create a sandbox checkout for 12.34 EUR and return the checkout id."
- "Inspect this checkout id and summarize status transitions."
- "Show what data is needed to reconcile failed payments for this reference."
Common Failure Modes
Server not reachable
- Confirm exact URL and transport.
- Check client allows outbound HTTPS.
- Retry from a clean session.
Auth loop or unauthorized
- Re-run auth handshake and ensure correct account/environment.
- Confirm the token/session has required scopes.
Tools not appearing
- Refresh/reload MCP server in client.
- Confirm server alias matches the expected name in prompts/config.
Safety and Reliability Rules
- Never expose secrets or raw tokens in prompts or logs.
- Prefer sandbox for new workflows and regression tests.
- For payment-critical actions, verify final checkout status through deterministic reads.
- Record checkout ids/references for auditability and reconciliation.
Required Response Contract
When answering MCP setup/use requests, include:
What ships with it
3 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.
- 7d ago First seen · 85 lines · 66 tokens per session scan A a9b3fa20f85e
sumup-mcp is a skill published in the GitHub repository sumup/sumup-skills (4 stars, last pushed yesterday), licensed Apache-2.0. It adds 66 tokens to every session and 549 once invoked, about $0.0003 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 2026-08-30.
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