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sumup-mcp: Instructions file for Codex

AGENTS.md

sumup-mcp AGENTS.md is an instructions file for Codex, OpenCode from sumup/sumup-mcp. It costs 471 tokens per session, scanned A, original, Apache-2.0.

Repository guidance for a SumUp MCP server, a service that lets AI tools interact with SumUp through a shared protocol. It documents the Cloudflare Worker setup, authentication, installation, and development commands.

In plain words
What is it for?
Use it when installing dependencies, running the local server, generating Cloudflare types, building, linting, checking types, or running tests.
Why use it?
It gives coding agents the project rules and commands they need to work consistently without guessing how the server runs or is checked.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md.

This is sumup/sumup-mcp's own configuration. It tells Codex and OpenCode how to work on sumup-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything sumup-mcp configures →

not rated 8repo 3d ago A scan 471 tokens original Apache-2.0
View source ↗ sumup/sumup-mcp mcp.sumup.com
Reuse

Borrowing it

Nothing to install: this file belongs to sumup/sumup-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/sumup/sumup-mcp/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/sumup/sumup-mcp

Made for: Codex, OpenCode.

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.

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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.

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Per session 471 This file is loaded in full into every session.
When invoked 471 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00471 $0.00471
Opus 5.5 $0.00188 $0.00188
Sonnet 5.5 $0.00094 $0.00094
Haiku 4.5 $0.00047 $0.00047

Measured 2mo ago against content hash e1b7725f0de1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sumup-mcp AGENTS.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 2mo 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.

AGENTS.md · 52 lines

How it starts

The opening of the file, as written. The whole thing — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Repository guide for coding agents working in @sumup/mcp.

Purpose

  • This repository implements a SumUp MCP server as a Cloudflare Worker.
  • It uses Hono for routing, a Durable Object-backed McpAgent for session handling, and OAuth bearer JWT validation against SumUp auth JWKS.
  • Key files: src/worker.ts, src/app.ts, src/auth.ts, src/protocol.ts, src/sumup-agent.ts.

Environment and Runtime

  • Package manager: npm.
  • Required runtime: Node.js >=22.
  • Module system: ESM ("type": "module").
  • TypeScript is configured with strict: true and moduleResolution: "bundler".
  • Local dev and deployment use Cloudflare Wrangler.
  • Worker configuration is in wrangler.jsonc.
  • Durable Object binding name: SUMUP_MCP_AGENT.

Install and Setup

  • Install dependencies: npm install
  • Start local worker dev server: npm run dev
  • Generate Cloudflare worker types if needed: npm run generate-types

Build, Lint, Typecheck, and Test

  • Build/typecheck: npm run build
  • Explicit typecheck: npm run typecheck
  • Lint and format check: npm run lint
  • Auto-fix lint/format issues: npm run lint:fix
  • Run tests: npm run test

Change Management Guidance for Agents

  • Prefer minimal targeted edits; this is a small, focused codebase.
  • Do not introduce new dependencies without a clear reason.
  • Keep OAuth, MCP, and protocol terminology accurate.
  • If changing public behavior, update or add tests in the same change.
  • If a change affects contributor workflow, update CONTRIBUTING.md or this file as needed.

PR and Commit Guidance

  • Follow Conventional Commits for PR titles and keep PR summaries explicit about behavior changes.

References

Read the full file on GitHub · 52 lines

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.

  1. 2mo ago First seen · 52 lines · 471 tokens per session scan A e1b7725f0de1

Subscribe to this mod's changes

sumup-mcp AGENTS.md is an instructions file published in the GitHub repository sumup/sumup-mcp (8 stars, last pushed 3d ago), licensed Apache-2.0. It adds 471 tokens to every session, about $0.0019 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 2026-08-31.

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Related

sumup-mcp AGENTS.md compared with instructions from other repositories

sumup-mcp AGENTS.md next to 6 instructions from other repositories
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