What is invoicexml-mcp AGENTS.md?

Repository instructions for InvoiceXML MCP, a .NET server that lets AI agents work with electronic invoices through the InvoiceXML API. It covers supported invoice formats, commands, architecture, and rules that must remain intact.

Use it when building, testing, running, or modifying the server, including invoice creation, validation, rendering, data extraction, embedding, and format conversion.

It gives coding agents the project context they need before changing the code. This helps them preserve important behavior across self-hosted API-key and hosted OAuth deployments.

How InvoiceXML/invoicexml-mcp configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to InvoiceXML/invoicexml-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/InvoiceXML/invoicexml-mcp/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/InvoiceXML/invoicexml-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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/invoicexml/invoicexml-mcp/agents-md/github.svg)](https://agentmods.dev/instructions/invoicexml/invoicexml-mcp/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/invoicexml/invoicexml-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/invoicexml/invoicexml-mcp/agents-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/invoicexml/invoicexml-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/invoicexml/invoicexml-mcp/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,442 This file is loaded in full into every session.

When invoked 1,442 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.

Model	Per session	Once invoked
Fable 5.1	$0.01442	$0.01442
Opus 5.5	$0.00577	$0.00577
Sonnet 5.5	$0.00288	$0.00288
Haiku 4.5	$0.00144	$0.00144

Measured 6d ago against content hash 71a5e5dbe194, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

invoicexml-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 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.

AGENTS.md · 114 lines

How it starts

The opening of the file, as written. The whole thing — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Context for AI coding agents (and humans) working in this repository. Canonical prose lives in README.md and CONTRIBUTING.md; this file is the high-signal summary.

Note: GEMINI.md is a different thing. It is the end-user context for the hosted MCP server, referenced by gemini-extension.json. Do not put repo build or contributor instructions there.

What this is

A Model Context Protocol server (C# / .NET 10) that exposes the InvoiceXML API to AI agents: create, validate, render, extract, embed, and convert e-invoices across Factur-X, ZUGFeRD, XRechnung, UBL / CII, and Peppol BIS Billing 3.0.

One codebase, two deployment shapes, selected at startup by Mcp:AuthMode: ApiKey (self-hosted, single API key) or OAuth (hosted, OAuth 2.1 + DCR against invoicexml.com). The repo is platform-independent: it knows nothing about where or how it is hosted.

Commands

dotnet build                                   # whole solution (warnings are errors)
dotnet test                                    # all tests (xUnit)
dotnet test tests/InvoiceXml.Mcp.Core.Tests/InvoiceXml.Mcp.Core.Tests.csproj
dotnet run --project src/InvoiceXml.Mcp.Host   # run the host locally

Requires a .NET 10 SDK (global.json floor is 10.0.100, rolls forward to the latest 10.0.x). To run, supply an API key first, kept outside the repo: dotnet user-secrets --project src/InvoiceXml.Mcp.Host set "Mcp:ApiKey:Value" "<key>".

Local endpoints: GET / welcome page, POST / MCP endpoint, GET /health.

Architecture

InvoiceXml.Mcp.Core  --ProjectReference-->  InvoiceXml.Mcp.Host
(SDK: client + tools)                       (the deployable ASP.NET Core app)

Core is a transport- and auth-agnostic SDK: IInvoiceXmlClient + HttpInvoiceXmlClient, the DTOs/enums, and the [McpServerTool] classes. It consumes an HttpClient from IHttpClientFactory and never sees credentials.
Host reads Mcp:AuthMode and attaches the matching auth as an HttpClient DelegatingHandler via AddHostAuth(...). That handler seam is the whole reason one codebase serves both modes.

Read the full file on GitHub · 114 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.

6d ago Changed · +1 lines · +10 tokens per session 71a5e5dbe194
25d ago Changed · +1 tokens per session 9d0b00a9c257
29d ago Changed · +6 lines · +95 tokens per session 0ed9b354ff2a
2mo ago First seen · 107 lines · 1,336 tokens per session scan A 677c9cbd367e

Subscribe to this mod's changes

invoicexml-mcp AGENTS.md is an instructions file published in the GitHub repository InvoiceXML/invoicexml-mcp (5 stars, last pushed yesterday), licensed MIT. It adds 1,442 tokens to every session, about $0.0058 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.

gemini-cli-extension

invoicexml-mcp AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
invoicexml-mcp AGENTS.mdInvoiceXML/invoicexml-mcp	Instructions file	5	yesterday	MIT	A	1,442	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

invoicexml-mcp: Instructions file for Codex