Rechnungslotse

German electronic invoicing end to end, not just validation — create XRechnung and ZUGFeRD, validate against EN 16931 and the full KoSIT rule set with every violation returned as a rule ID plus a plain-language fix, and read an invoice into structured data. Covers the German specifics a generic EN 16931 validator does not: Leitweg-ID MOD 97-10 check digits, the mandatory fields of § 14 UStG (works on a Word or PDF invoice with no data set), the staged German mandate (2025 receive, 2027/2028 issue), and the § 19 small-business thresholds. 18 tools; 7 need no account or key and `tools/list` is unauthenticated. Uploaded files are never stored. Hosted Streamable HTTP endpoint: `https://rechnungslotse.de/api/mcp`; account tools use OAuth 2.1 with PKCE. Official MCP Registry id `de.rechnungslotse/e-rechnung` v1.0.0 (DNS-verified namespace). Docs: https://rechnungslotse.de/mcp.

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