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Zollwerk

The specification exists. Here is its footprint.

This page shows the scale of the specification and the evidence that it is enforced, and deliberately not its content. If a page were specific enough to rebuild the kit from, it would be part of the product, and it is.

Pre-order €99
Ships September 2026 · refundable until deliveryBack to pricing
8
enforced invariants
11
acceptance criteria
1,771
passing tests in 98 files
2
languages, EN interface + DE legal vocabulary

Counts captured from the real repository on 2026-09-01 and recaptured at every release.

Eight invariants, by title

Each is a hard rule the codebase enforces mechanically: by database permissions, failing builds and pre-checks, with negative tests proving each guard bites. Titles only; the definitions ship with the kit.

  1. Every model call goes through one door
  2. Every query is tenant-scoped
  3. The audit trail stores redacted content only
  4. Every call is attributed to a feature
  5. Money and audit tables are append-only
  6. No webhook is trusted unverified
  7. No secrets or personal data in logs
  8. Budgets are checked before the spend

Two excerpts and a receipt

Shown as captures, on purpose.

One line from a real migration: the application role is granted INSERT and SELECT on the audit table, and nothing else.
One line of one migration, the whole enforcement philosophy in it: what the app was never granted, it cannot do.
Terminal output of a build failing because a provider SDK was imported outside the sanctioned boundary.
A guard, photographed biting: the build refusing an out-of-bounds import.
Test run summary: 98 files, 1,771 tests, all passing, 5.86 seconds.
The suite, run on 1 September 2026. The counts on this page come from this run.

Where the rest is

Invariant definitions, acceptance criteria, schema, architecture, the reasoning behind every locked decision: the buyer gets all of it, in the repository, as the working document it is.

The full specification ships with the kit.

Pre-order €99
Ships September 2026 · refundable until deliveryBack to pricing

Technical building blocks and document templates, not legal advice. Review with your lawyer.