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Method

How a piece is forged.

Every piece is run like a product: research, a spec, tests, a version. AI speeds up the making; nothing ships until it is checked and signed off.

Five steps, from research to sign-off.

  1. Watch — official texts and deadlines.

    Every piece starts from an official text: a law, a tax authority page, the EU Official Journal. Deadlines go on the Radar with a link to their source; a date that cannot be sourced stays off.

  2. Spec — what the piece must and must not do.

    Before the first line of code, the piece has acceptance criteria: what it calculates, what it produces, and what it does not do. That last list becomes "What this tool does not do" on its page.

  3. Forge — AI assists with code and copy.

    AI helps write the code and the first draft of the copy. Everything it produces is reviewed, corrected and versioned in the project repository.

  4. Tests — maths, formats, accessibility.

    The calculation engines are checked against reference cases on every change, and the Factur-X engine is tested with Mustang, the open-source EN 16931 validator. Pages aim for WCAG 2.2 level AA.

  5. Sign-off — I check, sign and date it.

    I review the piece, its tests and its sources, then publish it with its version and check date. The sign-off stamp and the build notes keep the record.

    Verified Engine tested EN 16931 · Mustang FRL·001 · v1.3 · 2026-10-06

    The sign-off stamp of the featured piece, as shown on its page.

My AI policy

I use AI for research, first drafts and code. Every piece is specified, tested and approved by me before it is published. Each piece's build notes say exactly what AI did.

— Clément Dehon

A choice made for transparency, not a claim of legal compliance.

See a piece's build notes

The Definition of Done

What a piece needs before it gets its sign-off:

  1. Tests passed: calculations and formats pass their automated tests.

  2. Dated sources: every rule applied links to its official text, with the date it was read.

  3. Human review: I review the piece and its copy before it ships.

  4. Accessibility AA: keyboard, contrast and screen readers, to WCAG 2.2 level AA.

  5. Nothing stored: Clairsmith keeps nothing you type.

The workbench

What is under study, being forged and recently signed off, read from each piece's data.

Under study (0)

No piece in this column for now.

Being forged (0)

No piece in this column for now.

Signed off (13)

Forge log

Every release and every fix is dated in the forge log.

See the forge log