A case study · Public launch — April 2026
Dossier
A notation for building with AI, spoken plainly.
Year
2026
Status
Public launch — April 2026
Role
Product strategy, design system, engineering
Client
Independent product, Paperbird
Developer Tools
Documentation
AI Coding
DSL
Fig. 01 — Dossier, cover document — 2026
Chapter I
An overview
The hand-off between humans and coding agents is broken. Briefs get lost in Notion, PRDs live in shared drives, and agents end up guessing tone, tokens, and intent. Dossier proposes a different shape: a single, human-readable document that an LLM can follow like a spec and a designer can read like prose.
Margin
Every case study on this site is written in full sentences on purpose. If we cannot explain the project as prose, we do not understand it yet.
“The cheapest thing in the world is a prompt. The most expensive is a misunderstanding. Dossier buys the first to avoid the second.”
— Sena Aoyama, Design Engineer
Chapter II
The challenge
Every team we shipped with built their own informal DSL to keep agents on track — mood boards in Markdown, tone rules in CLAUDE.md, design tokens in scattered JSON. The result was drift: the spec and the product disagreed within weeks. We wanted one file, one source of truth, one voice.
Chapter III
Our approach
Dossier treats a project like a piece of writing. It has a voice, sections, constraints, and references. We studied technical editing — Chicago Manual, Government Publishing Office style — and translated those disciplines into a notation that is generous to read and precise to parse.
Notation study — the document as an interface
Collaborative review — DOSS spec reading
Dossier spec — early scaffolding
Dossier gallery install — launch event
Chapter IV
The solution
The DOSS format is a structured Markdown superset: colors, fonts, user stories, and page maps become first-class objects, but the file still reads beautifully as a document. Our editor generates DOSS documents from a guided interview, and coding agents read them directly — no translation layer.
Chapter V — Outcomes
At a glance
01 — Studios in private rollout
140
02 — Prototypes ready first pass
72%
03 — Spec fields standardized
38
04 — Public launch
April 2026
Dossier ships publicly in April 2026. In private rollout with 140 studios, 72% report their first AI-built prototype needed only a single round of clarification. The DOSS format is being adopted inside three agencies as their primary brief template.
Next in this issue
A quiet workspace for noisy teams.