# Autonomous Design System Intelligence

Webdev Agent OS v25 turns visual and interaction decisions into a governed evidence system. It connects design tokens, themes, components, code, accessibility, performance, browser evidence, design debt, and measured outcomes.

## Purpose

A design system is not merely a component gallery. It is a contract that should answer:

- Which token or visual decision produced this interface?
- Which component owns the pattern?
- Where is it implemented?
- Are every required interaction state and assistive-technology behavior verified?
- Does it remain correct across themes, brands, browsers, and viewports?
- Is a visual difference intentional, regressive, or unmeasured?
- Which duplicate patterns should be consolidated?
- What design debt creates the most user and engineering cost?
- Who approved a system-wide evolution, and how can it be rolled back?

## Evidence chain

```text
Design intent
→ Token set
→ Theme inheritance
→ Component contract
→ Interaction-state evidence
→ Source and requirement lineage
→ Accessibility and performance verification
→ Visual baseline and comparison
→ Release evidence
→ Journey and business outcome
```

## Core records

### Programs

A program defines scope, ownership, budget, objectives, and evidence boundaries for a design-system portfolio.

### Token sets and tokens

Tokens are typed as color, spacing, radius, typography, shadow, motion, size, z-index, opacity, or border. Unsafe executable values are rejected. Primitive, semantic, and brand tiers remain explicit.

### Themes

Themes inherit a governed token set and use controlled overrides. Every theme requires evidence and a rollback reference. White-label and cross-brand themes must preserve semantic, contrast, and interaction contracts.

### Components and states

A component includes:

- Stable identity and owner
- Repository-relative source path
- Category and version
- Required interaction states
- Evidence references
- Lineage to code, tokens, requirements, releases, and outcomes

Required states may include default, hover, focus, disabled, loading, error, open, empty, or selected behavior. A component is not complete because its default screenshot looks correct.

### Component quality contracts

Contracts connect:

- Required state evidence
- Unit and browser tests
- Keyboard and screen-reader checks
- Performance budgets
- Visual baselines
- Release and rollback evidence

A contract cannot be marked compliant until all required states pass and test plus accessibility evidence is present.

### Visual baselines and regressions

Visual evidence records theme, viewport, browser, image references, thresholds, and difference measurements. A comparison cannot pass above its configured threshold. Intentional baseline changes remain reviewable rather than silently replacing the prior truth.

### Design debt and duplicate patterns

Design debt includes incomplete interaction states, visual regressions, legacy CSS, missing theme rules, and component-contract gaps. Duplicate-pattern records show where page-specific implementations bypass reusable components.

### Evolution proposals

System-wide changes require:

- Defined component and token scope
- Verification references
- Rollback reference
- Independent reviewer
- No unresolved failing visual regressions for affected components

Proposal authors cannot approve their own work.

## Health model

The v25 health score weights:

- Token evidence coverage
- Theme inheritance and rollback readiness
- Interaction-state completeness
- Component-contract compliance
- Visual-regression pass rate
- Component lineage coverage
- Evidence coverage
- Approved evolution evidence

High-severity debt and unresolved duplicate patterns reduce the score. A high traceability score cannot hide failed component states or visual regressions.

## Client boundary

Client-scoped views may show approved themes, component names, state coverage, and contract status. They do not expose source paths, internal visual diffs, implementation debt, reviewer notes, or system-wide evolution evidence.

## External systems

The bundled system defines contracts for design and visual evidence but does not claim that Figma, Storybook, Chromatic, Percy, GitHub, a browser cloud, or a production deployment platform is connected.