# Interface and Navigation Composition

The Telynt application shell renders navigation, pages, widgets and commands contributed by installed InterfacePackage definitions. The shell is shared; a fixed Technology Consulting & Delivery sidebar is not the platform's universal navigation.

## Stable shell

The shell provides the product brand, workspace context, global search entry, help, account controls, responsive frame and consistent focus behavior. Account controls have one authoritative location. Package contributions use the common design tokens and component contracts.

## Navigation contributions

A contribution declares a stable route and screen identifier, owning package, placement, label, order, required capability and authorization conditions. The resolver checks collisions and missing targets before a composition is activated. A screen has one owner; other packages contribute declared slots without replacing that ownership.

## Contextual tabs

Tabs are composed within an object workspace. A meeting's Findings tab is owned by the finding package, while its Context tab is owned by the evidence package. The meeting package supplies the host context, not ownership of every tab. See the [solution screen map](/documentation/technology-consulting-delivery/screen-atlas).

## Permissions and unavailable capabilities

Navigation is resolved against installed capabilities and the viewer's authorization. Restricted destinations are not revealed to unauthorized users. Direct links apply the same checks. A removed capability has an explicit unavailable state; a permitted user can inspect the installation impact without exposing restricted records.

## Responsive and accessible behavior

The sidebar collapses into the shared compact navigation. Context tabs wrap or use an accessible overflow control; content never relies on hover alone. Controls retain keyboard operation, visible focus, descriptive names and readable contrast. Data tables use intentional horizontal scrolling rather than clipping values.

## Configuration and versioning

Menu order, labels and contributed widgets are versioned interface definitions. Preview and evaluate changes in Development and Testing, qualify in Staging and promote an immutable composition to Production. Customer overlays preserve the original publisher package.

## Reference documentation

- [Shared design system](/documentation/platform/design-system)
- [Interface package authoring](/documentation/developers/package-authoring)
- [Technology Consulting & Delivery composition](/documentation/technology-consulting-delivery/included-packages)