# ADR-0019: OSHUN Studio Complex Interaction Patterns and State Orchestration

**Status**: Accepted  
**Date**: 2026-02-23  
**Authors**: OSHUN Studio Product Design, OSHUN Web Engineering  
**Reviewers**: Domain Leads (Yemaya, Isis, Hathor, Aja, Bellona), Project
Obsidian Program Design

## Context and Problem Statement

Studio now governs IA, design language, typography, color, spacing, and
component primitives. However, advanced workflows still rely on complex
interactions: multi-step wizards, command stacks, parallel validation pipelines,
drag/reorder operations, and long-running async orchestration.

Without an explicit decision for complex interaction patterns, Studio risks:

- inconsistent async-state behavior across advanced workflows
- brittle user recovery paths in failure and partial-completion states
- accessibility regressions in high-density command surfaces
- drift in interaction semantics across Yemaya, Isis, Hathor, Aja, Bellona, and
  Project Obsidian

## Decision Drivers

- **Interaction determinism**: predictable state transitions for advanced flows.
- **Recovery ergonomics**: robust retry, rollback, and resume behavior.
- **Accessibility safety**: keyboard, focus, and screen-reader continuity
  through complex transitions.
- **Cross-domain consistency**: shared interaction grammar for advanced Studio
  capabilities.
- **Operational governance**: auditable release checks for high-risk patterns.

## Considered Options

### Option 1: Domain-Specific Interaction Models

Each domain defines its own advanced interaction patterns and state models.

**Pros**:

- Local optimization for domain-specific tooling.

**Cons**:

- High cognitive/context-switching costs.
- Increased regressions and duplicated maintenance.

### Option 2: Shared Base Components, Ungoverned Interaction Logic

Use shared primitives while allowing ad hoc orchestration logic.

**Pros**:

- Faster short-term implementation velocity.

**Cons**:

- No enforceable guarantees for state and recovery semantics.
- Harder incident triage across workflows.

### Option 3: Unified Complex Interaction Pattern System with Governed State Orchestration (Chosen)

Adopt a shared complex-interaction model with explicit state machines, recovery
contracts, and auditable promotion gates.

**Pros**:

- Deterministic user experience in high-risk workflows.
- Stronger resilience under async failure conditions.
- Better cross-domain maintainability and observability.

**Cons**:

- Added design/engineering governance overhead.

## Decision Outcome

**Chosen option**: Option 3.

Complex-interaction requirements:

1. **Canonical orchestration states**: `idle -> pending -> success | error` with
   optional resumable checkpoints.
2. **Recovery contract**: every advanced flow defines retry, rollback, and
   degraded-mode behavior.
3. **Concurrency contract**: parallel task groups have deterministic completion
   and cancellation semantics.
4. **Accessibility contract**: complex transitions preserve focus context and
   interaction reachability.
5. **Release governance**: draft -> validate -> approve -> publish with full
   telemetry/audit evidence.

## Normative Rules

### State-Orchestration Contract

- Advanced Studio flows must declare explicit transition states and terminal
  outcomes.
- Partial completion states must include deterministic user guidance.

### Recovery Contract

- Every complex flow must support retry and reset actions.
- High-impact failures must include rollback references or safe degraded mode.

### Concurrency Contract

- Parallel tasks must expose aggregate status and per-task diagnostics.
- Cancellation and timeout behavior must be deterministic and auditable.

### Accessibility Contract

- Focus management must remain stable throughout async transitions.
- Complex controls must be keyboard-operable and semantically announced.

### Release Validity Contract

A complex interaction release is valid only when all are true:

- state-transition validations pass
- recovery and timeout paths pass
- accessibility checks pass
- role-authorized approval exists
- telemetry/audit records are complete
- rollback or degraded-mode strategy is documented

## Architecture Implications

- `libs/oshun/ui` and `apps/oshun/web/src/design-system` remain shared
  interaction implementation layers.
- Studio complex-interaction governance flows are implemented under
  `apps/oshun/web` Studio routes.
- Observability contracts remain centralized in `libs/oshun/analytics`.

## Acceptance Criteria (OST-00049)

`OST-00049` is complete only when:

1. ADR exists at
   `docs/adr/ADR-0025-oshun-studio-complex-interaction-patterns-and-state-orchestration.md`.
2. ADR defines options, trade-offs, and selected strategy.
3. ADR defines state-orchestration, recovery, concurrency, accessibility, and
   release-validity contracts.
4. ADR aligns with `ADR-0007` through `ADR-0018`.
5. ADR aligns with `docs/releases/v1/design/ux-principles.md`,
   `docs/releases/v1/design/ergonomics-requirements.md`, and `libs/oshun/ui`.
6. ADR explicitly covers Yemaya, Isis, Hathor, Aja, Bellona, and Project
   Obsidian.

## Consequences

### Positive

- Predictable advanced workflow behavior across domains.
- Lower incident severity through stronger recovery semantics.
- Better operator trust in Studio orchestration controls.

### Negative

- Increased governance and validation effort.
- Higher up-front design rigor for interaction-state modeling.

## Related Decisions

- `docs/adr/ADR-0013-oshun-shell-architecture-and-domain-adapters.md`
- `docs/adr/ADR-0014-oshun-web-and-pwa-strategy.md`
- `docs/adr/ADR-0015-deep-linking-and-cross-domain-routing.md`
- `docs/adr/ADR-0016-shared-identity-and-cross-domain-session-model.md`
- `docs/adr/ADR-0017-offline-caching-and-sync-strategy.md`
- `docs/adr/ADR-0018-analytics-taxonomy-and-event-naming.md`
- `docs/adr/ADR-0019-oshun-studio-information-architecture.md`
- `docs/adr/ADR-0020-oshun-studio-design-language-and-visual-identity.md`
- `docs/adr/ADR-0021-oshun-studio-typography-system.md`
- `docs/adr/ADR-0022-oshun-studio-color-system-and-token-governance.md`
- `docs/adr/ADR-0023-oshun-studio-spacing-and-layout-grid.md`
- `docs/adr/ADR-0024-oshun-studio-component-primitives-and-composition-contracts.md`

## References

- `docs/releases/v1/design/ux-principles.md`
- `docs/releases/v1/design/ergonomics-requirements.md`
- `docs/domains/yemaya/features.md`
- `docs/domains/isis/features.md`
- `docs/domains/hathor/features.md`
- `docs/domains/aja/features.md`
- `docs/domains/bellona/features.md`
- `libs/oshun/ui`
- `apps/oshun/web/src/design-system/tokens.ts`