@every-env/cli/issues/feat-enterprise-cli-architecture.md

Multi-agent orchestrator for AI-powered development workflows

# feat: Enterprise-Grade CLI Architecture with Extensible Plugin System

## Executive Summary

Transform the Every CLI interface into a highly modular, enterprise-grade command-line architecture that embraces SOLID principles, leverages advanced design patterns, and provides infinite extensibility through a comprehensive plugin ecosystem. This architectural overhaul will establish Every as the gold standard for AI-powered development orchestration platforms.

## Strategic Vision

### Business Objectives
- Position Every as an enterprise-ready solution for Fortune 500 adoption
- Enable seamless integration with existing corporate toolchains
- Support multi-tenant deployments with role-based access control
- Facilitate white-label customization for partner integrations
- Ensure compliance with SOC2, ISO 27001, and GDPR requirements

### Technical Goals
- Achieve 99.99% uptime reliability for critical workflows
- Support horizontal scaling to 10,000+ concurrent agent executions
- Enable sub-50ms command response times at P99
- Maintain backward compatibility through semantic versioning
- Provide comprehensive telemetry and observability

## Architectural Design

### Core Architecture Principles

#### 1. Hexagonal Architecture (Ports & Adapters)
```typescript
// src/core/domain/ports/
interface WorkflowPort {
  plan(input: PlanInput): Promise<PlanResult>;
  delegate(task: Task): Promise<DelegationResult>;
  assess(result: Result): Promise<AssessmentResult>;
  codify(learning: Learning): Promise<CodificationResult>;
}

// src/core/domain/adapters/
class InkUIAdapter implements UIPort { }
class RESTAPIAdapter implements APIPort { }
class GraphQLAdapter implements APIPort { }
class gRPCAdapter implements RPCPort { }
```

#### 2. Domain-Driven Design (DDD)
```typescript
// src/core/domain/entities/
class WorkflowAggregate {
  private readonly events: DomainEvent[] = [];
  private readonly invariants: InvariantRule[] = [];
  
  constructor(
    private readonly id: WorkflowId,
    private readonly repository: WorkflowRepository,
    private readonly eventBus: EventBus
  ) {}
}

// src/core/domain/value-objects/
class TaskId extends ValueObject<string> { }
class WorkflowState extends ValueObject<StateEnum> { }
```

#### 3. Command Query Responsibility Segregation (CQRS)
```typescript
// src/core/application/commands/
@CommandHandler(CreateWorkflowCommand)
class CreateWorkflowCommandHandler {
  constructor(
    private readonly writeRepo: WorkflowWriteRepository,
    private readonly eventStore: EventStore
  ) {}
}

// src/core/application/queries/
@QueryHandler(GetWorkflowProgressQuery)
class GetWorkflowProgressQueryHandler {
  constructor(
    private readonly readModel: WorkflowReadModel,
    private readonly cache: DistributedCache
  ) {}
}
```

### Plugin Architecture

#### Plugin System Design
```typescript
// src/plugins/core/
interface PluginManifest {
  id: string;
  version: SemVer;
  dependencies: PluginDependency[];
  capabilities: PluginCapability[];
  permissions: PluginPermission[];
  hooks: PluginHook[];
}

abstract class Plugin {
  abstract async onLoad(context: PluginContext): Promise<void>;
  abstract async onUnload(): Promise<void>;
  abstract async getExtensions(): Promise<Extension[]>;
}

// src/plugins/registry/
class PluginRegistry {
  private readonly loader: PluginLoader;
  private readonly validator: PluginValidator;
  private readonly sandbox: PluginSandbox;
  
  async register(manifest: PluginManifest): Promise<PluginRegistration> {
    await this.validator.validate(manifest);
    const sandbox = await this.sandbox.create(manifest);
    return this.loader.load(manifest, sandbox);
  }
}
```

#### Extension Points
```typescript
// src/extensions/
interface ExtensionPoint<T> {
  id: string;
  contract: TypeContract<T>;
  lifecycle: ExtensionLifecycle;
}

const extensionPoints = {
  // UI Extensions
  'ui.theme': new ExtensionPoint<ThemeProvider>(),
  'ui.component': new ExtensionPoint<ComponentProvider>(),
  'ui.layout': new ExtensionPoint<LayoutProvider>(),
  
  // Workflow Extensions
  'workflow.phase': new ExtensionPoint<PhaseProvider>(),
  'workflow.action': new ExtensionPoint<ActionProvider>(),
  'workflow.validator': new ExtensionPoint<ValidatorProvider>(),
  
  // Agent Extensions
  'agent.provider': new ExtensionPoint<AgentProvider>(),
  'agent.capability': new ExtensionPoint<CapabilityProvider>(),
  'agent.tool': new ExtensionPoint<ToolProvider>(),
  
  // Integration Extensions
  'integration.vcs': new ExtensionPoint<VCSProvider>(),
  'integration.ci': new ExtensionPoint<CIProvider>(),
  'integration.monitoring': new ExtensionPoint<MonitoringProvider>(),
};
```

### Dependency Injection Container

```typescript
// src/core/container/
@Injectable()
class DIContainer {
  private readonly providers = new Map<Token, Provider>();
  private readonly scopes = new Map<ScopeId, Scope>();
  
  register<T>(token: Token<T>, provider: Provider<T>, options?: RegistrationOptions): void {
    this.providers.set(token, {
      ...provider,
      lifecycle: options?.lifecycle || 'transient',
      scope: options?.scope || 'application',
    });
  }
  
  resolve<T>(token: Token<T>, context?: ResolutionContext): T {
    const provider = this.providers.get(token);
    if (!provider) throw new ResolutionError(token);
    
    return this.instantiate(provider, context);
  }
}

// Usage with decorators
@Service()
class WorkflowService {
  constructor(
    @Inject(WORKFLOW_REPOSITORY) private repo: WorkflowRepository,
    @Inject(EVENT_BUS) private eventBus: EventBus,
    @Inject(LOGGER) private logger: Logger
  ) {}
}
```

### Event-Driven Architecture

```typescript
// src/core/events/
interface EventBus {
  publish<T extends DomainEvent>(event: T): Promise<void>;
  subscribe<T extends DomainEvent>(
    eventType: Constructor<T>,
    handler: EventHandler<T>
  ): Subscription;
}

// src/core/events/implementations/
class DistributedEventBus implements EventBus {
  constructor(
    private readonly local: LocalEventBus,
    private readonly remote: MessageQueue,
    private readonly serializer: EventSerializer
  ) {}
  
  async publish<T extends DomainEvent>(event: T): Promise<void> {
    // Local handlers
    await this.local.publish(event);
    
    // Remote handlers via message queue
    if (event.metadata.distributed) {
      await this.remote.send(
        this.serializer.serialize(event)
      );
    }
  }
}
```

### Middleware Pipeline

```typescript
// src/core/middleware/
interface Middleware<TContext = any> {
  execute(context: TContext, next: Next): Promise<void>;
}

class MiddlewarePipeline<TContext> {
  private middlewares: Middleware<TContext>[] = [];
  
  use(middleware: Middleware<TContext>): this {
    this.middlewares.push(middleware);
    return this;
  }
  
  async execute(context: TContext): Promise<void> {
    let index = -1;
    
    const dispatch = async (i: number): Promise<void> => {
      if (i <= index) throw new Error('next() called multiple times');
      index = i;
      
      const middleware = this.middlewares[i];
      if (!middleware) return;
      
      await middleware.execute(context, () => dispatch(i + 1));
    };
    
    await dispatch(0);
  }
}

// Built-in middleware
class AuthenticationMiddleware implements Middleware { }
class AuthorizationMiddleware implements Middleware { }
class RateLimitingMiddleware implements Middleware { }
class TelemetryMiddleware implements Middleware { }
class ErrorHandlingMiddleware implements Middleware { }
```

## Implementation Strategy

### Phase 1: Foundation Layer (Weeks 1-4)

#### Core Infrastructure
- [ ] Implement dependency injection container with decorator support
- [ ] Create plugin system with sandboxed execution environment
- [ ] Build event-driven message bus with local/distributed modes
- [ ] Establish middleware pipeline architecture
- [ ] Design extensible command/query handling system

#### Testing Infrastructure
```typescript
// src/testing/
class TestContainer extends DIContainer {
  mock<T>(token: Token<T>, implementation: Partial<T>): void {
    this.register(token, {
      factory: () => implementation as T,
      lifecycle: 'singleton',
    });
  }
}

@TestSuite()
class WorkflowServiceTests {
  @Mock(WORKFLOW_REPOSITORY)
  private mockRepo: WorkflowRepository;
  
  @InjectTest(WorkflowService)
  private service: WorkflowService;
  
  @Test()
  async shouldCreateWorkflow() {
    // Arrange
    when(this.mockRepo.save).thenResolve(new Workflow());
    
    // Act
    const result = await this.service.create({});
    
    // Assert
    expect(result).toBeDefined();
    verify(this.mockRepo.save).wasCalledOnce();
  }
}
```

### Phase 2: Domain Layer (Weeks 5-8)

#### Domain Model Implementation
- [ ] Define workflow aggregate with event sourcing
- [ ] Implement task value objects and entities
- [ ] Create domain events and event handlers
- [ ] Build repository interfaces and specifications
- [ ] Establish domain services and factories

#### Repository Pattern
```typescript
// src/core/domain/repositories/
interface Repository<T extends AggregateRoot> {
  findById(id: EntityId): Promise<T | null>;
  findBySpecification(spec: Specification<T>): Promise<T[]>;
  save(entity: T): Promise<void>;
  delete(id: EntityId): Promise<void>;
}

// src/infrastructure/repositories/
class EventSourcedWorkflowRepository implements WorkflowRepository {
  constructor(
    private readonly eventStore: EventStore,
    private readonly snapshotStore: SnapshotStore,
    private readonly projector: EventProjector
  ) {}
  
  async findById(id: WorkflowId): Promise<Workflow | null> {
    // Try snapshot first
    const snapshot = await this.snapshotStore.get(id);
    const fromVersion = snapshot?.version || 0;
    
    // Load events
    const events = await this.eventStore.getEvents(id, fromVersion);
    if (!events.length && !snapshot) return null;
    
    // Reconstruct aggregate
    const workflow = snapshot 
      ? Workflow.fromSnapshot(snapshot)
      : new Workflow(id);
      
    events.forEach(event => workflow.apply(event));
    return workflow;
  }
}
```

### Phase 3: Application Layer (Weeks 9-12)

#### Use Case Implementation
- [ ] Create command handlers for all workflow operations
- [ ] Build query handlers with caching strategies
- [ ] Implement saga orchestrators for complex workflows
- [ ] Design application services with transaction boundaries
- [ ] Establish validation and authorization decorators

#### Saga Pattern
```typescript
// src/core/application/sagas/
abstract class Saga<TState> {
  protected state: TState;
  private compensations: CompensationAction[] = [];
  
  abstract async execute(): Promise<void>;
  
  protected async executeStep<T>(
    action: () => Promise<T>,
    compensation: () => Promise<void>
  ): Promise<T> {
    try {
      const result = await action();
      this.compensations.push(compensation);
      return result;
    } catch (error) {
      await this.compensate();
      throw error;
    }
  }
  
  private async compensate(): Promise<void> {
    for (const compensation of this.compensations.reverse()) {
      await compensation();
    }
  }
}

class WorkflowExecutionSaga extends Saga<WorkflowExecutionState> {
  async execute(): Promise<void> {
    await this.executeStep(
      () => this.allocateResources(),
      () => this.releaseResources()
    );
    
    await this.executeStep(
      () => this.initializeAgents(),
      () => this.terminateAgents()
    );
    
    // Continue with workflow steps...
  }
}
```

### Phase 4: Infrastructure Layer (Weeks 13-16)

#### Adapters and Integrations
- [ ] Implement Ink UI adapter with component system
- [ ] Create REST API adapter with OpenAPI generation
- [ ] Build GraphQL adapter with schema federation
- [ ] Design gRPC adapter with protobuf definitions
- [ ] Establish WebSocket adapter for real-time updates

#### Persistence Strategies
```typescript
// src/infrastructure/persistence/
interface PersistenceStrategy {
  beginTransaction(): Promise<Transaction>;
  commit(transaction: Transaction): Promise<void>;
  rollback(transaction: Transaction): Promise<void>;
}

class OutboxPatternStrategy implements PersistenceStrategy {
  async commit(transaction: Transaction): Promise<void> {
    // Save domain events to outbox table
    await this.saveToOutbox(transaction.events);
    
    // Commit database transaction
    await transaction.commit();
    
    // Publish events asynchronously
    this.eventPublisher.publishFromOutbox();
  }
}
```

### Phase 5: Plugin Ecosystem (Weeks 17-20)

#### Core Plugins
- [ ] Authentication plugin (OAuth2, SAML, LDAP)
- [ ] Monitoring plugin (Prometheus, Grafana, ELK)
- [ ] Version control plugin (Git, SVN, Perforce)
- [ ] CI/CD plugin (Jenkins, GitLab, GitHub Actions)
- [ ] Cloud provider plugin (AWS, Azure, GCP)

#### Plugin Development Kit
```typescript
// packages/plugin-sdk/
export class PluginBuilder {
  private manifest: Partial<PluginManifest> = {};
  
  withCapability(capability: PluginCapability): this {
    this.manifest.capabilities.push(capability);
    return this;
  }
  
  withExtension<T>(
    point: ExtensionPoint<T>,
    provider: T
  ): this {
    this.manifest.extensions.push({
      point: point.id,
      provider,
    });
    return this;
  }
  
  build(): Plugin {
    return new CustomPlugin(this.manifest as PluginManifest);
  }
}
```

## Quality Assurance Strategy

### Testing Pyramid

#### Unit Tests (70%)
- Domain logic with property-based testing
- Pure functions with parameterized tests
- Value objects with invariant testing
- Mock external dependencies

#### Integration Tests (20%)
- Repository integration with test containers
- API endpoint testing with supertest
- Message queue integration with embedded brokers
- Database migration testing

#### E2E Tests (10%)
- Critical user journeys with Playwright
- Performance benchmarks with k6
- Chaos engineering with Litmus
- Security scanning with OWASP ZAP

### Performance Requirements

```typescript
// src/testing/performance/
@PerformanceTest()
class CLIPerformanceTests {
  @Benchmark({ 
    iterations: 1000,
    warmup: 100 
  })
  async commandResponseTime() {
    const start = performance.now();
    await cli.execute('plan "New feature"');
    const end = performance.now();
    
    expect(end - start).toBeLessThan(50); // <50ms P99
  }
  
  @LoadTest({ 
    vus: 100,
    duration: '5m' 
  })
  async concurrentWorkflows() {
    const results = await loadTest(async () => {
      await api.createWorkflow({ ... });
    });
    
    expect(results.metrics.http_req_duration.p99).toBeLessThan(200);
    expect(results.metrics.http_req_failed.rate).toBeLessThan(0.01);
  }
}
```

## Security Architecture

### Security Layers

```typescript
// src/security/
interface SecurityContext {
  principal: Principal;
  permissions: Permission[];
  tenant: TenantId;
  session: Session;
}

class SecurityManager {
  async authorize(
    context: SecurityContext,
    resource: Resource,
    action: Action
  ): Promise<AuthorizationResult> {
    // Check rate limits
    await this.rateLimiter.check(context);
    
    // Verify permissions
    const decision = await this.policyEngine.evaluate(
      context,
      resource,
      action
    );
    
    // Audit log
    await this.auditLogger.log({
      principal: context.principal,
      resource,
      action,
      decision,
      timestamp: new Date(),
    });
    
    return decision;
  }
}
```

### Compliance Framework

- **SOC2 Type II**: Automated control testing
- **GDPR**: Data residency and right to erasure
- **HIPAA**: Encryption at rest and in transit
- **ISO 27001**: Information security management

## Monitoring and Observability

### Telemetry Stack

```typescript
// src/observability/
class TelemetryProvider {
  private readonly metrics: MetricsClient;
  private readonly traces: TracingClient;
  private readonly logs: LoggingClient;
  
  @Trace()
  async recordOperation(
    operation: string,
    attributes: Record<string, any>
  ): Promise<void> {
    const span = this.traces.startSpan(operation, attributes);
    
    try {
      const timer = this.metrics.startTimer(`${operation}.duration`);
      
      await this.executeOperation();
      
      timer.end({ status: 'success' });
      this.metrics.increment(`${operation}.success`);
    } catch (error) {
      timer.end({ status: 'error' });
      this.metrics.increment(`${operation}.error`);
      span.recordException(error);
      throw error;
    } finally {
      span.end();
    }
  }
}
```

### SLI/SLO Definition

```yaml
slis:
  - name: cli_response_time
    type: latency
    threshold: 50ms
    percentile: 99
    
  - name: workflow_success_rate
    type: availability
    threshold: 99.9%
    
  - name: agent_throughput
    type: throughput
    threshold: 1000/min

slos:
  - sli: cli_response_time
    target: 99%
    window: 30d
    
  - sli: workflow_success_rate
    target: 99.5%
    window: 30d
```

## Migration Strategy

### Backward Compatibility

```typescript
// src/compatibility/
class LegacyAdapter {
  constructor(
    private readonly modernCli: ModernCLI,
    private readonly configMigrator: ConfigMigrator
  ) {}
  
  async executeLegacyCommand(args: string[]): Promise<void> {
    // Migrate configuration
    const modernConfig = await this.configMigrator.migrate(
      this.loadLegacyConfig()
    );
    
    // Map legacy commands to modern equivalents
    const modernCommand = this.mapCommand(args);
    
    // Execute with compatibility layer
    await this.modernCli.execute(modernCommand, {
      compatibilityMode: true,
    });
  }
}
```

### Phased Rollout

1. **Alpha**: Internal testing with feature flags
2. **Beta**: Early adopter program with telemetry
3. **GA**: General availability with migration tools
4. **Deprecation**: Legacy system sunset plan

## Success Metrics

### Technical KPIs
- Code coverage: >90%
- Cyclomatic complexity: <10 per method
- Technical debt ratio: <5%
- MTTR: <15 minutes
- MTBF: >720 hours

### Business KPIs
- Developer adoption: 10,000+ MAU within 6 months
- Enterprise customers: 50+ Fortune 500 companies
- Plugin ecosystem: 100+ certified plugins
- Community contributors: 500+ active developers
- Revenue potential: $10M ARR from enterprise licenses

## Risk Mitigation

### Technical Risks
| Risk | Impact | Likelihood | Mitigation |
|------|--------|------------|------------|
| Plugin security vulnerabilities | High | Medium | Sandboxed execution, security scanning |
| Performance degradation at scale | High | Low | Load testing, horizontal scaling |
| Breaking API changes | Medium | Medium | Semantic versioning, deprecation policy |
| Complex debugging scenarios | Medium | High | Distributed tracing, time-travel debugging |

### Business Risks
| Risk | Impact | Likelihood | Mitigation |
|------|--------|------------|------------|
| Slow enterprise adoption | High | Medium | Reference architectures, white-glove support |
| Competitive pressure | Medium | High | Rapid innovation, patent portfolio |
| Open source cannibalization | Low | Medium | Dual licensing, enterprise features |

## Timeline and Resources

### Development Timeline
- **Q1 2025**: Foundation and infrastructure (20 engineers)
- **Q2 2025**: Domain and application layers (25 engineers)
- **Q3 2025**: Plugin ecosystem and integrations (30 engineers)
- **Q4 2025**: Performance optimization and GA release (15 engineers)

### Resource Requirements
- **Engineering**: 30 FTE (10 senior, 15 mid, 5 junior)
- **Architecture**: 3 FTE principal/staff engineers
- **DevOps**: 5 FTE for infrastructure and CI/CD
- **Security**: 2 FTE for compliance and auditing
- **Product**: 3 FTE for roadmap and partnerships

### Budget Estimation
- **Personnel**: $6M/year
- **Infrastructure**: $500K/year
- **Tools/Licenses**: $200K/year
- **Training/Conferences**: $100K/year
- **Total**: ~$7M/year

## Conclusion

This enterprise-grade architecture positions Every as the definitive platform for AI-powered development workflows. By embracing advanced architectural patterns, establishing a robust plugin ecosystem, and ensuring enterprise-ready security and compliance, we create a solution that scales from individual developers to Fortune 500 engineering organizations.

The modular design ensures that each component can evolve independently while maintaining system cohesion through well-defined contracts and interfaces. The investment in this architecture will compound over time, creating a moat through network effects as the plugin ecosystem grows and enterprises build critical workflows on the platform.

---

**Labels**: `architecture`, `enhancement`, `enterprise`, `epic`, `high-priority`
**Assignee**: Chief Architect / Principal Engineering Team
**Milestone**: v2.0.0 - Enterprise Edition
**Estimated Effort**: 52 weeks
**Complexity**: Very High
**Business Impact**: Critical