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gh-greyhaven-ai-claude-code…/skills/context-management/examples/parallel-workflow-example.md
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Parallel Workflow Example: Full-Stack Feature Implementation

Complete example of parallel agent execution with context merge.

Scenario: Implement user profile feature with frontend, backend, and tests developed concurrently.

Workflow Pattern: Parallel Execution → Merge → Integration

Overview

Timeline: ~2 hours (vs 6 hours sequential)

Agents Involved:

  1. Parent Orchestrator - Coordinates parallel work
  2. Frontend Developer - React components (parallel)
  3. Backend Developer - API endpoints (parallel)
  4. Test Generator - E2E tests (parallel)
  5. Integration Verifier - Merge and verify (sequential)

Speedup: 3x faster than sequential execution

Phase 1: Parent Context Initialization

Agent: Orchestrator Duration: 5 minutes Purpose: Define overall feature and spawn parallel tasks

Parent Context Save

{
  "version": "1.0",
  "workflow_id": "user-profile-feature-20250115",
  "timestamp": "2025-01-15T09:00:00Z",
  "current_agent": "orchestrator",
  "next_agent": null,
  "phase": "parallel-execution",

  "feature_spec": {
    "name": "User Profile Management",
    "description": "Allow users to view and edit their profile information",
    "requirements": [
      "View profile (name, email, avatar, bio)",
      "Edit profile fields",
      "Upload avatar image",
      "Validate email format",
      "Real-time validation feedback"
    ]
  },

  "parallel_tasks": [
    {
      "task_id": "frontend-impl",
      "agent": "react-tanstack-developer",
      "scope": "Build React components for profile view and edit",
      "context_ref": ".claude/context/user-profile-feature-20250115-frontend.json",
      "status": "in_progress",
      "started_at": "2025-01-15T09:05:00Z"
    },
    {
      "task_id": "backend-impl",
      "agent": "tdd-python-developer",
      "scope": "Implement profile API endpoints with TDD",
      "context_ref": ".claude/context/user-profile-feature-20250115-backend.json",
      "status": "in_progress",
      "started_at": "2025-01-15T09:05:00Z"
    },
    {
      "task_id": "test-impl",
      "agent": "playwright-tester",
      "scope": "Create E2E tests for profile feature",
      "context_ref": ".claude/context/user-profile-feature-20250115-tests.json",
      "status": "in_progress",
      "started_at": "2025-01-15T09:05:00Z"
    }
  ],

  "shared_constraints": [
    "Must use existing auth system",
    "Profile data stored in PostgreSQL users table",
    "Avatar images stored in Cloudflare R2",
    "Real-time updates via WebSocket optional (nice-to-have)"
  ],

  "integration_requirements": [
    "Frontend calls backend API",
    "API returns expected data format",
    "E2E tests validate full flow",
    "All tests pass in CI"
  ],

  "success_criteria": {
    "backend": [
      "API endpoints: GET /api/profile, PUT /api/profile",
      "Test coverage >90%",
      "Response time <100ms"
    ],
    "frontend": [
      "ProfileView and ProfileEdit components",
      "Form validation with Zod",
      "Avatar upload with preview",
      "Component tests >85% coverage"
    ],
    "e2e": [
      "Complete user flow tested",
      "Error cases covered",
      "All tests passing"
    ]
  },

  "context_summary": "Initialized parallel development of user profile feature with 3 concurrent tracks: frontend (React), backend (Python), and E2E tests (Playwright)."
}

File: .claude/context/user-profile-feature-20250115.json

Phase 2A: Frontend Implementation (Parallel)

Agent: React-TanStack Developer Duration: 45 minutes (runs in parallel with backend and tests)

Frontend Context Save

{
  "version": "1.0",
  "workflow_id": "user-profile-feature-20250115-frontend",
  "parent_workflow_id": "user-profile-feature-20250115",
  "task_id": "frontend-impl",
  "timestamp": "2025-01-15T09:50:00Z",
  "current_agent": "react-tanstack-developer",
  "next_agent": null,
  "phase": "frontend-complete",

  "files_modified": [
    "src/routes/profile/index.tsx",
    "src/routes/profile/edit.tsx",
    "src/components/ProfileView.tsx",
    "src/components/ProfileEdit.tsx",
    "src/components/AvatarUpload.tsx",
    "src/lib/validation/profile-schema.ts",
    "tests/components/ProfileView.test.tsx",
    "tests/components/ProfileEdit.test.tsx"
  ],

  "decisions": [
    "Use TanStack Query for profile data fetching",
    "Use TanStack Form for profile edit form",
    "Zod schema for client-side validation",
    "Optimistic updates for better UX",
    "Avatar preview before upload using FileReader API"
  ],

  "pending_actions": [
    "Integrate with backend API endpoints (waiting for backend-impl)",
    "Update API base URL in production config",
    "Add loading states and error handling",
    "Accessibility audit (WCAG 2.1 AA)"
  ],

  "implementation_details": {
    "components": {
      "ProfileView": {
        "path": "src/components/ProfileView.tsx",
        "props": "{ userId: string }",
        "key_features": [
          "Fetches profile with TanStack Query",
          "Displays avatar, name, email, bio",
          "Edit button navigates to /profile/edit",
          "Loading skeleton",
          "Error boundary"
        ]
      },
      "ProfileEdit": {
        "path": "src/components/ProfileEdit.tsx",
        "props": "{ userId: string, onSuccess: () => void }",
        "key_features": [
          "TanStack Form with Zod validation",
          "Real-time validation feedback",
          "Avatar upload with preview",
          "Optimistic updates",
          "Cancel discards changes"
        ]
      },
      "AvatarUpload": {
        "path": "src/components/AvatarUpload.tsx",
        "props": "{ currentAvatar?: string, onUpload: (file: File) => void }",
        "key_features": [
          "Drag-and-drop or click to upload",
          "Image preview before upload",
          "Client-side validation (max 5MB, jpg/png only)",
          "Crop modal (optional enhancement)"
        ]
      }
    },

    "validation_schema": {
      "path": "src/lib/validation/profile-schema.ts",
      "schema": "z.object({ name: z.string().min(1).max(100), email: z.string().email(), bio: z.string().max(500).optional(), avatar: z.instanceof(File).optional() })",
      "shared_with_backend": false
    },

    "test_coverage": {
      "total": "87%",
      "files": {
        "ProfileView.test.tsx": "92% - tests loading, error, success states",
        "ProfileEdit.test.tsx": "85% - tests validation, submission, cancel"
      }
    }
  },

  "api_contract_assumptions": {
    "GET /api/profile/:userId": {
      "response": "{ id: string, name: string, email: string, bio?: string, avatar_url?: string }",
      "error_codes": [401, 404]
    },
    "PUT /api/profile/:userId": {
      "request": "{ name: string, email: string, bio?: string }",
      "response": "{ id: string, name: string, email: string, bio?: string, avatar_url?: string }",
      "error_codes": [400, 401, 404]
    },
    "POST /api/profile/:userId/avatar": {
      "request": "multipart/form-data with 'avatar' field",
      "response": "{ avatar_url: string }",
      "error_codes": [400, 413]
    }
  },

  "context_summary": "Implemented React components for user profile (view and edit) with TanStack Query/Form, Zod validation, and avatar upload. 87% test coverage. Ready for backend API integration."
}

File: .claude/context/user-profile-feature-20250115-frontend.json Execution Time: 45 minutes

Phase 2B: Backend Implementation (Parallel)

Agent: TDD-Python Developer Duration: 60 minutes (runs in parallel with frontend and tests)

Backend Context Save

{
  "version": "1.0",
  "workflow_id": "user-profile-feature-20250115-backend",
  "parent_workflow_id": "user-profile-feature-20250115",
  "task_id": "backend-impl",
  "timestamp": "2025-01-15T10:05:00Z",
  "current_agent": "tdd-python-developer",
  "next_agent": null,
  "phase": "backend-complete",

  "files_modified": [
    "src/api/routes/profile.py",
    "src/models/user.py",
    "src/schemas/profile.py",
    "tests/api/test_profile.py",
    "tests/integration/test_profile_flow.py",
    "alembic/versions/003_add_bio_to_users.py"
  ],

  "decisions": [
    "Use FastAPI for REST endpoints",
    "Pydantic v2 for request/response schemas",
    "SQLModel for database ORM",
    "Cloudflare R2 for avatar storage via presigned URLs",
    "JWT authentication (existing auth system)",
    "Rate limiting: 10 profile updates per hour per user"
  ],

  "pending_actions": [
    "Configure R2 bucket in production (cloudflare-r2-avatars)",
    "Set environment variables: R2_ACCOUNT_ID, R2_ACCESS_KEY_ID, R2_SECRET_ACCESS_KEY",
    "Run database migration: alembic upgrade head",
    "Add CORS configuration for frontend domain"
  ],

  "implementation_details": {
    "endpoints": {
      "GET /api/profile/{user_id}": {
        "auth": "Required (JWT)",
        "permissions": "User can only view own profile or public profiles",
        "response_model": "ProfileResponse",
        "cache": "60 seconds",
        "performance": "Avg 45ms, P99 85ms"
      },
      "PUT /api/profile/{user_id}": {
        "auth": "Required (JWT)",
        "permissions": "User can only edit own profile",
        "request_model": "ProfileUpdateRequest",
        "response_model": "ProfileResponse",
        "validation": "Email uniqueness, name min 1 char, bio max 500 chars",
        "performance": "Avg 120ms, P99 200ms"
      },
      "POST /api/profile/{user_id}/avatar": {
        "auth": "Required (JWT)",
        "permissions": "User can only upload to own profile",
        "request": "multipart/form-data",
        "validation": "Max 5MB, jpg/png/gif only",
        "response_model": "AvatarUploadResponse",
        "storage": "Cloudflare R2 with public URL",
        "performance": "Avg 850ms, P99 1500ms"
      }
    },

    "schemas": {
      "ProfileResponse": {
        "fields": "id: UUID, name: str, email: EmailStr, bio: Optional[str], avatar_url: Optional[str], created_at: datetime, updated_at: datetime"
      },
      "ProfileUpdateRequest": {
        "fields": "name: str (min 1, max 100), email: EmailStr, bio: Optional[str] (max 500)",
        "validators": "Email uniqueness check, name not empty"
      },
      "AvatarUploadResponse": {
        "fields": "avatar_url: str"
      }
    },

    "database_changes": {
      "migration": "003_add_bio_to_users",
      "changes": [
        "Add 'bio' column to users table (TEXT, nullable)",
        "Add 'avatar_url' column to users table (VARCHAR(500), nullable)",
        "Add index on users.email for uniqueness check"
      ]
    },

    "test_coverage": {
      "total": "94%",
      "files": {
        "test_profile.py": "Unit tests for endpoints - 95% coverage",
        "test_profile_flow.py": "Integration tests for full flow - 92% coverage"
      },
      "test_count": {
        "total": 28,
        "unit": 18,
        "integration": 10
      }
    }
  },

  "security_measures": [
    "JWT authentication on all endpoints",
    "Permission check: user can only modify own profile",
    "Email validation and sanitization",
    "SQL injection prevention via SQLModel ORM",
    "File upload validation (type, size)",
    "Rate limiting on profile updates",
    "CORS restricted to frontend domain only"
  ],

  "context_summary": "Implemented FastAPI profile endpoints (GET, PUT, POST /avatar) with TDD approach. 94% test coverage (28 tests). Database migration ready. Avatar storage on Cloudflare R2. JWT auth and rate limiting implemented."
}

File: .claude/context/user-profile-feature-20250115-backend.json Execution Time: 60 minutes

Phase 2C: E2E Test Implementation (Parallel)

Agent: Playwright Tester Duration: 50 minutes (runs in parallel with frontend and backend)

E2E Tests Context Save

{
  "version": "1.0",
  "workflow_id": "user-profile-feature-20250115-tests",
  "parent_workflow_id": "user-profile-feature-20250115",
  "task_id": "test-impl",
  "timestamp": "2025-01-15T09:55:00Z",
  "current_agent": "playwright-tester",
  "next_agent": null,
  "phase": "e2e-tests-complete",

  "files_modified": [
    "e2e/profile/view-profile.spec.ts",
    "e2e/profile/edit-profile.spec.ts",
    "e2e/profile/upload-avatar.spec.ts",
    "e2e/fixtures/test-users.json",
    "e2e/utils/profile-helpers.ts"
  ],

  "decisions": [
    "Use Playwright for E2E testing",
    "Test against local development server",
    "Create dedicated test user accounts",
    "Use Page Object Model pattern",
    "Visual regression testing for avatar uploads"
  ],

  "pending_actions": [
    "Configure E2E tests in CI pipeline",
    "Set up test database seeding",
    "Add visual regression baseline images",
    "Run tests against staging before merge"
  ],

  "implementation_details": {
    "test_files": {
      "view-profile.spec.ts": {
        "tests": 5,
        "scenarios": [
          "View own profile - displays correct data",
          "View profile when not logged in - redirects to login",
          "View non-existent profile - shows 404",
          "Profile loads with avatar - image displayed",
          "Profile loads without avatar - shows default"
        ]
      },
      "edit-profile.spec.ts": {
        "tests": 8,
        "scenarios": [
          "Edit profile with valid data - saves successfully",
          "Edit name to empty string - shows validation error",
          "Edit email to invalid format - shows validation error",
          "Edit email to existing email - shows uniqueness error",
          "Bio exceeds 500 chars - shows validation error",
          "Cancel edit - discards changes",
          "Edit profile when not logged in - redirects",
          "Optimistic update - UI updates immediately"
        ]
      },
      "upload-avatar.spec.ts": {
        "tests": 6,
        "scenarios": [
          "Upload valid image (jpg) - succeeds and displays",
          "Upload valid image (png) - succeeds and displays",
          "Upload file >5MB - shows error",
          "Upload non-image file - shows error",
          "Upload image then cancel - reverts to previous",
          "Visual regression - avatar displays correctly"
        ]
      }
    },

    "page_objects": {
      "ProfileViewPage": {
        "selectors": {
          "avatar": "[data-testid='profile-avatar']",
          "name": "[data-testid='profile-name']",
          "email": "[data-testid='profile-email']",
          "bio": "[data-testid='profile-bio']",
          "editButton": "[data-testid='edit-profile-btn']"
        },
        "methods": [
          "isDisplayed()",
          "getDisplayedName()",
          "clickEditButton()"
        ]
      },
      "ProfileEditPage": {
        "selectors": {
          "nameInput": "[data-testid='input-name']",
          "emailInput": "[data-testid='input-email']",
          "bioInput": "[data-testid='input-bio']",
          "avatarUpload": "[data-testid='avatar-upload']",
          "saveButton": "[data-testid='save-profile-btn']",
          "cancelButton": "[data-testid='cancel-btn']"
        },
        "methods": [
          "fillName(name: string)",
          "fillEmail(email: string)",
          "fillBio(bio: string)",
          "uploadAvatar(filePath: string)",
          "clickSave()",
          "clickCancel()"
        ]
      }
    },

    "test_coverage": {
      "total_scenarios": 19,
      "happy_path": 7,
      "error_cases": 10,
      "edge_cases": 2
    }
  },

  "test_data": {
    "test_users": [
      {
        "id": "test-user-1",
        "name": "Alice Johnson",
        "email": "alice@example.com",
        "bio": "Software engineer and coffee enthusiast",
        "avatar_url": null
      },
      {
        "id": "test-user-2",
        "name": "Bob Smith",
        "email": "bob@example.com",
        "bio": null,
        "avatar_url": "https://example.com/avatars/bob.jpg"
      }
    ]
  },

  "assumptions": {
    "frontend": "React components render expected data-testid attributes",
    "backend": "API returns expected error codes (400, 401, 404)",
    "auth": "Test users can authenticate with JWT tokens"
  },

  "context_summary": "Created 19 E2E test scenarios with Playwright covering profile view, edit, and avatar upload. Page Object Model pattern for maintainability. Tests ready to run once frontend and backend integrated."
}

File: .claude/context/user-profile-feature-20250115-tests.json Execution Time: 50 minutes

Phase 3: Merge Parallel Results

Agent: Orchestrator Duration: 5 minutes Purpose: Merge contexts from 3 parallel tasks

Merged Context

{
  "version": "1.0",
  "workflow_id": "user-profile-feature-20250115",
  "timestamp": "2025-01-15T10:10:00Z",
  "current_agent": "orchestrator",
  "next_agent": "integration-verifier",
  "phase": "parallel-complete-merge",

  "feature_spec": {
    "name": "User Profile Management",
    "status": "implementation-complete"
  },

  "parallel_execution_summary": {
    "started_at": "2025-01-15T09:05:00Z",
    "completed_at": "2025-01-15T10:05:00Z",
    "total_duration_minutes": 60,
    "tasks": [
      {
        "task_id": "frontend-impl",
        "agent": "react-tanstack-developer",
        "duration_minutes": 45,
        "status": "completed",
        "files_count": 8,
        "test_coverage": "87%"
      },
      {
        "task_id": "backend-impl",
        "agent": "tdd-python-developer",
        "duration_minutes": 60,
        "status": "completed",
        "files_count": 6,
        "test_coverage": "94%"
      },
      {
        "task_id": "test-impl",
        "agent": "playwright-tester",
        "duration_minutes": 50,
        "status": "completed",
        "files_count": 5,
        "test_coverage": "100% (all scenarios covered)"
      }
    ]
  },

  "files_modified": [
    "src/routes/profile/index.tsx",
    "src/routes/profile/edit.tsx",
    "src/components/ProfileView.tsx",
    "src/components/ProfileEdit.tsx",
    "src/components/AvatarUpload.tsx",
    "src/lib/validation/profile-schema.ts",
    "tests/components/ProfileView.test.tsx",
    "tests/components/ProfileEdit.test.tsx",
    "src/api/routes/profile.py",
    "src/models/user.py",
    "src/schemas/profile.py",
    "tests/api/test_profile.py",
    "tests/integration/test_profile_flow.py",
    "alembic/versions/003_add_bio_to_users.py",
    "e2e/profile/view-profile.spec.ts",
    "e2e/profile/edit-profile.spec.ts",
    "e2e/profile/upload-avatar.spec.ts",
    "e2e/fixtures/test-users.json",
    "e2e/utils/profile-helpers.ts"
  ],

  "decisions": [
    "Frontend: TanStack Query + Form, Zod validation, optimistic updates",
    "Backend: FastAPI, Pydantic v2, SQLModel ORM, JWT auth",
    "Storage: Cloudflare R2 for avatars with presigned URLs",
    "Testing: Playwright E2E with Page Object Model",
    "Rate limiting: 10 profile updates per hour per user"
  ],

  "pending_actions": [
    "Integration verification (API contract alignment)",
    "Run full test suite (unit + integration + E2E)",
    "Configure R2 bucket in production",
    "Run database migration in staging",
    "Update API base URL in frontend production config",
    "Add CORS configuration for frontend domain",
    "Deploy to staging for final validation"
  ],

  "integration_concerns": [
    {
      "concern": "API contract alignment",
      "frontend_expects": "GET /api/profile/:userId returns { id, name, email, bio?, avatar_url? }",
      "backend_provides": "ProfileResponse with matching fields",
      "status": "aligned"
    },
    {
      "concern": "Error code handling",
      "frontend_expects": "400, 401, 404 error codes",
      "backend_provides": "400, 401, 404 as documented",
      "status": "aligned"
    },
    {
      "concern": "Avatar upload flow",
      "frontend_expects": "POST /api/profile/:userId/avatar with multipart form",
      "backend_provides": "Endpoint with multipart form support",
      "status": "aligned"
    }
  ],

  "metrics": {
    "total_files_modified": 19,
    "total_test_coverage": "91% average",
    "development_time": "60 minutes parallel (vs 155 minutes sequential)",
    "speedup": "2.6x faster"
  },

  "context_summary": "Successfully merged 3 parallel development tracks (frontend, backend, E2E tests). All implementations complete with 91% average test coverage. API contracts aligned. Ready for integration verification and deployment to staging."
}

File: .claude/context/user-profile-feature-20250115.json (updated)

Phase 4: Integration Verification

Agent: Integration Verifier Duration: 15 minutes Purpose: Verify all pieces work together

Final Context Save

{
  "version": "1.0",
  "workflow_id": "user-profile-feature-20250115",
  "timestamp": "2025-01-15T10:25:00Z",
  "current_agent": "integration-verifier",
  "next_agent": null,
  "phase": "integration-verified-ready-for-deployment",

  "verification_results": {
    "api_contract_alignment": {
      "status": "passed",
      "checks": [
        "✅ GET /api/profile/:userId response matches frontend expectations",
        "✅ PUT /api/profile/:userId request/response aligned",
        "✅ POST /api/profile/:userId/avatar matches frontend upload",
        "✅ Error codes (400, 401, 404) handled correctly"
      ]
    },

    "test_execution": {
      "status": "passed",
      "results": {
        "unit_tests": "46/46 passed (100%)",
        "integration_tests": "10/10 passed (100%)",
        "e2e_tests": "19/19 passed (100%)"
      },
      "total": "75/75 tests passed (100%)"
    },

    "performance": {
      "status": "passed",
      "measurements": {
        "GET /api/profile": "P50: 42ms, P95: 78ms, P99: 95ms ✅ (target <100ms)",
        "PUT /api/profile": "P50: 105ms, P95: 185ms, P99: 220ms ✅ (target <200ms)",
        "POST /api/profile/avatar": "P50: 780ms, P95: 1350ms, P99: 1680ms ✅ (target <2000ms)"
      }
    },

    "security": {
      "status": "passed",
      "checks": [
        "✅ JWT authentication on all endpoints",
        "✅ Permission checks prevent cross-user access",
        "✅ Email validation and sanitization",
        "✅ File upload validation (type, size)",
        "✅ Rate limiting configured",
        "✅ CORS restricted to allowed origins",
        "✅ No secrets in frontend code"
      ]
    },

    "database_migration": {
      "status": "completed",
      "migration": "003_add_bio_to_users",
      "applied_to": ["development", "staging"],
      "pending": ["production"]
    }
  },

  "deployment_readiness": {
    "staging": {
      "status": "deployed",
      "url": "https://staging.example.com/profile",
      "deployed_at": "2025-01-15T10:20:00Z",
      "validation": "All E2E tests passed on staging"
    },
    "production": {
      "status": "ready",
      "prerequisites": [
        "✅ All tests passing",
        "✅ Code reviewed and approved",
        "✅ Security audit completed",
        "✅ Performance benchmarks met",
        "⏳ Run database migration (manual step)",
        "⏳ Configure R2 bucket (manual step)",
        "⏳ Deploy to production (manual step)"
      ]
    }
  },

  "pending_actions": [
    "Run production database migration: alembic upgrade head",
    "Configure Cloudflare R2 bucket: cloudflare-r2-avatars",
    "Set production environment variables (R2 credentials, CORS origin)",
    "Deploy backend to production",
    "Deploy frontend to production",
    "Monitor production metrics for 24 hours",
    "Create user documentation for profile feature"
  ],

  "context_summary": "Integration verified successfully. All 75 tests passing. Performance targets met. Security audit passed. Deployed to staging and validated. Ready for production deployment after manual configuration steps (database migration, R2 bucket setup)."
}

File: .claude/context/user-profile-feature-20250115.json (final)

Workflow Metrics

Time Comparison

Phase Sequential Parallel Speedup
Design & Planning 5 min 5 min 1.0x
Frontend Implementation 45 min 45 min 1.0x (parallel)
Backend Implementation 60 min 60 min 1.0x (parallel)
E2E Test Implementation 50 min 50 min 1.0x (parallel)
Development Total 160 min 60 min 2.7x
Integration & Verification 15 min 15 min 1.0x
Overall Total 180 min 80 min 2.25x

Savings: 100 minutes (1 hour 40 minutes)

Context Size Progression

Phase Context Size Files Modified
Initial (Parent) 2.1 KB 0
Frontend (Child) 4.8 KB 8
Backend (Child) 6.2 KB 6
E2E Tests (Child) 5.1 KB 5
Merged 12.5 KB 19
Final (Verified) 8.9 KB 19

Optimization: Merged context pruned conversation history and redundant data, reducing from 12.5 KB to 8.9 KB (29% reduction).

Test Coverage

Track Unit Tests Integration Tests E2E Tests Coverage
Frontend 2 suites - - 87%
Backend 18 tests 10 tests - 94%
E2E Tests - - 19 scenarios 100%
Total 20 10 19 91% avg

Key Takeaways

Parallel Execution Benefits

✅ 2.25x faster than sequential execution ✅ Independent work streams - no blocking between frontend, backend, tests ✅ Early issue detection - E2E tests identified API contract assumptions early ✅ Higher quality - Each agent focused deeply on their domain

Context Management Insights

Context Size: Parallel contexts were larger overall (total ~16 KB vs sequential ~8 KB), but merge reduced redundancy to 8.9 KB.

Context Merge Strategy:

  • Union of files_modified (no duplicates)
  • Concatenate decisions from all tasks
  • Merge pending_actions with deduplication
  • Aggregate error_log from all tasks

Handoff Points:

  1. Parent → 3 parallel children (split)
  2. 3 parallel children → parent (merge)
  3. Parent → integration verifier (sequential)

Challenges and Solutions

Challenge 1: API contract alignment between frontend and backend Solution: Defined explicit API contract assumptions in parent context. Integration verifier validated alignment.

Challenge 2: Test data coordination across E2E tests and backend Solution: Shared test user fixtures in parent context. Backend seeded database with test data.

Challenge 3: Avatar upload implementation depends on R2 configuration Solution: Documented R2 setup as prerequisite in parent context. Used local file storage for development.

Usage Guide

When to Use Parallel Execution

✅ Use parallel when:

  • Tasks are independent (minimal dependencies)
  • Different agents/skill sets required
  • Time-critical delivery
  • Multiple subsystems (frontend, backend, database, tests)

❌ Don't use parallel when:

  • Tasks have sequential dependencies
  • Shared resources with locking concerns
  • Single agent can handle all work efficiently
  • Coordination overhead > time savings

Scaling to More Tasks

This example showed 3 parallel tasks. Practical limits:

  • 3-5 tasks: Optimal parallelism (diminishing returns after)
  • 6-10 tasks: Requires careful orchestration, higher merge complexity
  • 10+ tasks: Consider hierarchical parallelism (parent spawns sub-parents)

Example Complexity: Medium-High Lines of Code: ~2000 across 19 files Total Tests: 75 (20 unit, 10 integration, 19 E2E) Success Rate: 100% (all tests passing) Production Ready: Yes (after manual config steps)

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