metabuilder/workflow/docs/WORKFLOW_DOCUMENTATION_INDEX.md

Workflow Service Documentation Index

Last Updated: 2026-01-22 Analyst: Claude Code Comprehensive Analysis: ✅ Complete

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Quick Start

For Understanding the Service

Start here → WORKFLOW_SERVICE_ANALYSIS_SUMMARY.md

• Executive summary
• Architecture overview
• Current state (40% complete)
• Next steps

For Implementation

Start here → WORKFLOW_LOADERV2_INTEGRATION_GUIDE.md

• Complete class implementation (copy-paste ready)
• Integration points with exact code
• Usage examples
• Testing strategy

For API Usage

Start here → WORKFLOW_ENDPOINTS_REFERENCE.md

• All 3 endpoints documented
• Request/response examples
• cURL examples
• Error responses

For Deep Dive

Start here → NEXTJS_WORKFLOW_SERVICE_MAP.md

• Service architecture (methods, parameters, types)
• Middleware integration
• Error handling patterns
• Multi-tenant support status
• Integration roadmap
• File inventory
• Current limitations

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Documents by Role

For Architects/Managers

1. WORKFLOW_SERVICE_ANALYSIS_SUMMARY.md - Status and effort estimate
2. NEXTJS_WORKFLOW_SERVICE_MAP.md - Gap analysis and limitations

Key metrics:

• Current completion: 40%
• Lines of code needed: ~400 for WorkflowLoaderV2
• Effort estimate: 5-8 hours total
• Status: Ready to implement, no blockers

For Backend Engineers

1. WORKFLOW_LOADERV2_INTEGRATION_GUIDE.md - Implementation guide
2. NEXTJS_WORKFLOW_SERVICE_MAP.md - Integration points section
3. WORKFLOW_ENDPOINTS_REFERENCE.md - Test with examples

Implementation order:

1. Create WorkflowLoaderV2 class (2-3 hrs)
2. Integrate into execute route (30 min)
3. Implement DBAL methods (1-2 hrs)
4. Test and polish (1-2 hrs)

For Frontend Engineers

1. WORKFLOW_ENDPOINTS_REFERENCE.md - Complete API docs
2. NEXTJS_WORKFLOW_SERVICE_MAP.md - Error handling section

Key info:

• 3 endpoints available (list, create, execute)
• Rate limits: 100/min for list, 50/min for mutations
• Auth required (all endpoints)
• Error codes documented with examples

For DevOps/SRE

1. NEXTJS_WORKFLOW_SERVICE_MAP.md - Performance considerations
2. WORKFLOW_SERVICE_ANALYSIS_SUMMARY.md - Scaling bottleneck

Critical info:

• Rate limiting: In-memory (single instance only)
• Redis recommended for multi-instance
• Execution: Synchronous (needs async for long workflows)
• Database: Multi-tenant filtering required on all queries

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Document Organization

WORKFLOW_SERVICE_DOCUMENTATION_INDEX.md (this file)
├─ WORKFLOW_SERVICE_ANALYSIS_SUMMARY.md (START HERE)
│  ├─ Executive summary
│  ├─ Architecture overview
│  ├─ 40% complete assessment
│  ├─ Next steps
│  └─ Links to detailed docs
│
├─ WORKFLOW_LOADERV2_INTEGRATION_GUIDE.md (IMPLEMENTATION GUIDE)
│  ├─ Complete class code (ready to copy-paste)
│  ├─ Integration points
│  ├─ Error mapping
│  ├─ Usage examples
│  ├─ Testing strategy
│  └─ Migration path
│
├─ WORKFLOW_ENDPOINTS_REFERENCE.md (API DOCUMENTATION)
│  ├─ All 3 endpoints
│  ├─ Request/response specs
│  ├─ cURL examples
│  ├─ JavaScript examples
│  ├─ Error responses
│  ├─ Rate limiting info
│  ├─ Authentication
│  └─ Troubleshooting
│
└─ NEXTJS_WORKFLOW_SERVICE_MAP.md (DETAILED REFERENCE)
   ├─ Service architecture
   ├─ All methods and signatures
   ├─ Middleware overview
   ├─ Database schema
   ├─ Error handling patterns
   ├─ Multi-tenant implementation
   ├─ Integration points for WorkflowLoaderV2
   ├─ Dependency map
   ├─ File inventory
   ├─ Current limitations (TODOs)
   ├─ Integration roadmap
   ├─ Type system
   ├─ Security considerations
   ├─ Performance considerations
   └─ Testing strategy

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Service Overview

Three-Layer Architecture

Next.js API Routes
    ↓
Middleware (Auth + Rate Limiting)
    ↓
Service Layer (WorkflowExecutionEngine)
    ↓
Execution Engine (@metabuilder/workflow)
    ↓
Database (DBAL - Placeholder Methods)

Core Files

File	Lines	Purpose	Status
workflow-service.ts	336	Main service implementation	✅ 80% done
[tenant]/workflows/route.ts	314	List/Create endpoints	✅ Complete
[workflowId]/execute/route.ts	178	Execute endpoint	✅ Complete
auth-middleware.ts	172	Authentication	✅ Complete
rate-limit.ts	316	Rate limiting	✅ Complete
workflow-loader.ts	~400	TO CREATE	❌ Not yet

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Endpoints Summary

GET /api/v1/{tenant}/workflows

List workflows with filtering

• Status: ✅ Ready (returns empty - no DBAL)
• Auth: Level 1+
• Rate: 100/min
• Query params: limit, offset, category, tags, active

POST /api/v1/{tenant}/workflows

Create new workflow

• Status: ✅ Ready (returns created - no persistence)
• Auth: Level 2+ (moderator)
• Rate: 50/min
• Body fields: name, description, category, nodes, edges, triggers, tags

POST /api/v1/{tenant}/workflows/{id}/execute

Execute workflow

• Status: ✅ Ready (executes - can't load real workflows)
• Auth: Level 1+
• Rate: 50/min
• Body fields: triggerData, variables, request

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Implementation Phases

Phase 1: WorkflowLoaderV2 (2-3 hours) 🔴 PRIORITY

What: Create validation and resolution layer Where: /frontends/nextjs/src/lib/workflow/workflow-loader.ts Code: See WORKFLOW_LOADERV2_INTEGRATION_GUIDE.md Why: Critical blocker for real execution

Phase 2: DBAL Integration (1-2 hours)

What: Implement database methods Where: workflow-service.ts (6 methods) Code: See "Integration Points" in NEXTJS_WORKFLOW_SERVICE_MAP.md Why: Enables workflow persistence

Phase 3: Execution Storage (1-2 hours)

What: Persist execution records Where: New execution.yaml entity + DBAL integration Why: Enables execution history and monitoring

Phase 4: Advanced Features (3-5 hours)

What: Abort logic, secrets, async execution Why: Production-ready features

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Critical Integration Points for WorkflowLoaderV2

Point 1: Load Workflow

Current: loadWorkflow() returns null (line 223-238) Change: Call DBAL with tenantId filter Reference: WORKFLOW_LOADERV2_INTEGRATION_GUIDE.md - loadFromDatabase() method

Point 2: Validate Schema

Current: No validation before execution Change: Add loader.load() in execute route (before engine.executeWorkflow()) Reference: WORKFLOW_LOADERV2_INTEGRATION_GUIDE.md - Integration Points section

Point 3: Resolve Nodes

Current: Runtime error if node type unknown Change: Pre-resolve in loader, return specific errors Reference: WORKFLOW_LOADERV2_INTEGRATION_GUIDE.md - resolveNodes() method

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File Locations Quick Reference

Service Files

• Main: /frontends/nextjs/src/lib/workflow/workflow-service.ts
• Index: /frontends/nextjs/src/lib/workflow/index.ts
• To create: /frontends/nextjs/src/lib/workflow/workflow-loader.ts

API Routes

• List/Create: /frontends/nextjs/src/app/api/v1/[tenant]/workflows/route.ts
• Execute: /frontends/nextjs/src/app/api/v1/[tenant]/workflows/[workflowId]/execute/route.ts

Middleware

• Auth: /frontends/nextjs/src/lib/middleware/auth-middleware.ts
• Rate Limit: /frontends/nextjs/src/lib/middleware/rate-limit.ts

Database

• Schema YAML: /dbal/shared/api/schema/entities/core/workflow.yaml
• Schema JSON: /schemas/package-schemas/workflow.schema.json
• DBAL Client: /frontends/nextjs/src/lib/db-client.ts

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Current State Assessment

What Works ✅

• Authentication (permission level checks)
• Rate limiting (per IP, sliding window)
• Multi-tenant structure (route params, validation)
• API route structure (Express-like)
• Error handling framework
• Type safety (TypeScript)
• DAG execution (via @metabuilder/workflow)

What's Missing ❌

• Database loading (all methods placeholder)
• Schema validation (no WorkflowLoaderV2)
• Execution storage (no persistence)
• Secrets management
• Abort logic
• Node executor registration
• Distributed rate limiting (needs Redis)

What Needs Fix ⚠️

• Permission mismatch (API allows level 1, schema requires admin)
• In-memory rate limiting (single instance only)
• Synchronous execution (blocks for long workflows)
• No caching layer

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Success Criteria for WorkflowLoaderV2

• Workflows validated before execution
• Invalid workflows return 400 with schema errors
• Unknown node types caught with specific error code
• Caching reduces database queries
• All error codes map to appropriate HTTP status
• Multi-tenant filtering enforced
• Tests pass (unit + integration + E2E)
• Zero regressions

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Key Metrics

Lines of Code

• Current implementation: 1,316 lines
• Missing (WorkflowLoaderV2): ~400 lines
• Total when complete: ~1,650 lines

Methods

• Implemented: 7 of 9
• Placeholders: 2 (loadWorkflow, saveExecutionRecord, etc)

Endpoints

• Implemented: 3
• Planned: 4+

Types

• Imported: 10 from @metabuilder/workflow
• Custom: 4

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Common Questions

Q: Why is the service only 40% complete?

A: Database integration, validation layer, and execution storage are missing. The infrastructure (auth, routing, error handling) is complete.

Q: When can this run real workflows?

A: After WorkflowLoaderV2 integration (2-3 hours) + DBAL implementation (1-2 hours).

Q: What happens if I execute a workflow now?

A: It loads null from database, then DAGExecutor fails with "workflow not found" error.

Q: Where should I start?

A: Create WorkflowLoaderV2 class in /frontends/nextjs/src/lib/workflow/workflow-loader.ts using code from WORKFLOW_LOADERV2_INTEGRATION_GUIDE.md.

Q: Is multi-tenant support working?

A: Partially. Routes validate tenantId, but database queries aren't implemented (placeholders).

Q: Can this scale to production?

A: Not yet. Rate limiting is in-memory (needs Redis), execution is synchronous (needs async queue).

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Document Statistics

Document	Lines	Focus	Audience
SUMMARY	350	Executive overview	Managers, Architects
LOADERV2 GUIDE	450	Implementation	Engineers
ENDPOINTS	600	API documentation	Frontend, Testers
SERVICE MAP	750	Technical details	Backend, System design

Total: ~2,150 lines of comprehensive documentation

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Related Files (Not Modified)

• /dbal/shared/api/schema/entities/core/workflow.yaml - Workflow schema
• /schemas/package-schemas/workflow.schema.json - Validation schema
• /frontends/nextjs/src/lib/db-client.ts - DBAL client (wrapper)
• @metabuilder/workflow - Core execution engine

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Change Log

2026-01-22: Complete analysis and documentation

• Analyzed service architecture
• Created 4 comprehensive documents
• Identified all integration points
• Provided implementation roadmap
• Ready for development

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Next Action

Immediate (in priority order):

1. Read WORKFLOW_SERVICE_ANALYSIS_SUMMARY.md (15 min)
2. Read WORKFLOW_LOADERV2_INTEGRATION_GUIDE.md (20 min)
3. Implement WorkflowLoaderV2 class (2-3 hours)
4. Test with real workflows

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Contact & Support

For questions about:

• Architecture: See NEXTJS_WORKFLOW_SERVICE_MAP.md
• API usage: See WORKFLOW_ENDPOINTS_REFERENCE.md
• Implementation: See WORKFLOW_LOADERV2_INTEGRATION_GUIDE.md
• Status/decisions: See WORKFLOW_SERVICE_ANALYSIS_SUMMARY.md

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Documentation Complete ✅ Ready for Implementation 🚀