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Implementation Phases - Development Roadmap

Overview

This document provides a phased approach to implementing the MCP Server Client Inspector. Each phase builds upon the previous one, with clear deliverables and testing checkpoints.

Phase Overview

Phase 1: Foundation       (Week 1) → Basic infrastructure
Phase 2: Core Features    (Week 2) → Testing capabilities
Phase 3: Polish & Testing (Week 3) → Multi-client & refinement
Phase 4: Release Prep     (Week 4) → Documentation & deployment

Phase 1: Foundation (Week 1)

Goal

Establish the basic infrastructure for both MCP server and Fresh UI.

Deliverables

1.1 Project Setup

  • Create repository structure
  • Initialize both mcp-server/ and fresh-ui/ directories
  • Set up deno.json configurations
  • Create .env.example files
  • Set up .gitignore

Files to Create:

bb-mcp-server-client-inspector/
├── README.md
├── .gitignore
├── mcp-server/
│   ├── deno.json
│   ├── .env.example
│   └── main.ts (placeholder)
└── fresh-ui/
    ├── deno.json
    ├── .env.example
    └── main.ts (placeholder)

Reference Documents:

  • PROJECT_OVERVIEW.md (Project Structure section)
  • MCP_SERVER_DESIGN.md (Configuration section)

1.2 MCP Server Foundation

  • Implement main.ts entry point
  • Create dependencyHelper.ts
  • Set up basic AppServer initialization
  • Implement environment configuration
  • Test STDIO transport mode

Files to Create:

mcp-server/
├── main.ts
└── src/
    └── dependencyHelper.ts

Reference Documents:

  • MCP_SERVER_DESIGN.md (Entry Point, Dependency Helper sections)
  • ARCHITECTURE.md (MCP Server Components section)

Testing:

  • Server starts successfully
  • Environment variables are loaded
  • STDIO transport initializes

1.3 Inspector Tools

  • Create inspector plugin structure
  • Implement echo tool
  • Implement convert_date tool
  • Implement calculate tool
  • Write unit tests for each tool

Files to Create:

mcp-server/src/plugins/inspector.plugin/
├── plugin.ts
└── tools/
    ├── echo.ts
    ├── convertDate.ts
    └── calculate.ts

Reference Documents:

  • MCP_SERVER_DESIGN.md (Inspector Tools section)
  • DATA_MODELS.md (for type definitions)

Testing:

  • Each tool executes correctly
  • Parameter validation works
  • Error handling is correct
  • Unit test coverage >80%

1.4 Console Infrastructure

  • Implement MessageTracker class
  • Set up Deno KV storage
  • Implement basic session management
  • Write tests for MessageTracker

Files to Create:

mcp-server/src/console/
├── MessageTracker.ts
└── types.ts

Reference Documents:

  • MCP_SERVER_DESIGN.md (Console Integration section)
  • DATA_MODELS.md (Storage Schema section)
  • ARCHITECTURE.md (Message Tracker section)

Testing:

  • Messages are stored correctly
  • Message retrieval works
  • Client tracking functions
  • KV operations are correct

1.5 Fresh UI Foundation

  • Initialize Fresh project
  • Set up main route
  • Create basic layout
  • Implement WebSocket hook skeleton

Files to Create:

fresh-ui/
├── main.ts
├── dev.ts
├── fresh.config.ts
├── routes/
│   └── index.tsx
└── hooks/
    └── useWebSocket.ts

Reference Documents:

  • FRESH_UI_DESIGN.md (Entry Points, Routes sections)
  • WEBSOCKET_PROTOCOL.md (Connection Establishment)

Testing:

  • Fresh server starts
  • Main page renders
  • Hot reload works

Phase 1 Checkpoint

Success Criteria:

  • ✅ MCP server starts and responds to tool calls
  • ✅ Three basic inspector tools working
  • ✅ Message storage operational
  • ✅ Fresh UI serves main page
  • ✅ All unit tests passing

Estimated Time: 5-7 days

Phase 2: Core Features (Week 2)

Goal

Implement the core testing capabilities: sampling, elicitation, and notifications.

Deliverables

2.1 WebSocket Communication

  • Implement ConsoleManager class
  • Add WebSocket endpoint to MCP server
  • Implement message broadcasting
  • Complete useWebSocket hook in UI
  • Test WebSocket connection and messaging

Files to Create:

mcp-server/src/console/
└── ConsoleManager.ts

fresh-ui/hooks/
└── useWebSocket.ts (complete implementation)

Reference Documents:

  • MCP_SERVER_DESIGN.md (Console Manager section)
  • FRESH_UI_DESIGN.md (WebSocket Hook section)
  • WEBSOCKET_PROTOCOL.md (entire document)
  • ARCHITECTURE.md (Data Flow section)

Testing:

  • WebSocket connection establishes
  • Messages are sent/received
  • Reconnection works
  • Error handling is correct

2.2 Remaining Inspector Tools

  • Implement delay_response tool
  • Implement random_data tool
  • Implement trigger_error tool
  • Write unit tests for new tools

Files to Create:

mcp-server/src/plugins/inspector.plugin/tools/
├── delayResponse.ts
├── randomData.ts
└── triggerError.ts

Reference Documents:

  • MCP_SERVER_DESIGN.md (Inspector Tools section)

Testing:

  • All tools function correctly
  • Edge cases handled
  • Complete test coverage

2.3 Connection Status Island

  • Implement ConnectionStatus component
  • Display connection state
  • Show connection ID
  • Handle connection errors

Files to Create:

fresh-ui/islands/
└── ConnectionStatus.tsx

Reference Documents:

  • FRESH_UI_DESIGN.md (Connection Status Island section)
  • DATA_MODELS.md (UI State Types)

Testing:

  • Component renders correctly
  • Connection state updates
  • Error messages display

2.4 Message Viewer Island

  • Implement MessageViewer component
  • Display protocol messages
  • Add message filtering
  • Implement auto-scroll
  • Add message detail view

Files to Create:

fresh-ui/islands/
└── MessageViewer.tsx

Reference Documents:

  • FRESH_UI_DESIGN.md (Message Viewer Island section)
  • WEBSOCKET_PROTOCOL.md (Server-to-Console Messages)

Testing:

  • Messages display correctly
  • Filtering works
  • Auto-scroll functions
  • Detail view works

2.5 Sampling Implementation

  • Add sampling support to ConsoleManager
  • Implement SamplingForm island
  • Handle sampling requests and responses
  • Add error handling
  • Write integration tests

Files to Create:

fresh-ui/islands/
└── SamplingForm.tsx

Reference Documents:

  • FRESH_UI_DESIGN.md (Sampling Form Island section)
  • WEBSOCKET_PROTOCOL.md (Sampling messages)
  • DATA_MODELS.md (Sampling types)
  • MCP_SERVER_DESIGN.md (Console Manager)

Testing:

  • Form validation works
  • Requests are sent correctly
  • Responses are displayed
  • Errors are handled

2.6 Elicitation Implementation

  • Add elicitation support to ConsoleManager
  • Implement ElicitationForm island
  • Handle elicitation requests and responses
  • Add schema input handling
  • Write integration tests

Files to Create:

fresh-ui/islands/
└── ElicitationForm.tsx

Reference Documents:

  • FRESH_UI_DESIGN.md (Elicitation Form Island section)
  • WEBSOCKET_PROTOCOL.md (Elicitation messages)
  • DATA_MODELS.md (Elicitation types)

Testing:

  • Form works correctly
  • Schema validation
  • All response types handled
  • Error handling works

2.7 Notification Triggering

  • Implement notification handling in ConsoleManager
  • Create NotificationTrigger island
  • Add notification confirmation
  • Write integration tests

Files to Create:

fresh-ui/islands/
└── NotificationTrigger.tsx

Reference Documents:

  • FRESH_UI_DESIGN.md (Notification Trigger Island section)
  • WEBSOCKET_PROTOCOL.md (Notification messages)
  • DATA_MODELS.md (Notification types)

Testing:

  • All notification types work
  • Confirmation messages display
  • Multiple clients receive notifications

Phase 2 Checkpoint

Success Criteria:

  • ✅ WebSocket communication fully functional
  • ✅ All inspector tools implemented and tested
  • ✅ Sampling requests work end-to-end
  • ✅ Elicitation requests work end-to-end
  • ✅ Notifications can be triggered and verified
  • ✅ Message viewer displays all activity
  • ✅ Integration tests passing

Estimated Time: 6-8 days

Phase 3: Multi-Client & Polish (Week 3)

Goal

Add multi-client support, refine the UI, and ensure production-quality code.

Deliverables

3.1 Multi-Client Support

  • Implement client tracking in MessageTracker
  • Create ClientSelector island
  • Add client-specific message filtering
  • Test with multiple simultaneous clients

Files to Create:

fresh-ui/islands/
└── ClientSelector.tsx

Reference Documents:

  • FRESH_UI_DESIGN.md (Client Selector Island section)
  • ARCHITECTURE.md (Multi-Client Support)
  • DATA_MODELS.md (Client info types)

Testing:

  • Multiple clients tracked correctly
  • Client selector displays all clients
  • Messages filtered by client
  • Client status updates

3.2 Shared Types

  • Create shared types directory
  • Move common types to shared location
  • Update imports in both projects
  • Ensure type consistency

Files to Create:

shared/types/
├── console.types.ts
├── mcp.types.ts
└── common.types.ts

Reference Documents:

  • DATA_MODELS.md (all type definitions)

Testing:

  • No type errors
  • Types work in both projects
  • Type guards function correctly

3.3 UI Polish

  • Improve layout and styling
  • Add loading states
  • Enhance error messages
  • Add tooltips and help text
  • Improve responsive design

Files to Update:

  • All island components
  • Main route
  • CSS styles

Reference Documents:

  • FRESH_UI_DESIGN.md (Styling section)

Testing:

  • UI looks professional
  • Loading states work
  • Error messages are clear
  • Responsive on different screens

3.4 Error Handling Enhancement

  • Add comprehensive error handling
  • Improve error messages
  • Add error recovery
  • Test error scenarios

Files to Update:

  • ConsoleManager.ts
  • All tool handlers
  • All UI islands

Reference Documents:

  • ARCHITECTURE.md (Error Handling Strategy)
  • MCP_SERVER_DESIGN.md (error handling patterns)

Testing:

  • All error paths tested
  • Error messages are helpful
  • Recovery works where applicable

3.5 Performance Optimization

  • Optimize message broadcasting
  • Add message pagination
  • Implement virtual scrolling
  • Optimize WebSocket reconnection

Files to Update:

  • ConsoleManager.ts
  • MessageViewer.tsx
  • useWebSocket.ts

Reference Documents:

  • ARCHITECTURE.md (Performance Considerations)
  • WEBSOCKET_PROTOCOL.md (Performance section)

Testing:

  • Large message volumes handled
  • UI remains responsive
  • Memory usage is reasonable

Phase 3 Checkpoint

Success Criteria:

  • ✅ Multiple clients supported
  • ✅ UI is polished and professional
  • ✅ Comprehensive error handling
  • ✅ Performance is acceptable
  • ✅ All tests passing

Estimated Time: 6-8 days

Phase 4: Release Preparation (Week 4)

Goal

Complete documentation, create examples, and prepare for open-source release.

Deliverables

4.1 Documentation Completion

  • Write comprehensive README.md
  • Create CONTRIBUTING.md
  • Write QUICKSTART.md
  • Document environment variables
  • Create troubleshooting guide

Files to Create:

├── README.md
├── CONTRIBUTING.md
├── QUICKSTART.md
├── TROUBLESHOOTING.md
└── docs/
    └── DEPLOYMENT.md

Reference Documents:

  • All design documents
  • PROJECT_OVERVIEW.md (for README content)

4.2 Example Scenarios

  • Create example test scenarios
  • Document common test patterns
  • Add usage examples to README

Files to Create:

examples/
├── basic-tool-testing.md
├── sampling-workflow.md
├── elicitation-testing.md
└── notification-testing.md

4.3 Comprehensive Testing

  • Complete all unit tests
  • Complete all integration tests
  • Add end-to-end tests
  • Achieve >80% coverage
  • Fix all identified issues

Reference Documents:

  • TESTING_STRATEGY.md (entire document)

Testing:

  • All tests passing
  • Coverage targets met
  • No critical bugs
  • Performance acceptable

4.4 Deployment Preparation

  • Create Dockerfile (optional)
  • Document deployment steps
  • Test local deployment
  • Create deployment scripts

Files to Create:

├── Dockerfile (optional)
├── docker-compose.yml (optional)
└── scripts/
    ├── start-dev.sh
    └── start-prod.sh

4.5 Release Checklist

  • Version all components
  • Update all documentation
  • Test on clean install
  • Create release notes
  • Tag release in git

Phase 4 Checkpoint

Success Criteria:

  • ✅ Complete documentation
  • ✅ Example scenarios provided
  • ✅ All tests passing with >80% coverage
  • ✅ Deployment documented and tested
  • ✅ Ready for open-source release

Estimated Time: 6-8 days

Roadmap (Future Versions)

Version 1.1 (Post-Release)

  • 🔄 Multi-turn sampling conversations
  • 🔄 Streaming response support
  • 🔄 Message filtering in UI
  • 🔄 Pre-configured test scenarios

Version 1.2

  • 🔄 Advanced sampling configurations
  • 🔄 Multi-step elicitation flows
  • 🔄 Structured form builder for elicitation
  • 🔄 Session export/import

Version 1.3

  • 🔄 Custom notification types
  • 🔄 Notification frequency/rate testing
  • 🔄 Client metrics and analytics
  • 🔄 WebSocket token authentication

Version 2.0

  • 🔄 Advanced testing suite
  • 🔄 Performance benchmarking
  • 🔄 Test scenario recording/playback
  • 🔄 Client behavior analysis

Implementation Tips

Best Practices

  1. Start Small: Implement the minimum viable feature first
  2. Test Early: Write tests alongside implementation
  3. Iterate Quickly: Get feedback early and often
  4. Document as You Go: Update docs when implementing
  5. Commit Frequently: Small, focused commits

Common Pitfalls

  1. Skipping Tests: Always write tests for new features
  2. Ignoring Types: Use TypeScript strictly, avoid any
  3. Premature Optimization: Focus on correctness first
  4. Over-Engineering: Keep it simple, add complexity only when needed
  5. Poor Error Messages: Make errors actionable and clear

Development Workflow

# Terminal 1: MCP Server
cd mcp-server
deno task dev

# Terminal 2: Fresh UI
cd fresh-ui
deno task dev

# Terminal 3: Tests (run on changes)
cd mcp-server
deno test --allow-all --watch tests/

Git Workflow

# Feature branch
git checkout -b feature/phase1-foundation

# Commit frequently
git add -p
git commit -m "feat: implement echo tool"

# Push and create PR
git push origin feature/phase1-foundation

Code Review Checklist

  • Code follows TypeScript best practices
  • Tests are comprehensive
  • Documentation is updated
  • Error handling is complete
  • Performance is acceptable
  • No console errors or warnings

Quick Reference

Phase 1 Focus

  • 🎯 Foundation and basic infrastructure
  • 🛠️ Basic inspector tools
  • 💾 Message storage
  • 🎨 Basic UI setup

Phase 2 Focus

  • 🔌 WebSocket communication
  • 🧠 Sampling capability
  • ❓ Elicitation capability
  • 🔔 Notification triggering

Phase 3 Focus

  • 📱 Multi-client support
  • ✨ UI polish
  • ⚡ Performance optimization
  • 🐛 Error handling

Phase 4 Focus

  • 📝 Documentation
  • 📚 Examples
  • ✅ Testing completion
  • 🚀 Release preparation

Document Version: 1.0 Last Updated: 2025-10-22 Status: Design Complete - Ready for Implementation