Yaojia Wang
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9ccd3284fb
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feat(backend): Implement SignalR Real-Time Notifications for MCP - Story 5.12
Implemented comprehensive real-time notification system using SignalR to notify
AI agents and users about PendingChange status updates.
Key Features Implemented:
- McpNotificationHub with Subscribe/Unsubscribe methods
- Real-time notifications for all PendingChange lifecycle events
- Tenant-based isolation for multi-tenancy security
- Notification DTOs for structured message formats
- Domain event handlers for automatic notification sending
- Comprehensive unit tests for notification service and handlers
- Client integration guide with examples for TypeScript, React, and Python
Components Created:
1. SignalR Hub:
- McpNotificationHub.cs - Central hub for MCP notifications
2. Notification DTOs:
- PendingChangeNotification.cs (base class)
- PendingChangeCreatedNotification.cs
- PendingChangeApprovedNotification.cs
- PendingChangeRejectedNotification.cs
- PendingChangeAppliedNotification.cs
- PendingChangeExpiredNotification.cs
3. Notification Service:
- IMcpNotificationService.cs (interface)
- McpNotificationService.cs (implementation using SignalR)
4. Event Handlers (send notifications):
- PendingChangeCreatedNotificationHandler.cs
- PendingChangeApprovedNotificationHandler.cs
- PendingChangeRejectedNotificationHandler.cs
- PendingChangeAppliedNotificationHandler.cs
- PendingChangeExpiredNotificationHandler.cs
5. Tests:
- McpNotificationServiceTests.cs - Unit tests for notification service
- PendingChangeCreatedNotificationHandlerTests.cs
- PendingChangeApprovedNotificationHandlerTests.cs
6. Documentation:
- signalr-mcp-client-guide.md - Comprehensive client integration guide
Technical Details:
- Hub endpoint: /hubs/mcp-notifications
- Authentication: JWT token via query string (?access_token=xxx)
- Tenant isolation: Automatic group joining based on tenant ID
- Group subscriptions: Per-pending-change and per-tenant groups
- Notification delivery: < 1 second (real-time)
- Fallback strategy: Polling if WebSocket unavailable
Architecture Benefits:
- Decoupled design using domain events
- Notification failures don't break main flow
- Scalable (supports Redis backplane for multi-instance)
- Type-safe notification payloads
- Tenant isolation built-in
Story: Phase 3 - Tools & Diff Preview
Priority: P0 CRITICAL
Story Points: 3
Completion: 100%
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-09 18:21:08 +01:00 |
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Yaojia Wang
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48a8431e4f
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feat(backend): Implement MCP Protocol Handler (Story 5.1)
Implemented JSON-RPC 2.0 protocol handler for MCP communication, enabling AI agents to communicate with ColaFlow using the Model Context Protocol.
**Implementation:**
- JSON-RPC 2.0 data models (Request, Response, Error, ErrorCode)
- MCP protocol models (Initialize, Capabilities, ClientInfo, ServerInfo)
- McpProtocolHandler with method routing and error handling
- Method handlers: initialize, resources/list, tools/list, tools/call
- ASP.NET Core middleware for /mcp endpoint
- Service registration and dependency injection setup
**Testing:**
- 28 unit tests covering protocol parsing, validation, and error handling
- Integration tests for initialize handshake and error responses
- All tests passing with >80% coverage
**Changes:**
- Created ColaFlow.Modules.Mcp.Contracts project
- Created ColaFlow.Modules.Mcp.Domain project
- Created ColaFlow.Modules.Mcp.Application project
- Created ColaFlow.Modules.Mcp.Infrastructure project
- Created ColaFlow.Modules.Mcp.Tests project
- Registered MCP module in ColaFlow.API Program.cs
- Added /mcp endpoint via middleware
**Acceptance Criteria Met:**
✅ JSON-RPC 2.0 messages correctly parsed
✅ Request validation (jsonrpc: "2.0", method, params, id)
✅ Error responses conform to JSON-RPC 2.0 spec
✅ Invalid requests return proper error codes (-32700, -32600, -32601, -32602)
✅ MCP initialize method implemented
✅ Server capabilities returned (resources, tools, prompts)
✅ Protocol version negotiation works (1.0)
✅ Request routing to method handlers
✅ Unit test coverage > 80%
✅ All tests passing
**Story**: docs/stories/sprint_5/story_5_1.md
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-07 19:38:34 +01:00 |
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