docs(mcp): Complete Phase 3 Runtime Testing and Validation
Phase 3 runtime testing has been completed with critical findings: - Microsoft MCP SDK is registered but NOT actually used at runtime - Application uses custom HTTP-based MCP implementation instead of SDK's stdio - SDK tools (Ping, GetServerTime, GetProjectInfo) discovered but not exposed - Requires architecture decision: Remove SDK, Use SDK properly, or Hybrid approach Test artifacts: - Complete test report with detailed analysis - Summary document for quick reference - Runtime test scripts (PowerShell) - API key creation utilities (SQL + PowerShell) Key findings: - Transport mismatch: SDK expects stdio, app uses HTTP - Tool discovery works but not integrated with custom handler - Cannot verify DI in SDK tools (tools never called) - Claude Desktop integration blocked (requires stdio) Next steps: 1. Make architecture decision (Remove/Use/Hybrid) 2. Either remove SDK or implement stdio transport 3. Bridge SDK tools to custom handler if keeping SDK Test Status: Phase 3 Complete (Blocked on architecture decision) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Yaojia Wang
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docs/mcp-sdk-phase3-summary.md
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docs/mcp-sdk-phase3-summary.md
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# MCP SDK Phase 3: Runtime Test Summary
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**Date**: 2025-11-09
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**Status**: ⚠️ **BLOCKED - Architecture Decision Required**
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---
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## TL;DR
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The Microsoft MCP SDK (ModelContextProtocol v0.4.0-preview.3) is **registered in DI but NOT actually used** at runtime. ColaFlow has a custom HTTP-based MCP implementation that works independently of the SDK.
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---
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## Key Findings
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### 🔴 Critical Issue: SDK Not Functional
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```csharp
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// In Program.cs - SDK is registered
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builder.Services.AddMcpServer()
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.WithToolsFromAssembly()
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.WithResourcesFromAssembly();
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// But custom handler is used instead
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app.UseMcpMiddleware(); // <- Custom implementation, not SDK
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```
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**Evidence:**
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- Application uses custom HTTP endpoint `/mcp` (not SDK's stdio)
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- Logs show "MCP Protocol Handler initialized" (custom, not SDK)
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- SDK tools (Ping, GetServerTime, GetProjectInfo) are discovered but never called
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- No stdio transport (SDK's primary feature)
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---
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## What Works ✅
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1. **Application Startup**: Starts successfully on port 5167
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2. **Custom MCP Endpoint**: `/mcp` endpoint operational
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3. **Resource Discovery**: 6 resources registered via custom registry
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4. **API Key Auth**: Custom authentication middleware works
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5. **Health Check**: `/health` endpoint returns 200 OK
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---
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## What Doesn't Work ❌
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1. **Microsoft MCP SDK**: Not integrated with custom handler
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2. **SDK stdio Transport**: Not implemented (only HTTP exists)
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3. **SDK Tool Discovery**: Tools discovered but not exposed
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4. **Claude Desktop Integration**: Impossible (requires stdio)
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5. **Dependency Injection in SDK Tools**: Cannot verify (tools never called)
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---
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## Architecture Mismatch
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### Expected (SDK):
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```
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Claude Desktop → stdio → MCP SDK → Tools/Resources
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```
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### Actual (Current):
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```
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Web Client → HTTP → Custom Handler → Custom Tools/Resources
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(SDK ignored)
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```
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---
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## Test Results Summary
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| Component | Expected | Actual | Status |
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|-----------|----------|--------|--------|
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| Transport | stdio | HTTP | ❌ Mismatch |
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| Endpoint | stdin/stdout | `/mcp` | ❌ Mismatch |
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| Tool Discovery | SDK `.WithToolsFromAssembly()` | Custom registry | ⚠️ Partial |
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| Resource Discovery | SDK `.WithResourcesFromAssembly()` | Custom registry | ✅ Works (custom) |
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| Authentication | SDK built-in | Custom API Key | ✅ Works (custom) |
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| DI in Tools | SDK constructor injection | N/A | ❌ Untestable |
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---
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## Critical Questions
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### Q1: Should we use Microsoft MCP SDK at all?
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**Option A: Remove SDK** (Recommended for short-term)
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- ✅ Simpler architecture
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- ✅ Custom implementation is working
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- ❌ No Claude Desktop integration
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- ❌ Non-standard MCP protocol
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**Option B: Use SDK Properly** (Recommended for long-term)
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- ✅ Standard MCP protocol
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- ✅ Claude Desktop integration
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- ❌ Requires stdio transport implementation
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- ❌ More complex (hybrid approach)
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**Option C: Hybrid** (Best of both worlds)
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- ✅ HTTP for web clients (current)
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- ✅ stdio for Claude Desktop (new)
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- ✅ Shared tool/resource registry
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- ❌ Most complex to implement
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---
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## Recommendation
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### Short-term: **Option A - Remove SDK**
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```csharp
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// Remove from Program.cs
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// builder.Services.AddMcpServer()
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// .WithToolsFromAssembly()
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// .WithResourcesFromAssembly();
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// Remove from ColaFlow.API.csproj
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// <PackageReference Include="ModelContextProtocol" Version="0.4.0-preview.3" />
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// Keep custom implementation
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app.UseMcpMiddleware(); // This works
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```
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**Reasoning:**
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- SDK is not being used
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- Custom implementation is functional
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- Reduces confusion and maintenance burden
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- Can re-evaluate SDK in future when it's more mature (currently preview)
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### Long-term: **Option C - Hybrid**
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```csharp
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// Keep custom HTTP for web
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app.MapPost("/mcp", CustomMcpHandler);
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// Add SDK stdio for Claude Desktop
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if (app.Environment.IsDevelopment())
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{
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app.UseStdioMcpServer(); // <- To be implemented
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}
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```
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**Benefits:**
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- Best user experience for all clients
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- Standard MCP protocol support
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- Flexibility for different use cases
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---
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## Next Actions
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1. **Decision Required**: Choose Option A, B, or C
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2. **If Option A** (Remove SDK):
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- Remove NuGet package
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- Remove SDK registration
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- Update documentation
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- Continue with custom implementation
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3. **If Option B/C** (Use SDK):
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- Implement stdio transport
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- Bridge SDK tools to custom handler
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- Test with Claude Desktop
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- Document both approaches
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---
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## Files Generated
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- ✅ `docs/mcp-sdk-phase3-runtime-test-report.md` - Full detailed report
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- ✅ `docs/mcp-sdk-phase3-summary.md` - This summary
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- ✅ `scripts/test-mcp-runtime.ps1` - Runtime test script
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- ✅ `scripts/create-test-api-key.ps1` - API key creation script
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---
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## Contact
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For questions or decisions, please consult:
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- Architect agent (architecture decisions)
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- Product Manager (user requirements)
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- Backend agent (implementation)
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---
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**Status**: Awaiting architecture decision before proceeding to Phase 4
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