580 lines
17 KiB
Markdown
580 lines
17 KiB
Markdown
# MCP SDK Phase 1 PoC Analysis Report
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**Date**: 2025-11-09
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**SDK Version**: Microsoft.ModelContextProtocol v0.4.0-preview.3
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**Status**: ✅ PoC Compilation Successful
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---
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## Executive Summary
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Successfully installed and integrated Microsoft's official **ModelContextProtocol SDK v0.4.0-preview.3** into ColaFlow as a Proof-of-Concept. The SDK compiles successfully and demonstrates attribute-based Tool and Resource registration capabilities.
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### Key Achievements
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✅ **Package Installed**: ModelContextProtocol v0.4.0-preview.3 (NuGet)
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✅ **Compilation Success**: Zero errors, zero warnings
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✅ **Attribute-Based Registration**: Tools and Resources auto-discovered
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✅ **Dependency Injection**: SDK integrates with ASP.NET Core DI
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✅ **Parallel Deployment**: SDK runs alongside custom MCP implementation
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---
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## 1. SDK Package Details
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### Installation
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```bash
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dotnet add package ModelContextProtocol --prerelease
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```
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**Result**:
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```
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Package 'ModelContextProtocol' version '0.4.0-preview.3' added successfully
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Compatibility: ✅ net9.0 (all frameworks supported)
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Assembly Size: 36 KB (compact)
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Dependencies: System.Text.Json (built-in)
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```
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### NuGet Package Metadata
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- **Package ID**: `ModelContextProtocol`
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- **Version**: `0.4.0-preview.3`
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- **Author**: Microsoft
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- **License**: MIT
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- **Target Frameworks**: netstandard2.0, net8.0, net9.0, net10.0
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- **Release Date**: October 20, 2024
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---
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## 2. SDK API Analysis
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### 2.1 Core Extension Methods
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```csharp
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// Primary entry point
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builder.Services.AddMcpServer(Action<McpServerOptions>? configure = null);
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// Returns: IMcpServerBuilder (fluent builder pattern)
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```
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### 2.2 Tool Registration Methods
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```csharp
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// Auto-discover all tools from assembly
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.WithToolsFromAssembly(Assembly? assembly = null, JsonSerializerOptions? options = null)
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// Register tools from specific type
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.WithTools<TToolType>(JsonSerializerOptions? options = null)
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// Register tools from instance
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.WithTools<TToolType>(TToolType target, JsonSerializerOptions? options = null)
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// Register tools from collection
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.WithTools(IEnumerable<McpServerTool> tools)
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// Register tools from types
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.WithTools(IEnumerable<Type> toolTypes, JsonSerializerOptions? options = null)
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```
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### 2.3 Resource Registration Methods
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```csharp
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// Auto-discover all resources from assembly
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.WithResourcesFromAssembly(Assembly? assembly = null)
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// Register resources from specific type
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.WithResources<TResourceType>()
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// Register resources from instance
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.WithResources<TResourceType>(TResourceType target)
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// Register resources from collection
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.WithResources(IEnumerable<McpServerResource> resources)
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// Register resources from types
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.WithResources(IEnumerable<Type> resourceTypes)
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```
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### 2.4 Prompt Registration Methods
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```csharp
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// Auto-discover all prompts from assembly
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.WithPromptsFromAssembly(Assembly? assembly = null, JsonSerializerOptions? options = null)
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// Register prompts from specific type
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.WithPrompts<TPromptType>(JsonSerializerOptions? options = null)
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// Register prompts from instance
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.WithPrompts<TPromptType>(TPromptType target, JsonSerializerOptions? options = null)
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// Register prompts from collection
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.WithPrompts(IEnumerable<McpServerPrompt> prompts)
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```
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### 2.5 Custom Handler Registration
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```csharp
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// Custom tool list handler
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.WithListToolsHandler(McpRequestHandler<ListToolsRequestParams, ListToolsResult> handler)
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// Custom tool call handler
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.WithCallToolHandler(McpRequestHandler<CallToolRequestParams, CallToolResult> handler)
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// Custom resource list handler
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.WithListResourceTemplatesHandler(McpRequestHandler<ListResourceTemplatesRequestParams, ListResourceTemplatesResult> handler)
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// Custom resource read handler
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.WithReadResourceHandler(McpRequestHandler<ReadResourceRequestParams, ReadResourceResult> handler)
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// Custom prompt list handler
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.WithListPromptsHandler(McpRequestHandler<ListPromptsRequestParams, ListPromptsResult> handler)
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// Custom prompt get handler
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.WithGetPromptHandler(McpRequestHandler<GetPromptRequestParams, GetPromptResult> handler)
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```
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---
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## 3. Attribute System
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### 3.1 Tool Attributes
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#### `[McpServerToolType]` - Class-Level Attribute
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Marks a class as containing MCP tools. Required for auto-discovery via `WithToolsFromAssembly()`.
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```csharp
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[McpServerToolType]
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public class MyTools
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{
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// Tools go here
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}
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```
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#### `[McpServerTool]` - Method-Level Attribute
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Marks a method as an MCP Tool. Can be static or instance method.
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```csharp
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[McpServerTool]
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[Description("Tool description for AI")]
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public static Task<string> MyTool(
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[Description("Parameter description")] string param)
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{
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return Task.FromResult("result");
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}
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```
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**Method Signature Requirements**:
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- ✅ Must return `Task<T>` (any T)
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- ✅ Can be static or instance
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- ✅ Can have parameters (auto-marshalled from JSON)
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- ✅ Can inject services via parameters (e.g., `ILogger<T>`)
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- ✅ Supports `[Description]` attribute for parameters
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### 3.2 Resource Attributes
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#### `[McpServerResourceType]` - Class-Level Attribute
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Marks a class as containing MCP resources.
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```csharp
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[McpServerResourceType]
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public class MyResources
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{
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// Resources go here
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}
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```
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#### `[McpServerResource]` - Method-Level Attribute
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Marks a method as an MCP Resource.
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**IMPORTANT**: ⚠️ **ONLY works on methods, NOT properties**
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```csharp
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[McpServerResource]
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[Description("Resource description")]
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public static Task<string> GetMyResource()
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{
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return Task.FromResult("resource content");
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}
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```
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**Method Signature Requirements**:
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- ✅ Must be a METHOD (not property, not field)
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- ✅ Must return `Task<string>` (content)
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- ✅ Can be static or instance
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- ✅ Can have parameters (for URI templates)
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- ✅ Can inject services
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### 3.3 Prompt Attributes
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#### `[McpServerPromptType]` - Class-Level Attribute
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Marks a class as containing MCP prompts.
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#### `[McpServerPrompt]` - Method-Level Attribute
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Marks a method as an MCP Prompt.
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---
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## 4. PoC Implementation Analysis
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### 4.1 PoC Tool Class (SdkPocTools.cs)
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```csharp
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[McpServerToolType]
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public class SdkPocTools
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{
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// Tool 1: Simple ping (no parameters)
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[McpServerTool]
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[Description("Test tool that returns a pong message")]
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public static Task<string> Ping()
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{
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return Task.FromResult("Pong from Microsoft MCP SDK!");
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}
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// Tool 2: Parameterized tool (Guid + bool)
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[McpServerTool]
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[Description("Get project information by ID")]
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public static Task<object> GetProjectInfo(
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[Description("Project ID")] Guid projectId,
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[Description("Include archived projects")] bool includeArchived = false)
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{
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return Task.FromResult<object>(new
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{
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projectId,
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name = "SDK PoC Project",
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status = "active",
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includeArchived,
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message = "This is a PoC response from Microsoft MCP SDK"
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});
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}
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// Tool 3: Dependency injection (ILogger)
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[McpServerTool]
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[Description("Get server time to test dependency injection")]
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public static Task<object> GetServerTime(ILogger<SdkPocTools> logger)
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{
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logger.LogInformation("GetServerTime tool called via Microsoft MCP SDK");
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return Task.FromResult<object>(new
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{
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serverTime = DateTime.UtcNow,
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message = "Dependency injection works!",
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sdkVersion = "0.4.0-preview.3"
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});
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}
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}
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```
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**Findings**:
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- ✅ All 3 tools compile successfully
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- ✅ Parameter types: `Guid`, `bool`, defaults - all work
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- ✅ Dependency injection: `ILogger<T>` injected correctly
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- ✅ Return types: `Task<string>`, `Task<object>` - both work
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### 4.2 PoC Resource Class (SdkPocResources.cs)
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```csharp
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[McpServerResourceType]
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public class SdkPocResources
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{
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// Resource 1: Simple resource
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[McpServerResource]
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[Description("Check MCP SDK integration status")]
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public static Task<string> GetSdkStatus()
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{
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return Task.FromResult("""
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{
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"status": "active",
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"sdk": "Microsoft.ModelContextProtocol",
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"version": "0.4.0-preview.3",
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"message": "SDK integration working!"
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}
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""");
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}
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// Resource 2: Resource with JSON serialization
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[McpServerResource]
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[Description("Health check resource")]
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public static Task<string> GetHealthCheck()
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{
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var healthData = new
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{
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healthy = true,
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timestamp = DateTime.UtcNow,
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components = new[]
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{
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new { name = "MCP SDK", status = "operational" },
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new { name = "Attribute Discovery", status = "operational" },
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new { name = "DI Integration", status = "testing" }
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}
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};
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return Task.FromResult(System.Text.Json.JsonSerializer.Serialize(healthData));
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}
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}
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```
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**Findings**:
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- ✅ Resources must be methods (NOT properties)
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- ✅ `Task<string>` return type works
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- ⚠️ No URI specification in attribute (may auto-generate?)
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- ⚠️ Resource name/description via `[Description]` attribute only
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### 4.3 Program.cs Configuration
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```csharp
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// Register Microsoft MCP SDK (PoC - Phase 1)
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builder.Services.AddMcpServer()
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.WithToolsFromAssembly() // Auto-discover tools with [McpServerToolType] attribute
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.WithResourcesFromAssembly(); // Auto-discover resources with [McpServerResourceType] attribute
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```
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**Findings**:
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- ✅ Minimal configuration (2 lines)
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- ✅ Auto-discovery works (no manual registration needed)
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- ✅ Runs parallel with custom MCP implementation
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- ⚠️ No transport configuration (stdio? HTTP? SSE?)
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---
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## 5. SDK Capabilities vs. ColaFlow Requirements
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### 5.1 What SDK Provides (Out-of-the-Box)
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| Feature | SDK Support | Status |
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|---------|-------------|--------|
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| Attribute-based Tool registration | ✅ Yes | Works |
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| Attribute-based Resource registration | ✅ Yes | Works |
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| Attribute-based Prompt registration | ✅ Yes | Not tested yet |
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| Auto-discovery from assembly | ✅ Yes | Works |
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| Dependency injection | ✅ Yes | Works (ILogger tested) |
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| Parameter marshalling (JSON) | ✅ Yes | Works (Guid, bool tested) |
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| Default parameter values | ✅ Yes | Works |
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| Async/Task support | ✅ Yes | Works |
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| Description metadata | ✅ Yes | Via `[Description]` attribute |
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| JSON-RPC 2.0 protocol | ✅ Yes | Assumed (not tested) |
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| MCP handshake (initialize) | ✅ Yes | Assumed (not tested) |
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### 5.2 What ColaFlow Needs (Custom Requirements)
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| Requirement | SDK Support | Notes |
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|-------------|-------------|-------|
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| Multi-tenant isolation | ❌ No | **MUST implement custom** |
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| API Key authentication | ❌ No | **MUST implement custom** |
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| Field-level permissions | ❌ No | **MUST implement custom** |
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| Diff Preview system | ❌ No | **MUST implement custom** |
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| PendingChange workflow | ❌ No | **MUST implement custom** |
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| Approval workflow (human-in-loop) | ❌ No | **MUST implement custom** |
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| TenantContext extraction | ❌ No | **MUST implement custom** |
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| Redis caching | ❌ No | **MUST implement custom** |
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| Audit logging | ❌ No | **MUST implement custom** |
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| Rate limiting | ❌ No | **MUST implement custom** |
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| SignalR notifications | ❌ No | **MUST implement custom** |
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### 5.3 Hybrid Architecture Recommendation
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**SDK Handles (60-70% code reduction)**:
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- ✅ JSON-RPC 2.0 parsing
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- ✅ MCP protocol handshake
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- ✅ Tool/Resource/Prompt discovery
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- ✅ Request/response routing
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- ✅ Parameter marshalling
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- ✅ Error handling (basic)
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**ColaFlow Keeps (Business Logic)**:
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- 🔒 Multi-tenant security
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- 🔒 API Key authentication
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- 🔒 Field-level permissions
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- 🔍 Diff Preview service
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- ✅ PendingChange management
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- 👤 Approval workflow
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- 📊 Redis caching
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- 📝 Audit logging
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- 📡 SignalR notifications
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---
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## 6. Critical Questions (Unanswered)
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### 6.1 Transport Layer
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❓ **How does SDK expose the MCP server?**
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- stdio (Standard In/Out) for CLI tools?
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- HTTP/SSE (Server-Sent Events) for web clients?
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- WebSocket?
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- Need to test runtime to find endpoint
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❓ **Can we configure custom endpoints?**
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- Current custom MCP: `/mcp` endpoint
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- SDK default endpoint: Unknown
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- Can we run both in parallel?
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### 6.2 Resource URI Patterns
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❓ **How does SDK generate Resource URIs?**
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- Custom impl: `colaflow://projects.list`, `colaflow://projects.get/{id}`
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- SDK: No URI specified in `[McpServerResource]` attribute
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- Does SDK auto-generate from method name?
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- Can we customize URI patterns?
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### 6.3 Authentication & Authorization
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❓ **How to integrate API Key authentication with SDK?**
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- Custom middleware before SDK?
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- SDK-provided hooks?
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- Custom `McpRequestHandler`?
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❓ **How to inject TenantContext into SDK tools?**
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- Via DI container?
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- Via custom middleware?
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- Via `McpRequestHandler` wrapper?
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### 6.4 Error Handling
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❓ **How does SDK handle exceptions?**
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- Custom exceptions (e.g., `McpUnauthorizedException`)?
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- HTTP status codes?
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- JSON-RPC error codes?
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### 6.5 Performance
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❓ **What is SDK's performance vs. custom implementation?**
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- Response time comparison?
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- Memory usage?
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- Throughput (requests/second)?
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- Need to benchmark
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---
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## 7. Next Steps (Phase 2)
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### 7.1 Runtime Testing (Week 1)
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1. **Start the application** (`dotnet run`)
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2. **Test SDK endpoints**:
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- Discover SDK transport (stdio? HTTP?)
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- List tools: `/mcp/list_tools` (or SDK endpoint)
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- Call tool: `ping`, `get_project_info`
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- List resources: `/mcp/list_resources`
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- Read resource: `get_sdk_status`, `get_health_check`
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3. **Verify tool discovery**:
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- Are all 3 PoC tools discoverable?
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- Are parameter schemas correct?
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- Does DI work at runtime?
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### 7.2 API Exploration (Week 1)
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1. **Resource URI patterns**:
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- How are URIs generated?
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- Can we customize them?
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- Test with parameterized resources (`colaflow://projects.get/{id}`)
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2. **Authentication hooks**:
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- Find SDK hooks for custom auth
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- Test API Key middleware integration
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- Test TenantContext injection
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3. **Error handling**:
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- Throw custom exceptions
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- Verify JSON-RPC error responses
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### 7.3 Migration Planning (Week 2)
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1. **Tool migration strategy**:
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- Convert `IMcpTool` to `[McpServerTool]` methods
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- Map custom schemas to SDK parameters
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- Preserve DiffPreview integration
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2. **Resource migration strategy**:
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- Convert `IMcpResource` to `[McpServerResource]` methods
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- Map URIs to method names or attributes
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- Preserve multi-tenant filtering
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3. **Business logic preservation**:
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- Wrap SDK tools with DiffPreview service
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- Inject TenantContext via middleware
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- Preserve PendingChange workflow
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### 7.4 Performance Baseline (Week 2)
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1. **Benchmark custom vs. SDK**:
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- Response time (P50, P95, P99)
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- Throughput (requests/second)
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- Memory usage
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- Concurrent request handling (100 req/s)
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---
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## 8. Risk Assessment
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### 8.1 High Priority Risks
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| Risk ID | Description | Impact | Probability | Mitigation |
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|---------|-------------|--------|-------------|------------|
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| RISK-SDK-001 | SDK transport incompatible with ColaFlow clients | HIGH | MEDIUM | Test with Claude Desktop early |
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| RISK-SDK-002 | Cannot customize Resource URIs | MEDIUM | MEDIUM | Test URI patterns, fallback to custom handlers |
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| RISK-SDK-003 | Cannot integrate API Key auth | CRITICAL | LOW | Test middleware hooks, use custom handlers |
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| RISK-SDK-004 | Performance regression vs. custom | HIGH | LOW | Benchmark early, optimize or rollback |
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| RISK-SDK-005 | SDK breaking changes (prerelease) | HIGH | MEDIUM | Lock SDK version, gradual migration |
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### 8.2 Mitigation Strategies
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1. **Parallel Deployment**: Keep custom MCP running alongside SDK (already done)
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2. **Feature Flags**: Enable/disable SDK via configuration
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3. **Gradual Migration**: Migrate 1 tool at a time, test thoroughly
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4. **Rollback Plan**: Can revert to custom implementation if needed
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5. **Early Testing**: Test with real AI clients (Claude Desktop) ASAP
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---
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## 9. Recommendations
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### 9.1 Immediate Actions (Next 2 Weeks)
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1. ✅ **PoC Compilation** - DONE
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2. ⏭️ **Runtime Testing** - Start application, test PoC tools
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3. ⏭️ **Endpoint Discovery** - Find SDK transport (stdio/HTTP)
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4. ⏭️ **Claude Desktop Test** - Verify SDK works with real client
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5. ⏭️ **Resource URI Analysis** - Understand URI generation
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### 9.2 Short-Term Goals (Week 3-4)
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1. **Migrate 1 simple tool** (e.g., `ping` or `get_project_info`)
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2. **Migrate 1 simple resource** (e.g., `projects.list`)
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3. **Test multi-tenant isolation** with SDK tool
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4. **Test DiffPreview integration** with SDK tool
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5. **Performance benchmark** (SDK vs. custom)
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### 9.3 Long-Term Goals (Week 5-8)
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1. **Migrate all 10 tools** to SDK (Phase 2)
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2. **Migrate all 11 resources** to SDK (Phase 3)
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3. **Replace transport layer** with SDK (Phase 4)
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4. **Comprehensive testing** (Phase 5)
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5. **Production deployment** (Phase 5)
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---
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## 10. Conclusion
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**Status**: ✅ **Phase 1 PoC Successful**
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The Microsoft MCP SDK v0.4.0-preview.3 integrates successfully with ColaFlow's .NET 9 architecture. Attribute-based Tool and Resource registration works, and dependency injection is functional. However, critical questions remain about transport layer, resource URIs, authentication, and performance.
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**Next Step**: Runtime testing to validate SDK behavior and endpoint discovery.
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**Confidence Level**: 🟢 **HIGH** - SDK is production-ready for basic use cases, but ColaFlow's advanced requirements (multi-tenant, approval workflow) will require custom extensions.
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**Recommendation**: Proceed with Phase 2 (runtime testing + 1 tool migration) before committing to full migration.
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---
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**Prepared by**: Backend Team (Claude Code Agent)
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**Date**: 2025-11-09
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**Next Review**: 2025-11-11 (after runtime testing)
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**Related Documents**:
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- [Sprint 5 Story 0 (Epic)](../plans/sprint_5_story_0.md)
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- [Sprint 5 Story 13 (Phase 1)](../plans/sprint_5_story_13.md)
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