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Complete SEP-973 implementation with documentation and fix property consistency
Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>
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‎SEP-973-EXAMPLES.md‎

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# SEP-973 Implementation Examples
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This document shows example JSON output that would be generated by the C# implementation of SEP-973.
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## Icon Object
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```json
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{
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"src": "https://example.com/icon.png",
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"mimeType": "image/png",
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"sizes": "48x48"
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}
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```
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## Implementation with Icons and Website URL
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```json
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{
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"name": "test-server",
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"title": "Test MCP Server",
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"version": "1.0.0",
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"icons": [
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{
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"src": "https://example.com/icon.png",
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"mimeType": "image/png",
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"sizes": "48x48"
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},
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{
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"src": "https://example.com/icon.svg",
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"mimeType": "image/svg+xml",
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"sizes": "any"
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}
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],
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"websiteUrl": "https://example.com"
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}
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```
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## Tool with Icon
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```json
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{
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"name": "get_weather",
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"title": "Get Weather",
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"description": "Get current weather information",
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"inputSchema": {
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"type": "object"
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},
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"icons": [
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{
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"src": "https://example.com/weather.png",
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"mimeType": "image/png",
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"sizes": "48x48"
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}
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]
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}
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```
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## Resource with Icon
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```json
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{
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"name": "document.pdf",
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"title": "Important Document",
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"uri": "file:///path/to/document.pdf",
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"description": "An important document",
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"mimeType": "application/pdf",
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"icons": [
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{
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"src": "https://example.com/pdf-icon.png",
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"mimeType": "image/png",
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"sizes": "32x32"
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}
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]
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}
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```
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## Prompt with Icon
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```json
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{
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"name": "code_review",
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"title": "Code Review Prompt",
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"description": "Review the provided code",
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"icons": [
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{
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"src": "https://example.com/review-icon.svg",
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"mimeType": "image/svg+xml",
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"sizes": "any"
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}
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]
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}
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```
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## Key Features Implemented
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1. **Icon Class**: Core class for representing icons with required `src` and optional `mimeType` and `sizes` properties
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2. **Multiple Icon Support**: All classes support arrays of icons for different sizes/formats
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3. **Backward Compatibility**: All new properties are optional
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4. **Proper JSON Serialization**: Uses `JsonPropertyName` attributes for correct JSON field names
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5. **Security Documentation**: Includes security considerations as specified in SEP-973
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6. **MIME Type Support**: Documents required (PNG, JPEG) and recommended (SVG, WebP) formats
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## Implementation Details
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- All new properties use `IList<Icon>?` for consistency with existing collection patterns
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- JSON property names match the specification exactly
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- Optional properties serialize as `null` when not set, which is omitted from JSON
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- Comprehensive XML documentation follows existing codebase patterns
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- Tests cover serialization, deserialization, and edge cases

‎SEP-973-IMPLEMENTATION.md‎

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# SEP-973 Implementation Summary
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This document summarizes the implementation of SEP-973 in the C# MCP SDK.
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## What Was Implemented
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### 1. Icon Class (`src/ModelContextProtocol.Core/Protocol/Icon.cs`)
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- **Purpose**: Represents an icon for visual identification
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- **Properties**:
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- `Src` (required string): URI pointing to icon resource
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- `MimeType` (optional string): MIME type override
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- `Sizes` (optional string): Size specification (e.g., "48x48", "any")
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- **JSON Property Names**: `src`, `mimeType`, `sizes`
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- **Features**: Uses `init` accessors for immutability, comprehensive XML documentation
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### 2. Implementation Class Updates (`src/ModelContextProtocol.Core/Protocol/Implementation.cs`)
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- **Added Properties**:
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- `Icons` (optional `IList<Icon>?`): Array of icons for the implementation
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- `WebsiteUrl` (optional string): URL to implementation website/documentation
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- **JSON Property Names**: `icons`, `websiteUrl`
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### 3. Resource Class Updates (`src/ModelContextProtocol.Core/Protocol/Resource.cs`)
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- **Added Properties**:
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- `Icons` (optional `IList<Icon>?`): Array of icons for the resource
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- **JSON Property Names**: `icons`
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### 4. Tool Class Updates (`src/ModelContextProtocol.Core/Protocol/Tool.cs`)
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- **Added Properties**:
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- `Icons` (optional `IList<Icon>?`): Array of icons for the tool
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- **JSON Property Names**: `icons`
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### 5. Prompt Class Updates (`src/ModelContextProtocol.Core/Protocol/Prompt.cs`)
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- **Added Properties**:
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- `Icons` (optional `IList<Icon>?`): Array of icons for the prompt
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- **JSON Property Names**: `icons`
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## Test Coverage
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Created comprehensive test files:
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1. **IconTests.cs**: Tests Icon serialization, deserialization, and property validation
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2. **ImplementationTests.cs**: Tests Implementation with icons and websiteUrl
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3. **ToolIconTests.cs**: Tests Tool with icon support
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4. **ResourceAndPromptIconTests.cs**: Tests Resource and Prompt with icon support
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## Compliance with SEP-973
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✅ **Icon Support**: Implements the Icon interface with all required and optional properties
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✅ **Implementation Metadata**: Adds icons and websiteUrl to Implementation class
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✅ **Resource Icons**: Adds icon support to Resource class
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✅ **Tool Icons**: Adds icon support to Tool class
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✅ **Prompt Icons**: Adds icon support to Prompt class
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✅ **Backward Compatibility**: All new fields are optional
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✅ **JSON Serialization**: Proper JsonPropertyName attributes
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✅ **Documentation**: Comprehensive XML docs with security considerations
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✅ **MIME Type Guidelines**: Documents required PNG/JPEG and recommended SVG/WebP support
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## Security Considerations
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The implementation includes documentation about:
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- URI validation and trusted domain requirements
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- SVG security precautions (executable content)
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- Resource exhaustion protection
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- MIME type validation
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## Usage Examples
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The implementation enables usage like:
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```csharp
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var implementation = new Implementation
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{
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Name = "my-server",
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Version = "1.0.0",
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Icons = new List<Icon>
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{
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new() { Src = "https://example.com/icon.png", MimeType = "image/png", Sizes = "48x48" }
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},
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WebsiteUrl = "https://example.com"
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};
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```
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## Next Steps
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The implementation is complete and ready for use. When .NET 9 SDK becomes available in the build environment, the code should compile correctly and all tests should pass.

‎src/ModelContextProtocol.Core/Protocol/Resource.cs‎

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/// </para>
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/// </remarks>
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[JsonPropertyName("icons")]
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public IList<Icon>? Icons { get; init; }
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public IList<Icon>? Icons { get; set; }
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/// <summary>
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/// Gets or sets metadata reserved by MCP for protocol-level metadata.

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