MCP SSE Sample

SSEを使用したMCPサーバーのサンプルです。 MCPプロトコルのSSE実装を示すサンプルプロジェクトです。

オリジナルは以下コードです。

• https://github.com/modelcontextprotocol/servers/tree/main/src/everything

Components

Tools

1. echo

   • Simple tool to echo back input messages
   • Input:
     • message (string): Message to echo back
   • Returns: Text content with echoed message

2. add

   • Adds two numbers together
   • Inputs:
     • a (number): First number
     • b (number): Second number
   • Returns: Text result of the addition

3. longRunningOperation

   • Demonstrates progress notifications for long operations
   • Inputs:
     • duration (number, default: 10): Duration in seconds
     • steps (number, default: 5): Number of progress steps
   • Returns: Completion message with duration and steps
   • Sends progress notifications during execution

4. sampleLLM

   • Demonstrates LLM sampling capability using MCP sampling feature
   • Inputs:
     • prompt (string): The prompt to send to the LLM
     • maxTokens (number, default: 100): Maximum tokens to generate
   • Returns: Generated LLM response

5. getTinyImage

   • Returns a small test image
   • No inputs required
   • Returns: Base64 encoded PNG image data

6. printEnv

   • Prints all environment variables
   • Useful for debugging MCP server configuration
   • No inputs required
   • Returns: JSON string of all environment variables

7. annotatedMessage

   • Demonstrates how annotations can be used to provide metadata about content
   • Inputs:
     • messageType (enum: "error" | "success" | "debug"): Type of message to demonstrate different annotation patterns
     • includeImage (boolean, default: false): Whether to include an example image
   • Returns: Content with varying annotations:
     • Error messages: High priority (1.0), visible to both user and assistant
     • Success messages: Medium priority (0.7), user-focused
     • Debug messages: Low priority (0.3), assistant-focused
     • Optional image: Medium priority (0.5), user-focused
   • Example annotations:

     {
       "priority": 1.0,
       "audience": ["user", "assistant"]
     }
     

Logging

The server sends random-leveled log messages every 15 seconds, e.g.:

{
  "method": "notifications/message",
  "params": {
	"level": "info",
	"data": "Info-level message"
  }
}

使用方法

ローカルでの実行

# インストール
npm install

# ビルド
npm run build

# 実行(STDIOモード)
npm run start

# 実行(SSEモード)
npm run start:sse

Claude Desktopでの使用

claude_desktop_config.jsonに以下を追加してください：

{
  "mcpServers": {
    "sse-sample": {
      "command": "npx",
      "args": [
        "-y",
        "mcp_sse_sample"
      ]
    }
  }
}