モデルコンテキストプロトコル (MCP) 入門: スケーラブルなAIアプリケーションのための重要性¶

---
title: MCP Server Architecture and Component Interactions
description: A diagram showing how AI models interact with MCP servers and various tools, depicting the request flow and server components including Tool Registry, Authentication, Request Handler, and Response Formatter
---
graph TD
    A[AI Model in MCP Host] <-->|MCP Protocol| B[MCP Server]
    B <-->|Tool Interface| C[Tool 1: Web Search]
    B <-->|Tool Interface| D[Tool 2: Calculator]
    B <-->|Tool Interface| E[Tool 3: Database Access]
    B <-->|Tool Interface| F[Tool 4: File System]

    Client[MCP Client/Application] -->|Sends Request| A
    A -->|Returns Response| Client

    subgraph "MCP Server Components"
        B
        G[Tool Registry]
        H[Authentication]
        I[Request Handler]
        J[Response Formatter]
    end

    B <--> G
    B <--> H
    B <--> I
    B <--> J

    style A fill:#f9d5e5,stroke:#333,stroke-width:2px
    style B fill:#eeeeee,stroke:#333,stroke-width:2px
    style Client fill:#d5e8f9,stroke:#333,stroke-width:2px
    style C fill:#c2f0c2,stroke:#333,stroke-width:1px
    style D fill:#c2f0c2,stroke:#333,stroke-width:1px
    style E fill:#c2f0c2,stroke:#333,stroke-width:1px
    style F fill:#c2f0c2,stroke:#333,stroke-width:1px    

---
title: Scalable Agent Solution with MCP
description: A diagram illustrating how a user interacts with an LLM that connects to multiple MCP servers, with each server providing both knowledge and tools, creating a scalable AI system architecture
---
graph TD
    User -->|Prompt| LLM
    LLM -->|Response| User
    LLM -->|MCP| ServerA
    LLM -->|MCP| ServerB
    ServerA -->|Universal connector| ServerB
    ServerA --> KnowledgeA
    ServerA --> ToolsA
    ServerB --> KnowledgeB
    ServerB --> ToolsB

    subgraph Server A
        KnowledgeA[Knowledge]
        ToolsA[Tools]
    end

    subgraph Server B
        KnowledgeB[Knowledge]
        ToolsB[Tools]
    end

---
title: Advanced MCP Scenarios with Client-Server LLM Integration
description: A sequence diagram showing the detailed interaction flow between user, client application, client LLM, multiple MCP servers, and server LLM, illustrating tool discovery, user interaction, direct tool calling, and feature negotiation phases
---
sequenceDiagram
    autonumber
    actor User as 👤 User
    participant ClientApp as 🖥️ Client App
    participant ClientLLM as 🧠 Client LLM
    participant Server1 as 🔧 MCP Server 1
    participant Server2 as 📚 MCP Server 2
    participant ServerLLM as 🤖 Server LLM

    %% Discovery Phase
    rect rgb(220, 240, 255)
        Note over ClientApp, Server2: TOOL DISCOVERY PHASE
        ClientApp->>+Server1: Request available tools/resources
        Server1-->>-ClientApp: Return tool list (JSON)
        ClientApp->>+Server2: Request available tools/resources
        Server2-->>-ClientApp: Return tool list (JSON)
        Note right of ClientApp: Store combined tool<br/>catalog locally
    end

    %% User Interaction
    rect rgb(255, 240, 220)
        Note over User, ClientLLM: USER INTERACTION PHASE
        User->>+ClientApp: Enter natural language prompt
        ClientApp->>+ClientLLM: Forward prompt + tool catalog
        ClientLLM->>-ClientLLM: Analyze prompt & select tools
    end

    %% Scenario A: Direct Tool Calling
    alt Direct Tool Calling
        rect rgb(220, 255, 220)
            Note over ClientApp, Server1: SCENARIO A: DIRECT TOOL CALLING
            ClientLLM->>+ClientApp: Request tool execution
            ClientApp->>+Server1: Execute specific tool
            Server1-->>-ClientApp: Return results
            ClientApp->>+ClientLLM: Process results
            ClientLLM-->>-ClientApp: Generate response
            ClientApp-->>-User: Display final answer
        end

    %% Scenario B: Feature Negotiation (VS Code style)
    else Feature Negotiation (VS Code style)
        rect rgb(255, 220, 220)
            Note over ClientApp, ServerLLM: SCENARIO B: FEATURE NEGOTIATION
            ClientLLM->>+ClientApp: Identify needed capabilities
            ClientApp->>+Server2: Negotiate features/capabilities
            Server2->>+ServerLLM: Request additional context
            ServerLLM-->>-Server2: Provide context
            Server2-->>-ClientApp: Return available features
            ClientApp->>+Server2: Call negotiated tools
            Server2-->>-ClientApp: Return results
            ClientApp->>+ClientLLM: Process results
            ClientLLM-->>-ClientApp: Generate response
            ClientApp-->>-User: Display final answer
        end
    end