MCP Demo Server

Instructions

Implementation Reference

• demo.ts:107-130 (handler)

  The handler logic for the 'greet' tool. It destructures the input arguments, selects a greeting message based on the language (defaulting to English), and returns it as text content.

  if (name === "greet") {
    const { name: personName, language = "en" } = args as {
      name: string;
      language?: string;
    };
  
    const greetings: Record<string, string> = {
      en: `Hello, ${personName}! How are you today?`,
      zh: `你好，${personName}！今天过得怎么样？`,
      es: `¡Hola, ${personName}! ¿Cómo estás hoy?`,
      fr: `Bonjour, ${personName}! Comment allez-vous aujourd'hui?`,
    };
  
    const greeting = greetings[language] || greetings.en;
  
    return {
      content: [
        {
          type: "text",
          text: greeting,
        },
      ],
    };
  }

• demo.ts:46-60 (schema)

  Input schema for the 'greet' tool defining the expected parameters: required 'name' (string) and optional 'language' (string enum).

  inputSchema: {
    type: "object",
    properties: {
      name: {
        type: "string",
        description: "Name of the person to greet",
      },
      language: {
        type: "string",
        description: "Language for the greeting",
        enum: ["en", "zh", "es", "fr"],
      },
    },
    required: ["name"],
  },

• demo.ts:43-61 (registration)

  Registration of the 'greet' tool in the ListTools response, including name, description, and full input schema.

  {
    name: "greet",
    description: "Generate a personalized greeting",
    inputSchema: {
      type: "object",
      properties: {
        name: {
          type: "string",
          description: "Name of the person to greet",
        },
        language: {
          type: "string",
          description: "Language for the greeting",
          enum: ["en", "zh", "es", "fr"],
        },
      },
      required: ["name"],
    },
  },

• demo.ts:113-118 (helper)

  Helper constant mapping languages to greeting templates used in the handler.

  const greetings: Record<string, string> = {
    en: `Hello, ${personName}! How are you today?`,
    zh: `你好，${personName}！今天过得怎么样？`,
    es: `¡Hola, ${personName}! ¿Cómo estás hoy?`,
    fr: `Bonjour, ${personName}! Comment allez-vous aujourd'hui?`,
  };