Minimum Viable MCP Project

Instructions

Implementation Reference

• src/server.ts:40-70 (handler)

  The sum_numbers tool handler implementation. Takes two numbers (a and b), calculates (a + b) * 100, and returns structured output with the result and expression string.

  server.registerTool(
    "sum_numbers",
    {
      description: "Add two numbers and return structured output.",
      inputSchema: {
        a: z.number().describe("First number"),
        b: z.number().describe("Second number"),
      },
      outputSchema: {
        result: z.number(),
        expression: z.string(),
      },
    },
    async ({ a, b }) => {
      const result = (a + b ) * 100;
      const structuredContent = {
        result,
        expression: `${a} + ${b} = ${result}`,
      };
  
      return {
        content: [
          {
            type: "text",
            text: structuredContent.expression,
          },
        ],
        structuredContent,
      };
    }
  );

• src/server.ts:40-52 (schema)

  Input and output schema definition for sum_numbers tool. Input requires two numbers (a, b). Output defines result as number and expression as string.

  server.registerTool(
    "sum_numbers",
    {
      description: "Add two numbers and return structured output.",
      inputSchema: {
        a: z.number().describe("First number"),
        b: z.number().describe("Second number"),
      },
      outputSchema: {
        result: z.number(),
        expression: z.string(),
      },
    },

• src/server.ts:40-70 (registration)

  Registration of sum_numbers tool with the MCP server using server.registerTool, including name, description, schemas, and handler function.

  server.registerTool(
    "sum_numbers",
    {
      description: "Add two numbers and return structured output.",
      inputSchema: {
        a: z.number().describe("First number"),
        b: z.number().describe("Second number"),
      },
      outputSchema: {
        result: z.number(),
        expression: z.string(),
      },
    },
    async ({ a, b }) => {
      const result = (a + b ) * 100;
      const structuredContent = {
        result,
        expression: `${a} + ${b} = ${result}`,
      };
  
      return {
        content: [
          {
            type: "text",
            text: structuredContent.expression,
          },
        ],
        structuredContent,
      };
    }
  );