README.md

Sample

This is a JavaScript sample for an MCP Server

Here's what the calculator portion of it looks like:

// Define calculator tools for each operation
server.tool(
  "add",
  {
    a: z.number(),
    b: z.number()
  },
  async ({ a, b }) => ({
    content: [{ type: "text", text: String(a + b) }]
  })
);

server.tool(
  "subtract",
  {
    a: z.number(),
    b: z.number()
  },
  async ({ a, b }) => ({
    content: [{ type: "text", text: String(a - b) }]
  })
);

server.tool(
  "multiply",
  {
    a: z.number(),
    b: z.number()
  },
  async ({ a, b }) => ({
    content: [{ type: "text", text: String(a * b) }]
  })
);

server.tool(
  "divide",
  {
    a: z.number(),
    b: z.number()
  },
  async ({ a, b }) => {
    if (b === 0) {
      return {
        content: [{ type: "text", text: "Error: Cannot divide by zero" }],
        isError: true
      };
    }
    return {
      content: [{ type: "text", text: String(a / b) }]
    };
  }
);

Install

Run the following command:

npm install

Run

npm start