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Basic Calculator MCP Service

This service offers basic calculator functions through the Model Context Protocol (MCP) using Spring Boot with WebFlux transport. It’s designed as a simple example for those new to MCP implementations.

For more details, see the MCP Server Boot Starter reference documentation.

Using the Service

The service provides the following API endpoints via the MCP protocol:

  • add(a, b): Add two numbers
  • subtract(a, b): Subtract the second number from the first
  • multiply(a, b): Multiply two numbers
  • divide(a, b): Divide the first number by the second (checks for zero)
  • power(base, exponent): Calculate the power of a number
  • squareRoot(number): Calculate the square root (checks for negative numbers)
  • modulus(a, b): Calculate the remainder of a division
  • absolute(number): Calculate the absolute value

Dependencies

The project depends on the following key libraries:

<dependency>
    <groupId>org.springframework.ai</groupId>
    <artifactId>spring-ai-starter-mcp-server-webflux</artifactId>
</dependency>

Building the Project

Build the project using Maven:

./mvnw clean install -DskipTests

Running the Server

Using Java

java -jar target/calculator-server-0.0.1-SNAPSHOT.jar

Using MCP Inspector

MCP Inspector is a handy tool for working with MCP services. To use it with this calculator service:

  1. Install and start MCP Inspector in a new terminal window:

    npx @modelcontextprotocol/inspector

  2. Open the web UI by clicking the URL shown by the app (usually http://localhost:6274)

  3. Set up the connection:

    • Choose "SSE" as the transport type
    • Enter your server’s SSE endpoint URL: http://localhost:8080/sse
    • Click "Connect"

  4. Use the tools:

    • Click "List Tools" to view available calculator operations
    • Select a tool and click "Run Tool" to perform an operation

MCP Inspector Screenshot

Penafian:
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