README.md

Sample

This is a Rust sample for an MCP Server

Here's what the calculator portion looks like:

#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
pub struct CalculatorRequest {
    pub a: f64,
    pub b: f64,
}

#[tool_router]
impl Calculator {
    #[tool(description = "Adds a and b")]
    async fn add(
        &self,
        Parameters(CalculatorRequest { a, b }): Parameters<CalculatorRequest>,
    ) -> String {
        (a + b).to_string()
    }

    #[tool(description = "Subtracts b from a")]
    async fn subtract(
        &self,
        Parameters(CalculatorRequest { a, b }): Parameters<CalculatorRequest>,
    ) -> String {
        (a - b).to_string()
    }

    #[tool(description = "Multiply a with b")]
    async fn multiply(
        &self,
        Parameters(CalculatorRequest { a, b }): Parameters<CalculatorRequest>,
    ) -> String {
        (a * b).to_string()
    }

    #[tool(description = "Divides a by b")]
    async fn divide(
        &self,
        Parameters(CalculatorRequest { a, b }): Parameters<CalculatorRequest>,
    ) -> String {
        if b == 0.0 {
            "Error: Division by zero".to_string()
        } else {
            (a / b).to_string()
        }
    }
}

Install

Run the following command:

cargo build

Run

cargo run