cc4aa751b6First example of the binary server type — a compiled Rust MCP server packaged as an MCPB. Based on the official Rust SDK calculator example (rmcp 1.2.0, 2 tools: sum/sub, ~80 LOC). Includes Cargo.toml, Dockerfile for Docker-based builds, .mcpbignore to exclude source from the bundle, and README with build/pack/test instructions. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
80 lines
2.1 KiB
Rust
80 lines
2.1 KiB
Rust
use anyhow::Result;
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use rmcp::{
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ServerHandler, ServiceExt,
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handler::server::{router::tool::ToolRouter, wrapper::Parameters},
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model::{ServerCapabilities, ServerInfo},
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schemars, tool, tool_handler, tool_router,
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transport::stdio,
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};
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use tracing_subscriber::{self, EnvFilter};
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// --- Calculator types ---
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#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
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pub struct SumRequest {
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#[schemars(description = "the left hand side number")]
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pub a: i32,
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pub b: i32,
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}
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#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
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pub struct SubRequest {
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#[schemars(description = "the left hand side number")]
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pub a: i32,
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#[schemars(description = "the right hand side number")]
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pub b: i32,
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}
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// --- Calculator server ---
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#[derive(Debug, Clone)]
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pub struct Calculator {
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tool_router: ToolRouter<Self>,
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}
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#[tool_router]
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impl Calculator {
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pub fn new() -> Self {
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Self {
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tool_router: Self::tool_router(),
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}
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}
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#[tool(description = "Calculate the sum of two numbers")]
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fn sum(&self, Parameters(SumRequest { a, b }): Parameters<SumRequest>) -> String {
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(a + b).to_string()
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}
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#[tool(description = "Calculate the difference of two numbers")]
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fn sub(&self, Parameters(SubRequest { a, b }): Parameters<SubRequest>) -> String {
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(a - b).to_string()
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}
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}
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#[tool_handler]
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impl ServerHandler for Calculator {
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fn get_info(&self) -> ServerInfo {
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ServerInfo::new(ServerCapabilities::builder().enable_tools().build())
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.with_instructions("A simple calculator".to_string())
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}
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}
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// --- Main ---
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#[tokio::main]
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async fn main() -> Result<()> {
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tracing_subscriber::fmt()
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.with_env_filter(EnvFilter::from_default_env().add_directive(tracing::Level::DEBUG.into()))
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.with_writer(std::io::stderr)
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.with_ansi(false)
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.init();
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tracing::info!("Starting Calculator MCP server");
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let service = Calculator::new().serve(stdio()).await.inspect_err(|e| {
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tracing::error!("serving error: {:?}", e);
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})?;
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service.waiting().await?;
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Ok(())
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}
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