@arcaputo3
Basic information
A quick and easy way to deploy MCP servers using Scala
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"fast-mcp-scala": {
"command": "npx",
"args": [
"@modelcontextprotocol/inspector",
"scala-cli",
"scripts/quickstart.sc"
]
}
}
}Tool list not available yet
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Fetch the live tool list by running this server in a temporary sandbox using the button above.
FastMCP-Scala is a Scala 3 library for building Model Context Protocol (MCP) servers. It provides annotation-driven and typed-contract APIs that run on both the JVM and Scala.js/Bun, targeting developers who want a low-ceremony way to expose tools, resources, and prompts to LLM clients via the MCP protocol.
Add the library dependency for JVM (%%) or Scala.js (%%%), then extend McpServerApp[Stdio, Self.type] or McpServerApp[Http, Self.type] and declare tools with @Tool annotations. The trait handles annotation scanning, schema derivation, and transport lifecycle automatically. For typed contracts, override tools, prompts, staticResources, or templateResources with McpTool, McpPrompt, etc.
Annotations (`@Tool` + `scanAnnotations`) require no extra wiring and are best for quick servers, while typed contracts (`McpTool`, `McpPrompt`, etc.) are first-class values that support testing, composition, and cross-module sharing. Both can coexist on the same server.
JVM requires JDK 17+ and the Java MCP SDK 1.1.1. Scala.js requires Scala.js 1.x and runs on Bun (first-class) or Node 18+, using the TypeScript MCP SDK 1.29.0.
Tasks are experimental and off by default. They are enabled per server via `McpServerSettings(tasks = TaskSettings(enabled = true))` and opt-in per tool. On JVM, Tasks only work with the built-in HTTP transport (`stateless = false`); stdio and stateless HTTP fail-fast if Tasks are enabled.
Transport is a compile-time phantom type: `Stdio` (for Claude Desktop, MCP Inspector) or `Http` (for remote clients, load balancers). The HTTP mode serves the full Streamable HTTP spec with optional stateless mode, and runs on a configurable port (default 8000).
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