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Fast MCP Scala

TJC-LP/fast-mcp-scala

Scala 3 for MCP: annotation-driven and typed-contract APIs on the JVM, Scala.js/Bun, and Scala Native. fast-mcp-scala is a developer-friendly library for building Model Context Protocol servers. Extend one trait, declare your tools, done:.

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Install

Client configuration

{
  "mcpServers": {
    "fast-mcp-scala-example": {
      "command": "scala-cli",
      "args": [
        "-e",
        "//> using scala 3.9.0",
        "-e",
        "//> using dep com.tjclp::fast-mcp-scala:1.0.1",
        "--main-class",
        "com.tjclp.fastmcp.examples.AnnotatedServer"
      ]
    }
  }
}
GitHub stars
1
Author
@TJC-LP
Category
Developer Tools, AI Chatbot
License
MIT
Updated
Oct 6, 2026

About Fast MCP Scala

Scala 3 for MCP: annotation-driven and typed-contract APIs on the JVM, Scala.js/Bun, and Scala Native.

fast-mcp-scala is a developer-friendly library for building Model Context Protocol servers. Extend one trait, declare your tools, done:

Tools (7)

  • examples

    populates the JSON Schema examples array (clients can show suggestions)

  • schema

    is a raw JSON Schema fragment that overrides the derived schema entirely — repeat the description inside the fragment, since the derived property (description…

  • readOnlyHint

    The tool only reads state; safe to call without confirmation

  • destructiveHint

    The tool may irreversibly modify state; clients should confirm

  • idempotentHint

    Repeated calls with the same args have the effect of one call

  • openWorldHint

    The tool reaches outside the local process (network, filesystem, APIs)

  • returnDirect

    Return the result directly to the user, skipping LLM post-processing

Details on this page are taken from the project's README. Open README

Supported clients

Clients mentioned in this server's README:

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