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Metals MCP Server Tools - Debug Report (Debugged with AI Agent)

1. Introduction

This report summarizes the results of an investigation into the behavior of tools provided by the Metals MCP server. The investigation was based on the information about MCP support found in the Metals release notes.

Test Environment:

JVM: OpenJDK 24
Metals Version: 1.5.3

	import scala.math.BigInt

	/** Common math utilities */
	object MathUtils:
	@annotation.tailrec
	def gcd(a: BigInt, b: BigInt): BigInt =
	if b == 0 then a.abs else gcd(b, a % b)

	//////////////////////////////////////////////////////////////
	// 1. Rational labels : p / q ------------------------------------------------

	// DSL

	trait 監獄[Repr]:
	def 入獄(罪人たち: Seq[(Int, 罪人[String])]): Unit
	def 点呼(): Repr

	trait 罪人[Repr]:
	def 触る(): Repr
	def 逮捕()(using 監獄[Repr]): Repr
	def ごめんなさい(): Repr

	import cats.effect.kernel.Resource
	import cats.effect.IO
	import cats.data.EitherT

	trait Client {
	def get(uri: String): IO[String]
	}
	val client: Resource[IO, Client] = Resource.pure(new {
	def get(uri: String): IO[String] = IO.pure("result")
	})

	//> using scala 3.4.0
	//> using dep "com.outr::scribe::3.13.2"

	// run via:
	// scala-cli -J --add-modules -J jdk.incubator.vector -J -Xmx16G vector.scala.sc

	import jdk.incubator.vector.*
	import scribe._

	def mult2a(arr: Array[Double]): Array[Double] = arr.map(_ * 1.618)

	//> using scala 3.3.0

	import java.awt.Desktop
	import java.net.URI

	if (Desktop.isDesktopSupported) {
	Desktop.getDesktop.browse(new URI("https://scala-cli.virtuslab.org/"))
	}

	package dev.capslock.gist.scalacli

	object Greeting:
	def hello(name: String): String = s"Hello, $name!"

	//> using scala 3.3.0
	//> using dep org.http4s::http4s-ember-server:0.23.23
	//> using dep org.http4s::http4s-dsl:0.23.23

	import cats.effect._
	import com.comcast.ip4s._
	import org.http4s.HttpRoutes
	import org.http4s._
	import org.http4s.dsl.io._
	import org.http4s.ember.server._