MCP-scala

Model Context Protocol server written in Scala 3

- Automatic derivation of JSON Schema
- Define your tool
- Text content part
- Other content parts
- Notification handling
- Capability handling
- stdio transport
- HTTP transport
- Authorization feature

This implementation needs your attention and contribution.

Feel free to open Issue / PR to contribute this project.

Then, utilize server in your MCP client:

// Example for Cline { "mcpServers": { "mcpscala": { "disabled": false, "timeout": 30, "command": "sh", "args": ["/path/to/run.sh"], "transportType": "stdio" } } }

- randomNumber

- generate random number betweenmintomax.

- generate a sequence of numbers frommintomax.

- calculate the sum of a sequence of numbers.

//> using scala 3 //> using toolkit typelevel:default //> using dep dev.capslock::mcpscala:0.1.0 package dev.capslock.mcpscala import cats.effect.IO import cats.effect.IOApp import dev.capslock.mcpscala.transport.StdioServer import dev.capslock.mcpscala.mcp.ContentPart import sttp.tapir.Schema.annotations.description case class RandomNumberInput( @description("Minimum value (inclusive)") min: Int, @description("Maximum value (exclusive)") max: Int ) derives io.circe.Decoder, sttp.tapir.Schema def randomNumber(input: RandomNumberInput): IO[Seq[ContentPart]] = IO { val random = scala.util.Random.between(input.min, input.max) Seq(ContentPart.TextContentPart(random.toString)) } /* Entry point for the Stdio server. / object StdioMain extends McpIOApp( name = "random-number", header = "Generate a random number", ): val handlers = Handler.methodHandlers( Map( "randomNumber" -> server.Tool(randomNumber), ) )

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