Scala Mcp
What is Scala Mcp
scala-mcp is a library implementing the Model Context Protocol for Scala 3, designed to facilitate communication between tools and applications using a structured context.
Use cases
Use cases for scala-mcp include building language servers, integrating development tools, and creating applications that require efficient data exchange in a structured format.
How to use
To use scala-mcp, you need to have Scala 3.7.0 or above. You can create a minimal MCP server by importing the library, defining request handlers, and running the server using the MCP Inspector.
Key features
Key features include a code generator that implements a subset of the Model Context Protocol, a minimal runtime for JSON serialization, and a basic JSON-RPC 2.0 implementation.
Where to use
scala-mcp can be used in software development environments where structured communication between tools is necessary, such as IDEs, code analysis tools, and other development utilities.
Clients Supporting MCP
The following are the main client software that supports the Model Context Protocol. Click the link to visit the official website for more information.
Overview
What is Scala Mcp
scala-mcp is a library implementing the Model Context Protocol for Scala 3, designed to facilitate communication between tools and applications using a structured context.
Use cases
Use cases for scala-mcp include building language servers, integrating development tools, and creating applications that require efficient data exchange in a structured format.
How to use
To use scala-mcp, you need to have Scala 3.7.0 or above. You can create a minimal MCP server by importing the library, defining request handlers, and running the server using the MCP Inspector.
Key features
Key features include a code generator that implements a subset of the Model Context Protocol, a minimal runtime for JSON serialization, and a basic JSON-RPC 2.0 implementation.
Where to use
scala-mcp can be used in software development environments where structured communication between tools is necessary, such as IDEs, code analysis tools, and other development utilities.
Clients Supporting MCP
The following are the main client software that supports the Model Context Protocol. Click the link to visit the official website for more information.
Content
Model Context Protocol for Scala 3
This is a WIP library implementing the Model Context Protocol.
At the moment the library consists of three parts:
- Code generator that uses JSON schema from MCP to implement a subset of the protocol
- Minimal runtime to help serialising structures in JSON
- Minimal jsonrpc runtime implementing JSONRPC 2.0 protocol
Note that the jsonrpc implementation does not support cancellation, and is generally not designed for serious usage – but it’s great to get things off the ground quickly! In the future, this library will provide an integration with jsonrpclib, once that library is published for Scala Native 0.5 (or may be earlier, if someone works on that integration).
Getting Started
Note that the library is using Scala 3.7 – which is generally fine for apps, as you can use any version of Scala above 3.7
//> using scala 3.7.0
//> using dep com.indoorvivants::mcp-quick::latest.release
import mcp.*
@main def hello =
val mcp = MCPBuilder
.create()
.handle(initialize): req =>
InitializeResult(
capabilities =
ServerCapabilities(tools = Some(ServerCapabilities.Tools())),
protocolVersion = req.protocolVersion,
serverInfo = Implementation("scala-mcp", "0.0.1")
)
.run(SyncTransport.default)
end hello
Save it in a mcp.scala file and run it with MCP Inspector:
npx @modelcontextprotocol/inspector scala-cli run mcp.scala
For a more involved example, containing tool usage and bi-directional communication, see the sample.
See it in action
You can run the provided sample using MCP inspector as long as you have Scala CLI and npx installed:
npx @modelcontextprotocol/inspector make run-sample
The sample loads and works in the MCP inspector:
And can be configured in Claude desktop:
Dev Tools Supporting MCP
The following are the main code editors that support the Model Context Protocol. Click the link to visit the official website for more information.
