metals
Scala language server with rich IDE features
TLDR
Install Metals using Coursier
$ cs bootstrap org.scalameta:metals_2.13:[version] -o metals -f
Start Metals as an MCP server for a workspace$ metals-mcp --workspace [/path/to/project]
Start Metals MCP server on a specific port$ metals-mcp --workspace [/path/to/project] --port [8080]
Generate editor config for a specific client$ metals-mcp --workspace [/path/to/project] --client [vscode]
SYNOPSIS
metals [options]metals-mcp --workspace path [options]
DESCRIPTION
Metals is a Scala language server implementing the Language Server Protocol (LSP). It provides IDE features like code completion, navigation, refactoring, and error checking for Scala projects.Metals works with various editors including VS Code, Vim/Neovim, Emacs, and Sublime Text.
PARAMETERS
--workspace path
Path to the Scala project (required for MCP server).--port number
HTTP port to listen on. Auto-assigned by default.--transport type
Transport type: http (default) or stdio.--client name
Client to generate config for (e.g., vscode, cursor).-v, --version
Print version information.-h, --help
Print usage message.
SUPPORTED BUILD TOOLS
$ - sbt
- Mill
- Gradle
- Maven
- Bloop
- Mill
- Gradle
- Maven
- Bloop
FEATURES
$ - Code completion
- Go to definition
- Find references
- Rename refactoring
- Code actions
- Diagnostics
- Go to definition
- Find references
- Rename refactoring
- Code actions
- Diagnostics
INSTALL
brew install metals
nix profile install nixpkgs#metals
CAVEATS
Requires JDK 11+. Initial indexing takes time. Build tool must be supported. Performance depends on project size.
HISTORY
Metals was created by Ólafur Páll Geirsson at the Scala Center in 2018 as the official Scala language server.