MCPLS

The simplest installation path is cargo install. Pre-built binaries for Linux, macOS (Intel and Apple Silicon), and Windows are also available on the GitHub Releases page.

cargo install mcpls

mcpls uses graceful degradation — it skips any language server that is not installed. Install at least one for your primary language.

# Rust
rustup component add rust-analyzer

# Python
npm install -g pyright

# TypeScript / JavaScript
npm install -g typescript-language-server typescript

# Go
go install golang.org/x/tools/gopls@latest

For Claude Desktop, edit ~/Library/Application Support/Claude/claude_desktop_config.json on macOS (or %APPDATA%\Claude\claude_desktop_config.json on Windows). No additional arguments are required for most projects.

{
  "mcpServers": {
    "mcpls": {
      "command": "mcpls",
      "args": []
    }
  }
}

Quit and relaunch Claude Desktop so it connects to mcpls. The server will auto-detect language servers based on project markers (Cargo.toml, pyproject.toml, package.json, go.mod, etc.) when you open a project.

Place a mcpls.toml in ~/.config/mcpls/ to customise workspace roots, language server paths, heuristics, and log level. The MCPLS_LOG environment variable controls verbosity at runtime.

[workspace]
roots = ["/path/to/project"]

[[lsp_servers]]
language_id = "rust"
command = "rust-analyzer"
args = []

[lsp_servers.initialization_options]
cargo.features = "all"
checkOnSave.command = "clippy"