HLS Plugin for Claude Code

This plugin integrates the Haskell Language Server (HLS) with Claude Code, enabling full LSP support for Haskell development including diagnostics, go-to-definition, find references, hover information, completions, and code actions for .hs and .lhs files. It includes a /hls:status command for quick health checks and a troubleshooting skill that guides you through diagnosing HLS issues when things aren't working. The plugin requires HLS (haskell-language-server-wrapper) to be installed and available in your PATH, along with an existing Cabal or Stack project—it handles project detection automatically.

Prerequisites

• Haskell Language Server installed and available in your PATH
• A Cabal or Stack project

Installation

1. Add the marketplace:

   /plugin marketplace add m4dc4p/claude-hls
   

2. Install the plugin:

   /plugin install hls@claude-hls
   

Usage

• Check HLS status: Run /hls:status to verify HLS is installed and working
• Troubleshooting: If you encounter issues, ask Claude "HLS is not working, can you help?" to trigger the troubleshooting skill
• LSP features: Once working, Claude will automatically use HLS for diagnostics, completions, go-to-definition, and more when working with .hs or .lhs files