Add Ruby LSP plugin with inline lspServers configuration

[obahareth]

Summary

Add the Ruby LSP plugin to the official marketplace following the existing conventions set out in a previous PR for pre-existing LSP plugins. This enables the LSP plugin recommendation feature in Claude Code to detect the Ruby LSP plugin alongside existing LSP plugins directly from the marketplace.

LSP plugin added

Plugin	Language	Extensions	Binary
ruby-lsp	Ruby	.rb, .rake, .gemspec, .ru, .erb	ruby-lsp

Implementation

Following the existing conventions set out in a previous PR for pre-existing LSP plugins:

• The plugin uses strict: false since it only provides LSP configuration

Test plan

• claude plugin validate . passes
• Plugin installs successfully via claude plugin install ruby-lsp@marketplace
• Verify LSP activates for Ruby files when ruby-lsp binary is installed (blocked by #13952)

Note: LSP server activation is currently blocked by a known race condition issue (#13952) affecting LSP plugins. The plugin configuration follows the exact same pattern as other working LSP plugins and should function once the issue is resolved.

Example Usage

This is quite a verbose example, but I used this to test on 2.0.67 which isn't affected by the race condition and it works.

ENABLE_LSP_TOOL=true timeout 45 bun x @anthropic-ai/claude-code@2.0.67 --plugin-dir . --dangerously-skip-permissions --verbose -p "Using LSP, list all symbols in /tmp/test_ruby.rb" 2>&1 | grep -A20 "LSP\|symbols\|Hello\|greet" | head -40
The file `/tmp/test_ruby.rb` contains the following symbols:

| Symbol | Kind | Line |
|--------|------|------|
| `Hello` | Class | 1 |
| `greet` | Method | 2 |
| `farewell` | Method | 6 |

The structure shows a `Hello` class with two methods: `greet` and `farewell`.

This is the test file I used

class Hello
  def greet
    puts "Hello, World!"
  end

  def farewell
    puts "Goodbye!"
  end
end

Installation

Users need to install the ruby-lsp binary separately:

gem install ruby-lsp

More Information

• Ruby LSP Website
• GitHub Repository

[yasaichi]

I am wondering what is preventing this PR from being merged, given that the issue anthropics/claude-code#13952 has been fixed in v2.1.0.

Fixed race condition where LSP tool could return "no server available" during startup

[jonesdeini]

I would love to see this get merged!