Zed currently doesn't install Solargraph automatically. To use Solargraph, you need to install the gem. Zed just looks for an executable called solargraph on your PATH.

You can install the gem manually with the following command:

gem install solargraph

Alternatively, if your project uses Bundler, you can add the Solargraph gem to your Gemfile:

gem 'solargraph', group: :development

Solargraph has formatting and diagnostics disabled by default. We can tell Zed to enable them by adding the following to your settings.json:

   "lsp": {
      "solargraph": {
         "initialization_options": {
            "diagnostics": true,
            "formatting": true


Solargraph reads its configuration from a file called .solargraph.yml in the root of your project. For more information about this file, see the Solargraph configuration documentation.