feat(captain): add rubyllm provider config

config/installation_config.yml

@@ -195,6 +195,24 @@
   display_title: 'OpenAI API Endpoint (optional)'
   description: 'The OpenAI endpoint configured for use in Captain AI. Default: https://api.openai.com/'
   locked: false
+- name: CAPTAIN_ANTHROPIC_API_KEY
+  display_title: 'Anthropic API Key'
+  description: 'The API key used to authenticate requests to Anthropic models for Captain AI.'
+  locked: false
+  type: secret
+- name: CAPTAIN_ANTHROPIC_API_BASE
+  display_title: 'Anthropic API Base (optional)'
+  description: 'The Anthropic endpoint configured for use in Captain AI. Defaults to RubyLLM provider settings.'
+  locked: false
+- name: CAPTAIN_GEMINI_API_KEY
+  display_title: 'Gemini API Key'
+  description: 'The API key used to authenticate requests to Gemini models for Captain AI.'
+  locked: false
+  type: secret
+- name: CAPTAIN_GEMINI_API_BASE
+  display_title: 'Gemini API Base (optional)'
+  description: 'The Gemini endpoint configured for use in Captain AI. Defaults to RubyLLM provider settings.'
+  locked: false
 - name: CAPTAIN_EMBEDDING_MODEL
   display_title: 'Embedding Model (optional)'
   description: 'The embedding model configured for use in Captain AI. Default: text-embedding-3-small'

lib/llm/config.rb

@@ -2,11 +2,25 @@ require 'ruby_llm'
 
 module Llm::Config
   DEFAULT_MODEL = 'gpt-4.1-mini'.freeze
+  DEFAULT_PROVIDER = 'openai'.freeze
+
+  PROVIDER_CONFIGS = {
+    'openai' => {
+      api_key: 'CAPTAIN_OPEN_AI_API_KEY',
+      api_base: 'CAPTAIN_OPEN_AI_ENDPOINT'
+    },
+    'anthropic' => {
+      api_key: 'CAPTAIN_ANTHROPIC_API_KEY',
+      api_base: 'CAPTAIN_ANTHROPIC_API_BASE'
+    },
+    'gemini' => {
+      api_key: 'CAPTAIN_GEMINI_API_KEY',
+      api_base: 'CAPTAIN_GEMINI_API_BASE'
+    }
+  }.freeze
 
   class << self
-    def initialized?
+    def initialized? = @initialized ||= false
-      @initialized ||= false
-    end
 
     def initialize!
       return if @initialized
@@ -15,37 +29,101 @@ module Llm::Config
       @initialized = true
     end
 
-    def reset!
+    def reset! = @initialized = false
-      @initialized = false
-    end
 
-    def with_api_key(api_key, api_base: nil)
+    def with_api_key(api_key, provider: DEFAULT_PROVIDER, api_base: nil)
       initialize!
       context = RubyLLM.context do |config|
-        config.openai_api_key = api_key
+        configure_provider(config, provider: provider, api_key: api_key, api_base: api_base)
-        config.openai_api_base = api_base
       end
 
       yield context
     end
 
+    def ruby_llm_provider_supported?(provider)
+      RubyLLM::Provider.providers.key?(provider.to_s.to_sym)
+    end
+
+    def provider_options
+      PROVIDER_CONFIGS.keys.each_with_object({}) do |provider, result|
+        next unless ruby_llm_provider_supported?(provider)
+
+        result[provider] = ruby_llm_provider_name(provider)
+      end
+    end
+
+    def api_key_for(provider)
+      installation_config_value(provider, :api_key)
+    end
+
+    def api_base_for(provider)
+      api_base = installation_config_value(provider, :api_base).presence
+      return if api_base.blank?
+
+      normalized_api_base(provider, api_base)
+    end
+
+    def provider_configured?(provider)
+      api_key_for(provider).present?
+    end
+
+    def openai_provider?(provider)
+      provider.to_s == DEFAULT_PROVIDER
+    end
+
+    def supports_tools_and_schema?(provider)
+      openai_provider?(provider)
+    end
+
+    def configure_provider(config, provider:, api_key:, api_base: nil)
+      provider = provider.to_s
+      options = provider_configuration_options(provider)
+      api_key_option = :"#{provider}_api_key"
+      api_base_option = :"#{provider}_api_base"
+
+      set_config_value(config, api_key_option, api_key) if api_key.present? && options.include?(api_key_option)
+      set_config_value(config, api_base_option, api_base) if api_base.present? && options.include?(api_base_option)
+    end
+
     private
 
     def configure_ruby_llm
       RubyLLM.configure do |config|
-        config.openai_api_key = system_api_key if system_api_key.present?
+        PROVIDER_CONFIGS.each_key do |provider|
-        config.openai_api_base = openai_endpoint.chomp('/') if openai_endpoint.present?
+          next unless ruby_llm_provider_supported?(provider)
+
+          configure_provider(config, provider: provider, api_key: api_key_for(provider), api_base: api_base_for(provider))
+        end
         config.model_registry_file = Rails.root.join('config/llm_models.json').to_s
         config.logger = Rails.logger
       end
     end
 
-    def system_api_key
+    def ruby_llm_provider_name(provider)
-      InstallationConfig.find_by(name: 'CAPTAIN_OPEN_AI_API_KEY')&.value
+      RubyLLM::Provider.providers[provider.to_s.to_sym].name
     end
 
-    def openai_endpoint
+    def provider_configuration_options(provider)
-      InstallationConfig.find_by(name: 'CAPTAIN_OPEN_AI_ENDPOINT')&.value
+      RubyLLM::Provider.providers[provider.to_s.to_sym]&.configuration_options || []
+    end
+
+    def set_config_value(config, option, value)
+      setter = :"#{option}="
+      config.public_send(setter, value) if config.respond_to?(setter)
+    end
+
+    def installation_config_value(provider, key)
+      config_name = PROVIDER_CONFIGS.dig(provider.to_s, key)
+      return if config_name.blank?
+
+      InstallationConfig.find_by(name: config_name)&.value
+    end
+
+    def normalized_api_base(provider, api_base)
+      endpoint = api_base.chomp('/').delete_suffix('/chat/completions')
+      return "#{endpoint}/v1" if openai_provider?(provider) && endpoint.exclude?('/v1')
+
+      endpoint
     end
   end
 end

lib/llm/models.rb

@@ -12,11 +12,14 @@ module Llm::Models
     end
 
     def default_model_for(feature)
-      features.dig(feature.to_s, 'default')
+      default_model = features.dig(feature.to_s, 'default')
+      return default_model if supported_model?(default_model)
+
+      models_for(feature).first
     end
 
     def models_for(feature)
-      features.dig(feature.to_s, 'models') || []
+      (features.dig(feature.to_s, 'models') || []).select { |model_name| supported_model?(model_name) }
     end
 
     def valid_model_for?(feature, model_name)
@@ -31,6 +34,17 @@ module Llm::Models
       model_config(model_name)&.dig('provider')
     end
 
+    def supported_provider?(provider)
+      providers.key?(provider.to_s) && Llm::Config.ruby_llm_provider_supported?(provider)
+    end
+
+    def supported_model?(model_name)
+      config = model_config(model_name)
+      return false unless config
+
+      supported_provider?(config['provider'])
+    end
+
     def feature_config(feature_key)
       feature = features[feature_key.to_s]
       return nil unless feature

spec/lib/llm/config_spec.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Llm::Config do
+  describe '.provider_options' do
+    it 'returns configured providers supported by RubyLLM' do
+      expect(described_class.provider_options).to include(
+        'openai' => 'OpenAI',
+        'anthropic' => 'Anthropic',
+        'gemini' => 'Gemini'
+      )
+    end
+  end
+
+  describe '.api_base_for' do
+    it 'normalizes OpenAI-compatible endpoints to the v1 base' do
+      create(:installation_config, name: 'CAPTAIN_OPEN_AI_ENDPOINT', value: 'https://proxy.example.com/chat/completions')
+
+      expect(described_class.api_base_for('openai')).to eq('https://proxy.example.com/v1')
+    end
+
+    it 'keeps non-OpenAI provider endpoints unchanged except trailing slashes' do
+      create(:installation_config, name: 'CAPTAIN_ANTHROPIC_API_BASE', value: 'https://anthropic.example.com/')
+
+      expect(described_class.api_base_for('anthropic')).to eq('https://anthropic.example.com')
+    end
+  end
+
+  describe '.supports_tools_and_schema?' do
+    it 'allows tool and schema configuration only for OpenAI' do
+      expect(described_class.supports_tools_and_schema?('openai')).to be true
+      expect(described_class.supports_tools_and_schema?('anthropic')).to be false
+    end
+  end
+end

spec/lib/llm/models_spec.rb

@@ -40,6 +40,16 @@ RSpec.describe Llm::Models do
     end
   end
 
+  describe '.models_for' do
+    it 'filters out models whose provider is not supported by RubyLLM' do
+      allow(Llm::Config).to receive(:ruby_llm_provider_supported?) do |provider|
+        provider.to_s != 'anthropic'
+      end
+
+      expect(described_class.models_for('assistant')).not_to include('claude-haiku-4.5')
+    end
+  end
+
   describe '.feature_config' do
     it 'returns model metadata for a feature' do
       config = described_class.feature_config('editor')