feat: scenario tools [CW-4597] (#11908)

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

enterprise/app/models/captain/scenario.rb

@@ -21,6 +21,8 @@
 #  index_captain_scenarios_on_enabled                   (enabled)
 #
 class Captain::Scenario < ApplicationRecord
+  include Concerns::CaptainToolsHelpers
+
   self.table_name = 'captain_scenarios'
 
   belongs_to :assistant, class_name: 'Captain::Assistant'
@@ -31,14 +33,60 @@ class Captain::Scenario < ApplicationRecord
   validates :instruction, presence: true
   validates :assistant_id, presence: true
   validates :account_id, presence: true
+  validate :validate_instruction_tools
 
   scope :enabled, -> { where(enabled: true) }
 
-  before_save :populate_tools
+  before_save :resolve_tool_references
 
   private
 
-  def populate_tools
-    # TODO: Implement tools population logic
+  # Validates that all tool references in the instruction are valid.
+  # Parses the instruction for tool references and checks if they exist
+  # in the available tools configuration.
+  #
+  # @return [void]
+  # @api private
+  # @example Valid instruction
+  #   scenario.instruction = "Use [Add Contact Note](tool://add_contact_note) to document"
+  #   scenario.valid? # => true
+  #
+  # @example Invalid instruction
+  #   scenario.instruction = "Use [Invalid Tool](tool://invalid_tool) to process"
+  #   scenario.valid? # => false
+  #   scenario.errors[:instruction] # => ["contains invalid tools: invalid_tool"]
+  def validate_instruction_tools
+    return if instruction.blank?
+
+    tool_ids = extract_tool_ids_from_text(instruction)
+    return if tool_ids.empty?
+
+    available_tool_ids = self.class.available_tool_ids
+    invalid_tools = tool_ids - available_tool_ids
+
+    return unless invalid_tools.any?
+
+    errors.add(:instruction, "contains invalid tools: #{invalid_tools.join(', ')}")
+  end
+
+  # Resolves tool references from the instruction text into the tools field.
+  # Parses the instruction for tool references and materializes them as
+  # tool IDs stored in the tools JSONB field.
+  #
+  # @return [void]
+  # @api private
+  # @example
+  #   scenario.instruction = "First [@Add Private Note](tool://add_private_note) then [@Update Priority](tool://update_priority)"
+  #   scenario.save!
+  #   scenario.tools # => ["add_private_note", "update_priority"]
+  #
+  #   scenario.instruction = "No tools mentioned here"
+  #   scenario.save!
+  #   scenario.tools # => nil
+  def resolve_tool_references
+    return if instruction.blank?
+
+    tool_ids = extract_tool_ids_from_text(instruction)
+    self.tools = tool_ids.presence
   end
 end