class LittleGhost::ToolRegistry

ToolRegistry turns an agent’s tool declarations into the exact set a model can call during one run. It validates names, binds run collaborators, and closes owned tool instances with the run.

binding = LittleGhost::Tool::Binding.new
registry = LittleGhost::ToolRegistry.new([HelpCenterLookupTool], binding:)
registry.names # => ["policy_lookup"]

Entries may be Tool instances, Tool subclasses, nested arrays, or provider classes that implement tools(binding). Names must be unique, contain only letters, numbers, underscores, or hyphens, and be at most 64 characters. Owned tools that implement close are closed once in reverse order.

Public Class Methods

new (tools = [], binding: Tool::Binding.new)

Source

# File lib/little_ghost/tool_registry.rb, line 23
def initialize(tools = [], binding: Tool::Binding.new)
  @tools = {}
  @binding = binding
  @closed = false
  @closed_tool_ids = {}
  supplied_instances = Array(tools).flatten.grep(Tool).uniq(&:object_id)
  add(tools)
rescue => error
  begin
    close
  rescue
    nil
  end
  begin
    close_instances(supplied_instances)
  rescue
    nil
  end
  raise error
end

Binds newly instantiated tools to binding.

Public Instance Methods

close ()

Source

# File lib/little_ghost/tool_registry.rb, line 80
def close
  return if @closed

  @closed = true
  close_instances(@tools.each_value.to_a)
end

Closes every owned tool that responds to close.

each (&block)

Source

# File lib/little_ghost/tool_registry.rb, line 93
def each(&block)
  @tools.each_value(&block)
end

Yields each registered tool instance.

fetch (name)

Source

# File lib/little_ghost/tool_registry.rb, line 88
def fetch(name)
  @tools.fetch(name.to_s) { raise ToolError, "Unknown tool: #{name}" }
end

Finds the named tool or raises ToolError when it is unavailable.

names ()

Source

# File lib/little_ghost/tool_registry.rb, line 103
def names
  @tools.keys.freeze
end

Lists the frozen model-visible tool names.

Source

# File lib/little_ghost/tool_registry.rb, line 46
def register(tool, replace: false)
  raise Error, "Tool registry is closed" if @closed

  instances = []
  existing_ids = @tools.each_value.to_h { |instance| [instance.object_id, true] }
  resolve(tool, instances, binding: @binding)
  seen = []
  names = instances.map do |instance|
    raise ConfigurationError, "Tools must inherit from LittleGhost::Tool" unless instance.is_a?(Tool)

    name = instance.class.tool_name
    validate_name!(name)
    validate_description!(instance.class.description)
    raise ConfigurationError, "Tool name collision: #{name}" if @tools.key?(name) && !replace
    raise ConfigurationError, "Tool name collision: #{name}" if seen.include?(name)

    seen << name
    name
  end

  replaced = names.filter_map { |name| @tools[name] if replace }
  names.zip(instances).each { |name, instance| @tools[name] = instance }
  close_instances(replaced)
  self
rescue => error
  begin
    close_instances(instances.to_a.reject { |instance| existing_ids&.key?(instance.object_id) })
  rescue
    nil
  end
  raise error
end

Registers tool and returns self. When replace is true, replaced owned tools are closed after the new entries have been validated.

specifications ()

Source

# File lib/little_ghost/tool_registry.rb, line 98
def specifications
  map { |tool| tool.class.specification }.freeze
end

Collects the frozen model-facing tool specifications.