Module: Legion::LLM::Tools::Dispatcher

Extended by:
Legion::Logging::Helper
Defined in:
lib/legion/llm/tools/dispatcher.rb

Class Method Summary collapse

Class Method Details

.check_catalog_override(tool_name) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 74

def check_catalog_override(tool_name)
  return nil unless defined?(Legion::Extensions::Catalog::Registry)
  return nil unless Legion::LLM::Tools::Confidence.should_override?(tool_name)

  cap = Legion::Extensions::Catalog::Registry.for_override(tool_name)
  return nil unless cap

  {
    type:     :extension,
    lex:      cap.extension,
    runner:   cap.runner,
    function: cap.function
  }
end

.check_override(tool_name) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 52

def check_override(tool_name)
  settings_override = check_settings_override(tool_name)
  return settings_override if settings_override

  check_catalog_override(tool_name)
end

.check_settings_override(tool_name) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 59

def check_settings_override(tool_name)
  overrides = Legion::LLM::Settings.global_value(:mcp, :overrides)
  return nil unless overrides.is_a?(Hash)

  override = overrides[tool_name]
  return nil unless override

  {
    type:     :extension,
    lex:      override[:lex] || override['lex'],
    runner:   override[:runner] || override['runner'],
    function: override[:function] || override['function']
  }
end

.dispatch(tool_call:, source:, exchange_id: nil) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 14

def dispatch(tool_call:, source:, exchange_id: nil)
  start_time = Time.now

  if source[:type] == :mcp
    override = check_override(tool_call[:name])
    if override
      overridden_source = source
      source = override.merge(overridden_from: overridden_source)
    end
  end

  result = case source[:type]
           when :mcp
             mcp_result = dispatch_mcp(tool_call, source)
             run_shadow(tool_call, source, mcp_result)
             mcp_result
           when :extension
             dispatch_extension(tool_call, source)
           when :registry
             dispatch_registry(tool_call, source)
           when :client
             dispatch_client(tool_call, source)
           when :builtin
             dispatch_builtin(tool_call, source)
           else
             { status: :error, error: "Unknown tool source type: #{source[:type]}" }
           end

  result.merge(
    source:      source,
    exchange_id: exchange_id,
    duration_ms: ((Time.now - start_time) * 1000).to_i
  )
rescue StandardError => e
  handle_exception(e, level: :warn, operation: 'llm.tools.dispatcher.dispatch_tool_call', tool_name: tool_call[:name])
  { status: :error, error: e.message, source: source, exchange_id: exchange_id }
end

.dispatch_builtin(_tool_call, _source) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 128

def dispatch_builtin(_tool_call, _source)
  { status: :passthrough, result: nil }
end

.dispatch_client(tool_call, source) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 118

def dispatch_client(tool_call, source)
  return { status: :error, result: "Tool #{tool_call[:name]} is not executable server-side." } unless source[:executable]

  require 'legion/llm/api/native/helpers'

  helper = Object.new.extend(Legion::LLM::API::Native::ClientToolMethods)
  result = helper.send(:dispatch_client_tool, tool_call[:name].to_s, **symbolize_keys(tool_call[:arguments] || {}))
  { status: :success, result: result }
end

.dispatch_extension(tool_call, source) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 98

def dispatch_extension(tool_call, source)
  segments = (source[:lex] || '').delete_prefix('lex-').split('-')
  runner_path = (%w[Legion Extensions] + segments.map(&:capitalize) + ['Runners', source[:runner]]).join('::')

  runner = Kernel.const_get(runner_path)
  fn = source[:function].to_sym
  result = runner.send(fn, **(tool_call[:arguments] || {}))
  { status: :success, result: result }
end

.dispatch_mcp(tool_call, source) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 89

def dispatch_mcp(tool_call, source)
  conn = ::Legion::MCP::Client::Pool.connection_for(source[:server])
  raise "No connection for MCP server: #{source[:server]}" unless conn

  raw = conn.call_tool(name: tool_call[:name], arguments: tool_call[:arguments] || {})
  content = raw[:content]&.map { |c| c[:text] || c['text'] }&.join("\n")
  { status: raw[:error] ? :error : :success, result: content }
end

.dispatch_registry(tool_call, source) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 108

def dispatch_registry(tool_call, source)
  tool_class = source[:tool_class]
  raise "No registry tool class for #{tool_call[:name]}" unless tool_class.respond_to?(:call)

  args = symbolize_keys(tool_call[:arguments] || {})
  args = Interceptor.intercept(tool_call[:name], **args)
  result = tool_class.call(**args)
  { status: result_error?(result) ? :error : :success, result: extract_content(result) }
end

.extract_content(result) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 146

def extract_content(result)
  if result.respond_to?(:content) && result.content.is_a?(Array)
    result.content.filter_map { |c| c[:text] || c['text'] || c.to_s }.join("\n")
  elsif result.is_a?(Hash) && result[:content].is_a?(Array)
    result[:content].filter_map { |c| c[:text] || c['text'] }.join("\n")
  elsif result.is_a?(Hash)
    Legion::JSON.dump(result)
  elsif result.is_a?(String)
    result
  else
    result.to_s
  end
end

.result_error?(result) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/llm/tools/dispatcher.rb', line 160

def result_error?(result)
  result.is_a?(Hash) && (result[:error] || result['error'])
end

.run_shadow(tool_call, _source, mcp_result) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 164

def run_shadow(tool_call, _source, mcp_result)
  tool_name = tool_call[:name]
  return unless Legion::LLM::Tools::Confidence.should_shadow?(tool_name)
  return unless defined?(Legion::Extensions::Catalog::Registry)

  cap = Legion::Extensions::Catalog::Registry.for_override(tool_name)
  return unless cap

  shadow_source = { type: :extension, lex: cap.extension, runner: cap.runner, function: cap.function }
  shadow_result = dispatch_extension(tool_call, shadow_source)

  if shadow_result[:status] == :success && mcp_result[:status] == :success
    Legion::LLM::Tools::Confidence.record_success(tool_name)
  else
    Legion::LLM::Tools::Confidence.record_failure(tool_name)
  end
rescue StandardError => e
  Legion::LLM::Tools::Confidence.record_failure(tool_name) if tool_name
  handle_exception(e, level: :debug, operation: 'llm.tools.dispatcher.shadow_execution', tool_name: tool_name)
end

.symbolize_keys(value) ⇒ Object 



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# File 'lib/legion/llm/tools/dispatcher.rb', line 132

def symbolize_keys(value)
  case value
  when Hash
    value.to_h do |key, nested|
      normalized_key = key.respond_to?(:to_sym) ? key.to_sym : key
      [normalized_key, symbolize_keys(nested)]
    end
  when Array
    value.map { |entry| symbolize_keys(entry) }
  else
    value
  end
end