Module: Ask::Instrumentation::Tool

Defined in:
lib/ask/instrumentation/tool.rb

Constant Summary collapse

TRACE_LOG_DIR = 
File.expand_path("log/tools", Dir.pwd)

Class Method Summary collapse

Class Method Details

.instrument(name:, arguments:, tool_call_id:, metadata: {}, &block) ⇒ Object 



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# File 'lib/ask/instrumentation/tool.rb', line 12

def instrument(name:, arguments:, tool_call_id:, metadata: {}, &block)
  arg_size = arguments.to_s.length
  payload = {
    name: name,
    arguments: arguments,
    argument_size: arg_size,
    tool_call_id: tool_call_id
  }.merge(metadata)

  Ask::Instrumentation.instrument("tool_call.ask", payload)

  start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  begin
    result = block.call
    duration_ms = ((Process.clock_gettime(Process::CLOCK_MONOTONIC) - start_time) * 1000).round(1)
    result_size = result.to_s.length

    result_payload = {
      name: name,
      duration_ms: duration_ms,
      result_size: result_size,
      success: true,
      tool_call_id: tool_call_id
    }.merge(metadata)

    Ask::Instrumentation.instrument("tool_result.ask", result_payload)
    write_trace_log(name: name, duration_ms: duration_ms, success: true,
                   argument_size: arg_size, result_size: result_size,
                   tool_call_id: tool_call_id)
    result
  rescue => e
    duration_ms = ((Process.clock_gettime(Process::CLOCK_MONOTONIC) - start_time) * 1000).round(1)

    error_payload = {
      name: name,
      duration_ms: duration_ms,
      error: e.class.name,
      error_message: e.message,
      success: false,
      tool_call_id: tool_call_id
    }.merge(metadata)

    Ask::Instrumentation.instrument("tool_result.ask", error_payload)
    write_trace_log(name: name, duration_ms: duration_ms, success: false,
                   error: "#{e.class.name}: #{e.message}",
                   tool_call_id: tool_call_id)
    raise
  end
end

.write_trace_log(**payload) ⇒ Object 



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# File 'lib/ask/instrumentation/tool.rb', line 62

def write_trace_log(**payload)
  entry = payload.merge(timestamp: Time.now.utc.iso8601(3))
  dir = TRACE_LOG_DIR
  FileUtils.mkdir_p(dir)
  File.open(File.join(dir, "trace.jsonl"), "a") do |f|
    f.puts(JSON.generate(entry))
  end
rescue => e
  $stderr.puts "[ask-instrumentation] Failed to write trace log: #{e.message}"
end