Class: Kward::Agent

Inherits:
Object
  • Object
show all
Defined in:
lib/kward/agent.rb

Overview

Runs model turns, handles context compaction, dispatches tool calls, and streams high-level events back to CLI and RPC callers.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(client:, tool_registry: ToolRegistry.new, conversation: Conversation.new, telemetry_logger: TelemetryLogger.new) ⇒ Agent

Returns a new instance of Agent.



15
16
17
18
19
20
 
# File 'lib/kward/agent.rb', line 15

def initialize(client:, tool_registry: ToolRegistry.new, conversation: Conversation.new, telemetry_logger: TelemetryLogger.new)
  @client = client
  @tool_registry = tool_registry
  @conversation = conversation
  @telemetry_logger = telemetry_logger
end

Instance Attribute Details

#conversation ⇒ Object (readonly)

Returns the value of attribute conversation.



22
23
24
 
# File 'lib/kward/agent.rb', line 22

def conversation
  @conversation
end

Instance Method Details

#ask(input, display_input: nil, on_reasoning_delta: nil, on_retry: nil, cancellation: nil, steering: nil) {|event| ... } ⇒ String

Adds a user message, compacts context when needed, and runs the turn.

Parameters:

  • input (String) —

    text sent to the model

  • display_input (String, nil) (defaults to: nil) —

    alternate text kept for transcripts

Yield Parameters:

  • event (Object) —

    streamed turn event for frontends

Returns:

  • (String) —

    final assistant answer



30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
 
# File 'lib/kward/agent.rb', line 30

def ask(input, display_input: nil, on_reasoning_delta: nil, on_retry: nil, cancellation: nil, steering: nil, &block)
  started_at = @telemetry_logger.monotonic_now
  status = "completed"
  error = nil
  cancellation&.raise_if_cancelled!
  @conversation.refresh_system_message_if_workspace_agents_changed!
  @conversation.append_user(input, display_content: display_input)
  auto_compact_if_needed
  run_turn(on_reasoning_delta: on_reasoning_delta, on_retry: on_retry, cancellation: cancellation, steering: steering, &block)
rescue StandardError => e
  status = "failed"
  error = e
  raise e
ensure
  log_turn(duration_ms: @telemetry_logger.duration_ms(started_at), status: status, error: error)
end

#run_turn(on_reasoning_delta: nil, on_retry: nil, cancellation: nil, steering: nil) {|event| ... } ⇒ String

Runs model calls until the assistant returns an answer without pending tool calls, including tool dispatch and one context-overflow retry.

Yield Parameters:

  • event (Object) —

    streamed turn event for frontends

Returns:

  • (String) —

    final assistant answer



52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
 
# File 'lib/kward/agent.rb', line 52

def run_turn(on_reasoning_delta: nil, on_retry: nil, cancellation: nil, steering: nil)
  overflow_retried = false
  steering_state = build_steering_state(steering) do |event|
    yield event if block_given?
  end
  loop do
    cancellation&.raise_if_cancelled!
    begin
      message = chat(on_reasoning_delta: on_reasoning_delta, on_retry: on_retry, cancellation: cancellation, steering: steering) do |event|
        yield event if block_given?
      end
    rescue StandardError => e
      raise if cancellation&.cancelled?
      raise unless !overflow_retried && ContextOverflow.error?(e) && compact_after_context_overflow(e)

      overflow_retried = true
      next
    end
    yield Events::AssistantMessage.new(message: message) if block_given?
    @conversation.append_assistant(message)
    steered_after_message = append_steering_events(steering_state)
    yield Events::SteeringApplied.new(count: steered_after_message) if block_given? && steered_after_message.positive?

    tool_calls = message["tool_calls"] || message[:tool_calls] || []
    if tool_calls.empty?
      next if steered_after_message.positive?

      answer = safe_answer(message.fetch("content", message[:content] || ""))
      yield Events::Answer.new(content: answer) if block_given?
      return answer
    end

    tool_calls.each do |tool_call|
      cancellation&.raise_if_cancelled!
      yield Events::ToolCall.new(tool_call: tool_call) if block_given?
      tool_started_at = @telemetry_logger.monotonic_now
      content = nil
      status = "completed"
      error = nil
      begin
        content = @tool_registry.dispatch(tool_call, @conversation, cancellation: cancellation)
      rescue StandardError => e
        status = "failed"
        error = e
        raise e
      ensure
        log_tool(tool_call, content: content, duration_ms: @telemetry_logger.duration_ms(tool_started_at), status: status, error: error)
      end
      cancellation&.raise_if_cancelled!
      yield Events::ToolResult.new(tool_call: tool_call, content: content) if block_given?
    end
    steered_after_tools = append_steering_events(steering_state)
    yield Events::SteeringApplied.new(count: steered_after_tools) if block_given? && steered_after_tools.positive?
  end
ensure
  steering_state&.fetch(:unsubscribe)&.call
end