Class: Ollama::Agent::Executor

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

Overview

Stateful executor-style agent using /api/chat + tool-calling loop.

The LLM never executes tools. It can only request tool calls; this class executes Ruby callables and feeds results back as role: "tool" messages.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(client, tools:, max_steps: 20, stream: nil) ⇒ Executor

Returns a new instance of Executor.



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# File 'lib/ollama/agent/executor.rb', line 15

def initialize(client, tools:, max_steps: 20, stream: nil)
  @client = client
  @tools = tools || {}
  @max_steps = max_steps
  @stream = stream
  @messages = []
end

Instance Attribute Details

#messages ⇒ Object (readonly)

Returns the value of attribute messages.



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# File 'lib/ollama/agent/executor.rb', line 13

def messages
  @messages
end

Instance Method Details

#run(system:, user:) ⇒ Object

rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/MethodLength, Metrics/PerceivedComplexity



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# File 'lib/ollama/agent/executor.rb', line 24

def run(system:, user:)
  @messages = [
    Messages.system(system),
    Messages.user(user)
  ]

  last_assistant_content = nil

  @max_steps.times do
    @stream&.emit(:state, state: :assistant_streaming)

    response = request_chat

    message = response.message
    content = message&.content
    tool_calls = message&.tool_calls || []

    # Preserve the assistant turn in history (including tool_calls if present).
    @messages << Messages.assistant(content.to_s, tool_calls: tool_calls.map(&:to_h)) if content || !tool_calls.empty?
    last_assistant_content = content if content && !content.empty?

    break if tool_calls.empty?

    tool_calls.each do |call|
      name = call.name
      raise Ollama::Error, "Tool call missing function name: #{call.inspect}" if name.nil? || name.empty?

      args_hash = call.arguments.is_a?(Hash) ? call.arguments : {}

      tool_entry = @tools[name] || @tools[name.to_sym]
      raise Ollama::Error, "Tool '#{name}' not found. Available: #{@tools.keys.sort.join(", ")}" unless tool_entry

      # Extract callable from tool entry
      callable = extract_callable(tool_entry)
      raise Ollama::Error, "Tool '#{name}' has no associated callable" unless callable

      @stream&.emit(:state, state: :tool_executing)
      result = invoke_tool(callable, args_hash)
      tool_content = encode_tool_result(result)

      tool_call_id = call.id
      @messages << Messages.tool(content: tool_content, name: name, tool_call_id: tool_call_id)
      @stream&.emit(:state, state: :tool_result_injected)
    end
  end

  if last_assistant_content.nil?
    raise Ollama::Error,
          "Executor exceeded max_steps=#{@max_steps} (possible infinite tool loop)"
  end

  @stream&.emit(:final, text: last_assistant_content.to_s)
  last_assistant_content
end