Class: Ask::Agent::Chat

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

Overview

Thin wrapper around Provider + an internal message array that presents a Chat-like API for ask-agent internal use.

Manages conversation history, resolves the correct provider/model, handles streaming chunk accumulation, and normalises tool call formats between Ask::Provider (Array of Hashes) and ask-agent internal usage (Hash of { id => ToolCallInfo }).

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model:, tools: [], temperature: nil, schema: nil, provider: nil) ⇒ Chat

Returns a new instance of Chat.

Parameters:

  • model (String, #ask) —

    model ID or chat-like object

  • tools (Array<Ask::Tool>) (defaults to: []) —

    tool instances available to the chat

  • temperature (Float, nil) (defaults to: nil) —

    sampling temperature

  • schema (Ask::Schema, Hash, nil) (defaults to: nil) —

    structured output schema

  • provider (String, Symbol, nil) (defaults to: nil) —

    provider slug (overrides catalog lookup)



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# File 'lib/ask/agent/chat.rb', line 42

def initialize(model:, tools: [], temperature: nil, schema: nil, provider: nil, **)
  @model_id = model.respond_to?(:id) ? model.id : model.to_s
  @model_info = Ask::ModelCatalog.find(@model_id)
  @tools = tools
  @temperature = temperature
  @schema = schema
  @messages = []
  @provider_override = provider
  @provider = nil
end

Instance Attribute Details

#messages ⇒ Array<Ask::Message> (readonly)

Returns all messages in the conversation.

Returns:

  • (Array<Ask::Message>) —

    all messages in the conversation



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# File 'lib/ask/agent/chat.rb', line 35

def messages
  @messages
end

#model_id ⇒ String (readonly)

Returns model ID (e.g. "gpt-4o").

Returns:

  • (String) —

    model ID (e.g. "gpt-4o")



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# File 'lib/ask/agent/chat.rb', line 29

def model_id
  @model_id
end

Instance Method Details

#add_message(role:, content: nil, tool_call_id: nil, tool_calls: nil) ⇒ Object

Add a message to the conversation history.

Parameters:

  • role (Symbol) —

    :system, :user, :assistant, :tool

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

    message content

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

    tool call ID (for tool results)

  • tool_calls (Array<Hash>, nil) (defaults to: nil) —

    tool call invocations



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# File 'lib/ask/agent/chat.rb', line 112

def add_message(role:, content: nil, tool_call_id: nil, tool_calls: nil)
  @messages << Ask::Message.new(
    role: role,
    content: content,
    tool_call_id: tool_call_id,
    tool_calls: tool_calls
  )
end

#ask(message = nil) {|ChatChunk| ... } ⇒ ResponseMessage

Send a user message and get a completion response.

Parameters:

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

    user message text

Yields:

  • (ChatChunk) —

    streaming chunks (only when a block is given)

Returns:



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# File 'lib/ask/agent/chat.rb', line 58

def ask(message = nil, &block)
  @messages << Ask::Message.new(role: :user, content: message.to_s) if message

  stream = block_given?
  tool_defs = @tools.map { |t| Ask::ToolDef.from_tool(t) }

  # Accumulator for tool calls during streaming (keyed by index)
  calls_acc = {}

  result = provider.chat(          @messages.map(&:to_h),
    model: @model_id,
    tools: tool_defs,
    temperature: @temperature,
    stream: stream,
    schema: @schema&.respond_to?(:to_json_schema) ? @schema.to_json_schema : @schema,
    **(@extra_params || {})
  ) do |raw_chunk|
    next unless block_given?

    # Accumulate tool calls by index during streaming
    accumulate_tool_calls(raw_chunk, calls_acc)

    # Yield adapted chunk with current tool call state
    yield ChatChunk.new(
      content: raw_chunk.content,
      tool_calls: build_current_tool_calls(calls_acc),
      thinking: raw_chunk.respond_to?(:thinking) ? raw_chunk.thinking : nil
    )
  end

  response_msg = if stream
    build_stream_response(result, calls_acc)
  else
    build_response(result)
  end

  # Store assistant response in conversation history
  @messages << Ask::Message.new(
    role: :assistant,
    content: response_msg.content,
    tool_calls: response_msg.tool_calls&.values&.map { |tc|
      { id: tc.id, type: "function", name: tc.name, arguments: tc.arguments }
    }
  )

  response_msg
end

#model ⇒ String

Returns model ID (e.g. "gpt-4o").

Returns:

  • (String) —

    model ID (e.g. "gpt-4o")



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# File 'lib/ask/agent/chat.rb', line 31

def model
  @model_id
end

#reset_messages! ⇒ Object

Clear all messages from the conversation.



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# File 'lib/ask/agent/chat.rb', line 153

def reset_messages!
  @messages.clear
end

#with_instructions(prompt) ⇒ self

Set or replace the system prompt.

Parameters:

  • prompt (String) —

    system instructions

Returns:

  • (self) 


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# File 'lib/ask/agent/chat.rb', line 125

def with_instructions(prompt)
  @messages.reject! { |m| m.role == :system }
  @messages.unshift(Ask::Message.new(role: :system, content: prompt))
  self
end

#with_params(**params) ⇒ self

Set additional parameters for the provider call and return self.

Parameters:

  • params (Hash) —

    extra parameters passed to the provider

Returns:

  • (self) 


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# File 'lib/ask/agent/chat.rb', line 139

def with_params(**params)
  @extra_params = (@extra_params || {}).merge(params)
  self
end

#with_schema(schema) ⇒ self

Parameters:

  • params (Hash) —

    extra keyword arguments for the provider

Returns:

  • (self) 


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# File 'lib/ask/agent/chat.rb', line 147

def with_schema(schema)
  @schema = schema.respond_to?(:to_json_schema) ? schema.to_json_schema : schema
  self
end