Feature: Interactive Session Input Handling and Error Recovery
  As a developer
  I want interactive sessions to handle help, exit, empty input, interrupts, EOF, and stream/graph commands correctly
  So that the CLI session remains responsive and recovers from user input errors

  Background:
    Given a fresh interactive coverage test context (aic)

  Scenario: start_interactive_session enters while loop and processes exit
    Given an app with config and pure_graph for interactive testing (aic)
    When I call start_interactive_session with input "exit" (aic)
    Then the session should print goodbye and complete without error (aic)

  Scenario: start_interactive_session processes help command
    Given an app with config and pure_graph for interactive testing (aic)
    When I call start_interactive_session with input "help, exit" (aic)
    Then the help message should be printed during the session (aic)

  Scenario: start_interactive_session processes empty input
    Given an app with config and pure_graph for interactive testing (aic)
    When I call start_interactive_session with input " , exit" (aic)
    Then empty input should be skipped in the session (aic)

  Scenario: start_interactive_session handles EOFError
    Given an app with config and pure_graph for interactive testing (aic)
    When I call start_interactive_session with EOFError input (aic)
    Then the session should print goodbye and complete (aic)

  Scenario: start_interactive_session handles KeyboardInterrupt
    Given an app with config and pure_graph for interactive testing (aic)
    When I call start_interactive_session with KeyboardInterrupt then exit input (aic)
    Then the keyboard interrupt help message should be printed (aic)

  Scenario: run_single_shot with stream path triggers on_error callback
    Given an app with config and stream_router set up (aic)
    When I call run_single_shot that triggers on_error via stream message (aic)
    Then the on_error should log the stream error (aic)

  Scenario: start_interactive_session saves user and assistant messages to context_manager
    Given an app with config, pure_graph, and context_manager for interactive (aic)
    When I call start_interactive_session with context_manager and input "hello,exit" (aic)
    Then user and assistant messages should be saved to context_manager (aic)

  Scenario: run_single_shot processes context_updates from tools
    Given an app with config and stream_router set up (aic)
    When I call run_single_shot that handles context_updates from tools (aic)
    Then global_context from tools should be updated via _CONTEXT_UPDATES (aic)

  Scenario: _handle_graph_command with invalid graph route lists available graphs
    Given an app with config and graph routes for interactive commands (aic)
    When I call _handle_graph_command for a missing route "nonexistent" (aic)
    Then available graph routes should be printed (aic)

  Scenario: _handle_stream_command with config=None handles safely
    Given an app without config but with streams for interactive (aic)
    When I call _handle_stream_command with "valid_stream test" (aic)
    Then the message should be delivered to the stream (aic)