Feature: LangGraph nodes uncovered lines
  As a developer
  I want to cover remaining uncovered branches in langgraph nodes
  So that code coverage improves for nodes.py

  Scenario: Tool node marks execution
    Given a tool node configured
    When I execute the tool node
    Then it should mark tool executed

  Scenario: ToolAgent branch uses current_message for input
    Given a tool agent node using ToolAgent with current_message "override"
    When I execute the tool agent node with ToolAgent branch
    Then the ToolAgent should receive input "override"

  Scenario: Agent falls back to last assistant message when no user entries exist
    Given an agent node with only assistant history
    When I execute the agent node for assistant fallback
    Then the agent should receive the assistant fallback content

  Scenario: Agent clearing context skips metadata merge
    Given an agent that clears context during processing
    When I execute the clearing agent node
    Then only last_agent_node metadata should remain

  Scenario: Agent mutation adds metadata updates
    Given an agent that mutates context to add metadata
    When I execute the mutating agent node
    Then the metadata should include the mutated key

  Scenario: Subgraph node reports invocation
    Given a subgraph node named "child_subgraph"
    When I execute the subgraph node
    Then it should report the invoked subgraph "child_subgraph"

  Scenario: Start node indicates start
    Given a start node
    When I execute the start node
    Then it should indicate graph start

  Scenario: End node indicates completion
    Given an end node
    When I execute the end node
    Then it should indicate graph completion

  Scenario: Non-dict tool result leaves base state updates
    Given a tool node patched to return non dict
    When I execute the patched tool node
    Then the execute result should only include current_node