eliminate code duplication

Identify and consolidate duplicate code patterns by extracting common logic into reusable functions and unifying similar code blocks. This improves maintainability, reduces bugs, and enhances readability.

Key strategies:

• Unify similar conditional blocks: Instead of having separate if/else branches with identical content, create a single path that handles both cases
• Extract common logic: Move repeated code into helper functions with descriptive names
• Eliminate redundant checks: Remove unnecessary repeated validations or state checks within the same method
• Simplify complex expressions: Break down complex inline constructions into separate, reusable components

Example from the codebase:

# Before: Duplicate code paths
if self.node_timeout is not None:
    events = self._stream_with_timeout(...)
else:
    events = self.stream_async(...)

# After: Unified approach
events = self._stream_with_timeout(...) if self.node_timeout else self.stream_async(...)

Another example:

# Before: Complex inline construction
after_event = agent.hooks.invoke_callbacks(
    AfterToolCallEvent(
        agent=agent,
        tool_use=tool_use,
        result={
            "toolUseId": tool_use["toolUseId"],
            "status": "cancelled",
            "content": [{"text": "Tool execution was cancelled"}]
        }
    )
)

# After: Extract result construction
cancelled_result = self._create_cancelled_tool_result(tool_use)
after_event = agent.hooks.invoke_callbacks(
    AfterToolCallEvent(agent=agent, tool_use=tool_use, result=cancelled_result)
)

Always look for opportunities to consolidate when you notice similar patterns, repeated logic, or multiple code paths that achieve the same outcome.