fix: preserve structured output in graph node transitions #1463
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Fixes strands-agents#1461 Problem: When graph nodes return both text and structured_output, only the text was being propagated to the next node. This was because graph.py called str() on AgentResult, and AgentResult.__str__() only returns structured_output when there is NO text content. Solution: 1. Added AgentResult.to_graph_input_text() method that returns both text AND structured_output (when present), clearly labeled 2. Updated graph.py to call to_graph_input_text() instead of str() 3. Preserved __str__() behavior for backward compatibility This ensures that downstream nodes receive complete information from upstream nodes, enabling proper data flow in graph-based workflows. Changes: - src/strands/agent/agent_result.py: Added to_graph_input_text() method - src/strands/multiagent/graph.py: Use to_graph_input_text() in _build_node_input() - tests/strands/agent/test_agent_result_graph_input.py: Comprehensive test coverage
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This was referenced Jan 13, 2026
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Superseded
This PR has been superseded by PR #1472 which implements Option 1 (modifying
__str__directly) as requested by @afarntrog.Closing this PR in favor of the cleaner approach.