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[PR #5873] feat: Implement Tool-Based Structured Output for React Agent #4694

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opened 2026-02-20 17:50:36 -05:00 by yindo · 0 comments
yindo commented 2026-02-20 17:50:36 -05:00
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Original Pull Request: https://github.com/langchain-ai/langgraph/pull/5873

State: closed
Merged: No

Fixes #5872

Overview

This PR introduces a significant refactoring of the structured output approach in the LangGraph React Agent, replacing the previous two-step generation process with a more efficient tool-based method.

Key Changes

  • Converted response schema into a bindable tool for the model
  • Eliminated the need for a separate generate_structured_response node
  • Implemented a new respond node that handles structured response creation directly
  • Updated workflow routing to support the new tool-based approach
  • Maintained backward compatibility with existing agent workflows

Implementation Details

  • Modified create_react_agent to create a tool from response_format schema
  • Updated tool binding logic to include response schema tool
  • Created a new respond node function for structured response handling
  • Updated should_continue routing function to detect response schema tool calls
  • Refactored workflow construction to use the new respond node
  • Removed all references to the old generate_structured_response approach

Testing

  • All existing tests now pass
  • 121 tests successfully executed
  • Maintained full backward compatibility
  • Improved type annotations and code quality

This implementation provides a more streamlined and efficient approach to generating structured outputs in the React Agent.

**Original Pull Request:** https://github.com/langchain-ai/langgraph/pull/5873 **State:** closed **Merged:** No --- Fixes #5872 ## Overview This PR introduces a significant refactoring of the structured output approach in the LangGraph React Agent, replacing the previous two-step generation process with a more efficient tool-based method. ### Key Changes - Converted response schema into a bindable tool for the model - Eliminated the need for a separate `generate_structured_response` node - Implemented a new `respond` node that handles structured response creation directly - Updated workflow routing to support the new tool-based approach - Maintained backward compatibility with existing agent workflows ### Implementation Details - Modified `create_react_agent` to create a tool from `response_format` schema - Updated tool binding logic to include response schema tool - Created a new `respond` node function for structured response handling - Updated `should_continue` routing function to detect response schema tool calls - Refactored workflow construction to use the new `respond` node - Removed all references to the old `generate_structured_response` approach ### Testing - All existing tests now pass - 121 tests successfully executed - Maintained full backward compatibility - Improved type annotations and code quality This implementation provides a more streamlined and efficient approach to generating structured outputs in the React Agent.
yindo added the pull-request label 2026-02-20 17:50:36 -05:00
yindo closed this issue 2026-02-20 17:50:36 -05:00
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Reference: langchain-ai/langgraph#4694
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