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Fix: Prioritize task output_json over LLM response_format

Summary

This PR fixes issue #3639 by establishing a clear priority hierarchy when both a task's output_json/output_pydantic and an agent's LLM response_format are set with Pydantic models. Task-level settings now take precedence over agent-level settings, following standard configuration hierarchy principles.

Key changes:

  • Modified LLM._prepare_completion_params() to accept a from_task parameter and check for task output settings
  • When a task has output_json or output_pydantic set, the LLM's response_format is ignored
  • Updated LLM.call() to pass the task object through the call chain
  • Added comprehensive test to verify the priority behavior works correctly

Review & Testing Checklist for Human

  • Manual verification: Create a scenario with both task.output_json=TaskModel and agent.llm.response_format=LLMModel and verify the task model is used in the result
  • Regression testing: Verify existing output_json and output_pydantic functionality still works as expected when no LLM response_format is set
  • Edge case testing: Test scenarios where task is None, where neither setting is present, and with different LLM providers to ensure no breaking changes

Notes

  • The fix is surgical and only affects the parameter preparation logic, preserving backward compatibility
  • All existing tests pass (1206 passed, 76 pre-existing failures unrelated to this change)
  • VCR cassette created for the new test to ensure consistent behavior

Requested by: João ([email protected])
Link to Devin run: https://app.devin.ai/sessions/b30fa7d430ca45ee99cd2f492b080702

This commit fixes issue #3639 by ensuring task-level output settings
(output_json and output_pydantic) take precedence over agent-level
LLM response_format when both are set with Pydantic models.

Changes:
- Modified LLM._prepare_completion_params() to accept from_task parameter
  and check if task has output_json or output_pydantic set
- If task has output settings, LLM's response_format is ignored
- Updated LLM.call() to pass from_task to _prepare_completion_params()
- Added comprehensive test to verify the priority behavior

The fix ensures predictable behavior following the standard configuration
hierarchy where more specific (task-level) settings override general
(agent-level) defaults.

Co-Authored-By: João <[email protected]>
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…e_format

Applied ruff auto-fixes to remove trailing whitespace from docstring
and blank lines in the new test function.

Co-Authored-By: João <[email protected]>
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