Fix output file writes outdated task result after guardrail execution

[devin-ai-integration]

Summary

Fixes #4156 - Output file was being written with pre-guardrail output instead of post-guardrail output.

The bug occurred because the file save logic in both _execute_core and _aexecute_core methods used the original variables (json_output, pydantic_output, result) instead of the updated task_output object after guardrails executed and potentially modified the output.

The fix changes the file save logic to use task_output.json_dict, task_output.pydantic, and task_output.raw which contain the correct post-guardrail values.

Review & Testing Checklist for Human

• Verify async execution path works correctly - The tests only cover sync execution (execute_sync), but the same fix was applied to _aexecute_core. Consider testing with async execution to ensure the fix works there too.
• End-to-end test with real agent - The new tests use mocks. Verify the fix works in a real scenario where an agent executes a task with guardrails and an output file.
• Check _save_file handles dict types - When task_output.json_dict is used, it's a dict. Verify _save_file serializes it correctly.

Notes

• 5 new tests added covering: raw output, JSON output, pydantic output, single guardrail, and multiple chained guardrails
• All 26 guardrail tests pass locally
• Lint checks pass

Link to Devin run: https://app.devin.ai/sessions/dc1209f2778f4b72b9aad8e9bdebfff7
Requested by: João (joao@crewai.com)

---

Note

Fixes output persistence after guardrails

• Update crewai/task.py in both _execute_core and _aexecute_core to save output_file from task_output.json_dict → else task_output.pydantic.model_dump_json() → else task_output.raw, ensuring the post-guardrail result is persisted
• Add tests in tests/test_task_guardrails.py verifying output_file contains the final guardrail-modified output for: raw, JSON (with model), Pydantic, single guardrail, and chained guardrails

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[devin-ai-integration]

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