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-## PR Title Format
-
-**fix: Fix o3-pro empty response issue by using output_text field**
-
-## Description
-
-This PR fixes a critical bug where o3-pro API calls were returning empty responses. The root cause was incorrect response parsing - the code was trying to manually parse `response.output.content[]` array structure, but o3-pro provides a simpler `output_text` convenience field directly on the response object. This PR also introduces a secure HTTP recording system for testing expensive o3-pro calls.
-
-## Changes Made
-
-- [x] Fixed o3-pro response parsing by using the `output_text` convenience field instead of manual parsing
-- [x] Added `_safe_extract_output_text` method with proper validation to handle o3-pro's response format
-- [x] Implemented custom HTTP transport recorder to replace respx for more reliable test recordings
-- [x] Added comprehensive PII sanitization to prevent accidental API key exposure in test cassettes
-- [x] Sanitized all existing test cassettes to remove any exposed secrets
-- [x] Updated documentation for the new testing infrastructure
-- [x] Added test suite to validate the fix and ensure PII sanitization works correctly
-
-**No breaking changes** - The fix only affects o3-pro model parsing internally.
-
-**Dependencies added:**
-- None (uses existing httpx and standard library modules)
-
-## Testing
-
-### Run all linting and tests (required):
-```bash
-# Activate virtual environment first
-source venv/bin/activate
-
-# Run comprehensive code quality checks (recommended)
-./code_quality_checks.sh
-
-# If you made tool changes, also run simulator tests
-python communication_simulator_test.py
-```
-
-- [x] All linting passes (ruff, black, isort)
-- [x] All unit tests pass
-- [x] **For bug fixes**: Tests added to prevent regression
-  - `test_o3_pro_output_text_fix.py` - Validates o3-pro response parsing works correctly
-  - `test_o3_pro_http_recording.py` - Tests HTTP recording functionality
-  - `test_pii_sanitizer.py` - Ensures PII sanitization works properly
-- [x] Manual testing completed with realistic scenarios
-  - Verified o3-pro calls return actual content instead of empty responses
-  - Validated that recorded cassettes contain no exposed API keys
-
-## Related Issues
-
-Fixes o3-pro API calls returning empty responses on master branch.
-
-## Checklist
-
-- [x] PR title follows the format guidelines above
-- [x] **Activated venv and ran code quality checks: `source venv/bin/activate && ./code_quality_checks.sh`**
-- [x] Self-review completed
-- [x] **Tests added for ALL changes** (see Testing section above)
-- [x] Documentation updated as needed
-  - Updated `docs/testing.md` with new testing approach
-  - Added `docs/vcr-testing.md` for HTTP recording documentation
-- [x] All unit tests passing
-- [x] Ready for review
-
-## Additional Notes
-
-### The Bug:
-On master branch, o3-pro API calls were returning empty responses because the code was trying to parse the response incorrectly:
-```python
-# Master branch - incorrect parsing
-if hasattr(response.output, "content") and response.output.content:
-    for content_item in response.output.content:
-        if hasattr(content_item, "type") and content_item.type == "output_text":
-            content = content_item.text
-            break
-```
-
-The o3-pro response object actually provides an `output_text` convenience field directly:
-```python
-# Fixed version - correct parsing
-content = response.output_text
-```
-
-### The Fix:
-1. Added `_safe_extract_output_text` method that properly validates and extracts the `output_text` field
-2. Updated the response parsing logic in `_generate_with_responses_endpoint` to use this new method
-3. Added proper error handling and validation to catch future response format issues
-
-### Additional Improvements:
-- **Testing Infrastructure**: Implemented HTTP transport recorder to enable testing without repeated expensive API calls
-- **Security**: Added automatic PII sanitization to prevent API keys from being accidentally committed in test recordings
-
-### Development Notes:
-- During development, we encountered timeout issues with the initial respx-based approach which led to implementing the custom HTTP transport recorder
-- The transport recorder solution properly handles streaming responses and gzip compression
-
-### For Reviewers:
-- The core fix is in `providers/openai_compatible.py` lines 307-335 and line 396
-- The HTTP transport recorder is test infrastructure only and doesn't affect production code
-- All test cassettes have been sanitized and verified to contain no secrets
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