[abuashiks22-crypto]

Summary

• declare Pexels/Pixabay API-key dependencies in the provider registry
• treat blank or whitespace-only environment values as missing while preserving non-empty process values
• load configured .env values when process variables are blank, without exposing credentials
• add focused provider detection and env-loading tests

Validation

• python -m pytest tests/tools/test_stock_provider_detection.py tests/tools/test_pixabay_per_page_clamp.py tests/tools/test_stock_source_adapters.py -q — 45 passed, 3 xfailed
• exact provider_menu_summary() preflight with safe dummy process values reported available providers pexels and pixabay; all four image/video tools reported available
• blank key verification reported all four tools unavailable
• git diff --check passed

No secrets or .env files were committed; only the tracked .env.example exists in the repository.

[calesthio]

Thank you for repairing stock-provider detection. Reviewed all dependency metadata, blank-key checks and the two env-loading paths against docs/PR_REVIEW_GUIDE.md. The new behavior fills blank process values from configured entries while preserving nonblank process values, and key-backed tools now advertise their dependencies honestly. Clean integration with current main: pytest tests/tools/test_stock_provider_detection.py tests/tools/test_pixabay_per_page_clamp.py tests/tools/test_stock_source_adapters.py -q --tb=short -p no:cacheprovider passed 45 tests with 3 existing expected failures. No credentials or live provider calls were used.