During June 2025, Cobhc Pinksawtooth focused on backend development for the google/mcp-security repository, addressing a critical issue in API correctness. They identified and resolved a type hint mismatch in the get_entities_related_to_a_collection function, updating its return type from dict to list[dict] to accurately reflect the actual output. This change, implemented in Python with careful attention to type hinting, improved type safety and predictability for downstream consumers. By refining the API contract and updating associated tests, Cobhc enhanced code maintainability and reliability. Their work demonstrated depth in backend engineering, emphasizing stability and long-term maintainability over new feature delivery.