During January 2026, Deniz worked on the phidatahq/phidata repository, focusing on improving the robustness of Cerebras API JSON schema validation. Deniz addressed recurring 422 errors by implementing a recursive enforcement of additionalProperties: false across all JSON object types, ensuring schemas consistently met Cerebras requirements. This approach, modeled after Anthropic’s schema validation pattern, involved updating request parameter processing to apply the fix for JSON schema-based response formats. Using Python, Pydantic, and schema validation techniques, Deniz’s work reduced API call failures and enabled more reliable integrations with Cerebras models, ultimately improving developer experience and the stability of downstream workflows.