Worked on the pydantic-ai repository to enhance the clarity of retry prompt messaging in AI-assisted workflows. Developed a feature that introduces a 'Validation feedback:' prefix to model response messages when the content is a string and no tool name is specified, reducing ambiguity in error reporting during retry scenarios. Utilized Python for both development and testing, ensuring that the new messaging aligned with existing API integration patterns. Adjusted test usage statistics to account for minor token count changes, maintaining test reliability. The work focused on a single, well-scoped enhancement, with clean, traceable commits that improved developer experience in error handling.