During October 2025, Sam focused on improving the reliability of the Gemini URL Context feature in the vercel/ai repository by addressing schema validation issues. He enhanced the grounding metadata schema using TypeScript and Zod, making the title field optional to prevent validation errors when titles were missing in both web and retrievedContext contexts. By applying .nullish() to relevant schema fields, Sam ensured consistent handling of optional data, reducing runtime failures and improving downstream robustness. His work demonstrated a strong grasp of schema validation and testing, resulting in a more resilient integration that aligns with the architectural standards of vercel/ai.