Engineering notes
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Practical write-ups from YY's product and research work. Each note is tied to software, fixtures, samples, or measurements that readers can inspect for themselves.
Published notes
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Dataset operations · August 1, 2026
How to inspect a training dataset before uploading it
A practical preflight for inventory, exact and narrowly normalized duplicates, provenance coverage, secret-risk signals, and CI thresholds.
Agent systems · July 31, 2026
How to test approval-gated FunctionTools in OpenAI Agents SDK
Six concrete approval-to-execution properties, the evidence needed to check them, and the cases where missing observations must remain inconclusive.