Engineering notes
Useful details, shown in full.
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
We publish when there is a concrete workflow, boundary, or result worth examining—not to fill a content calendar.
Calibration records · August 4, 2026
How to clean a calibration certificate backlog without guessing
A source-linked workflow for matching certificate fields to an existing gage list while keeping missing or conflicting facts in a separate review queue.
Reproducibility contracts · August 2, 2026
What deterministic means in an AI tool
A code-backed checklist for input scope, ordering, canonical serialization, versioning, environment, and the limits of unkeyed identities.
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.