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Regression Detection

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⟐ Claude Code/2026-07-03Advanced

When a Claude Code Refactor Passes Every Test but Behaves Differently in Production — Catching Silent Contract Drift with a Behavior Diff Harness

Hand Claude Code a large refactor and your tests can stay green while production behavior quietly shifts. Here is how I record exception channels, log shape, init order, and return values as a signature, then diff them per commit to catch contract drift before it ships.

⬡ API & SDK/2026-06-26Advanced

When the Same Model Name Starts Behaving Differently: A Startup Canary for Unattended Pipelines

An in-place Opus upgrade can change your output, and an unattended publishing pipeline will never notice. Here is a lightweight startup canary that fingerprints behavior, catches drift, and halts the batch — with measured cost and latency.