Our monitoring said everything was fine. Customers said it wasn't. Turns out, the API returned HTTP 200 for every response — including the ones that failed. The dashboards were blind.
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Hello, I'm Luke
Applied AI architecture, agent harnesses, and notes from getting AI systems into production.
Latest Posts
- A client's AI coding agent had contents:write on every repo in the org. When I asked who approved that, the answer was "the setup wizard." The defaults are the danger zone.
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- Two teams, one PostgreSQL instance, zero ownership boundaries. A consulting story about what happens when microservices share a database — and how we eventually untangled it.
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- A Renovate auto-merge bumped a transitive dependency from 6.2.1 to 6.2.2. The patch fixed rounding behavior. Our invoice calculations disagreed.
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- A client's checkout endpoint had idempotency keys. Customers still got double-charged during flash sales. The bug was a three-line race condition between SELECT and INSERT that took two weeks to find.
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