The Series
Field notes from a daily practice with AI coding agents. Patterns, tools, sharp edges. Evidence-based, no fluff.
The Negative Control: Why a Test Suite of Only Positive Matches Cannot Catch Over-Matching
My invoice verifier passed 22 of 22 checks on two real PDFs, then passed a stale-bank check on a Chase-era invoice that still carried the old account numbers. Every assertion was a positive match. None of them asked the pattern to fail. <!-- cite: verifier output, session c7e3c270-7aeb-4369-9f2e-9e14496219bf -->
Readback Verification: When 'Typed: ✅' Means the Wrong Field Has Your Email
An automated form filler reported success on every field while silently writing each value one field late. The tool's own success signal confirmed a write happened, not that the right value landed in the right place.
Rejected Is Not Dead: The Liveness Probe That Killed Healthy Tunnels
My self-healing SSH daemon treated an auth rejection as proof the tunnel was gone. A rejection is proof the far end is alive and answering.
The Capability LinkedIn Never Shipped: Designing a Pipeline Around One Irreducible Paste
LinkedIn's API can fire feed posts on its own. It cannot create a Pulse article. I stopped trying to route around that gap and built the human paste into the pipeline as a first-class, gated state instead.
What we ship
ValidationForge proves that code works. Anneal proves the plan works before any code gets written. Two flagships, both production-grade. The other cards are companion tooling from the series.
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