https://blog.lgcode.me/tags/api-design/ Recent content in Api-Design on lgcode Hugo en-us Wed, 19 Aug 2026 09:00:00 -0300 https://blog.lgcode.me/posts/zero-is-not-unset/ Wed, 19 Aug 2026 09:00:00 -0300 https://blog.lgcode.me/posts/zero-is-not-unset/ A form field prepopulated with 0 silently shadowed every rate below it in an inheritance chain. The bug wasn't the zero — it was that the chain had no way to distinguish "the answer is zero" from "I have no answer". https://blog.lgcode.me/posts/mcp-tool-output-design/ Mon, 03 Aug 2026 10:00:00 -0300 https://blog.lgcode.me/posts/mcp-tool-output-design/ A filter that discarded the answer, a retry that couldn't work, a partial result posing as a total, and cached prices with no freshness signal. All four found in one live session, all four the same class of mistake.