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API-first vs code-first in 2026: the decision changed once AI agents joined the team

This story is from 2026-10-03. It is preserved in the archive; the latest stories are on the live feed.

The API-first versus code-first debate has been running for fifteen years, and for most of that time code-first quietly won. Spring annotations, FastAPI decorators, and Swashbuckle made generating a spec nearly free, while a hand-maintained spec rotted the moment a deadline hit. Then two things cha…

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  1. 2026-10-03 18:21 · DEV Community — AI
    API-first vs code-first in 2026: the decision changed once AI agents joined the team

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