What spec-driven development is and why AI coding tools are splitting into competing camps

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The article explains spec-driven development (SDD), where requirements are written as a clear document that AI agents work from rather than from chat memory. It describes three traits of SDD: specs are version-controlled files, humans approve them before code is written, and every implementation step can be traced back to the spec. The author notes that the real differences between SDD tools lie in how specs relate to verification, not in feature counts. Three maturity levels are outlined: spec-first, spec-anchored, and spec-as-source, each answering differently who judges whether code is correct. The piece is the first part of a series comparing these tools.

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