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jev is the best excuse you could possibly have to go re-read 12 factor agents

Argues tool calling decomposes into classify plus action, and that pipelines switching between classification, structuring, deterministic code, and small agent loops make Jev a useful building block.

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Dex Horthy’s post is a short argument rather than a project write-up. Tool calling, he writes, can be decomposed into classify plus action. He links to 12 factor agents, a HumanLayer repo of principles for building LLM-powered software good enough to put in front of production customers, and calls Jev the best excuse to re-read it.

His case for Jev: if you design AI programs as pipelines that switch between classification, structuring data, deterministic code and small agent-shaped chat loops, Jev is a useful building block. He is quoting Dillon Mulroy, who wrote that Jev resonates with developers because it lets them compose AI into systems and products rather than AI becoming the product.

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