I assumed the model would use the tools sensibly. It did not. What changed once I started designing tools the way I design an API: narrower inputs, typed arguments, and error messages written for the model rather than for me.
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How the Sunday slides agent proves it never changed a verse, why Claude only gets to propose design changes, and how the design pass went from 50 cents to 8 cents a build.
Every week the same few volunteers spent two hours or more chasing sermon slides, copying Bible verses and fixing line breaks. So I built them an agent that does it on Thursday evening, for about seven cents, and still lets a person say no.
Two Railway services, one cron, a webhook, a watchdog and a cost log. The real numbers from the Sunday slides agent's first weeks in production, including the Thursday it failed.
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If this note raised a question, or you would have designed it differently, I would like to hear it.
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