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Notes from production.

Failure taxonomies, defensive patterns, and the architecture decisions that keep LLM systems from falling over at 2am.

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Meta-Prompting in Production: One File the Agent Can Touch, One Verifier It Can't

One AI writing prompts for another sounds like leverage until you watch it fail: an 80-node workflow that repeated every mistake, re-paid every failed run, and trusted every generated instruction. Tuning the meta-prompt never fixed it. A three-layer contract did: a verifier the generator can't touch, domain facts it can't ignore, generation left free in the middle. Two production failures in its first 24 hours stress-tested exactly that.

The Meta Layer10 min read
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