# Engineering notes from production AI.

URL: https://levystreet.com/engineering/
Updated: 2026-10-19

Practical AI engineering guides from Levy Street: reliable agents, evaluations, RAG, structured outputs, tool calling, MCP, observability and cost control.

## Short answer

These guides cover how to build AI systems that hold up in production: agent design, evaluation, retrieval-augmented generation, structured outputs, tool calling and MCP, permissions, observability, latency and cost control, and incident response. Each one is based on patterns Levy Street uses when building and running systems for clients and for its own products.




Published by Levy Street (https://levystreet.com), Wellington, New Zealand.