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Notes from building AI systems.

Written for the people who build them, with the numbers and the parts that did not work. If you run a business and want the plain-English version, start with the guides in the footer.

September 24, 2026 · Local models · MCP

Designing a local model harness optimized for MCP use

Three days and about forty scripted runs of Gemma 4 and Qwen3 against an ERP over MCP. The pass rate went from 1 of 4 to 4 of 4 without changing the model. What changed was the layer between the model and the system.