Field Notes

43 Tools Later: What Production MCP Work Taught Me Lessons from building a 43-tool MCP server for live affiliate ad-spend operations — tool granularity, auth lifecycle, caching semantics, and why error types matter more than error messages.
Agents That Don't Hallucinate Your Money Away: Guardrails for Automated Media Buying Notes from an 11-agent DSPy orchestration layer running against live ad spend — why autonomy is a dial, not a switch, and why the human approving spend is a feature, not a bottleneck.
The Support-System Doctrine Why I wrote in 2022 that an Agentsmith builds support systems for humans, not replacements for them — and how that line became the approval-gate architecture in a live ad-spend system four years later.