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FIELD NOTES

Engineering the agentic web.

Real architectures, real costs, real mistakes from building AI agents and LLM-powered products. Everything here is something we learned by shipping.

What Custom AI Agent Development Actually Costs in 2026

Real 2026 price ranges for custom AI agent development — by project type, what drives cost, and the recurring bills nobody warns you about.

August 9, 2026 · 6 min read · Cozz

Building Game AI That Actually Counters the Player (Without Cheating)

How WarGaze's AI commander reads your army and counter-builds — no rubber-banding.

August 9, 2026 · 5 min read · Rex Okonkwo

Designing a Trust Game: Bots That Bluff and a Server That Never Trusts

Game-theory bot design and server-authoritative money safety in a Roblox trust game.

August 9, 2026 · 5 min read · Rex Okonkwo

Multi-Tenant SaaS on Supabase: Row-Level Security Done Right

The membership-function RLS pattern that isolates tenants without trusting your API.

August 9, 2026 · 5 min read · Cass Ryland

Durable Multi-Touch Email + SMS Sequences Without Redis (pg-boss on Postgres)

How we built a fire-and-forget follow-up engine on one Postgres database.

August 9, 2026 · 5 min read · Cass Ryland

Adding an LLM to Your Next.js App Without Blowing Up Your API Bill

Six concrete patterns — streaming, caching, model routing, token budgeting, edge limits, and evals — for shipping an LLM feature in Next.js that stays fast and cheap.

August 9, 2026 · 4 min read · Cozz

ChatGPT Wrapper vs. Custom Agent: When Off-the-Shelf Stops Working

A honest decision guide for founders weighing a thin ChatGPT wrapper against a real custom agent — with the five failure points that force the switch.

August 9, 2026 · 4 min read · Cozz