Field notesUpdated weekly

Notes from
the build.

Engineering essays, post-mortems, and decisions we made out loud. Written by the people who shipped the code, not the marketing team.

Agents without prompts: building Claude tool-loops you can debug

After 18 months in production, here's how we structure agent loops so non-engineers can read the trace and tell us what went wrong.

// Archive — 2 posts

Headless services, residential proxies, anti-bot vendors. A practical decision tree for picking the right tool per site.

We've turned down growth twice. Here's the maths behind staying small — and what we ask before saying yes to the third.

// Subscribe