JavaScript · AI-Native

AI-Native JavaScript

Configuring agents, harnesses and feedback loops for this language. Updated as the tooling moves.

Start here

Setting up a coding agent for a JavaScript project

Node projects have the loosest defaults of any ecosystem here, which means the setup work matters more.

Set up the workspace

Writing an AGENTS.md for JavaScript

JavaScript needs a longer instructions file than the typed languages, and most of the extra length should be one list: what the platform now does that a package used to.

Build the loop

Testing JavaScript that calls a language model

Your function is now non-deterministic, slow, costs money per call, and streams. Here is a test strategy that still works — including for the streaming part, which is where most of the real bugs are.

Tracking and cutting token costs in Node

Node's specific cost problem is streaming: the user leaves, the stream keeps running, and you keep paying. That plus three other changes usually halves the bill.

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A battle-tested AGENTS.md, the review checklist, and the failure-mode cheat sheet for JavaScript. One email, then occasional updates when the tooling shifts. No course pitch.

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