Let the model do things — without letting it do anything.
Function calling is where a model stops talking and starts acting. You will watch the whole loop run on the page — define a tool, the model calls it, your code executes, the result goes back — and then spend the second half on the part that matters: allowlists, confirmation gates, and why anything touching money computes once and acts once.
Press play and a teacher talks you through the whole build, with a read-along transcript that highlights as it speaks.
Working, offline interactives — not screenshots. When the narration says "try it", the thing is right there.
No account, no app, no subscription. It runs from a single HTML file and will still run in ten years.
Every number is computed live on the page from inputs you can edit. Nothing is asserted that cannot be checked.
Written for builders ready to let a model take actions.
Implement the full tool-call loop yourself
Write tool schemas whose descriptions actually steer the model
Gate destructive actions behind explicit confirmation
Make money-touching tools idempotent and auditable
13 chapters, the first four free
The free preview is not a teaser: those chapters are complete, and the paid chapters are physically absent from the preview file rather than hidden behind a script.
What this hour is, how to use the page, and the interactive demo you will keep coming back to.
Part of the free preview — the full narration, page content and exercises, nothing held back.
Part of the free preview — the full narration, page content and exercises, nothing held back.
Part of the free preview — the full narration, page content and exercises, nothing held back.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.
Narrated in full, with the on-page build and exercises for this idea.