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Amber store counter with a figure in shadow and stations glowing in cyan, violet and turquoise

AI Agents New

Boss and interns

How I split coding work across several AI models without the bill exploding

28 billion tokens in six months, 94% of them read from cache. How I split the work between one expensive model and several cheap ones at LENZ.

#delegation#caching#tokens#workflow

Nicolás Biondi· 4 min readRead the post

Empty chair in a hall with an ID card on the seat, lit between blurred chairs in the dark.

Lessons

The wrong key

We matched each sale to its row in the sheet instead of the camera sold, so duplicates slipped through

Nicolás Biondi· 4 minRead the post

A lone brass bell on a dark desk, crossed by a cyan beam and a violet glow.

Lessons

The test mode didn't test

We sent test mode on every order, but the invoicing API never checked: the account decides that

Nicolás Biondi· 3 minRead the post

A long line of light dots across the floor and a cyan frame enclosing one stretch, under a crescent moon.

Lessons

Midnight doesn't count

Our counter allowed 96 posts in 24 rolling hours and X blocked the bot at post 64

Nicolás Biondi· 4 minRead the post

A brass doorbell on a dark wall with its cut cable hanging, the copper ends barely shining.

Infrastructure

The doorbell won't ding

We changed a key and the alerts chat went quiet without a single error. Now we count the alerts that arrive

Nicolás Biondi· 3 minRead the post

Five copper pipes, each with a ring of cyan light; from one of them a thread of amber light drips down and forms a puddle.

Tokens & Costs

Free with a meter

A cache spent 2,400 writes a day on a plan that allowed 1,000

Nicolás Biondi· 4 minRead the post

A dim doorway with a blank hanger on the handle and three glowing duplicates fading beside it.

AI Agents

One sign per agent

Two agents shared one 'do not disturb' and clashed; now each hangs its own sign, with an expiry

Nicolás Biondi· 3 minRead the post

A wall opened up in the middle with two bundles of glowing cables, one cyan and one amber, shining at different intensities.

AI Agents

Nothing was broken

An agent touched four files in production over a fault that was in Shopify's index

Nicolás Biondi· 3 minRead the post

A tray of empty slots being filled by drifting cyan mist, beneath a suspended brass stamp glowing warm amber.

Ecommerce

The API played dumb

Three fields were missing and the API still said 'all good': it filled them in with whatever came to mind

Nicolás Biondi· 3 minRead the post

A small table bending under a huge cracked box, next to a small tidy cube of cyan light.

Infrastructure

Every click crashed it

We moved a 130 MB file to a real database, and each click dropped from 5 seconds to 0.6 ms

Nicolás Biondi· 4 minRead the post