Archive: August 2026

6 posts from August 2026.

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

We integrated our invoicing provider's API trusting the test mode on each order. The API ignored it: the account decides the environment, not the order.

#invoicing#postmortem#idempotency#erp-integration

Nicolás Biondi· 3 min readRead 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