Notes from the Saytu team

What we learn building a Live2D character that answers preorder, sizing and authenticity questions on anime storefronts.

Pixels, frames, contexts

Three ceilings a character runs into, and none of them say so

A Live2D character is a guest in somebody else's page. The pixel budget, the frame cap that made things worse, and the context limit that breaks the next character rather than the one that leaked.

Live2DSeptember 21, 20264 min read

The model only gets to paint inside three ellipses

One uploaded drawing becomes a face that blinks and speaks. Identity holds because everything outside three marked ellipses is the merchant's own bytes, not because the model was asked nicely.

Build logSeptember 21, 20264 min read

The metafields that crowded out the shop policies

Six policies against two and a half thousand metafields, one shared limit, and a refund policy the assistant never saw. Nothing was broken, and nothing reported it.

Build logSeptember 21, 20263 min read

What verified means when a source is switched off

A control that appears to work and does not is worse than one that visibly fails. Why retrieval reads the switch rather than the rows, and why the inspector is the same code path.

Build logSeptember 21, 20264 min read

Four records, and what the assistant is actually shown

Everything a store has written, narrowed to about two thousand characters for one question. The budget, the two ranking lanes, and the floor below which nothing counts.

Build logSeptember 21, 20264 min read

108 unread

We published 108 articles nobody read

They were written by a model, posted through our own API, and made public on arrival. One of them had no text in it. Here is the count, and what we changed.

Build logSeptember 21, 20264 min read