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Aki Matsumura

Posts by Aki Matsumura

An illustration of a rotating airport baggage carousel beneath a large station clock, captioned 'Missing. No Error.', where a single suitcase keeps circling forever while every other bag has already been claimed

A WHERE updated_at > ? Sync Drops the Rows That Commit Late

2026.09.14

Say you’re moving order rows from one system…
A hero illustration headlined NO ONE CAUGHT IT, showing a fingertip pressing a button while a small red spark slips past an open hand and off the edge of the frame, unseen

An async onClick Handler’s Exception Never Reaches React’s Error Boundary

2026.09.08

Picture an ordinary form: a submit button that ope…
Hero illustration in which a single parcel carries two address labels for the same file, one written as file:///C:/tmp/entry-demo/cli.mjs and one written as C:tmpentry-democli.mjs, while the counter stamps them NO MATCH under the headline Same file, different spelling

Checking the Entry Point with import.meta.url in Node.js ESM, and How That Check Breaks

2026.08.31

One script, two machines. On Linux it does what yo…
An illustration of a gate at a fork in the road with the question 'Outlives the conversation?' written on it, and beyond the gate three signposts labeled 'Your Machine', 'Cloud', and 'CI'. The catchphrase 'One choice decides how far it runs' appears in the scene

How Should You Schedule Claude Code Runs?

2026.08.21

Every way to schedule Claude Code looks like it sh…
An illustration captioned 'Turning It Off and Deleting It Are Not the Same Thing,' showing a person at a laptop in an office surrounded by a mix of locked speech bubbles and open speech bubbles floating around them

ChatGPT Security Guidelines (Unofficial)

2026.08.21

What to Watch For When You Use ChatGPT at Work Ple…
A signpost at a night-time crossroads. One arm points down a narrow single lane marked only with the word 'Mathematica'; the other side opens onto a plaza filled with countless glowing, unreadable signs pointing in every direction

Where Claude’s SynthID-Text Watermark Actually Marks the Text

2026.08.19

Starting with models launched on or after August 2…
A wall clock and a strip of digital timestamp digits float side by side under the words 'Same Digits, Different Moment', hinting that identical numbers can point to different times

Why Timezone-less Date-Times Break Updates and Deletes When You Send Them as JSON

2026.08.17

When Updates and Deletes Started Failing Silently …
Illustration captioned 'SAME MUGSHOT, EVERY TIME' with an 'ENOENT' case file, where a detective examines the executable's mugshot with a magnifying glass while the folder that actually went missing quietly slips out through a background window

Node’s spawn names the executable in every ENOENT, even when your working directory is what’s actually gone

2026.08.11

It is a common pattern in deploy scripts: create a…
Hero illustration contrasting slides that ride correctly along a circle on one side with slides pulled inward along straight connecting lines on the other, carrying the text 'Where does a circle become a line?'

A circular slider whose inertia and autoplay run on CSS alone

2026.08.07

A slider whose slides ride along a circle. Part Fe…
A row of doors at dusk, one lit with a readable sign and another left dark with no signal at all, with the words 'Which Door Explains Itself?' worked into the hero illustration

Whose Job Is It to Open That Door?

2026.08.07

This is the sixth and final part of a six-part ser…
A lighthouse beam sweeping steadily over a harbor at night while several paddle-wheel boats keep turning on their own, with the words 'Watched, not stopped' worked into the scene

How Does MCP Handle Work You Can’t Wait For?

2026.08.07

This is part 5 of a six-part series called “…
A hero illustration of a visitor stopped by a security guard at the revolving door of another office building, while next door the visitor's own building has its lit lobby standing open. The words 'Blocked. But not stopped.' are lettered across the scene.

Can React Talk to an MCP Server Directly?

2026.08.07

This is part 4 of a six-part series called “…