The letter

One letter a week, starting soon.

The week's signal, what shipped, what is worth running tonight, and the editor's note. No tracking, no ads, nothing else.

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Editor’s notes

A short letter from Tokyo, most weeks.

2026.10.13

A Passing Score Hides the Break

2026.10.10

An Old API Learns to Speak in Tools Overnight

2026.10.07

A Photograph and a Sentence Now Share an Address

2026.10.04

The Safest Agent Carries a Key That Expires on Its Own

2026.10.01

The Agent That Watches the Agent

2026.09.28

A Reranker Cannot Skim

2026.09.28Column

This Week the Answer to Agents Was a Box

2026.09.25

The Model Living Entirely on My Laptop

2026.09.22

The Good Part of a Plugin Is the File Nobody Reads

2026.09.21Column

Japan Ran Claude Code All Night and Wrote Down What Broke

2026.09.19

A Generated Diff Does Not Lie

2026.09.16

A Voice Agent Should Know When to Stop Talking

2026.09.13

An Agent Should Forget on Purpose

2026.09.10

One Agent Grading Its Own Homework Is Not a Review

2026.09.07

A Skill Is Only Real When You Need It

2026.09.06

Read the Diff Before You Accept It