Jeremy Ettlinger

Calls, puts & mise en place

Appel & Mise

Vol. IMonday, September 28, 2026 · 59° & light rain on the UWSThe daily, for Jeremy Ettlinger
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The lede

2026 in LLMs (so far)

Simon Willison · made the Sunday

Willison's closing keynote in San Jose is the year told as a timeline by the person who has been taking notes the whole way through, and the annotated slides read faster than the video: coding agents crossing the reliability line last November, the OpenClaw repository going from first commit to six figures of commits, tokenmaxxing mandated and then rescinded inside six months once it turned out the agents were expensive. The part worth sitting with is his read on Fable-class models — that if you can define a goal precisely, constrain it unambiguously and hand it the right tools, the model will brute-force the rest, which sounds like a threat until you notice that doing those three things well is the job.

AI & Agents

Anthropic

Prompting Claude Opus 5.5

Anthropic's model-specific guides have quietly become the best available documentation of how agents actually fail, and this one is organized as a symptom list: an unattended run that stops partway through after reporting progress, a chat that opens slowly because it thinks first, an agent across several connected apps that misses whatever the task did not explicitly point at. The entry on marking pasted text inside user messages is the one to read twice if anything you run takes input from somewhere you do not control.

Engineering & Leadership

John Allspaw, Adaptive Capacity Labs · made the Sunday

There is more to code review than (automatable) detection

Allspaw takes a paper arguing that agents can now perform all four stated functions of code review and answers it with the things that are not functions: a reviewer saying plainly that they do not understand the diff, which is itself the finding; the question of whether the change should exist at all; noticing what is missing rather than what is there; and knowing that this service had an incident last Tuesday. He calls the framing error the substitution myth, and it is the most useful thing you can carry into an argument about review policy — five weeks old and worth the archive trip.

Web & Product Craft

Matthew Prince and Michelle Zatlyn, Cloudflare

Cloudflare's 2026 Annual Founders' Letter

The numbers are the reason to read it: automated traffic passed human traffic in May, a year and a half ahead of Cloudflare's own forecast, and the web itself started growing again in mid-2025 after more than a decade flat, mostly because people who cannot code started shipping things anyway. The argument underneath is a tragedy of the commons — your agent reads a thousand menus to recommend one restaurant, and the other 999 absorb the load for nothing — with a second worry that agents default to whoever has been around longest, which is not encouraging news for anything you deploy this week.

New York & the Table

Melissa McCart, Eater NY

Upper West Side Icon Café des Artistes Is Reopening

The room at 1 West 67th Street opened in 1917 as a dining hall for an apartment building whose artist tenants had no kitchens, became a Lincoln Center institution under George Lang, closed in 2009, and has sat behind the Leopard ever since; Ariel Arce and Max Katzenberg are bringing the name back in early 2027, with Howard Chandler Christy's 1934 wood nymphs still on the walls. Before they design anything they have taken out an ad asking anyone who ever ate, worked or lived there to send in their memories, which is either good sense or good marketing and is probably both.

Diversions

Tara Badstubner, Literary Hub

Why Ghosts Are Haunting Us in 2026 (For Real)

Badstubner went to a writers' retreat in a dark Victorian pile upstate with barely a seedling of a novel about a young widow, and on the Wednesday night the four people around the dining table all stopped mid-laugh because they heard footsteps overhead. She is careful to say this is not a dramatization, which is the correct move, and the essay is really about why a grief novel wanted a ghost in it.

Loose Change

Ilan Kelman and Matthew Blackett, Nautilus

A Blow-by-Blow Account of What Would Happen If the Yellowstone Supervolcano Erupted Now

Two disaster researchers run the worst case as a countdown, and the pleasure of it is almost entirely in the monitoring: an analyst at the University of Utah seeing a swarm of earthquakes too small to feel, checking them against neighbouring seismometers, and calling colleagues more out of curiosity than concern. What makes volcanologists nervous is never one signal but several at once — a swarm migrating upward, GPS stations drifting apart, strain rising, satellite radar showing the ground bulging — and the honest part of the piece is how long after that the correct answer is still wait and see.

The Back Page

Sophie Downey, The Guardian

Chelsea turn up heat on Arsenal as Alyssa Thompson strike settles WSL derby

Thompson's first-half finish was enough at Stamford Bridge, with Katie McCabe facing Arsenal for the first time in eleven years from the wrong side of the tie and Bompastor able to start Walsh, James and Malard together. Arsenal had the better of the opening quarter and nothing to show for it, which has been the shape of their season; Renée Slegers says she is not worried, in the tone managers use once the question has started being asked out loud.

Around town

Thu Oct 1 · 1:00pm

NT Live: The Misanthrope

Leonard Nimoy Thalia, Symphony Space, 2537 Broadway at 95th

Martin Crimp rewrites Molière's 1666 comedy as a novelist who refuses to tell the socially useful lie and discovers what that costs, with Sandra Oh in the title role and Indhu Rubasingham directing at the National Theatre. Filmed on stage, so it is $25 and 150 minutes rather than a flight to London; Tuesday evening is sold out, this Thursday lunchtime is not, and there is a Saturday encore on October 24.

say yes

Thu Oct 1 · 8:00am

FinTech & FinOps Founders Meetup

Coffee Project FiDi, 135 John St

Coffee downtown with the people building the plumbing rather than the pitch decks. Free, small, and the FinOps half is the part most product engineers only meet when the bill arrives.

professional

Mon Oct 12 · 6:00pm

Agents in Production: Durable State

Venue given on registration, Manhattan

An evening on the unglamorous question that decides whether an agent survives contact with production — where its state lives when the process dies. Free, and closer to the metal than most of the month's panels.

professional

Mon Oct 12 · 7:00pm

Erin French, Seize the Supper

Peter Jay Sharp Theatre, Symphony Space, 2537 Broadway

The Lost Kitchen's chef on the rituals that turn a Tuesday dinner into an occasion, in conversation with Evie McGee Colbert. Tickets start at $20 without the book, which is the right tier if you already own more cookbooks than counter space.

casual

Quote of the day

“Nobody's agent would have recommended us.”

— Matthew Prince and Michelle Zatlyn

On this day

September 28, 1928 — Alexander Fleming, back from holiday, finds a mould has taken over one of his staphylococcus plates and, instead of tipping it out, looks at it properly.

The puzzle corner

The Mini · Wordle · Connections

Sixteen years ago this week Cloudflare launched with eight bugs left to fix and the engineers fixing them from the audience — worth remembering on a morning when the founders' letter is about agents making it harder for anything new to get found.