Reilly Wood

It’s been approximately 1 million years since I last wrote about how I use and think about LLMs. I figure I should document the state of things these days; if nothing else, it will be a time capsule.

Coding vs Writing

Something like 99% of my coding is done by agents now. If I’m in a text editor or IDE, it’s almost always to write prose (documentation, comments, etc.) because:

1. Writing is an act of thinking; it helps me gather and focus my thoughts
2. I want to give my coworkers a positive signal that I have put thought+effort into whatever I ask them to read. Text that was obviously generated by an LLM is a negative signal.

Agent harnesses

The Codex and Claude desktop apps are my daily drivers, I mostly stopped using the TUIs a few months ago. They have nicer UI with lots of bells and whistles, and they can both connect to remote servers over SSH. There isn’t as much reason to build or use sophisticated TUIs these days, and that’s a little bittersweet for me as someone who spent a lot of time getting good at building terminal applications.

I spend about half of my time in auto mode and half in YOLO mode. I’d like to use auto mode 100% of the time, but in Codex I find it a little buggy.

Models

Model-wise, I’ve been impressed (like everyone else) by gpt-5.6-sol and Claude Fable. I threw them both at some problems that previous agents struggled with (multiplayer text editing in a very idiosyncratic web app, remote connections in my systemd UI) and they nailed them. I’m also very impressed by the price/performance of gpt-5.6-luna and have switched to it for lower-end-higher-volume use cases. I’m using Anthropic models a bit less than OpenAI ones these days, partially due to cost/value and partially because Claude-isms are wearing on me.

I’ve also played around with OpenCode and some of the top-tier Chinese models; GLM 5.2 is quite capable and can be served very very fast. The speed makes more of a difference than I expected, I think because it helps with deep focus. When the agent returns back to me ~immediately, I’m far less likely to get distracted and context-switch.

Cheap LLMs open up new use cases

The price of decent models has dropped a lot lately, and that opens up some interesting new use cases. Bluesky supports custom feeds, and now I consume most of my social media through a custom feed which scores+filters every post by people I follow through Luna for about $5/mo. Nobody’s immune to rage-bait and doom-scrolling (least of all me), and this is a remarkably effective way to curate my social media diet. I spent a bit of time experimenting with even cheaper models on OpenRouter, but wasn’t happy with the performance compared to Luna.

“The future is already here – it’s just not evenly distributed”

This old Gibson quote comes to mind nearly every day. I have access to better budgeting and financial tracking than anyone using bank and fintech websites, because coding agents are great when given a bunch of CSVs. I’m sure fintech companies will catch up eventually, but right now we’re in an interesting in-between period.

Likewise, the custom filtering I do with Bluesky seems like a natural feature for any social media network once the cost comes down a bit more.

And this isn’t even touching on the huge numbers of non-programmer domain experts who haven’t yet realized that they can speak their own custom software into existence. That will change, and it’s going to be interesting to watch.

Intentional learning

Back when we were writing code “by hand”, it was easy to develop a deep understanding of your code because you had to think real hard about how to write it! That’s no longer the case.

I’ve tried a few different approaches for intentional learning and this skill by Cat Hicks has been the only one that’s stuck. It prompts an agent into quizzing you on the code it just wrote; I find that engaging in that dialogue is useful because it forces me to meaningfully engage with the material (as opposed to documentation that is easy to skim over).

Local voice transcription is really good now

I make heavy use of voice transcription (mostly via Handy and one of the Parakeet transcription models). Agents do better the more (relevant) context you give them, and rambling into a microphone is a very fast way to dump context. This would be very annoying to my coworkers if I worked in an office, so I’ll enjoy this little perk of remote work while I can.

More vs Better

Sometimes I use these tools to ship something fast, quality be damned. And other times I use them to ship better software than I’d otherwise be able to. As a example, systemctl-tui now has a sophisticated test suite that runs across a large number of systemd versions; this is something I could have built on my own but simply didn’t have the time for, and it caught real bugs the first time I ran it.

David Crespo’s “I’m not cutting corners” post is a good read on this topic.

We moved to a house in Vancouver, which is pretty crazy if you know the local real estate market. Never thought I’d be able to afford an actual house in a central neighbourhood.

As is my wont, I think a lot about the history+policy that led us here. I’m in a pocket of East Van that popped up overnight circa 1912 in a speculative building boom. Tons of cookie-cutter houses from Sears catalogs (that have since become quite nice+diverse through the magic of How Buildings Learn).

In the 1960s, the area was pre-emptively downzoned to forbid apartments. And so my street is essentially frozen in the same physical shape as a century ago, even though a lot more people want to live here now. I am arguably a beneficiary of this approach to urban planning; I get a house with a backyard in a very central area, at a (relatively) low price because I didn’t have to compete with apartments+condos for the land. It works out a lot worse for the people who are forced out to the ‘burbs.

Our old greyhound had trouble with the stairs, so we had a ramp made for him:

It’s nice to be able to make changes like that without asking permission, because coordination is hard! For example I considered installing a heat pump in our old condo, but never quite got around to seeking permission from the strata council. Here I can just do things.

This is the first time I’ve lived on a quiet side street in Vancouver (because we tend to concentrate multifamily housing on busy arterial roads), and that’s a massive improvement to my quality of life. I’m also loving having windows on all 4 sides. We need to do better at allowing condos+apartments with nicer layouts.

Unite Here Local 40 is a BC hospitality workers’ union: hotels, airports, food service. In 2026 they became one of the most active forces at Vancouver City Hall, and they’ve been pretty explicit that the goal is to affect the outcome of October’s election.

The especially weird part is that they’re spending an enormous amount of time and money mostly opposing new hotels. Not asking for better wages or asking that they be union-operated, just opposing hotels using whatever argument might stick. This post is an attempt to chronicle what I think is a big development in local politics.¹

It’s been quite a year. Here’s a grab bag of what stuck in my mind from 2025 and what’s coming next.

Personal Stuff

I started 2025 with a New Year’s resolution to deadlift 300lb. I hit 300 in the middle of the year, upped my resolution to 350lb, but only made it to 310lb. I’d like to hit 350 in 2026, but if I plateau and stay healthy I’m fine with that too.

My big resolution for the new year is to host a gathering at least once a month. Doesn’t have to be anything fancy, just an excuse to see people. My plan to make this happen: even if I’m busy, it’s easy to make a big batch of pasta and have guests bring side dishes and wine.

2025 was the first year I really noticed my dog getting old. He’s 11 and doing well for his age, but I’m more aware that I probably only have a few more years left with him. Retired racing greyhounds make great pets:

We spent a lot of time in late 2025 looking at real estate. After 7 years we’re a little bored of our current place and it’d be nice to have a bedroom for guests. It’s been an emotional roller-coaster; in November we had an offer accepted for a gorgeous condo downtown, only to back out after the inspection found some issues. But hey, it could be worse - when we bought our current place the market was so hot that people didn’t even get inspections done 😬.

Work Stuff

I got promoted to Staff Engineer in December. This required a ton of effort plus some luck, and I’m very proud of it; feels like I finally made it, y’know? The promotion felt especially good because during the tech job rout of late 2022 I accepted a Staff offer from another mid-sized tech company, and then after 3 weeks of delay they retracted it.

Overall it was a very good year for work. I shipped a product, worked on a high-profile keynote demo with OpenAI, and changed teams to launch a new product that’s attracting a lot of interest. I also flew down to SF twice to give talks for work; here’s one I’m particularly proud of.

Software

It is an incredibly crazy time to be working in software.

It feels like 2025 was the year where agents blew up. 1 year ago, I was occasionally using Aider to make commit-sized changes to software projects, and I felt like I was ahead of the curve. Today I tend to use Claude Code (sometimes Codex CLI) to make more ambitious changes, and they are far more capable of iterating on a change until they get it right.

My day to day now involves less “hands-on” coding and more high-level management of coding agents. It’s become incredibly cheap to try things out, and Opus 4.5 is remarkably capable.

I’m spending a lot of time with these new tools and I still feel quite a bit of FOMO. It helps to know that I’m not the only one.

Among people who do a lot of agent-assisted software development, there is some skepticism about whether MCP is useful:

A quick experiment makes this clear: try completing a GitHub task with the GitHub MCP, then repeat it with the gh CLI tool. You’ll almost certainly find the latter uses context far more efficiently and you get to your intended results quicker.

This is a fair criticism; in some scenarios an agent does better if we let it go wild with bash (which is effectively giving it the ability to write+run code) and a CLI tool. I also agree with Armin’s assertion we need better ways to compose MCP tool results. But I still think MCP is useful as-is, and I’d like to sketch out why I believe that.

MCP is simple

To connect an AI agent to an MCP server, I don’t need to download anything; I just provide a URL. Authentication is taken care of as part of the connection (more on this later). Tools are annotated with info that indicates whether they are safe to run. My agent doesn’t need to be able to execute code, and it doesn’t even need a filesystem.

It’s true that this agent might be less flexible or powerful than one with the ability to run arbitrary code. But that’s a tradeoff, and people are exploring ways to combine MCP with code execution - this is something to keep an eye on in 2026!

Programmers are weird

I’m a programmer who spends a lot of time with coding agents like Claude Code and Codex CLI. You could think of me as a power user driving an agent semi-interactively, and most people discussing MCP are in the same boat.

CLI tools are often a viable alternative to MCP for us, but a big part of that is that we can evaluate whether any given call to bash looks safe. That is not a skill that most people have.

OK, sure, we can’t expect most users to validate bash commands. But can’t we just sandbox their agents?

Maybe someday! But sandboxing is hard, and I don’t think anyone’s fully solved the UX around it yet. Are you sandboxing all of your agents today? The answer is “no, it’s too much of a hassle,” right?

Toward Autonomous Agents

Let’s step away from the well-trodden path of Claude Code. Say you’re building an agent that operates autonomously based on untrusted data. To make this more concrete, let’s say it’s an incident investigator agent; when a monitor goes off, it tries to find the root cause using data from your favourite observability provider. How do you give that agent access to your observability data?

If your observability provider has a CLI available, the agent could use that. But using a CLI means:

1. Your agent will need access to a filesystem (provisioned with a copy of the CLI)
2. Your agent will need a sandbox to stop malicious code execution and resource exhaustion
3. You’re opening yourself up to credential exfiltration attacks. The CLI needs credentials to talk to the observability provider; if the agent can execute arbitrary code, it can almost certainly read those credentials.

All of these problems go away if you connect your agent to an MCP server instead. MCP can get a production-ready agent off the ground almost immediately.

Putting it all together

MCP is a dead-simple way to give agents access to tools safely, and it works today. For some agents, that simplicity is extremely valuable; for others it is not. As you move away from expert oversight and toward fully automated agents, the case for MCP grows stronger.