Roger Peppe

After 4½ years I'm moving on from CUE Labs. Time for pastures new. It's been a blast!

Publishing “Cryptographic Right Answers” for developers is a tradition by now. Colin Percival started in 2009, Thomas Ptacek followed up in 2015, and then Latacora carried on in 2018 and 2024. I put together a list updated for the renewed urgency of migrating to post-quantum algorithms.

There is a lot to like in this proposal. #cuelang #quantified x.com/aramh/status...

Stupidly niche joke: ``` forall That {man: Man} ``` #rabbieburns #scotstrad #cuelang #quantified

Electric car emissions benefits are far greater than first thought Their results showed that the climate benefits were generally greatest when gasoline vehicles were retired at year one, resulting in a 58% reduction in carbon emissions over a 16-year period. www.futurity.org/carbon-emiss...

@kilbswc.bsky.social just saw a post from you. Is this the same Kilbs I knew way back at York Uni...?!

Can Jev refuse to answer?

a very effective presentation of androgen insensitivity (& indirectly, non-cell-autonomy, a core principle in development & evolution of multicellularity) in many situations, the cells in your body get external signals that tell them who they are & what they do, rather than knowing it internally

This was a good watch: www.youtube.com/watch?v=BFks... But this is talking about encoding 1 (probabilistic) bit of info: whether the text is watermarked or not. I wonder if it's feasible to use this technique to embed more bits, e.g. a user's name or location. Steganographic LLMs, anyone?

For any LLM sceptics out there. Russ is probably the most talented dev I've ever met.

I've seen it's being more common to put historical articles (eg all previous designs and associated documents) directly into a repo's content rather than leaving it in git history. What should I be thinking about this in this new age?

📣 We have released #cuelang v0.17.1 - including fixes for seven regressions, two hangs, and a few other bugs 🎉

📣 We have released #cuelang v0.17.0 - introducing module replaces, the `shortcircuit` language experiment, a new comprehension algorithm, and lots more 🎉

I'm officially looking around, if anybody needs a Go software engineer with a very strong background in web security lmk. I also know a fair share of frontend dev and was a SWE/SE for Google and Microsoft. I'm looking for security-sensitive dev projects and security reviews.

I'm here! Come by for a chat.

Are you still hiding if no one is looking? People aren't reading the code at all—they'd see the weird decoder+eval—and machines can see that and also the private use code points. Also, it's been public since May 2025 and GitHub/NPM/Microsoft have done nothing. www.aikido.dev/blog/glasswo...

A great example of how the Google #golang team put thousands of lines of ultra-technical code in service of an incredibly easy-to-use and useful tool. If you ever deprecate code, you really should know about the go:inline directive!

5 authors I've read at least 5 books by: E J Swift Adam Roberts Alasdair Reynolds Christopher Priest Adrian Tchaikovsky

Anyone I know gonna be at #FOSDEM or #cfgmgmtcamp ?

Interesting expansion of generics in #golang 👀

I don't understand why Claude is such a resource hog when it's not actually doing that much locally. For example, it's currently idle on my machine and it's coming up as using just under 500MB of memory. WTF?!

"Is it too much to expect that a hotel should provide an easily accessible mains power socket within a relatively short distance of the bed?", I think as I delve under my bedside table for the 5th night in a row. #firstworldproblems

One of the most frustrating things in the modern age: on an Android phone, having a set of photos selected in Google Photos and wanting to attach them to a specific Facebook reply.

super cool project: direnv done with #cuelang

Some pretty cool work on editor support (LSP) for CUE here. I really need to sort out my LSP acme game now!

I got something working nicely, for me at least. Shell script and commentary at: commaok.xyz/ai/split-com...

Using Claude Code, I sometimes find myself in the situation where I want to interrupt a generic sub-agent (but not its parent!) and tell it to do something differently. Is there some way to do that, or some other similar-ish UI that allows this kind of thing? @simonwillison.net might have ideas?

This video is brilliant: buff.ly/1zyTWmM Seems a total slam dunk that owners of private jets should pay fuel duties. Doesn't it? The answer is annoying. Thread:

I'm enjoying using Claude Code, but... why does it use so much CPU time when surely it's essentially just blocked on I/O almost all the time? Is it just doing some really inefficient polling or something?

So excited to finally share what we've been building at CUE Labs! Proud to be on this mission with @mpvl.io, @myitcv.io, @rog.bsky.social, @hylomorphism.bsky.social, and @dominikdm.bsky.social.

Today, I'm proud to officially announce CUE Labs! I co-founded CUE Labs with @mpvl.io to build a Configuration Control Plane, solving config chaos with CUE. Our work also provides the stewardship for the @cuelang.org open source project. Read our launch post: cue.dev/blog/announc...

This heartfelt and meaningful statement by Portland resident and author Cristina Breshears on another social media platform bears reposting here. I don't think the intent is to idealize Portland but to remind all of us what is important and why. (Posted here with permission.)

Just been mostly-vibe coding a PoC. I feel a bit like I feel when I'm on a drag lift up a ski slope: very aware how much work is being done for me. And then I get to play on the downhill after each feature is built. Lots of fun!

Been playing around with @cuelang.org and building a new home automation system to control my lighting and written up first post about the project still loads of other content to write though! Big thanks to @myitcv.io @rog.bsky.social @mvdan.cc for all there help aran.dev/posts/cue/us...

TIL Claude's new code interpreter mode has a /mnt/skills/public/ folder full of prompt instructions and Python utilities for creating and manipulating pdf, docx, pptx, xlsx files - and you can ask Claude for a copy and learn a TON about working with those formats simonwillison.net/2025/Oct/10/...

I swear using @cuelang.org is like having superpowers Just CUE-ified the lexicon for permissioned spaces, so much easier to have consistency and readability. The JSON form is generated into the expected directory. github.com/blebbit/atpr... #atdev #atprotodev @atproto.com