Anthropic's Scion is heavily inspired by Mononoke (sunshowers.io)

164 points by sunshowers 2 hours ago

BryantD an hour ago

From the Anthropic announcement:

“Source control for huge monorepos has prior art, notably Google’s Piper and Meta’s Sapling, so we were able to build Scion with their hard-won lessons in mind.”

Mononoke is a component of Sapling, as I understand it. In fact, the repo link provided in this article links to a subdirectory of the Sapling repo. I’m not totally sure I understand the complaint.

WhitneyLand 5 minutes ago

If I credit my newly introduced car as inspired by Corvette, then sure, it might be ok not to mention the engine (Mononoke is the server part of Sapling)

However if my new car's engine is a near copy of the one in the Corvette, and my announcement gushes about the engine using the same terms the Corvette design team invented...

Then can you see how a mention might be nice?

sunshowers an hour ago

The level of inspiration goes well beyond "hard-won lessons". Something like Lore (slop design document aside) can claim that level of inspiration. Here the data model is a direct copy, down to the terminology.

To be uncharitable, this is marketing for Anthropic's impending IPO.

whiplash451 an hour ago

I see correlation instead. You IPO when you grow like crazy. You build something like scion when you grow like crazy.

devin 7 minutes ago

muglug 40 minutes ago

solid_fuel 31 minutes ago

> Here the data model is a direct copy, down to the terminology.

That’s not surprising to me - they designed and built it using their LLMs, of course it’s duplicating prior work. That’s essentially the core of what LLMs do, after all.

simonw 32 minutes ago

Why is that bad?

Mononoke and Sapling are open source systems. Why shouldn't new software take inspiration from how they are designed?

sunshowers 31 minutes ago

gorgoiler 4 minutes ago

LogicalRisk 23 minutes ago

teaearlgraycold an hour ago

> hard-won lessons in mind

Another Claude-written article

bayindirh an hour ago

> Another Claude-written article

This is the load-bearing seam.

wiml 8 minutes ago

MeetingsBrowser an hour ago

When Fable first released, I had it "one shot" a project using an initial spec and a team of agents. I was blown away with how good the results were.

And then I noticed some links to images from random small github projects and realized somewhere along the way agents had searched for existing projects and copied almost everything.

I wonder if something similar happened here on a larger scale.

bushido 35 minutes ago

GitHub is to agents what StackOverflow was to developers back in the day (in a meme kinda way).

More seriously, I'm curious if you checked on the licensing of said codebases, were they permissive or strong copyleft?

hetspookjee 44 minutes ago

I think a lot is memory really. For fun you can try pointing just about any model against the older kaggle challenges and it’ll come up with more or less the winning solution from memory. It’s here where you see a Gemma 27b perform about the same as opus 5.5

elmer2 41 minutes ago

It's the same for CTF challenges. Many get 'solved' because a writup was found and steps were followed.

6879346626 an hour ago

Is this what is expected of how to cite sources? Because if this is the expectation nobody does it.

There are two cases and only one is an issue for citations: - Mononoke was directly consulted and not attributed - Concepts were reinvented or used as a derivative (Sapling cited Mononoke and implements something similar)

For one I know Sapling, Git, and Jujutsu, but up to today I have never heard of Oxide or Mononoke and I am not exactly compelled to look up the research papers of any of them, at most I read through their high level documentation.

sunshowers an hour ago

To be clear, Mononoke is the server-side part of the Sapling system as deployed at Meta. Scion appears to be very closely inspired by Mononoke.

mad_vill an hour ago

Oh wow. Being pretty new to meta and seeing the anthropic announcement I was thinking to myself “wow that sounds a lot like sapling”.

I guess that is the case.

cmrx64 an hour ago

hi rain :) Anthropic’s post reminded me a lot of your work, glad this is getting some visibility. do you think the “time has come” for some of these ideas that previously may not have spread because they need too much learning to appreciate? I wonder what new norms will emerge in creative collectives.

sunshowers 41 minutes ago

Thanks! Yeah, I think overall several more organizations are going to reach the scale that Meta reached a while ago. I'm not sure if they'll go in the monorepo or polyrepo direction, though; I can see arguments both ways.

wakamoleguy an hour ago

Agents tend to act differently than humans here. I would have expected most humans to notice and acknowledge the connection. Passing it off as one's own insight definitely feels like plagiarism. Agents are generally not equipped to deal with this type of thing, since looking for prior art is a detour from their goal or an exercise in post-hoc rationalization of knowledge built into the weights.

Whether it is plagiarism or hacking, the buck has to stop with the operators. It's not a good look.

flakiness an hour ago

Can anyone explain the difference between sampling vs mononoke?

Edit: I was too lazy. From the README: "Mononoke is the server built for the Sapling Source Control System"

sunshowers an hour ago

It's a bit complicated:

1. Sapling can refer to either the system as a whole, or just the client people use (`sl`, forked from `hg`).

2. EdenFS is the virtualized FUSE filesystem (closely modeled after SrcFS at Google).

3. Mononoke is the distributed system that implements the backend server storage + the API they describe for checkout-less writes.

All three come together to form the core of the Meta source control experience. From what I can tell, Anthropic built its own version of 1 and copied 2 and 3, plus also built out a code review tool separately.

duhhhhh1212 2 hours ago

Damn. It’s hard not to see it as plagiarism. I can only imagine the surprised Pikachu face you must have made reading that announcement from Anthropic.

dboreham an hour ago

Similar to how git was "inspired by" BitKeeper and Monotone?

sunshowers an hour ago

I do not think Linus has ever claimed that Git wasn't following in the footsteps of those systems.

InsideOutSanta an hour ago

arjie 38 minutes ago

The company is predominantly FAANG people. They’re going to just rebuild what they know. I don’t think you need any kind of conspiracy here. One year into ad tech and everyone was using HyperLogLog. Everyone was using 20 years ago LMAX-style disruptor, and single threaded event queue powered by loop called governor. It’s just what happens. People carry in their head what they know.

IP maximalism is the present zeitgeist but that’s just how knowledge flows.

sunshowers 35 minutes ago

Help me understand. When you write a post about designing a system, do you not do some basic diligence about what existing systems you resemble?

Open source is not IP maximalist by any means. I am merely asking that the appropriate credit be provided.

arjie 31 minutes ago

No. I actually don’t do that and I don’t think that all human work should be O(n) deduplication gated.

Written about it here before: https://wiki.roshangeorge.dev/w/Blog/2026-09-08/Intellectual...

It isn’t something I care very much about, except when it’s used as a certificate of achievement. I almost never do literature searches with an attempt to dedupe. I only ever do it to see if someone has explored something better than I have. That’s often the case but other times it is not.

sunshowers 29 minutes ago

kccqzy 20 minutes ago

Absolutely not. When I create projects I only credit other existing systems if they are a direct inspiration. If I independently come up with the same idea as someone else I see no reason for me to do the due diligence and credit them.

sunshowers 10 minutes ago

gizajob an hour ago

This headline is very confusing for fans of Basic Channel / Chain Reaction records.

fhdkweig an hour ago

It is also confusing to fans of Studio Ghibli.

exe34 36 minutes ago

Once it's been through the slopotron, the provenance is laundered away.

jauntywundrkind an hour ago

Woo, I got cited. https://news.ycombinator.com/item?id=50076122

Another effort I couldn't have done without Astra. Even more so. All I did, the only reason I got cited, was because I'd asked Astra.

sunshowers an hour ago

Thanks!

forrestthewoods an hour ago

I really really wish Sapling could be used externally. It is by-and-large TheWay.

Centralized, virtual file system, all commits automatically on cloud, large binary files totally fine, Mercurial CLI. It’s fantastic. People who only use Git really don’t understand how much better things can be.

Shish2k an hour ago

Working for a few years at Facebook, and then returning to the normal world, it was like stepping back in time -- I really think that the mainstream git culture (by which I mostly mean "github") achieved a local maxima around 2012, and has been holding the industry back since :(

(Like GH finally has some support for stacks, 15 years late, with an implementation which is somehow more complicated and less powerful than the prior art...)

forrestthewoods an hour ago

> [Git/GitHub] achieved a local maxima around 2012, and has been holding the industry back since :(

I agree so hard. It’s inertia is too strong and we’ve stalled progress for a decade.