Discussion

• @fried_rice Chaofan Shou on x

  Claude code source code has been leaked via a map file in their npm registry! Code: https://pub-aea8527898604c1bbb12468b158 1d95e.r2.dev/ src.zip [image]

• @scaling01 @scaling01 on x

  A few take-aways from the Claude Code Leak: - Anthropic is actively using Capybara (Mythos) for development - they are already at Capybara v8 - Capybara still has issues with over-commenting and false-claims - Capybara has 1M context and fast mode - Numbat is another interesting …

• @gergelyorosz Gergely Orosz on x

  This is either brilliant or scary: Anthropic accidentally leaked the TS source code of Claude Code (which is closed source). Repos sharing the source are taken down with DMCA. BUT this repo rewrote the code using Python, and so it violates no copyright & cannot be taken down! [im…

• @wesbos Wes Bos on x

  Claude Code leaked their source map, effectively giving you a look into the codebase. I immediately went for the one thing that mattered: spinner verbs There are 187 [image]

• @itsolelehmann Ole Lehmann on x

  i can't believe more people aren't talking about this part of the claude code leak there's a hidden feature in the source code called KAIROS, and it basically shows you anthropic's endgame KAIROS is an always-on, *proactive* Claude that does things without you asking it to. it [i…

• @altryne Alex Volkov on x

  If you, like me, just woke up, let me catch you up on the Claude Code Leak (I know nothing, all conjecture): > Someone inside Anthropic, got switched to Adaptive reasoning mode > Their Claude Code switched to Sonnet > Committed the .map file of Claude Code > Effectively leaking t…

• @jpschroeder Justin Schroeder on x

  My overall takeaway: it's a really well laid-out codebase that is carefully organized to let agents work on it effectively.  Direct human intervention here is minimal, but...still apparent.  I'm a bit surprised by some of the shortcuts Claude Code makes, like its prompt assembly …

• @scaling01 @scaling01 on x

  the leaked claude code repo is now property of the “great chinese communist party” > 2000 open issues, mostly in chinese [image]

• @rahatcodes Rahat on x

  Claude Code has a regex that detects “wtf”, “ffs”, “piece of shit”, “fuck you”, “this sucks” etc. It doesn't change behavior...it just silently logs is_negative: true to analytics. Anthropic is tracking how often you rage at your AI Do with this information what you will [image]

• @vineetwts Vineet on x

  I created documentation over Claude Code's Codebase, which explains - Its pipeline - How it works - How it handles Context - How it handles Memory & More Read it here - https://www.mintlify.com/... [image]

• @scaling01 @scaling01 on x

  they have kairos, dreaming, ultrathink, ultraplan, ultrareview and complete integration with github and slack [image]

• @roundtablespace @roundtablespace on x

  The leaked Claude Code source has 44 hidden feature flags and 20+ unshipped features. - Background agents running 24/7 - One Claude orchestrating multiple worker Claudes - Cron scheduling for agents - Full voice command mode - Actual browser control via Playwright - Agents that […

• @gergelyorosz Gergely Orosz on x

  Ironic how Anthropic sells Claude Code security reviews positioned as something v powerful (costing $15-25 per PR review), and being clear they use it on all PRs... then leaking all of Claude Code's code thanks to publishing their sourcemap. AI won't save you from yourself!

• @birdabo Sui on x

  > anthropic's biggest leak yet. > someone made a repo about it. > repo hit 50k forks. 40k stars > anthropic starts hitting devs with DMCA. > bro got scared. > he converted everything to python. > genius move. > he aint satisfied. > rewrites everything in rust. bro is fearless. [i…

• @tszzl Roon on x

  hmm I guess if I squint I can understand why anthropic included 100 MB of the plain UTF Tibetan Kangyur canon in the Claude code package ... but it is a bit strange ...

• @cmuratori Casey Muratori on x

  Does any of it violate copyright? According to Anthropic itself, their devs do not write any code by hand. As far as I know, AI-generated code is not copyrightable under US law. So correct me if I'm wrong, but you should not be able to use the DMCA to take down this code, right?

• @beginbot @beginbot on x

  wow @garrytan just exposed Anthropic as total frauds Claude Code was ONLY 512K LOC ☹️ Gary is shipping 37K LOCs PER DAY so Gary could recreate all of Claude Code in ONLY 13 days! a supposedly $380 billion is big trouble

• @semianalysis_ @semianalysis_ on x

  NON-PROFESSIONAL & ENGAGEMENT BAIT: Anyone “classically trained” to write code pre-LLMs will take on look at the leaked Claude Code repo and see that it's a pile of unmaintainable slop. However, it is becoming increasingly clear that this doesn't actually matter. Coding is no

• @patrickmoorhead Patrick Moorhead on x

  Claude will finally get agents and orchestration with its next model. It's one thing that makes Perplexity Computer so unique.

• @sahilypatel Sahil on x

  Anthropic built two anti-distillation systems into Claude Code to stop competitors from training on its data One injects fake tool calls into your sessions to corrupt training data. another strips all tool call details into vague summaries before they leave the CLI [image]

• @altryne Alex Volkov on x

  Claude Code got leaked, all I wanna know if anyone was able to confirm the caching bugs that cause everyone's quotas to burn

• @elonmusk Elon Musk on x

  Banger 😂 [image]

• @mweinbach Max Weinbach on x

  The Claude Code leak isn't a big deal anymore and while it's cool to see, it's not showing us anything we didn't know. You could ask Claude to explain its harness and it would tell you in detail. Anthropic is probably rightfully upset, but this isn't a big deal. [image]

• @millionint Jerry Tworek on x

  The world needs at least one more large-scale successful AI research lab

• @thdxr Dax on x

  claude code source is 512K lines opencode is 118K we're getting LOC mogged

• @scaling01 @scaling01 on x

  most interesting features in the Anthropic CC repo: - Kairos: always-on autonomous agent mode - dream: nightly memory consolidation - teammem: shared project memory - buddy: tamagotchi-like pet system with models

• @stevekrouse Steve Krouse on x

  can someone at anthropic tell us who designed this / came up with these? it's very subtle and delightful and i want to give credit where it's due

• @thestalwart Joe Weisenthal on x

  Me looking through the leaked Claude Code source code https://www.youtube.com/...

• @theprimeagen @theprimeagen on x

  i cannot believe pee and poo are on the list of bad words....

• @valigo Valentin Ignatev on x

  ahahahahah claude code stopped subsidizing tokens but not in the way you think [image]

• @kimmonismus @kimmonismus on x

  tl;dr upcoming Anthropic models due to leak - Claude “Mythos”, Capybara tier already in version 2, it'll have a contextwindow of 1m - Mythos comes in “fast” and regular thinking - Opus 4.7 and Sonnet 4.8 already within the code - Claude “buddy” also found, but not clear what it i…

• @dariocpx @dariocpx on x

  Anthropic can kiss goodbye to any remote chance it had to IPO

• @intuitmachine Carlos E. Perez on x

  It's dumbfounding how Anthropic could accidentally release the source code of Claude Code.  Are they just moving too fast for anyone to really know what safeguards are in place?  Is the amount of code just too large that they can't even audit themselves for potential leaks?  WTF …

• @wesbos Wes Bos on x

  swearing at claude code logs your prompt as negative in their internal analytics continue, keep going, and go on all match for the agent to keep going [image]

• @wesbos Wes Bos on x

  Claude code generates random 4 character IDs Then they filter out 25 swears. Kenneth tried to tell them.. [image]

• @can @can on x

  curious what the arguments for keeping Claude Code closed-source are to begin with

• @boazbaraktcs Boaz Barak on x

  That's nothing! The codex source code has been leaked in full here! https://github.com/...

• @agustinlebron3 Agustin Lebron on x

  Well duh. It's pretty obvious Claude Code is largely vibecoded and no one is actually paying attention to users, systematically fixing bugs, looking at what works and doesn't work, improving the experience, etc. It's just spaghetti-at-the-wall 24/7. Welcome to AI SaaS in 2026.

• @kimmonismus @kimmonismus on x

  wtf, biggest leak of the year. This is absolute insane. Claude code source code leaked. That was NOT on my bingo card.

• @kimmonismus @kimmonismus on x

  HOLY, Claude Code CLI (≈500k+ lines), revealing its full agentic architecture, now on Github! [image]

• @netcapgirl Sophie on x

  running a production build and realizing you just leaked the claude code source code [image]

• @realsigridjin Sigrid Jin on x

  @Fried_rice folks, at 4am woke up to my phone blowing up with tons of notis my gf in korea worried get legal action by anthropic so did a feature port to python and pushed it so i wrote it all up using oh-my-codex @OpenAIDevs @bellman_ych try this one, look nice https://github.co…

• @karmedge Robert Lukoszko on x

  So last 7 days we had - npm leakage - mercor leak - liteLLM compromised - Claude code source code leaked - railway CDN problem - axios package also compromised - delve leaked their customer data

• @paoloanzn @paoloanzn on x

  so claude code's entire safety system for “dangerous” cyber security work is just...a text prompt literally replace it with an empty string and recompile. thats it. enjoy your unrestricted version [image]

• @rihardjarc Rihard Jarc on x

  People are bearish on memory, but the leaked Claude Code source code is showing us some additional memory demand that the market hasn't priced in IMO. 1. The market thinks about AI memory demand as a server-side story: HBM on H100s/B200s for inference. What the bug reports

• @banteg @banteg on x

  claude code uses axios btw. i think the “package managers are evil” guy was right. at this point it makes no sense to use anything but pinned or delayed deps. possibly even vendored.

• @valigo Valentin Ignatev on x

  Since it's confirmed that claude code is 90% vibe coded - you might want to switch to codex or something like that for a while, because it is pretty much guaranteed to have multiple 0-days that will be discovered now with these leaks. Even though it's supposed to only talk to

• @jumperz @jumperz on x

  dug through the leaked claude code source. 44 hidden feature flags. 20+ unshipped features... background agents, multi-agent orchestration, cron scheduling, voice mode, browser control. it's all built.. no wonder they releasing a new feature every 2 days.. everything already [ima…

• @mattpocockuk Matt Pocock on x

  Appears that a big chunk of Claude Code's source code has been exposed on npm via a .map file accidentally uploaded to the public registry. ~512K lines of code ~1,900 files HugOps to the Anthropic team, this is brutal https://github.com/...

• @angaisb_ Angel on x

  Mythos is so good at security that Claude Code source code got leaked

• @kloss_xyz Klöss on x

  Anthropic, the $380B company we all know to be shipping at historical rates, forgot basic CI hygiene and dropped a 59.8MB source map of their entire Claude Code in npm. The 3rd time this has happened btw... I imagine Dario will be DMCA'ing the mirrors by morning, and pretending […

• @cryptopunk7213 @cryptopunk7213 on x

  🚨this is nuts. anthropic's source code leaked unreleased features 👀 they're launching a virtual pet model (capybara 👀), agent creator wizard and more: 1. Buddy: unreleased virtual pet companion that sits on your terminal. 18 species (duck, goose, capybara, dragon), rarity

• @yampeleg Yam Peleg on x

  Just checked, this is an exact byte match to @𝚊𝚗𝚝𝚑 𝚛𝚘𝚙𝚒 𝚌-𝚊𝚒/𝚌 𝚕𝚊𝚞𝚍 𝚎-𝚌𝚘𝚍 𝚎@2.1.88 on npm. This is real.

• @t3chfalcon @t3chfalcon on x

  Huge Anthropic leak just dropped: the entire Claude Code CLI source is now public. A misconfigured .map file in their npm package exposed a direct download link to the full unobfuscated TypeScript codebase from Anthropic's own R2 bucket. Discovered by Chaofan Shou

• @21prnv Prnv Patil on x

  Instead of downloading and unzipping the whole codebase, here's a detailed, structured view of every file and folder so you can explore it like a product, not a zip dump: https://claude-code-info.vercel.app/

• @iruletheworldmo @iruletheworldmo on x

  wow claude code just got open sourced today is a big day.

• @k1rallik BuBbliK on x

  > Anthropic ships Claude Code as an npm package > someone runs ‘ls’ on the source map > entire codebase just sitting there. unobfuscated. > plugins, skills, tools, hooks, commands - everything > internal architecture of the most hyped AI coding agent, fully readable > Anthropic […

• @davidkpiano David K on x

  Ironically this is probably the first time that actual humans are carefully & thoroughly reviewing the Claude Code codebase

• @dhavalsingh7 @dhavalsingh7 on x

  I jumped on the hype train a bit too quickly, because omg I was a lil too excited & I love peeking behind the curtains and esp if its one of my favorite tools. But I genuinely feel for the CC team. They do work really hard. Bugs are inevitable. This was a really really bad

• @btibor91 Tibor Blaho on x

  “UNDERCOVER MODE - CRITICAL” [image]

• @kirat_tw Harkirat Singh on x

  claude code is officially open source.

• @icanvardar @icanvardar on x

  claude code uses axios 😭 [image]

• @tukifromkl Tuki on x

  🚨 Do you understand what just happened to Anthropic.. someone on their team ran a production build of Claude Code.. the compiler generated a .map file.. which is literally a blueprint that reverses the entire codebase back to its original source.. and then they published it [vide…

• @birdabo Sui on x

  JUST IN: Claude Code's full source code just leaked. hidden features found: > kairos - an unreleased autonomous daemon mode with background sessions and memory consolidation. always on agent. > buddy system - a full tamagotchi pet system. 18 species, rarity tiers, shiny [video]

• @panzer @panzer on x

  Remember when we griped new releases of products being a beta because nothing was finished on release well that is about to feel insanely quaint because everything is being deployed so fast no one has checked anything welcome to the yolosoft era

• @zephyr_z9 @zephyr_z9 on x

  why is everything getting leaked and hacked today

• @theo @theo on x

  Claude Code just got open sourced again!

• @edzitron.com Ed Zitron on bluesky

  Software engineers: how obvious a mistake did Anthropic make here with regards to how Claude Code's source code leaked?  Informal survey, I truly do not know  —  www.theregister.com/2026/03/31/ a...  [image]

• @carnage4life Dare Obasanjo on bluesky

  Wild to accidentally release the source code of your $2.5B ARR product, not once but twice in the past year.

• @markriedl Mark Riedl on bluesky

  Oh wow, Anthropic accidentally leaked Claude Code and it's been cloned and made public github.com/instructkr/c...

• r/technology r on reddit

  Anthropic accidentally exposes Claude Code source code

• r/technews r on reddit

  Entire Anthropic's Claude Code CLI source code leaks thanks to exposed map file |  512,000 lines of code that competitors and hobbyists will be studying for weeks.

• r/technology r on reddit

  Entire Claude Code CLI source code leaks thanks to exposed map file |  512,000 lines of code that competitors and hobbyists will be studying for weeks.

• r/pwnhub r on reddit

  Is claude code got leaked?

• @bcherny Boris Cherny on x

  @Dave_Does_AI @ns123abc Working around the clock to fix this. It's crazy to grow this fast, we're scaling up every service as quickly as possible. Thanks for bearing with us. Improvements landing daily and more on the way.

• @alexeheath Alex Heath on x

  A spokesperson told me today: “Earlier today, a Claude Code release included some internal source code. No sensitive customer data or credentials were involved or exposed. This was a release packaging issue caused by human error, not a security breach. We're rolling out measures

• @bcherny Boris Cherny on x

  @Rahatcodes 👋 This is one of the signals we use to figure out if people are having a good experience. We put it on a dashboard and call it the “fucks” chart

• @ns123abc Nik on x

  Claude code source code leak was a “human error” who would've thunk

• @altryne Alex Volkov on x

  Claude Code creator Boris Cherny does exactly what a company should be doing, calm, open replies about today's leak. Confirming that this wasn't an issue with @bunjavascript and was a ... developer error. Not AI agent, developer.

• @bcherny Boris Cherny on x

  @ns123abc 👋 it was human error. Our deploy process has a few manual steps, and we didn't do one of the steps correctly. We have landed a few improvements and are digging in to add more sanity checks. Like with any other incident, the counter-intuitive answer is to solve the probl…

• @ns123abc Nik on x

  Oh so that's why claude code source code got leaked. Now it all makes sense. [image]

• @ivanleomk Ivan Leo on x

  Did anthropic just decide to release claude code's entire source code since it got leaked lmao, their github repo is no longer private

• @bcherny Boris Cherny on x

  @wongmjane @BenLesh Mistakes happen. As a team, the important thing is to recognize it's never an individuals's fault — it's the process, the culture, or the infra. In this case, there was a manual deploy step that should have been better automated. Our team has made a few improv…

• @joshearle Josh on x

  is the human still with us?

• @yuchenj_uw Yuchen Jin on x

  I like how the Anthropic Claude Code team is being chill about the code leak. What's leaked is leaked. 70k forks, Python & Rust versions on GitHub, there's no way back. One thing is clear from reading the code: harness engineering is hard and deeply non-trivial. I think more

• @bcherny Boris Cherny on x

  @joshearle Yes, mistakes happen

• @bcherny Boris Cherny on x

  @stevekrouse 🫶I came up with the initial list, then a bunch of others contributed words also. This list has gone through many iterations!

• @bcherny Boris Cherny on x

  @itsolelehmann We're always experimenting with new ideas. 90% don't ship because we don't think they're good enough experiences. Still on the fence about this one — should we ship it?

• @theprimeagen @theprimeagen on x

  don't forget last time Anthropic, in their infinite PhD level wisdom, leaked their own source code (Feb 25) they DMCA'd all repos that had their code. Careful storing the code because Anthropic will have no mercy!

• @bcherny Boris Cherny on x

  @beeeeeeeegyoshi @stevekrouse Someone else asked for this but I think it's weird. You can add it to your thinking words via settings if you like, just ask Claude

• @bcherny Boris Cherny on x

  @JonathanKimXD @ns123abc No one was fired? It was an honest mistake, it happens

• @doublepulsar.com Kevin Beaumont on bluesky

  By human error do they mean ‘vibe coded using our own product error’ [embedded post]

• @markmadsen Mark Madsen on bluesky

  Using AI coding tools via an outside service is totally secure and we can all trust the vendors explicitly because they are experts and professionals.  [embedded post]

• @spavel Pavel on bluesky

  The vibe coded vibe coder.  You can now take a look for yourself how well the “our top engineers don't even write code anymore” company has fared.

• @metacurity.com Cynthia Brumfield on bluesky

  This combined with the Cisco source code theft equals a bad day for code security.  [embedded post]