Anthropic accidentally leaked the entire source code of Claude Code, due to a human error in one of their processes. Revealing the tool’s full architecture, internal prompts, agent workflows, tool usage, permission systems, and unreleased/hidden features. Boris, the lead for Claude Code, confirmed that this was a developer error, not any bug in Bun or a hack.

Re unreleased/hidden features (because I know you wanna know); “Proactive” mode (AI works autonomously without prompts), frustration/anger detection via keyword patterns is marked ‘negative’ in their analytics, a Tamagotchi-like “/buddy” companion, background daemons (like OpenClaw uses), undercover commit-hiding mode, and more feature flags/roadmap items.

The community ran rampant cloning the codebase on GitHub (which Anthropic since sent DMCA notices to get them taken down). But some developers ported the code to other languages (Python and then Rust) - which has copyright greyness and if Anthropic push to get them removed, may bring up questions on their own copyright issues.

Since it was April Fools yesterday, many launches are indistinguishable from real ones - I think it’s getting harder to spot in the AI age too.

But some folks use it as an opportunity to launch things, like Gumroad replacing their CEO with an AI Agent. Sahil (the founder) is a friend and previously invested in my last company. He’s super smart and I don’t think this is a prank at all. He’s the kind of person to try wacky, out-there things to see if they stick.

Some companies actually do April Fools well, like ElevenLabs. Last year, they made dogs talk, and this year, they are partnering with the 3000-year-old ElvenLabs.

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Headlines

• Claude Code now renders a full UI in your terminal to solve the flickering. It shows “N new messages” when you scroll up, gives you full mouse support, and constant memory use. It’s experimental for now; upgrade to the latest version and run using “CLAUDE_CODE_NO_FLICKER=1 claude”.

• OpenAI closed its $122B raise at a $852B post-money valuation. It’s making about $2B a month in revenue, 40% of which comes from the enterprise. The blog post outlines a lot of their plans that were previously just rumours/leaks from various newsrooms.

• Slack is turning Slackbot into a desktop companion. Select anything on your screen, pass it to Slackbot, and it can answer based on the context from your Slack workspace. It has 30+ new capabilities, including meeting transcription, reusable AI skills, MCP client and a native CRM.

• Softr AI builds the tool your business needs, not a prototype. It wires the whole thing: database, logic, logins, permissions, & security (even hosting) with a visual editor to fine-tune. Think client portals, internal tools, CRMs, and more. No code required. 👉 Start today with 200 free AI credits.*

My feed

• Attio - The AI CRM that does the work for you.*

• AgentOS by Rivet.dev - open-source operating system for agents. ~6 ms coldstarts, 32x cheaper than sandboxes.

• Mario, the founder of Pi, asked around for something like Google Docs, but for markdown. He then vibed Jot in an hour.

• Your agents can now access Supabase’s full documentation as a virtual filesystem. I think Mintlify could offer this to their customers, similar to how they added the “Copy as Markdown” button to the docs hosted via Mintlify.

• Vibe coding SwiftUI apps is a lot of fun.

• Simple Mac app to run skills on a schedule via Claude Code.

• Exa’s new product, Monitors, returns fresh results from the web for your query on schedule. Feels relevant for building agents.

  • Yutori’s Scouts do something similar for humans. They also launched Yutori’s desktop app for local-only access to logged-in websites when creating these “what’s new for your query” reports.

• The case against personal software.

• Cloudflare launched a successor to WordPress with a focus on plugin security.

• How Zapier measures the AI fluency of every hire across all departments.

• Block wants to move away from traditional human hierarchies and transition to one guided by an intelligence layer.

• Microsoft is working towards adding OpenClaw-style personal agents to M365.

Afters

Colossus @colossusmag We're publishing an exclusive chapter from @scmallaby 's brilliant new book about Demis Hassabis and DeepMind. This is the inside story of Project Mario. How DeepMind's co-founders spent 4 years trying every mechanism they could think of to put guardrails around AGI, only to 10:00 AM · Mar 31, 2026 · 857K Views 22 Replies · 159 Reposts · 1.24K Likes

fredrika @fredrikalindh reviewing in cursor is now a much better experience than github - select diff and ask cursor why it's there (or to fix) - view videos/images of result - test straight from browser we also added mark as viewed, link to preview and many more improvements coming 5:52 PM · Apr 1, 2026 · 36.7K Views 15 Replies · 21 Reposts · 397 Likes

shadcn @shadcn Introducing Luma, a new shadcn/ui style. Rounded geometry. Soft elevation. Breathable layouts. Inspired by macOS Tahoe (minus the glass). Foundation. For your next app. 6:36 PM · Mar 31, 2026 · 303K Views 245 Replies · 273 Reposts · 6.99K Likes

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