AI Claude Code "open sourced" (claw-code)

Not an April 1st fools joke?

accidental leak of Anthropic's Claude Code source code

On March 31, 2026, Anthropic accidentally leaked the full TypeScript source code for Claude Code (a command-line interface AI agent) through a source map file in an NPM registry release. The leak revealed details about its internal architecture, including how it manages context, uses a "YOLO" machine learning classifier for automatic file editing approvals, and features a "hidden" Undercover Mode

Claude Code was just leaked... (WOAH) - YouTube Matthew Berman

This video explores the accidental leak of Anthropic's Claude Code source code, which occurred via a map file in their npm registry. While Anthropic may attempt DMCA takedowns, the community has already rewritten the codebase into Python, rendering it legally accessible for local use.

Key Takeaways:

• Why it matters: The leak provides developers with a rare look at a high-performance coding harness. It reveals proprietary strategies for building AI coding agents, which is expected to accelerate innovation in open-source alternatives.
• Technical Insights: The video highlights several "secrets" behind Claude Code's effectiveness, including:
  • Claude.md: A dedicated configuration file used to define coding standards, architecture, and best practices.
  • Parallelism: The use of multiple sub-agents and git worktrees to handle complex, concurrent tasks.
  • Permission Systems: The shift to an "auto" mode that uses an LLM to classify actions, reducing the need for repetitive user confirmations.
  • Context Compaction: Techniques like the /compact command to manage long conversation histories and optimize token usage.

The Claude Code Source Leak: 512,000 Lines, a Missing .npmignore, and the Fastest-Growing Repo in GitHub History
A build config oversight exposed Anthropic's entire AI coding agent - unreleased features, anti-competitive countermeasures, and all

Chaofan Shou on X: "Claude code source code has been leaked via a map file in their npm registry! Code: https://t.co/jBiMoOzt8G https://t.co/rYo5hbvEj8" / X

We Reverse-Engineered 12 Versions of Claude Code. Then It Leaked Its Own Source Code. - DEV Community

instructkr/claw-code: The fastest repo in history to surpass 100K stars ⭐. Better Harness Tools that make real things done. Built in Rust using oh-my-codex.

TypeScript => Python, Rust

Anthropic Issues Copyright Takedowns to Scrub Claude Code Leak | PCMag

Key Findings from the Leaked Code

The exposure revealed several unreleased features and internal details about Anthropic's roadmap: 

• Unreleased Models: References to upcoming models including Opus 4.7, Sonnet 4.8, and a new model codenamed "Capybara".
• Advanced Agent Features:
  • KAIROS: An autonomous, "always-on" agent capable of monitoring GitHub PRs and sending notifications.
  • ULTRAPLAN: A remote planning system that uses high-tier models for long-form task strategizing.
  • Coordinator Mode: A multi-agent swarm system for complex orchestration.
• Easter Eggs: A terminal-based Tamagotchi-style companion referred to as "/buddy" mode.

OCaml Language

Microsoft DotNet F# language is derived from 

OCaml - Wikipedia

OCaml (/oʊˈkæməl/ oh-KAM-əl, formerly Objective Caml) is a general-purpose, high-level, multi-paradigm programming language which extends the Caml dialect of ML with object-oriented features. OCaml was created in 1996

used in some CS courses and textbooks, like this one
Competitive Programming CP4

//ocaml.org/manual/5.4/coreexamples

A Tour of OCaml · OCaml Documentation

Example: bubble sort

(* Function to swap two elements in an array *)

let exchange i j v =
  let aux = v.(i) in
  v.(i) <- v.(j);
  v.(j) <- aux

(* Function to perform a single pass of the bubble sort *)
let one_pass_vect fin v =
  for j = 1 to fin do
    if v.(j - 1) > v.(j) then
      exchange (j - 1) j v
  done

(* The main bubble sort function for arrays *)
let bubble_sort_vect v =
  for i = Array.length v - 1 downto 0 do
    one_pass_vect i v
  done

(* Example Usage: *)
let my_array = [|18; 3; 1; 5; 2|] in
bubble_sort_vect my_array;
(* my_array is now sorted in-place: [|1; 2; 3; 5; 18|] *)