Anthropic ORG

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Access to Anthropic's safety-first language model APIs via Go

Homebrew formulae for Anthropic tools.

Access to Anthropic's safety-first language model APIs in TypeScript

Access to Anthropic's safety-first language model APIs in C#

The CLI for the Claude API

Access to Anthropic's safety-first language model APIs in PHP

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Official, Anthropic-managed directory of high quality Claude Code Plugins.

Open source repository of plugins primarily intended for knowledge workers to use in Claude Cowork

Rust implementation of protobuf with editions support, JSON serialization, and zero-copy views

This repo is a mirror of the contents of base-action in https://github.com/anthropics/claude-code-action.

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Claude Code is an agentic coding tool that lives in your terminal, understands your codebase, and helps you code faster by executing routine tasks, explaining complex code, and handling git workflows - all through natural language commands.

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A collection of notebooks/recipes showcasing some fun and effective ways of using Claude.

Community plugin marketplace for Claude Cowork and Claude Code. Read-only mirror — submit plugins at clau.de/plugin-directory-submission.

An implementation of the ConnectRPC protocol for Rust

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A suite of plugins for legal workflows

Skills for threat modeling, scanning, triage, patching, plus an autonomous scanning harness you can /customize

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A Nix plugin that resolves Cargo workspaces natively and allows for crate level builds

Public repository for Agent Skills

Benchmark for evaluating LLM agents on smart-contract vulnerability discovery and exploitation

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HTML effectiveness examples

A collection of projects designed to help developers quickly get started with building deployable applications using the Claude API

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Repo for the Claude Code Marketplace to use with the Claude for Life Sciences Launch. This will continue to host the marketplace.json long-term, but not the actual MCP servers.

A Swift package for parsing, building, editing, and analyzing Markdown documents.

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A runtime for writing reliable asynchronous applications with Rust. Provides I/O, networking, scheduling, timers, ...

Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy

Head Vis Public Release

Reference and an example for the Bluetooth API for makers in Claude Cowork & Claude Code Desktop

Declarative Continuous Deployment for Kubernetes

Terragrunt is a flexible orchestration tool that allows Infrastructure as Code written in OpenTofu/Terraform to scale.

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Claude Code SDK Demos

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Anthropic's Interactive Prompt Engineering Tutorial

An AI-powered security review GitHub Action using Claude to analyze code changes for security vulnerabilities.

Report issues related to MCP integration with Claude here.

Claude Opus 4.6 wrote a dependency-free C compiler in Rust, with backends targeting x86 (64- and 32-bit), ARM, and RISC-V, capable of compiling a booting Linux kernel.

Apache Beam is a unified programming model for Batch and Streaming data processing.

The foundational document describing Claude's values and behavior

Anthropic's original performance take-home, now open for you to try!

Maestro: Netflix’s Workflow Orchestrator

Parallel nix evaluator with a streamable json output [maintainers @Mic92, @adisbladis]

Hypercorn is an ASGI and WSGI Server based on Hyper libraries and inspired by Gunicorn.

Chrome extension showing helpful troubleshooting when Tailscale .local domains fail to resolve

Anthropic Dev Container Features, including Claude Code CLI

A minimal HTTP client. ⚙️

GitHub's official MCP Server

Supplementary materials for Claude Model Cards

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Anthropic's educational courses

This repo contains detailed implementation information about Anthropic's paired prompts approach for evaluating political neutrality.

"rsync for cloud storage" - Google Drive, S3, Dropbox, Backblaze B2, One Drive, Swift, Hubic, Wasabi, Google Cloud Storage, Azure Blob, Azure Files, Yandex Files

Type annotations and dynamic checking for a tensor's shape, dtype, names, etc.

Development repository for the Triton language and compiler

Like Python's faulthandler module, but also prints the C call stack

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Human preference data for "Training a Helpful and Harmless Assistant with Reinforcement Learning from Human Feedback"

https://transformer-circuits.pub/2025/attribution-graphs/methods.html

Display and customize Markdown text in SwiftUI

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Lightweight demo using the Anthropic Python SDK to experiment with Claude's Search and Retrieval capabilities over a variety of knowledge bases (Elasticsearch, vector databases, web search, and Wikipedia).

Contains random samples referenced in the paper "Sleeper Agents: Training Robustly Deceptive LLMs that Persist Through Safety Training".

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Serialization library for Exceptions and Tracebacks.

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Notebooks accompanying Anthropic's "Toy Models of Superposition" paper

A library for bridging Python and HTML/Javascript (via Svelte) for creating interactive visualizations