Open-Source Directory — Claude / Anthropic

Claude
Tools

A curated index of extensions, plugins, MCP servers, hooks, and integrations for Claude — discovered from GitHub and refreshed daily.

Repository Growth — Last 30 Days

8240entries
★ starsA–Z name

claude-code-auto-authorize

1
@danbuhler

Chrome extension that auto-clicks the Authorize button on Claude Code OAuth pages

updated Jul 2026

claude-code-course

1
@Bharathi-vbr

Hands-on Claude Code course project — CLI chat assistant with MCP server/client integration, tool use, and document management using the Anthropic API.

updated Apr 2026

agent-estimation-skill

1
@adrozdenko

Claude Code skill: estimate agent work in tool-call rounds, not human hours

updated Apr 2026

chem-agent

1
@jincinga24-hue

Autonomous chemical engineering agent: LLM tool-use over RDKit, Antoine thermo, Python+scipy, arxiv literature. 23-problem benchmark across 10 ChemE subdomains.

updated Jun 2026

Engram-Memory-OS-for-Claude-Code

1
@Abhion24

⚡ Persistent Memory OS for Claude Code — Auto-indexes codebases, records session decisions, and injects relevant context automatically. Zero-config VS Code extension + React dashboard.

updated Apr 2026

cadence

1
@eliasadamshk

Live standup automation. Cadence joins the call, follows the conversation, and syncs your tools as decisions are made.

updated Apr 2026

skill-harness

1
@blinnieinfertile577

Bootstrap the 45ck agent stack with shared skills, Claude and Codex agents, project tooling, and embedded packs

updated Jul 2026

Anthropic-Readlist-Tracker

1
@YuriNek0

Personal Tools for tracking Anthropic Courses and Claude Cookbooks.

updated Jul 2026

video-extract-agents

1
@cibis

AI-powered video extraction platform - CrewAI agents, MCP/SSE tools, Claude (Anthropic), AWS Bedrock, Angular, Node.js, Python, FFmpeg, Azure Container Apps

updated May 2026

LangValidator

1
@ahmedbutt2015

Self validating LangGraph agent pipeline: every agent output passes through a checkpoint node that scores it and routes to pass, retry with feedback, or halt. Includes rule based, LLM as judge, and semantic validators plus MCP-style fact-check and schema-check tools.

updated Apr 2026

hermes

1
@polleoai

Claude chat for Obsidian — read and edit vault files, run tools via the Anthropic API.

updated Apr 2026

claude-data-reporter

1
@ps-cmd777

AI-powered CSV analysis CLI. Claude tool-use API generates statistical insights, charts, and Markdown reports from any CSV.

updated Jul 2026

AI_Code_Explainer

1
@Geetanjali1310

AI-powered CLI tool that analyzes Python files and explains every function in plain English using the Anthropic Claude API. Built with Python, Click, and Streamlit.

updated Apr 2026

CommentStyler-AI

1
@RylanHexx

A Visual Studio Code extension made for Vibe Coders so that they can easily understand all the giberish AI models put in their code.

updated May 2026

claude-code-context-tracker

1
@louispfeiffer

Status line extension for Claude Code showing context usage with proactive hints

updated Apr 2026

omnifocus-mcp

1
@uthark

MCP for Omnifocus

updated Jun 2026

skill-vault

1
@Synchronic-leafbud824

Organize, secure, and find Claude Code skills in one vault for easy reuse

updated Jul 2026

clinical-trial-design

1
@wei-ai-lab

Claude Code plugin & MCP server for Phase 2/3 clinical trial design. 9 tools: single-primary (binary/continuous/PH+NPH survival), multi-hypothesis (co-primary, multi-population, Maurer-Bretz). Backed by gsDesign, gsDesign2, graphicalMCP. Word/PDF reporting, Monte-Carlo verification, 176-case benchmark corpus.

updated Jun 2026

claude-skill-check-vscode

1
@MukundaKatta

VS Code extension that lints Claude Code SKILL.md files inline. Editor companion to the claude-skill-check PyPI package.

updated Jun 2026

ai-agents

1
@Claws-ZH

AI agent fleet — devops, finance, media, office, social. Shared Anthropic Claude API loop, domain-specific tools.

updated Apr 2026

ClaudeCost

1
@kindcasper

VSCode extension + Claude Code hook to track API spending in the status bar

updated Jun 2026

kainclaw

1
@cain0501

Open-source desktop AI agent client with MCP, tools, multi-provider support, design workflows, and image workflows.

updated Jul 2026

awesome-claude-universe

1
@Najeebullah3124

Curated monorepo: 70+ Claude Code, MCP, skills & tooling snapshots + MANIFEST. For R&D and discovery

updated Apr 2026

MCP-Chatbot

1
@thevaginazz

CLI-based MCP chatbot built with FastMCP Python SDK and Anthropic Claude API. Includes custom document read/write tools using Model Context Protocol architecture.

updated Jul 2026
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