Skills, MCP servers and plugins that work with Codex

An agent-harness optimization system covering skills, memory, security and research-first workflows for Claude Code and other agents.

Design skill that generates a UI/UX design system (style, palette, typography, layout pattern) for a project; installs as a Claude Code plugin or via CLI.

A /graphify skill and CLI that maps a codebase, docs and PDFs into a queryable knowledge graph; code parsing runs locally via tree-sitter, per its README.

Engineering workflow skills for AI coding agents covering spec, plan, build, test, review and ship, with matching slash commands.

Google's open-source AI agent that brings Gemini into the terminal.

Persistent memory across sessions: captures what an agent does and compresses it for later reuse.

A large curated list of MCP servers.

Design skill for coding agents with commands such as polish, bolder, critique and audit to steer and review frontend UI; installs via npx for Claude Code, Cursor, Codex and others.

OpenHands: an open-source platform for AI-driven software development.

HeyGen's open-source framework that renders HTML, CSS and seekable animations to MP4 video, with agent skills and a Claude Code plugin.

Reference repository of Claude Code practices for subagents, commands, skills, hooks, MCP, settings and memory, with example implementations.

Agent skill that draws diagrams as one self-contained HTML + SVG file across 45 diagram types; also installs as a Claude Code or Codex plugin.

Agent skill that rewrites AI-generated text to remove common AI-writing patterns, based on Wikipedia's Signs of AI writing guide.

A framework for orchestrating role-playing, autonomous AI agents.

Marketing skills for Claude Code and other agents: conversion optimization, copywriting, SEO, analytics and growth.

A library of agent skills for scientific research workflows.

Local MCP server that indexes a codebase into a knowledge graph for code search, call tracing and architecture queries; written in C.

A multi-harness plugin marketplace for Claude Code, Codex, Cursor, OpenCode, GitHub Copilot and others.

Microsoft's Playwright MCP server, which lets agents drive a browser.

Curated list of Agent Skills from vendor engineering teams and the community, with install paths for Claude Code, Codex, Cursor and other clients.

Web app, desktop app and MCP server for creating and editing draw.io diagrams by chatting with an AI model; exports .drawio, .png or .svg.

Large library of agent skills, agents and commands for engineering, marketing, product and operations, packaged for Claude Code, Codex, Gemini CLI and more.

Agent skill that keeps task_plan.md, findings.md and progress.md on disk and re-injects the plan via hooks so it survives /clear and compaction.

Product-management skills and commands packaged as 9 Claude Code plugins, from discovery to launch and growth; per its README, also installs in Codex.

Every's Compound Engineering plugin for Claude Code, Codex, Cursor and more.

MCP server giving AI assistants documentation, properties and operations for n8n workflow nodes, with optional workflow management via the n8n API.

Trail-code (formerly graft): local code index and team-learnings layer that gives Claude Code, Cursor, Codex and other agents codebase context; optional Trail workspace.

MCP server that gives an agent terminal command execution, process control, file search and diff-based file editing on your machine.

Open-source AI memory platform that turns documents and conversations into a searchable knowledge graph for agents.

A skills-based software development methodology for coding agents, installed as a plugin.

Agent skill that researches a topic across Reddit, X, YouTube, Hacker News, Polymarket, GitHub and the web from the last 30 days and summarizes it.

Local, browser-based review surface where you annotate coding-agent plans, specs and code diffs and send the feedback back to the agent via hooks.

Exa's MCP server for web search and crawling.

designlang: CLI that extracts a website's design system into DTCG tokens, Tailwind, Figma variables and more, with an MCP server for coding agents.

Claude Code plugin that runs several AI providers (Codex, Copilot, Ollama, Perplexity and others) on one task and flags where they disagree.

Open-source Kubernetes UI in one binary (topology, Helm, GitOps, traffic, audits) with a built-in MCP server that lets AI agents inspect clusters.

Frontend design skill that gives coding agents an art direction, credited open-archive images and a real-browser check; also a Claude Code and Codex plugin.

A meta-harness for Claude Code and Codex that orchestrates multi-agent swarms and workflows.

NVIDIA's security scanner for agent skills: static analysis plus optional LLM review for prompt injection, data exfiltration and other risks.

Google's open-source MCP server for databases, with prebuilt tools for MCP clients and a framework for building custom database tools.

GitHub's official MCP server for working with repositories, issues and pull requests from an agent.

ARIS: Markdown skills for autonomous ML research workflows (idea discovery, experiments, paper writing) with cross-model review; also ships plugins and a CLI.

Apify's MCP server that connects agents to Apify Store scrapers and crawlers for web and social data extraction.

OpenAI's lightweight coding agent that runs in your terminal.

The open agent skills CLI (npx skills) for installing and managing skills across coding agents.

MCP server and Claude Code plugin that sandboxes tool output to save context and keeps session history in SQLite; source-available under Elastic License 2.0.

An MCP toolkit that gives agents semantic code retrieval and editing.

Agent skills for drafting design specs with a context-holding agent and reviewing them with fresh subagents; per its README, not an official Google product.

GitHub CLI extension that compiles Markdown agentic workflows into GitHub Actions, running engines such as Copilot, Claude Code or Codex in sandboxed jobs.

Plugin of SEO, GEO, paid-ads and analytics workflow skills for Claude Code, Codex, Cursor and others; some workflows use a hosted NotFair MCP connection.

Agent skill and MCP server that lets coding agents edit video with local FFmpeg: 42 tools for cutting, captions, reframing, loudness and checks.

NVIDIA's catalog of Agent Skills for its software, including CUDA-X libraries, robotics, simulation and RAG workflows, mirrored from product repos.

Perplexity's MCP server for its API Platform, giving agents web search, reasoning and research tools; hosted remote or local.

Hook that blocks destructive Git and file-system commands and access to secrets before a coding agent runs a tool call; per its README, it is not a sandbox.

Six agent skills for AI code review of architecture, tech debt and tests, with findings cited to classic engineering books; works as a Claude Code plugin or Codex skill.

Five Claude Code skills for academic research, paper drafting, simulated peer review and revision, with human confirmation gates; licensed CC BY-NC 4.0.

The .NET team's curated agent skills and plugins for .NET and C#: builds, MSBuild, NuGet, diagnostics, upgrades, MAUI, data access and AI.

A hand-picked collection of Claude Code resources: workflows, commands, tools and more.

A CLI for analyzing coding-agent token usage and cost from local logs.

Semantic memory for coding agents, kept as Markdown files with a Milvus index; plugins for Claude Code, Codex, OpenCode and others, plus a CLI and Python API.

Hivemind by Activeloop: cloud-backed shared memory that turns agent session traces into reusable skills across Claude Code, Codex, Cursor and others.

Microsoft's local MCP server for Azure DevOps work items, repos, pipelines and wikis; the README recommends its hosted remote server.

Timescale's PostgreSQL docs search and best-practice skills for coding agents, offered as Agent Skills, a public MCP server and a Claude Code plugin.

Microsoft's agent plugin that bundles Azure skills with the Azure MCP Server and Foundry MCP, for GitHub Copilot, Claude Code and other hosts.

HashiCorp's Terraform MCP server for Terraform registry and workflow automation.

MongoDB's MCP server for connecting to MongoDB databases and Atlas clusters.

Self-hosted AI platform with an MCP gateway, private MCP registry, orchestrator, LLM proxy and guardrails; dual-licensed AGPL-3.0/enterprise, per its README.

Stripe's SDKs and tooling for building AI products on Stripe, including an MCP server.

1MCP: a unified MCP runtime that aggregates many MCP servers behind one endpoint, plus a CLI mode that lets agents discover and run tools progressively.

Claude Code plugin that sends the same question to several AI coding agents in parallel and summarizes where their answers agree and differ.

Auth0's MCP server for managing a tenant's apps, Actions, logs and users from an agent; beta software per its README.

Posit's Agent Skills for R and Python work: package development, Shiny, Quarto, Posit Connect deploys, code review and GitHub PR workflows.

A Claude Code guide covering workflows, hooks, skills and MCP servers, with templates and a stdio MCP server for querying it; guide licensed CC BY-SA 4.0.

Indexes past Claude Code, Codex, pi and Hermes sessions into durable searchable memory publishable on Hugging Face Hub.

A curated list of Claude Skills, resources and tools for customizing Claude workflows.

Skills catalog for Codex. The README marks this repository deprecated and points to the openai/plugins repository.