Claude Code plugins, marketplaces and harnesses

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

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

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

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.

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

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

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.

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.

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

A CLI tool for configuring and monitoring Claude Code, with a library of templates.

GitHub's toolkit for spec-driven development with coding agents.

GitHub's community-contributed collection of Copilot custom agents, instructions, skills, hooks and plugins, also usable as a Copilot plugin marketplace.

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

An Anthropic-managed directory of Claude Code plugins.

Microsoft's plugin marketplace for GitHub Copilot and Claude Code with Power Platform skills: Power Pages, model-driven and canvas apps, PCF, Power Automate.

A Claude Code plugin that distills skills from real sessions, merges duplicates, and prunes unused ones.

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

A configuration framework that adds commands, personas and methodologies to Claude Code.