The missing app store for GitHub Copilot

What it does

This repository is a curated catalog of community-submitted customizations for GitHub Copilot. It indexes specialized agents, file-pattern instructions, self-contained skills, session hooks, curated plugins, and markdown-driven GitHub Actions workflows. The goal is to give Copilot domain-specific guardrails and behaviors beyond its default training.

The interesting bit

The project treats Copilot less like a static autocomplete engine and more like an operating system that needs applications. The llms.txt file is a particularly clever meta-layer: it exposes the entire catalog in a machine-readable format so other AI agents can browse and consume it.

Key highlights

• Seven resource types: agents, instructions, skills, plugins, hooks, agentic workflows, and a cookbook for Copilot APIs
• Companion website with full-text search, a Learning Hub, and a Tools section for MCP servers
• Machine-readable llms.txt available for AI agent consumption
• Marketplace integration allows direct plugin installation from the Copilot CLI/VS Code
• All listings are community-contributed and third-party sourced

Caveats

• The README explicitly warns that all customizations are sourced from third-party developers and must be inspected before installing

Verdict

Worth exploring if you are trying to coax Copilot into behaving like a domain expert rather than a generalist. Skip it if you prefer your AI assistant without configuration overhead or third-party extensions.