Spec Kit
Open-source scaffold from GitHub that operationalizes spec-driven development with AI coding agents. Creates structured .specify/ folders that serve as the source of truth for Claude Code, GitHub Copilot, and Gemini CLI — steering AI generation from upfront specs rather than improvised prompts.
GitHub MCP
Official GitHub MCP server exposing repos, PRs, issues, and code search to AI agents. Enables agentic workflows that read and write to GitHub.