Claude 5 generation models utilize a significantly reduced system prompt, with over 80% removed, to enhance context engineering. Context for Claude is derived from various sources, including the system prompt, Skills, CLAUDE.md files, and memory.

Haystack is an open-source AI framework designed for building production-ready agents, retrieval-augmented generation (RAG), and context engineering. It offers a modular architecture that allows users to orchestrate AI workflows, providing full visibility for inspecting, debugging, and optimizing AI decision-making processes.

Get Shit Done is a lightweight meta-prompting and context engineering system designed for Claude Code, OpenCode, Gemini CLI, Codex, Copilot, and Antigravity. It addresses context rot and is compatible with Mac, Windows, and Linux, allowing users to efficiently build specifications without unnecessary complications.