To elevate AI performance, create a structured folder system it can reference. This 'operating system' should include folders for persistent knowledge (e.g., `/knowledge`, `/people`), and active work (`/projects`). Providing this rich, organized context allows the AI to generate highly relevant, non-generic outputs.

Structure AI context into three layers: a short global file for universal preferences, project-specific files for domain rules, and an indexed library of modular context files (e.g., business details) that the AI only loads when relevant, preventing context window bloat.

Putting all instructions in a single `claude.md` file is inefficient. Instead, use the main file to act as a router, containing only high-level instructions on where to find specific knowledge (e.g., in `marketing_rules.md`). This keeps prompts efficient and scalable.

Go beyond single-chat prompting by using features like Claude's "Projects." This bakes in context like brand guidelines and SOPs, creating an AI "second brain" that acts as a strategic partner, eliminating the need to start from scratch with each new task.

Go beyond using Claude Projects for just knowledge retrieval. A power-user technique is to load them with detailed, sequential instructions on how specific MCP tools should be used in a workflow, dramatically improving the agent's reliability and output quality.

The easiest way to teach Claude Code is to instruct it: "Don't make this mistake again; add this to `claude.md`." Since this file is always included in the prompt context, it acts as a permanent, evolving set of instructions and guardrails for the AI.

To build a robust personal OS in Claude Code, replicate OpenClaw's architecture. Use a master instruction file (e.g., `claude.md`) that systematically imports context from separate files for identity, user info, and a comprehensive tools list (`tools.md`).

To get consistent, high-quality results from AI coding assistants, define reusable instructions in dedicated files (e.g., `prd.md`) within your repository. This "agent briefing" file can be referenced in prompts, ensuring all generated assets adhere to a predefined structure and style.

Notion's team uses a `claude.md` file in their repo root to provide global instructions (e.g., tech stack) to their AI assistant. A git-ignored `claude.local.md` file is then used by each developer to provide personal context, like their username, which prevents the AI from modifying others' work.