prompt-engineering

Rules, labeled measured or prescribed, and workflows for writing text that LLMs read or act on - prompts and system prompts, skills, subagent and command definitions, worker briefs, tool and MCP descriptions, CLAUDE.md/AGENTS.md - and for shaping projects run mostly by coding agents, including cheap navigation of long files by outline and line range. Use when writing, improving or reviewing such text, when asking how to phrase an instruction so Claude follows it, why an agent ignores a rule, overtriggers, over-engineers or stops early, which model or effort a worker needs, or how to make a repository easier for agents; load it before answering so advice cites current Anthropic guidance and measured results instead of memory.