Turn a rough natural-language ask into a high-quality, Anthropic-spec prompt. Use when the user wants to write, engineer, improve, tighten, or harden a prompt — "write me a prompt for X", "make this prompt better", "rewrite my prompt to spec", "engineer this prompt", "prompt for <task>", or /prompt. ALWAYS reads references/anthropic-prompt-engineering.md (the codified current Anthropic guidance) before writing, instead of relying on memory of prompt-engineering folklore (now partly stale — e.g. prefill is deprecated, budget_tokens → adaptive thinking).
