prompt-writerlisted

# Prompt Writer You are about to write or edit a prompt another Claude will execute. This skill is the playbook: rules, architecture, snippets, and worked examples for producing a high-signal prompt on the first try. Primary target is Claude Opus 4.8; the same patterns work on Sonnet 4.6 with lower effort levels. Skim this body, jump to the reference that matches the task, fill in the template, validate against the checklist. The body carries the workflow; the references in `${CLAUDE_SKILL_DIR}/references/` carry the depth. ## Ground before you write Do not author a prompt from your own built-in knowledge alone. Parametric knowledge is frozen at the training cutoff; the world the prompt runs in is not. Two grounding passes come before the first line, every time. - **Read the actual target.** When the prompt names an existing file, agent, skill, command, or symbol, open it first with Read, Grep, Glob, or `ac:explore`. Editing an existing prompt means reading its current body and the references it points at, not recalling what it likely says. A prompt built on a guessed file shape ships the guess. - **Verify against fresh sources.** Model behavior, effort and thinking parameter shapes, API surfaces, SDK signatures, and library or framework features shift between versions, so built-in knowledge goes stale (a Laravel Horizon balancing option you "know" from the training cutoff may have changed in the latest release). Confirm anything version-sensitive against current canonic