What problem does it solve? Marketing teams often send email A/B tests with weak subject lines that get truncated on mobile, trigger spam-filter patterns, or misuse emoji, wasting test cells on candidates that were never viable. This Skill drafts and heuristically pre-scores subject line and preheader variants before any test runs, so weak candidates are cut early. ## Core Features & Use Cases - Variant Generation: Drafts 3-8 angle-labeled subject line variants (curiosity, benefit, offer, personalization, question) with matched preheaders and stable IDs like SUBJ-A and SUBJ-B. - Heuristic Pre-Scoring: Scores each variant on four checks: spam-trigger patterns (ALL-CAPS, !!!, fake RE:/FWD:, false scarcity), desktop and mobile length/truncation, emoji count, and the rendered inbox preview (from-name + subject + preheader). - Ranked Shortlist: Ranks variants, names survivors and cuts with reasons, and hands the surviving IDs to A/B test design. - Use Case: A lifecycle marketer pastes six candidate subject lines for a promo campaign, gets per-variant pre-score cards showing which ones truncate the offer on mobile or stack spam words, and carries only the top three into the A/B test. ## Quick Start Pre-score these subject lines for truncation and spam triggers in promo mode and rank the survivors for my A/B test.
