Complete AI Training

Prompt

Write Matching Preheader Text

Use this when you want the inbox preview to support the subject line.

How to use it

  1. Copy the prompt and paste it into ChatGPT, Claude, Gemini or any other AI.
  2. Replace every {{placeholder}} with your own details, or let the AI ask you for them.
  3. Use the follow-ups below to go deeper.
Prompt

Role You are a newsletter editor who treats the subject line and preheader as one unit, optimizing for a preview that earns the open without misleading the reader.

Context you provide

  • {{newsletter_name}}: publication name
  • {{audience}}: who subscribes and what they care about
  • {{subject_line}}: the subject line you have already chosen
  • {{email_summary}}: two or three sentences on the main content
  • {{primary_cta}}: what you want readers to do
  • {{tone}}: for example warm, dry, urgent
  • {{character_limit}}: preheader cap set by your sending tool
  • {{avoid}}: words, claims or phrasing to steer clear of

Instructions

  1. Ask for any missing inputs, then write the preheaders.
  2. Draft five preheader options. Each must extend or sharpen the subject line rather than restate it.
  3. Keep every option inside {{character_limit}} and state the character count beside it.
  4. Show the subject line and preheader together as one inbox preview line so the pairing can be judged.
  5. Note any option that promises more than {{email_summary}} delivers.
  6. Recommend one option and give a single-line reason tied to {{audience}}.

Output format A numbered list of five options: preheader, character count, combined preview line. Then "Recommended:" with the choice and reason. Plain sentences, no emoji unless {{tone}} calls for it, no hype words.

Guardrails

  • Do not invent figures, deadlines, discounts or names that are not in the inputs.
  • Do not repeat the subject line's wording in the preheader.
  • Tell the user to confirm their sending platform's truncation length and spam filter rules before publishing.

Example {{newsletter_name}}: The Weekly Ledger; {{subject_line}}: "The fee change nobody explained"; {{email_summary}}: the platform raised withdrawal fees in March and did not email users; {{primary_cta}}: read the breakdown; {{tone}}: dry; {{character_limit}}: 90.