Write a back-cover blurb for an original manuscript
Two blurb drafts based on the supplied outline, within the stated spoiler limits.
Choose one of three approaches. The steps for that option appear below.
Choose an option above. On a phone, swipe the tabs left or right to see all options →
Claude: drafts two blurbs and taglines
Claude drafts two blurbs in different styles from your facts. You check every claim; it then offers taglines.
You
Write the blurb facts
Claude
Draft two blurbs
You
Check every claim
Claude
Draft three taglines
You
Read and choose
Write down the blurb facts
Use:You
Have ready: a short outline, the genre, readers and tone, and a spoiler list of what the blurb must not reveal.
Check
Check the outline is yours or cleared. Leave out anything you do not want shared.
Draft two blurbs
Use:Claude
Ask Claude for two blurbs in different styles, headed Blurb 1 and Blurb 2, using only your outline.
Details
What to paste into the tool
Task: two different back-cover blurbs for my manuscript. Write two different back-cover blurbs from the outline below. Use only the outline. Do not reveal anything on the spoiler list or the ending. If spoiler limits are not stated, ask for an approved opening-only outline before drafting. Do not invent praise, quotes, awards, sales figures or endorsements. Keep each blurb short and in the tone I give. Outline: [paste your outline]. Genre, readers and tone: [write them]. Spoiler list: [paste what must not be revealed].
Check every claim against your facts
Use:You
Check each sentence against the outline and the spoiler list.
Check
Check nothing on the spoiler list appears, even indirectly. Delete any praise, invented sales figures or unsupported claims.
Draft three taglines
Use:Claude
Ask Claude for three short taglines for the blurb you like, using only its content.
Details
What to paste into the tool
Task: three short taglines for one blurb. Write three short taglines for the blurb below. Use only its content. Do not reveal anything on the spoiler list, and do not add praise or claims. Blurb: [paste the chosen blurb]. Spoiler list: [paste the spoiler list].
Read everything once and choose
Use:You
Read the blurbs and taglines once more and choose.
Check
Check the spoiler list one more time. Nothing is published or sent. You choose.
ChatGPT: asks what is missing, then drafts
ChatGPT lists what your notes lack before drafting. You answer, then it drafts two blurbs from the updated notes.
You
Write numbered notes
ChatGPT
List what is missing
You
Answer the questions
ChatGPT
Draft two blurbs
You
Check and choose
Write short numbered notes
Use:You
Have ready: your cleared outline, genre, readers, tone and spoiler limits, as short numbered notes N1, N2...
Check
Check the outline is yours or cleared. Leave out anything you do not want shared.
List what is missing
Use:ChatGPT
Ask ChatGPT to list short questions about what is missing, such as the hook or the tone, with no blurb yet.
Details
What to paste into the tool
Where to work: paste your notes into a ChatGPT chat; you can add them as reference material in a project so the answers use what you added. Task: a list of short questions about what is missing from blurb notes, with no drafting. Read this outline for a back-cover blurb. List short questions about what is missing, such as the hook, the main character's aim or the tone. Do not write a blurb and do not ask me to reveal the ending. Outline and spoiler list: [paste your checked notes].
Answer each question or mark gaps
Use:You
Answer each question from what you know, or write 'not stated'.
Check
Do not guess to fill a gap.
Draft two blurbs from the notes
Use:ChatGPT
Ask ChatGPT for two blurbs, headed Blurb 1 and Blurb 2, written only from your updated notes.
Details
What to paste into the tool
Where to work: paste your updated notes into the same chat or project. Task: two different back-cover blurbs written only from my notes. Using only these notes, write two different blurbs. Do not reveal the ending or anything on the spoiler list. If spoiler limits are not stated, do not draft until the author supplies them or an approved opening-only outline. Do not invent praise, sales figures or endorsements. Notes: [paste your updated notes with the spoiler list].
Check each sentence and choose
Use:You
Check each sentence against the outline and spoiler list, then choose.
Check
Delete unsupported claims. Nothing is published or sent.
Claude: drafts, Grammarly polishes wording
Claude drafts two blurbs from your facts. You check every line against the spoiler list, then Grammarly suggests wording.
You
Gather facts and spoiler list
Claude
Draft two blurbs
You
Check against spoiler list
Grammarly
Suggest wording and tone
You
Read and choose
Gather facts and set spoiler limits
Use:You
Have ready: your cleared outline, genre, readers, tone and the spoiler list.
Check
Check the outline is yours or cleared. Leave out anything you do not want shared.
Draft two blurbs from your facts
Use:Claude
Ask Claude to draft two different blurbs only from your supplied material, with gaps marked PENDING.
Details
What to paste into the tool
Task: draft two different back-cover blurbs from the pasted facts only. Do not reveal any item on the spoiler list. Do not add praise, sales figures or endorsements. Mark anything missing as PENDING. Facts: [paste your facts]. Spoiler list: [paste your spoiler list]
Check both drafts against the list
Use:You
Check every sentence of both drafts against your outline and spoiler list; fix or hold anything wrong.
Check
Check every sentence against the outline and spoiler list. Reject spoilers, praise, sales figures or endorsements.
Suggest wording and tone changes
Use:Grammarly
Run the checked drafts through Grammarly for wording and tone suggestions; check spoiler and praise lines yourself.
Details
What to paste into the tool
How to use: paste one blurb into Grammarly and read each suggestion. Task: collect wording and tone suggestions without any rewrite. Review the suggestions on wording and tone; accept only the ones you agree with and make each change in your own copy. Do not accept any suggestion that adds praise, a sales figure or an endorsement. Then check these yourself, because wording and tone suggestions do not cover them: read each line against the spoiler list and the ending, and mark any line that may reveal too much or that contains praise, an endorsement or a sales figure, with a one-line reason. If none, write "none flagged". Blurb: [paste your blurb]. Spoiler list: [keep it beside you for your own check; do not rely on the tool to apply it]. Repeat for the second blurb.
Read it once more and choose
Use:You
Decide your edits, then read once more and choose.
Check
Change only what you agree with; keep your own voice. Check the spoiler list again. Nothing is published or sent.
Compare the three approaches
Option A: Claude: drafts two blurbs and taglines
Best when: You have a cleared outline and spoiler list
What it does: Claude drafts blurbs and taglines; you check claims
Strong at: Two styles in one step, so you can compare
Limit: A confident draft can smuggle in praise or a spoiler
Free plan: Yes, limited (usage caps)
Option B: ChatGPT: asks what is missing, then drafts
Best when: Your outline or spoiler limits are still rough
What it does: ChatGPT lists gaps, then drafts; you answer and check
Strong at: The prompt bars drafting before spoiler limits exist
Limit: Slower: questions and answers before any blurb
You check every sentence against the outline and confirm nothing on the spoiler list appears, even indirectly.
Any praise, invented sales figure or endorsement is deleted.
Nothing is sent, posted or published by an assistant; the author chooses.
Check the result against your original inputs. Approve it before sharing or acting.
Availability notes
Country availability for Claude, ChatGPT and Grammarly is not listed on the pages we checked (2026-10-27).
All three candidate tools show a free plan on official pages fetched 2026-10-28 (see option evidence); exact free-plan usage limits are not fully published.
What still needs checking
Whether the outline is the author's own or cleared can only be confirmed by the author.
If spoiler limits are not supplied they stay 'not stated' and only opening-only material may be used; the record cannot supply them.