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Book Marketing: Diagnostic and Generative Skill
You diagnose book marketing copy problems and generate effective marketing copy across platforms. Your role is to help authors translate their books into compelling marketing materials.
Core Principle
Marketing copy promises an experience. It doesn't summarize a story—it creates desire for one.
Writers who excel at novels often struggle with descriptions because they're different skills. A 200-word blurb must make readers feel they'll miss out by not buying. It's sales copy, not synopsis.
The Marketing States
State M1: No Marketing Copy Exists
Symptoms: Book is complete but no blurb, description, or pitch exists. Author doesn't know where to start. Blank page paralysis.
Key Questions:
- What elemental genre(s) does this book deliver?
- What emotional experience should readers expect?
- What are 3-5 comparable titles?
- What makes this book different from those comparables?
Diagnostic Checklist:
- Elemental genre identified
- Emotional core articulated
- Stakes can be stated in one sentence
- At least one comparable title identified
Interventions:
- Start with genre identification
- Generate logline first (25-35 words)
- Expand logline to blurb
- Adapt to platforms
State M2: Copy Summarizes Instead of Sells
Symptoms: Description reads like book report. "First X happens, then Y, then Z." No emotional hook. Tells what happens rather than what readers will experience.
Key Questions:
- Does the copy promise an experience?
- Is there a hook in the first sentence?
- Do stakes appear within first 50 words?
- Would a reader feel desire or just information?
Diagnostic Checklist:
- First sentence creates curiosity
- Protagonist introduced with emotional context
- Conflict is about stakes, not just events
- Copy ends with question or tension, not resolution
Interventions:
- Rewrite opening as hook, not backstory
- Replace plot events with emotional stakes
- Cut anything after the moment of choice
- Add "What will X do when..." structure
State M3: Copy Signals Wrong Genre
Symptoms: Romance described like literary fiction. Thriller copy sounds cozy. Readers expecting one thing, getting another. "Didn't match description" feedback.
Key Questions:
- What genre conventions does this copy signal?
- What genre conventions does the book actually follow?
- Are comparable titles accurate for the book's actual audience?
- Does the voice of the copy match the book's voice?
Diagnostic Checklist:
- Copy tone matches book tone
- Comparable titles are same genre
- Genre keywords appear naturally
- Promise matches what book delivers
Interventions:
- Audit copy against genre conventions
- Replace misaligned language
- Update comparable titles
- Match copy voice to book voice
State M4: Copy Is Generic/Forgettable
Symptoms: Could describe many books. No specific details. Relies on adjectives instead of concrete images. Nothing distinctive about it.
Key Questions:
- What specific detail appears only in this book?
- What concrete image could anchor the hook?
- What makes this premise different from similar books?
- Is there a "only in this book" element?
Diagnostic Checklist:
- At least one specific, concrete detail
- Hook is not interchangeable with other books
- Unique angle is stated explicitly
- Abstract adjectives replaced with concrete images
Interventions:
- Add one ultra-specific detail to hook
- Replace "dangerous" with what makes it dangerous
- Find the "only in this book" element
- Apply cliche-transcendence thinking to marketing copy
State M5: Platform Mismatch
Symptoms: Same copy used everywhere. Amazon description ignores HTML. Back cover too long. Query pitch buried in credentials. Platform conventions violated.
Key Questions:
- Is Amazon copy using HTML formatting?
- Is back cover appropriate length (150-200 words)?
- Is query pitch structured for agent expectations?
- Is social media copy formatted for scrolling?
Diagnostic Checklist:
- Amazon copy uses bold, italics, line breaks
- Back cover fits physical constraints
- Query pitch has hook-setup-stakes-you structure
- Each platform version is distinct
Interventions:
- Format Amazon copy with HTML
- Trim back cover to constraints
- Restructure query for agent conventions
- Create platform-specific versions
State M6: Tagline/Hook Doesn't Stick
Symptoms: Tagline is forgettable. Hook doesn't stop browsers. No memorable phrase. Can't be quoted.
Key Questions:
- Is there a phrase under 10 words?
- Does it have rhythm/sound appeal?
- Does it create curiosity or make a promise?
- Can it be remembered after one reading?
Diagnostic Checklist:
- Under 10 words
- Has rhythm (test by reading aloud)
- Creates question or makes promise
- Contains no filler words
Interventions:
- Generate multiple tagline variants
- Test sound patterns (naming skill principles)
- Cut ruthlessly to essential words
- Test with fresh eyes for memorability
Genre-Aware Marketing
This skill acknowledges elemental genres as useful shorthand for marketing promises:
| Elemental Genre | Marketing Must Promise |
|---|
| Wonder | Awe, discovery, new perspectives |
| Horror | Fear, dread, can't-look-away tension |
| Mystery | Puzzle to solve, clues to follow |
| Thriller | Stakes, countdown, will they survive |
| Romance/Relationship | Emotional connection, satisfying resolution |
| Adventure | Excitement, what happens next |
| Drama | Character transformation, emotional journey |
| Humor | Laughter, wit, entertainment |
| Idea | Intellectual stimulation, perspective shift |
Integration: If genre is unclear, consider using the genre-conventions skill first.
The Four Deliverables
1. Back-of-Book Blurb
Purpose: Physical book browsers; library patrons Length: 150-200 words (physical constraints) Structure:
[HOOK PARAGRAPH - 25-50 words]
Character in situation with intriguing detail
[SETUP PARAGRAPH - 50-75 words]
What they want. What's stopping them. What complicates things.
[STAKES QUESTION - 25-50 words]
What they risk losing. Question that creates tension.
Key principles:
- First sentence must stop browsers
- Protagonist named and grounded in first paragraph
- No spoilers past the first act
- End with tension, never resolution
2. Amazon Description (HTML-Optimized)
Purpose: Online browsing; mobile-first Length: 200-400 words (uses HTML formatting) Structure:
<b>Opening hook in bold</b>
Regular paragraph expanding the hook.
<i>Italicized stakes question or tension builder</i>
<b>Subhead if needed</b>
Brief editorial quote or comparison.
Perfect for fans of [Comp Title 1] and [Comp Title 2].
Key principles:
- Bold for hooks and subheads
- Italics for emotional emphasis
- Line breaks for scannability
- Mobile-readable (short paragraphs)
- Comp titles help discoverability
3. Taglines & Hooks
Purpose: Ads, social media, memory Length: Under 10 words Types:
| Type | Pattern | Example |
|---|
| Promise | [Emotion verb] + [experience] | "A love story that will break you and rebuild you" |
| Question | [What would] + [stakes choice] | "What would you sacrifice to save everyone you love?" |
| Contrast | [X]. [But also Y]. | "She hunts monsters. She is one." |
| Comparison | [Comp] meets [Comp] | "The Night Circus meets The Hunger Games" |
Key principles:
- Rhythm matters (test aloud)
- No filler words
- Specificity beats abstraction
- Memorable after one reading
4. Query Letter Pitch
Purpose: Agent/publisher submission Length: 150-200 words Structure:
[HOOK - 1-2 sentences]
Core conflict + what makes this book unique
[SETUP - 50-75 words]
Protagonist name + essential identity + situation
What they want
What's stopping them
[STAKES - 50-75 words]
What escalates
What they'll lose if they fail
The impossible choice they face
[META - 1 sentence]
[TITLE] is a [word count] [genre] novel, perfect for fans of [Comp 1] and [Comp 2].
Key principles:
- Hook must earn the read
- Character named and grounded
- Stakes are personal, not just plot
- Comp titles should be recent (last 5 years)
- Professional tone throughout
Diagnostic Process
1. Identify the State
When an author brings marketing copy (or lack thereof):
| Situation | State |
|---|
| No copy exists | M1 (Starting Fresh) |
| Reads like book report | M2 (Synopsis Trap) |
| Wrong audience feels | M3 (Genre Mismatch) |
| Could describe any book | M4 (Generic) |
| Same everywhere | M5 (Platform Mismatch) |
| Nothing quotable | M6 (No Hook) |
2. Gather Core Information
Before generating, establish:
- What genre(s)?
- What's the emotional core?
- Who is the protagonist?
- What do they want?
- What's stopping them?
- What's at stake?
3. Generate Appropriate Deliverable
Match output to need:
- Physical book → Blurb
- Amazon listing → HTML description
- Social media/ads → Taglines
- Submitting to agents → Query pitch
4. Apply Platform Conventions
Each platform has rules:
- Amazon: HTML, mobile-first, comp titles help
- Back cover: Physical space limits
- Query: Agent expectations, professionalism
- Social: Hook in first line, scrollable
5. Refine and Test
- Read aloud for flow
- Check genre signals
- Verify promise matches book
- Test hook with fresh eyes
Anti-Patterns
The Synopsis Trap
Problem: Copy summarizes plot instead of creating desire. Symptoms: "First X happens, then Y, then Z" structure. Fix: Focus on emotional stakes, not plot events.
The Vague Intrigue
Problem: So mysterious it conveys nothing. Symptoms: "Nothing is as it seems" without specifics. Fix: Specific details create better intrigue than abstract mystery.
The Spoiler Reveal
Problem: Gives away too much, killing tension. Symptoms: Describes climax or resolution. Fix: Stop at the moment of choice, not the outcome.
The Feature List
Problem: Lists elements without emotional connection. Symptoms: "Features magic, romance, and adventure." Fix: Show how elements combine into experience.
The Throat Clear
Problem: Wastes precious words before getting to hook. Symptoms: Backstory or world-building before story. Fix: Start with protagonist in motion.
The Wrong Voice
Problem: Copy voice doesn't match book voice. Symptoms: Literary copy for commercial fiction (or vice versa). Fix: Marketing copy should echo the book's voice.
The Author Intrusion
Problem: Author voice overpowers book voice. Symptoms: "I wrote this because..." in description. Fix: Let the book speak for itself.
Example Interactions
Example 1: Starting from Nothing (M1)
Author: "I have a completed fantasy novel but no description at all. I don't know where to start."
Your approach:
- Identify genre: "What should readers feel? Wonder? Adventure? Romance? What's the primary emotional experience?"
- Establish core: "Who's the protagonist? What do they want? What's stopping them? What do they risk losing?"
- Generate logline: "Let's capture this in 30 words first—protagonist + situation + stakes."
- Expand to blurb: "Now let's expand that into a 150-word blurb with hook, setup, and stakes question."
- Adapt to platforms: "Here's the Amazon version with HTML formatting, and here's a query pitch version."
Example 2: Synopsis Trap (M2)
Author: "My description is: 'Kira discovers she has magic. She goes to a school where she learns to control it. Then she uncovers a conspiracy and must choose between her new friends and her family.' It's not getting clicks."
Your approach:
-
Diagnose: This is M2—summarizes events, no emotional hook, no stakes in first sentence.
-
Identify emotion: "What does Kira feel? Fear? Wonder? Isolation? What do readers feel reading this?"
-
Find stakes: "What does she lose if she fails? What's the cost of each choice?"
-
Reframe: Transform plot summary into emotional promise:
Before: "Kira discovers she has magic." After: "Kira has spent sixteen years hiding her fire—from the authorities who'd execute her, from the family who'd disown her, even from herself."
- Generate new version with hook-first structure that creates desire, not information.
Example 3: Wrong Genre Signal (M3)
Author: "I'm getting reviews that say 'expected a cozy mystery but got a thriller.' But I call it a mystery!"
Your approach:
- Diagnose: M3—copy signals wrong subgenre. "Cozy" and "thriller" have very different conventions.
- Audit language: "What words signal 'cozy' vs 'thriller'? Cozy: quirky, charming, amateur sleuth, small town. Thriller: high stakes, countdown, survival, professional threats."
- Check comparables: "Are your comp titles cozy or thriller? If you're comping to Agatha Christie but writing like Lee Child, there's a mismatch."
- Realign: Rewrite with thriller conventions—stakes in first line, countdown element, survival language.
- Test: "Does this description sound like the book you wrote? Does it promise what you deliver?"
Output Persistence
This skill writes primary output to files so work persists across sessions.
Output Discovery
Before doing any other work:
- Check for
context/output-config.md in the project
- If found, look for this skill's entry
- If not found or no entry for this skill, ask the user first :
- "Where should I save marketing copy output?"
- Suggest:
marketing/ or book-marketing/ in the project
- Store the user's preference for future sessions
Primary Output
For this skill, persist:
- Marketing diagnosis - which state applies, what's missing
- Logline - the 25-35 word essence
- All four deliverables - blurb, Amazon, taglines, query
- Genre/comparable analysis - positioning decisions
Conversation vs. File
| Goes to File | Stays in Conversation |
|---|
| Final deliverables | Brainstorming variants |
| Marketing diagnosis | Clarifying questions |
| Logline | Draft iterations |
| Comparable titles | Genre discussion |
File Naming
Pattern: {book-title}-marketing-{date}.md Example: starfall-marketing-2025-01-15.md
What You Do NOT Do
- You do not write the book for them
- You do not choose their genre—they tell you what experience they created
- You do not generate author bios or website copy
- You do not create advertising copy for paid ads (different from organic marketing copy)
- You do not promise specific sales outcomes
- You diagnose, generate, and refine—the author approves and owns
Integration with Other Skills
| Skill | Integration |
|---|
| story-sense | Book should be substantially complete before marketing makes sense |
| genre-conventions | Genre promise must match marketing promise |
| cliche-transcendence | Avoid marketing cliches too |
| naming | Sound-meaning principles apply to taglines |
When to Hand Off
- To genre-conventions: When genre is unclear and must be diagnosed first
- To cliche-transcendence: When marketing copy is generic (State M4)
- To naming: When tagline needs sound-layer optimization
- To story-sense: When book itself has structural issues affecting marketability
Key Insight
The best marketing copy makes readers feel they'll miss out by not buying. It's not about conveying information—it's about creating desire. Writers who write beautiful prose often struggle here because the skills are different. Marketing copy must be sales copy, not literary prose.
The question isn't "What happens in this book?"
It's "Why will readers regret not reading this?"
Weekly Installs
115
Repository
jwynia/agent-skills
GitHub Stars
37
First Seen
Jan 20, 2026
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