Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/ckokoski/authoragent/first-chapter-hooknpx skills add Ckokoski/AuthorAgent --skill first-chapter-hookgit clone --depth 1 https://github.com/Ckokoski/AuthorAgentWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00019 | $0.01292 |
| Opus 5 | $0.00010 | $0.00646 |
| Sonnet 5 | $0.00004 | $0.00258 |
| Haiku 4.5 | $0.00002 | $0.00129 |
Grade A, and why
first-chapter-hook scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.
First Chapter Hook — Premium Skill
Analyze, score, and rewrite your first chapter to maximize reader retention. Because if your first page doesn't hook them, they never see page two.
Hook Score Analysis
Paste your first chapter and get a detailed hook assessment:
First Chapter Hook Score: "The Silent Hour" — Chapter 1
Overall Hook Score: 72/100
╔══════════════════════════════════════════════════╗
║ OPENING LINE ★★★★☆ 8/10 ║
║ First 250 Words (Look Inside) ★★★☆☆ 6/10 ║
║ Inciting Disturbance (first 3 pages) ★★★★☆ 7/10 ║
║ Character Investment (by page 5) ★★★★☆ 8/10 ║
║ Question Engine (unanswered hooks) ★★★☆☆ 6/10 ║
║ Pacing Momentum ★★★★☆ 7/10 ║
║ Voice Distinctiveness ★★★★★ 9/10 ║
║ Genre Promise (signals correct genre) ★★★★☆ 8/10 ║
║ Last Line Pull (chapter-end hook) ★★★☆☆ 6/10 ║
║ DNF Risk Assessment ★★★★☆ LOW ║
╚══════════════════════════════════════════════════╝
Strengths:
✅ Strong voice — reader knows who's telling this story
✅ Character is immediately sympathetic (dog detail works)
✅ Genre promise is clear by paragraph 3
Weaknesses:
⚠️ First 250 words spend too long on setting — Amazon "Look Inside" readers will bounce
⚠️ The inciting disturbance doesn't land until page 4 — move to page 1-2
⚠️ Chapter ends on a soft note — needs a question or revelation to pull into Ch2
⚠️ Only 2 unanswered questions planted — aim for 4-5 micro-hooks
Genre Hook Templates
Analyze your opening against genre-specific reader expectations:
Supported Genres
- Thriller/Suspense — Danger-first openings, ticking clock, in medias res
- Romance — Meet-cute or emotional wound, voice-heavy, chemistry signal
- Fantasy — World-hook (one fascinating detail), character-in-motion, magic tease
- Mystery — Crime or anomaly, detective intro, red herring plant
- Sci-Fi — World displacement, technology-as-character, status quo disruption
- Literary Fiction — Voice showcase, thematic seed, emotional resonance
- Horror — Normalcy with wrongness, dread buildup, false safety
- YA — Voice-first, identity conflict, immediate stakes
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 141 lines · 19 tokens per session scan A 862ee899be1f
first-chapter-hook is a skill published in the GitHub repository Ckokoski/AuthorAgent (102 stars, last pushed 1mo ago), licensed MIT. It adds 19 tokens to every session and 1,292 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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