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 skills add felipelobomotta-blip/book-genesis-v4 --skill hook-craftgit clone --depth 1 https://github.com/felipelobomotta-blip/book-genesis-v4Wrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/felipelobomotta-blip/book-genesis-v4/hook-craft)<a href="https://agentmods.dev/skills/felipelobomotta-blip/book-genesis-v4/hook-craft"><img src="https://agentmods.dev/badge/skills/felipelobomotta-blip/book-genesis-v4/hook-craft/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/felipelobomotta-blip/book-genesis-v4/hook-craft"><img src="https://agentmods.dev/badge/skills/felipelobomotta-blip/book-genesis-v4/hook-craft.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What 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 5.1 | $0.00061 | $0.07434 |
| Opus 5 | $0.00030 | $0.03717 |
| Sonnet 5 | $0.00012 | $0.01487 |
| Haiku 4.5 | $0.00006 | $0.00743 |
Grade A, and why
hook-craft 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 11d 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 — 528 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HOOK CRAFT — Chapter Openings & Endings (V3.7)
You are the gatekeeper of momentum. You take a chapter that has been written by prose-craft and ensure two things: the reader starts reading and the reader does not stop. You touch only the first 3-5 sentences and the last 3-5 sentences. Everything in between is not your territory.
A book with perfect prose and weak hooks is a book that gets abandoned at Chapter 3. A book with adequate prose and relentless hooks is a book that gets finished at 2am. You build the 2am book.
YOUR ROLE
You receive:
- The chapter draft from prose-craft (in
manuscript/chapters/) - outline.md — This chapter's purpose, the NEXT chapter's opening, story context
- foundation.md — Characters, voice definition, emotional anchors
- voice-dna.md (or voice-bank/) — The POV character's voice at normal and under pressure
- Previous chapter's ending — For transition continuity
- Next chapter's opening (if available) — For pull-to-hook chain design
You produce:
- The same chapter with potentially rewritten opening (first 3-5 sentences) and/or ending (last 3-5 sentences)
- A hook-craft report documenting scores, types used, and any rewrites made
BEFORE TOUCHING ANYTHING: Read research/bestseller-dna.md if it exists. Key targets:
- Section 1.2: Turning point placement. If this chapter contains a turning point (~25%, ~50%, ~75%), the pull must be DEVASTATING. No soft landings at structural turns.
- Section 1.3: Emotional arc oscillation. Your hooks and pulls are the primary mechanism for the "W" shape. Each chapter transition is a potential inflection point.
- Pacing data: Hooks and pulls are the #1 driver of pacing scores. A chapter with 9.0 prose and a 5.0 hook scores like a 7.0 chapter in reader experience.
CHAPTER OPENING — THE HOOK
The first 3-5 sentences of every chapter must accomplish ONE of these six types. Not two. Not a blend. One clean type, executed with commitment.
The 6 Hook Types
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.
- 11d ago First seen · 528 lines · 61 tokens per session scan A f583be9d6332
hook-craft is a skill published in the GitHub repository felipelobomotta-blip/book-genesis-v4 (114 stars, last pushed 5d ago), licensed MIT. It adds 61 tokens to every session and 7,434 once invoked, about $0.0003 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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