book-fiction

book-fiction is a skill for Claude Code from epicsagas/Velith. It costs 57 tokens per session (1,866 once invoked), scanned A, original, Apache-2.0.

A set of established methods for planning fictional stories, characters, scenes, subplots, and chapter endings.

In plain words
What is it for?
It is for using the Save the Cat 15-beat structure, Snowflake Method, Hero's Journey, scene patterns, character bibles, hooks, and subplot types.
Why use it?
It gives a writer structures for building a complete story and tracking how characters and plot lines develop.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the velith plugin — 18 skills, 12 agents shipped together

Good fit It is for using the Save the Cat 15-beat structure, Snowflake Method, Hero's Journey, scene patterns, character bibles, hooks, and subplot types.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/epicsagas/velith/book-fiction
Install

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.

Any agent
npx skills add epicsagas/Velith --skill book-fiction
Clone the repo
git clone --depth 1 https://github.com/epicsagas/Velith

Made for: Claude Code.

Or install velith, the plugin that ships this one along with the rest of its 18 skills, 12 agents.

Wrote 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.

agentmods badge for book-fiction

README.md
[![agentmods](https://agentmods.dev/badge/skills/epicsagas/velith/book-fiction/github.svg)](https://agentmods.dev/skills/epicsagas/velith/book-fiction)
Your own site
<a href="https://agentmods.dev/skills/epicsagas/velith/book-fiction"><img src="https://agentmods.dev/badge/skills/epicsagas/velith/book-fiction/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.

agentmods 80×15 button for book-fiction

Your own site · 80×15
<a href="https://agentmods.dev/skills/epicsagas/velith/book-fiction"><img src="https://agentmods.dev/badge/skills/epicsagas/velith/book-fiction.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,866 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00057 $0.01866
Opus 5 $0.00028 $0.00933
Sonnet 5 $0.00011 $0.00373
Haiku 4.5 $0.00006 $0.00187

Measured 4d ago against content hash 6094ce1e0597, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

book-fiction 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 4d 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.

skills/book-fiction/SKILL.md · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fiction

The reader of a novel is not looking for a well-structured story. They are looking for the experience of being inside someone else's consequential life. Structure is how you keep them there. This file is craft, not a template.

Structure: choose, do not apply

Pick the shape that fits the premise and say why in outline.md. Options:

  • Three-act (setup 25% / confrontation 50% / resolution 25%). Midpoint reversal. Works for almost everything; risk is a flat second act.
  • Save the Cat 15-beat (Opening Image → Theme Stated → Setup → Catalyst 10% → Debate → Break into Two 20% → B Story → Fun and Games → Midpoint 50% → Bad Guys Close In → All Is Lost 75% → Dark Night → Break into Three 80% → Finale → Final Image). Best for commercial genre fiction. Risk: fifteen equal-sized chapters that feel engineered.
  • Hero's Journey (12 stages). Best for quest and coming-of-age. Risk: mentor and threshold scenes that feel obligatory.
  • Story Grid / five commandments per scene (inciting incident, progressive complication, crisis, climax, resolution) applied at scene, sequence, act, and global level. Best for making every unit turn.
  • Snowflake for planning: one sentence → paragraph → character summaries → expand. A planning method, not a book shape.
  • Bespoke: braided timelines, epistolary, nested frames, reverse chronology. Only when the premise demands it and the author agrees.

Whatever the shape: the inciting incident is inside the first 10-12% or the reader leaves; the midpoint changes what the protagonist wants or believes, not just what happens; the ending is caused by a choice the protagonist could only make after everything that came before.

Subplots carry theme or contrast. Each needs its own small arc and must converge with the main line by the third act or be cut.

POV plan in the outline: whose head, what distance, which chapters. Do not change the plan mid-draft without updating the bible.

Scene design

A scene is a unit where something changes. If nothing changes, it is not a scene; cut it or merge it.

Read the full file on GitHub · 103 lines

Changes

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.

  1. 4d ago Changed · +82 lines · +26 tokens per session 6094ce1e0597
  2. 10d ago First seen · 21 lines · 31 tokens per session scan A 484a64d6b3f1

Subscribe to this mod's changes

book-fiction is a skill published in the GitHub repository epicsagas/Velith (34 stars, last pushed 4d ago), licensed Apache-2.0. It adds 57 tokens to every session and 1,866 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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