What is chapter-writing?

A writing workflow for drafting fiction chapters. It first gathers the story's existing details and creates a chapter outline before writing the prose, then updates related story records.

Use it to plan or write a chapter, scene, or continuation of an existing story project, including updates to the chapter index and timeline.

It helps prevent contradictions in characters, setting, plot order, and tone as a story grows. The outline gives the writer a chance to agree on the chapter's direction before the full draft is produced.

chapter-writing — Skill for Claude Code and Codex by bs779517

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 bs779517/story-skills --skill chapter-writing

Clone the repo

git clone --depth 1 https://github.com/bs779517/story-skills

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/bs779517/story-skills/chapter-writing/github.svg)](https://agentmods.dev/skills/bs779517/story-skills/chapter-writing)

Your own site

<a href="https://agentmods.dev/skills/bs779517/story-skills/chapter-writing"><img src="https://agentmods.dev/badge/skills/bs779517/story-skills/chapter-writing/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/bs779517/story-skills/chapter-writing"><img src="https://agentmods.dev/badge/skills/bs779517/story-skills/chapter-writing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 55 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 859 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.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00055	$0.00859
Opus 5	$0.00028	$0.00430
Sonnet 5	$0.00011	$0.00172
Haiku 4.5	$0.00006	$0.00086

Measured 11d ago against content hash c81a6ae41802, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

chapter-writing 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.

skills/chapter-writing/SKILL.md · 97 lines

How it starts

The opening of the file, as written. The whole thing — 97 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Chapter Writing

Overview

Write story chapters using an outline-first workflow. Gathers context from all other story elements (characters, world, plot) to maintain consistency, builds a beat-by-beat outline for approval, then writes full prose. After writing, updates all cross-references (chapter index, timeline, foreshadowing).

Prerequisites

A story project must already exist with at least:

story.md (story bible)
At least one character in characters/
A plot structure in plot/_index.md (recommended but not required for first chapters)

Outline-First Workflow

1. Gather Context

Read these files to understand the current story state:

story.md - genre, themes, POV, tense
chapters/_index.md - what's been written, current word count
plot/_index.md - arc status, what needs to happen next
plot/timeline.md - chronological position

If this isn't the first chapter, also read:

The previous chapter file - for continuity (ending state, cliffhangers, emotional tone)
Active arc files in plot/arcs/ - for upcoming plot beats

2. Determine Chapter Scope

Ask the user:

What should this chapter cover? (or suggest based on plot arcs)
Whose POV?
Which location(s)?

If plot arcs exist, suggest the next logical beats to advance.

3. Build the Outline

Create a beat-by-beat outline listing:

Each scene/beat and what it accomplishes
POV character and location for each beat
Which arc plot points are advanced
Any foreshadowing to plant or pay off

Load the POV character's file for voice reference. Load relevant location files for setting details.

Present the outline to the user for approval. Revise until approved.

4. Write the Chapter

With the approved outline, write the full prose:

Follow the POV and tense from story.md
Use the POV character's voice and speech patterns from their profile
Ground scenes in location details from worldbuilding files
Consult references/writing-guidelines.md for prose craft guidance
Use the chapter template from references/chapter-template.md
Include the approved outline in the file above the prose (for reference)

Read the full file on GitHub · 97 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

11d ago First seen · 97 lines · 55 tokens per session scan A c81a6ae41802

Subscribe to this mod's changes

chapter-writing is a skill published in the GitHub repository bs779517/story-skills (8 stars, last pushed today), licensed MIT. It adds 55 tokens to every session and 859 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 2026-08-31.

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