What is chapter-split?

A book-chapter preparation tool that divides the original text into smaller reading units and creates note templates for each one.

It helps split chapters, create nine-part notes, add a chapter introduction, and update the reading progress file.

It makes a long chapter easier to read and keeps progress organized at both chapter and unit levels.

How plustar35/echo-reading configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to plustar35/echo-reading. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/plustar35/echo-reading/main/.claude/skills/chapter-split/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/plustar35/echo-reading

Made for: Claude Code.

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/plustar35/echo-reading/chapter-split/github.svg)](https://agentmods.dev/skills/plustar35/echo-reading/chapter-split)

Your own site

<a href="https://agentmods.dev/skills/plustar35/echo-reading/chapter-split"><img src="https://agentmods.dev/badge/skills/plustar35/echo-reading/chapter-split/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/plustar35/echo-reading/chapter-split"><img src="https://agentmods.dev/badge/skills/plustar35/echo-reading/chapter-split.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 145 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,710 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 unknown 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	$0.00145	$0.01710
Opus 5.5	$0.00058	$0.00684
Sonnet 5.5	$0.00029	$0.00342
Haiku 4.5	$0.00015	$0.00171

Measured 2mo ago against content hash f12fbd4f923d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

chapter-split 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 2mo ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/extract_source.py, scripts/write_units.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.claude/skills/chapter-split/SKILL.md · 76 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

5 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.

2mo ago First seen · 76 lines · 145 tokens per session scan A f12fbd4f923d

Subscribe to this mod's changes

chapter-split is a skill published in the GitHub repository plustar35/echo-reading (143 stars, last pushed 4mo ago), with no licence file. It adds 145 tokens to every session and 1,710 once invoked, about $0.0006 per session on Opus 5.5. 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.

Learning and teaching Writing and docs

chapter-split next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
chapter-splitplustar35/echo-reading	Skill	143	4mo ago	none	A	145	Claude Code
hr-onboardingnexu-io/open-design	Skill	106k	today	Apache-2.0	A	62	Claude Code, Codex
book-mirrorgarrytan/gbrain	Skill	32k	today	MIT	A	138	Claude Code
exam-forecastanthropics/claude-for-legal	Skill	9.9k	today	Apache-2.0	A	73	Claude Code
lean-formalizewanshuiyin/Auto-claude-code-research-in-sleep	Skill	19k	yesterday	MIT	A	81	Claude Code
deck-course-modulenexu-io/html-anything	Skill	9.4k	yesterday	Apache-2.0	A	25	Claude Code, Codex
eli5companion-inc/feynman	Skill	10k	7d ago	MIT	A	63	Claude Code, Codex

echo-reading: Skill for Claude Code